Merge remote-tracking branch 'origin/master' into codex/fs-directory-listing

# Conflicts:
#	docs/rfc/README.md
#	packages/fs/fs-local/src/index.ts

.agents/skills/dsh-code-review/SKILL.md

@@ -34,7 +34,7 @@ These come straight from the source docs above. They are not discretionary; abse
 1. **Docs in sync.** If the PR changes a config key, default, error code, wire field, or event name, it must update the package README + module/JSDoc in the same diff. The `doc-sync` gate (check #4) does not catch prose drift in config keys, defaults, error codes, or wire fields — that is on the reviewer, but it is still required, not optional.
 2. **Core-data-structures catalog in sync.** If the PR adds, removes, or reshapes a type the [core-data-structures catalog](../../../docs/core-data-structures/core.md) documents — a new `…Map` variant, a new content-block/session-event type, a field on `GenerateOptions`/`Agent`/`ToolDefinition`/a bash type, or a whole new core/seam type — it must update that catalog in the same diff (prose + any verbatim ` ```ts type-equiv ` block + the 1:1 `scripts/type-equiv.manifest.json`). The `verify-type-equiv` gate (part of `doc-sync`) catches a *drifted paste* of an already-documented type, but it cannot tell you a brand-new core type went undocumented — that judgment is yours. Confirm a genuinely spine-level type landed in core.md and a new capability's vocabulary on a sub-page, per the spine-vs-seam line in [core.md § What counts as "core"](../../../docs/core-data-structures/core.md#what-counts-as-core). A pure internal type with no cross-package reach needs no catalog entry — say so if it's a judgment call.
 3. **HMR-safety test.** Any new registry/registration needs a test that disposes the contributing fiber and asserts cleanup (packages/AGENTS.md). Its absence blocks merge.
-4. **Quality gates pass.** typecheck, lint, test, test:coverage (100% per-file on `packages/*/src`), knip, build, publint, constraints, `doc-sync` (doc-typecheck + verify-cordis-catalog + verify-md-wrap + verify-md-links + verify-type-equiv), module-graph freshness (the quality-gates RFC). Don't re-review what a gate already enforces — trust the gate and spend attention on what it can't check. Note that the `doc-sync` gate only covers compilable `ts` blocks, the generated cordis events/services catalog, markdown wrapping/links, and verbatim type-equiv blocks; prose drift (checks #1 and #2) is *additional* manual review on top of it, not covered by it.
+4. **Quality gates pass.** typecheck, lint, test, test:coverage (100% per-file on `packages/*/src`), knip, build, publint, constraints, `doc-sync` (doc-typecheck + verify-cordis-catalog + verify-tool-catalog + verify-md-wrap + verify-md-links + verify-doc-refs + verify-package-paths + verify-rfc-classification + verify-type-equiv + verify-translation-pairing), module-graph freshness (the quality-gates RFC). Don't re-review what a gate already enforces — trust the gate and spend attention on what it can't check. Note that the `doc-sync` gate only covers compilable `ts` blocks, the generated cordis events/services catalog, markdown wrapping/links, verbatim type-equiv blocks, and the bilingual pairing contract ([docs/i18n/README.md](../../../docs/i18n/README.md)); prose drift (checks #1 and #2) and translation *quality* (the [dsh-translate-docs](../dsh-translate-docs/SKILL.md) rules) are *additional* manual review on top of it, not covered by it.
 
 ## Reviewer-only checks (gates can't catch these — judgment required)
 

.agents/skills/dsh-translate-docs/SKILL.md

@@ -0,0 +1,56 @@
+---
+name: dsh-translate-docs
+description: Use when creating or updating the bilingual counterpart of a doc in this repo (English ↔ Chinese pairs) — orients the translator to the pairing contract, the terminology source of truth, the translation rules, and the consistency gate that verifies the result
+---
+
+# Translating DeepSeek-Harness docs
+
+**This skill is guidance, not a translation memory.** It is the workflow map for keeping `foo.md ↔ foo.zh.md` pairs consistent and natural in both languages. Both languages carry equal authority — a change is authored in either one, and that side is the source for that update. You are the translator: the rules below say what must hold, not how to phrase any particular sentence — phrasing judgment is yours, terminology is not.
+
+## Sources of truth (read, don't re-summarize)
+
+These are authoritative; read them at the source so this skill never drifts out of sync.
+
+- **[docs/i18n/README.md](../../../docs/i18n/README.md)** — the pairing contract: the three-file pair (`foo.md`, `foo.zh.md`, `foo.i18n.yaml`), the consistency record's both-side blob hashes, the language-switcher lines, scope/exclusions, and the rollout manifest.
+- **[docs/i18n/translation-rules.md](../../../docs/i18n/translation-rules.md)** — how to translate: faithfulness, structure preservation, terminology discipline, typography (MUST/SHOULD levels).
+- **[docs/i18n/terminology.md](../../../docs/i18n/terminology.md)** — the terminology table, binding in both directions. Load it BEFORE translating, not when a term feels uncertain; the terms you don't notice are the ones that drift.
+
+## Find the work
+
+- `pnpm run verify-translation-pairing --list` prints every in-scope document as missing / out-of-sync / ok — the work list for a translation batch.
+- In a PR that edits paired docs, the work list is the diff itself: every changed side of a pair needs its counterpart updated and the pair re-recorded in the same PR, and the gate goes red if you forget.
+
+## Triage by change type
+
+Do not process every file the same way:
+
+- **New pair** (no counterpart yet): whichever language exists — English or Chinese — translate the whole file into the other, section by section for long documents, keeping each section's structure locked to the source as you go rather than fixing structure at the end.
+- **Update** (pair exists, one side edited): do NOT re-translate. The consistency record names the exact last-confirmed text of both sides — recover the edited side's previous state and diff:
+
+  ```sh
+  git cat-file -p <hash-from-i18n-yaml> > /tmp/last-confirmed.md
+  git diff --no-index /tmp/last-confirmed.md docs/foo.md
+  ```
+
+  Apply the smallest counterpart edits that cover that diff. A minimal update preserves the reviewed phrasing of everything that didn't change; a re-translation throws that review away.
+- **Deleted or renamed doc**: delete or rename the counterpart and the `.i18n.yaml` alongside it — the gate reports an incomplete pair otherwise.
+
+## Translate
+
+- Work through the document applying [translation-rules.md](../../../docs/i18n/translation-rules.md). Internally: first render faithfully, then re-read the counterpart alone for awkward or ambiguous phrasing, then polish — but write ONLY the final text to the file, never drafts or notes.
+- Every term in [terminology.md](../../../docs/i18n/terminology.md) renders exactly as specified, in both directions, including first-occurrence annotations. A term the table misses: translate only with a citable precedent from a major Chinese OSS/vendor doc; otherwise keep the English and add it to the PR's 「待定术语」 list with your suggested rendering. Never invent a rendering inline — that decision belongs to a human and then to the table.
+- Code blocks are byte-identical across the pair, comments included. Relative links keep their `.md` targets; only the switcher line links `.zh.md`.
+
+## Finish the pair
+
+1. Switcher: `[English](foo.md) | 中文` immediately after the Chinese file's H1, `English | [中文](foo.zh.md)` after the English file's H1 — add both if this is a new pair.
+2. Record consistency: `pnpm run verify-translation-pairing --write` recomputes and records both sides' full blob hashes in `foo.i18n.yaml`. The yaml diff in your PR is the reviewable statement "I confirmed these two say the same thing" — only run it after you actually have.
+3. New batch landed? Add the `.md` paths to `required` in [scripts/translation-pairing.manifest.json](../../../scripts/translation-pairing.manifest.json) so the gate ratchets forward.
+
+## Verify — the gate, not your eyes
+
+Run `pnpm run verify-translation-pairing`, then the rest of the Markdown gates (`pnpm run verify-md-wrap && pnpm run verify-md-links`, or full `pnpm run doc-sync` before the PR). Fix what they report; do not hand-check what they cover. What they can NOT check — whether the two sides truly say the same thing, terminology judgment calls, tone — is exactly what the PR reviewer will read for, so keep the PR reviewable: state which pairs are new vs minimally updated, and list 「待定术语」 prominently.
+
+## How to respond to translation review
+
+Same discipline as any review in this repo (see [dsh-code-review](../dsh-code-review/SKILL.md) § How to respond): evaluate each comment on its merits, and for terminology comments, remember the table is the contract — a reviewer's rendering decision gets applied to [terminology.md](../../../docs/i18n/terminology.md) so it binds every future translation, not just patched into one file.

AGENTS.md

@@ -177,9 +177,15 @@ pnpm run verify-package-paths  # assert every packages/<path> cited in Markdown
 pnpm run verify-rfc-classification  # assert every RFC lives in a valid
                     # {lifecycle}/{class}/ folder and docs/rfc/README.md lists it
                     # under the matching heading (closed class set + index completeness)
+pnpm run verify-translation-pairing  # assert the bilingual pairing contract
+                    # (docs/i18n/README.md): required docs have a complete pair
+                    # (foo.md + foo.zh.md + foo.i18n.yaml); every pair matches its
+                    # recorded consistency hashes, is switcher-linked, and
+                    # structure-matched. `--list` prints the work list; `--write`
+                    # re-records a pair after you bring both sides in line
 pnpm run verify-node-next-types  # assert built declarations typecheck for a
                     # standard external NodeNext ESM TypeScript consumer
-pnpm run doc-sync       # doc-typecheck + verify-cordis-catalog + verify-md-wrap + verify-md-links + verify-doc-refs + verify-package-paths + verify-rfc-classification + verify-type-equiv (CI runs this)
+pnpm run doc-sync       # doc-typecheck + verify-cordis-catalog + verify-tool-catalog + verify-md-wrap + verify-md-links + verify-doc-refs + verify-package-paths + verify-rfc-classification + verify-type-equiv + verify-translation-pairing (CI runs this)
 pnpm run demo:echo      # run examples/echo-agent (no API key; type "echo hi" to
                     # see a tool call) — the mock skeleton
 pnpm run demo:coding    # run examples/coding-agent — the real agent (needs
@@ -250,7 +256,7 @@ Dev/test/demo run **unbuilt** via tsx + the source `paths` map in the root `tsco
 - **Tests**: vitest, colocated under `packages/<group>/<pkg>/tests/*.spec.ts`. Every registry needs an HMR-safety test (dispose the contributing fiber, assert cleanup). **Excessive tests are welcome** — when in doubt, write the test; err on the side of covering edge cases, error paths, event ordering, and concurrency races even if they seem unlikely. Review findings get regression tests (see `packages/core/agent-loop/tests/review-fixes.spec.ts`). The same generosity applies to **real-API (with-key) e2e tests — inference is cheap here (we are DeepSeek), so do not ration them**: cover the agent's real flows (a real prompt that writes a file, multi-turn, tool use, cancellation) and run them frequently while developing, especially cheap **smoke tests** that boot the real example and check the world. A green mock/no-key suite proves the plumbing, not the product — the with-key smoke test is what catches "green units, broken product". See § Secrets / .env for the with-key policy and why self-skip is a CI accommodation, not a verdict that real-API tests are expensive.
 - **Prefer the REAL implementation over a mock/stand-in in tests.** When the genuine collaborator is available in the repo, wire it up instead of hand-rolling a fake — a test that registers an inline `defineTool({ name: 'bash', … })` to stand in for `dsh-tool-bash` proves the *bridge* moves bytes but not that the *shipping tool* renders the way the test asserts; the two drift and the test passes while the product is wrong. Mock only the genuinely expensive/non-deterministic boundary (the LLM adapter, the network, the clock) and keep everything downstream real: a bridge tool-call test runs the scripted mock MODEL but the REAL tool + REAL executor (e.g. `makeBridgeHarness({ withBash: true })` plugs `dsh-bash-local` + `dsh-tool-bash` and runs an actual `echo`), so it verifies the actual `presentCall`/`presentResult` an editor sees. This is the unit-test echo of "verify the world, not a synthetic stand-in" (see § Defensive patterns) — a fake you wrote will agree with whatever you assumed; the real thing won't.
 - **A change that affects the editor-facing transcript or end-to-end agent UX needs a snapshot test (or an explicit note in the PR why none applies).** The snapshot tier (`examples/*/tests/**/*.snapshot.ts`, `pnpm run test:snapshot`) boots the real example subprocess, replays a recorded session JSONL deterministically (keyless), and diffs the normalized stdout transcript + re-persisted session log against committed goldens — the full-transcript regression net that mock-level unit tests structurally cannot be (it is what catches a bridge-translation or loop-structure regression that leaves every unit green). When you change the ACP bridge, the agent loop's observable output, tool presentation, or anything an editor renders, add or update a scenario under `examples/acp-agent/tests/snapshots/` and re-record with `pnpm run test:snapshot:record`. Reviewing the golden diff is part of the review. The rule is scoped to transcript/UX-affecting changes — a pure internal refactor with no observable-output change does not need one, but say so. See [docs/rfc/implemented/testing/2026-06-19-acp-snapshot-tests.md](docs/rfc/implemented/testing/2026-06-19-acp-snapshot-tests.md).
-- **Designing a new subsystem includes designing its test infrastructure — END TO END, up front, as part of the same plan.** When you introduce a new capability seam, a new agent-lifecycle shape, or anything that produces an observable transcript (a new tool family, a subagent transport, a new UI surface), the plan must name how it will be covered at EVERY tier it touches — unit, real-API e2e, AND the full-transcript snapshot tier — and, critically, must check that the existing test infrastructure can actually express that coverage. Do not assume a snapshot/e2e harness built for one shape (e.g. a single top-level ACP session) transparently supports a new shape (e.g. a parent agent driving nested child agents): verify it, and if it cannot, the harness extension is in-scope work to plan and schedule, not a detail to discover mid-implementation. This rule exists because a real plan under-scoped exactly this: the subagent backends were planned with unit + e2e coverage but the snapshot tier turned out to assume one session per process (`dsh-llm-replay`'s single positional cursor, single-file harvest), so nested-agent snapshot coverage became unplanned net-new infrastructure (`TODO(subagent-snapshots)`). The cost of finding that during design is a paragraph; the cost of finding it mid-build is a re-plan. When the harness gap is large enough to be its own reviewable unit, schedule it as a dedicated stacked follow-up with its own RFC — but SAY SO in the originating plan, with the gap named, rather than letting it surface as a surprise.
+- **A tool's editor/ACP representation is part of its design — decide it up front, not after.** When you add or change a model-facing tool, its ACP tool-call card is as much a deliverable as its `execute`: decide which render intent it declares via `presentCall`/`presentResult` (`generic` — a titled card with `kind`/`rawInput`/`content`/`locations`; `terminal` — a shell command; `diff` — a file create/modify rendered as an inline diff), and cover it with a snapshot test (the transcript tier is the only place card rendering is actually verified end-to-end — a unit test on the pure presenter proves the shape, not that an editor renders it). A tool that reads/writes files should almost always emit `locations` (for editor follow-along) and, for a mutation, a `diff` card; a tool that runs a command is a `terminal`. The presentation methods are pure functions of `args` (they run on live streaming AND session-log replay), so they must not do I/O or read session state — the bridge, not the tool, relativizes display paths and fills the session cwd. The reference implementations are `dsh-tool-fs` (generic/diff) and `dsh-tool-bash` (terminal); the vocabulary and the why are pinned in [docs/rfc/implemented/architecture/2026-07-02-tool-render-intent-union.md](docs/rfc/implemented/architecture/2026-07-02-tool-render-intent-union.md), and the step-by-step is in [docs/cookbook/adding-a-tool.md](docs/cookbook/adding-a-tool.md). When you introduce a new capability seam, a new agent-lifecycle shape, or anything that produces an observable transcript (a new tool family, a subagent transport, a new UI surface), the plan must name how it will be covered at EVERY tier it touches — unit, real-API e2e, AND the full-transcript snapshot tier — and, critically, must check that the existing test infrastructure can actually express that coverage. Do not assume a snapshot/e2e harness built for one shape (e.g. a single top-level ACP session) transparently supports a new shape (e.g. a parent agent driving nested child agents): verify it, and if it cannot, the harness extension is in-scope work to plan and schedule, not a detail to discover mid-implementation. This rule exists because a real plan under-scoped exactly this: the subagent backends were planned with unit + e2e coverage but the snapshot tier turned out to assume one session per process (`dsh-llm-replay`'s single positional cursor, single-file harvest), so nested-agent snapshot coverage became unplanned net-new infrastructure (`TODO(subagent-snapshots)`). The cost of finding that during design is a paragraph; the cost of finding it mid-build is a re-plan. When the harness gap is large enough to be its own reviewable unit, schedule it as a dedicated stacked follow-up with its own RFC — but SAY SO in the originating plan, with the gap named, rather than letting it surface as a surprise.
 
 ## Defensive patterns (hard-won)
 
@@ -276,7 +282,7 @@ This codebase aims to be **very type-safe and well documented** for maintainabil
 
 In the **core** packages (`packages/llm/llm`, `packages/core/tools`, `packages/core/agent`, `packages/core/agent-loop`, `packages/core/session`, `packages/core/system-prompt`), **type gymnastics are acceptable when they improve the DX of plugin authors** for common plugin types. The `defineTool` typed schema DSL in `dsh-tools` is the canonical example: the `SchemaSpec` to `InferArgs<S>` type-level mapping gives tool authors zero-cast typed `execute` args, and the cost of the conditional types stays inside the core package.
 
-Verbose documentation is fine **as long as docs and code stay strictly in sync**. Out-of-sync docs are worse than no docs. **When you change code, update its docs in the SAME change** — grep the package README and the module/JSDoc comments for the old behavior (config keys, defaults, error codes, wire field names, event names) and fix every hit. CI runs `pnpm run doc-sync` (`doc-typecheck` + `verify-cordis-catalog` + `verify-md-wrap` + `verify-md-links` + `verify-doc-refs` + `verify-package-paths` + `verify-rfc-classification` + `verify-type-equiv`), which typechecks every fenced `ts` block in `README.md`, `docs/**/*.md`, and `packages/*/*.md`, regenerates the cordis events/services catalog from source and fails if the committed copy is stale, asserts no hard-wrapped prose paragraphs, checks that every relative Markdown cross-link resolves, checks that every `docs/*.md` path cited in a source comment resolves, checks that every `packages/<path>` reference naming a real package resolves, checks that every RFC is filed under a valid class folder and listed in its index, and checks that every ` ```ts type-equiv ` doc block still matches its source type — across those files plus `AGENTS.md` / `packages/AGENTS.md` — but that scope does NOT catch prose drift in `AGENTS.md` / `packages/AGENTS.md` / `packages/README.md` (config keys, defaults, error codes), so keeping those in sync remains on the author. Every module has a module-level doc comment explaining its role. Every exported class, interface, type, function, and non-obvious method has a JSDoc that explains semantics (not just the name) — contracts (what events fire when), disposal behavior, error behavior, and extension intent. Internal helpers get docs only where non-obvious. Prefer one-liners when one line suffices.
+Verbose documentation is fine **as long as docs and code stay strictly in sync**. Out-of-sync docs are worse than no docs. **When you change code, update its docs in the SAME change** — grep the package README and the module/JSDoc comments for the old behavior (config keys, defaults, error codes, wire field names, event names) and fix every hit. CI runs `pnpm run doc-sync` (`doc-typecheck` + `verify-cordis-catalog` + `verify-tool-catalog` + `verify-md-wrap` + `verify-md-links` + `verify-doc-refs` + `verify-package-paths` + `verify-rfc-classification` + `verify-type-equiv` + `verify-translation-pairing`), which typechecks every fenced `ts` block in `README.md`, `docs/**/*.md`, and `packages/*/*.md`, regenerates the cordis events/services catalog from source and fails if the committed copy is stale, asserts no hard-wrapped prose paragraphs, checks that every relative Markdown cross-link resolves, checks that every `docs/*.md` path cited in a source comment resolves, checks that every `packages/<path>` reference naming a real package resolves, checks that every RFC is filed under a valid class folder and listed in its index, checks that every ` ```ts type-equiv ` doc block still matches its source type, and checks the bilingual pairing contract (required docs have a complete, consistency-recorded EN/ZH pair — see [docs/i18n/README.md](docs/i18n/README.md)) — across those files plus `AGENTS.md` / `packages/AGENTS.md` — but that scope does NOT catch prose drift in `AGENTS.md` / `packages/AGENTS.md` / `packages/README.md` (config keys, defaults, error codes), so keeping those in sync remains on the author. The same-change rule extends to translations: **editing either side of a paired doc means updating the counterpart and re-recording the pair in the SAME change** (run the [dsh-translate-docs](.agents/skills/dsh-translate-docs/SKILL.md) skill, then `pnpm run verify-translation-pairing --write`); the pairing gate goes red otherwise. Every module has a module-level doc comment explaining its role. Every exported class, interface, type, function, and non-obvious method has a JSDoc that explains semantics (not just the name) — contracts (what events fire when), disposal behavior, error behavior, and extension intent. Internal helpers get docs only where non-obvious. Prefer one-liners when one line suffices.
 
 **Tag every new event with `@mode`.** The cordis events/services catalog ([docs/cordis-catalog/events-and-services.md](docs/cordis-catalog/events-and-services.md)) is GENERATED from source by `scripts/gen-cordis-catalog.ts` — never hand-edit it; run `pnpm run gen-cordis-catalog` and commit the result. When you add an event to an `interface Events` block, its JSDoc MUST carry a `@mode emit|waterfall|parallel|serial` tag (the generator hard-errors without it): use `waterfall` when the signature ends with a `next: () => …` parameter (the listener transforms or vetoes via `next()`), `parallel` when the loop awaits a fan-out and must run every listener (e.g. an awaited `Promise<void> | void` checkpoint like `session/flush`), `serial` when the loop awaits listeners in registration order and should isolate side effects (e.g. an ordered surface-mutation checkpoint like `agent/pre-step`; Cordis stops early if a listener returns a bail value, so `void` serial listeners must not return a semantic veto), and `emit` for plain fire-and-forget notifications. The generator also cross-checks the tag against the signature where the shape is conclusive (a trailing `next` ⇒ waterfall) and hard-errors on a contradiction. Write the rest of the event's JSDoc to stand alone — it is the catalog entry's prose.
 

README.i18n.yaml

@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write
+README.md: 33c03fad1450d91ba1adef3d89ce44d0ff73c25b
+README.zh.md: 9d520023c528810ce75ee80efec2f2f087fb7b0e

README.md

@@ -1,5 +1,7 @@
 # DeepSeek Harness
 
+English | [中文](README.zh.md)
+
 Monorepo for the DeepSeek Harness group.
 
 ## Projects

README.zh.md

@@ -0,0 +1,24 @@
+# DeepSeek Harness
+
+[English](README.md) | 中文
+
+DeepSeek Harness 小组的 monorepo。
+
+## 项目
+
+- **DeepSeek Code** — DeepSeek 的编码 agent（智能体）产品。
+
+## 开发
+
+本 monorepo 基于 [Cordis](https://github.com/cordiverse/cordis) 框架构建（以源码形式收录在 `vendor/` 下），采用微内核风格：一切皆插件。
+
+```sh
+pnpm install
+pnpm run test          # vitest
+pnpm run demo:echo     # runnable echo-agent example (no API key needed)
+pnpm run demo:coding   # the real DeepSeek coding agent (needs DEEPSEEK_API_KEY)
+```
+
+面向人类读者：先读[开发指南](docs/development.md)了解本地环境搭建、钩子、环境变量与质量门禁，动手改 package 之前再读[架构设计](docs/architecture.md)。局部上下文见 [packages/](packages/) 与 [vendor/](vendor/)。
+
+面向 agent：遵循 [AGENTS.md](AGENTS.md)。

docs/cookbook/adding-a-tool.md

@@ -36,6 +36,7 @@ Registration is effect-based: disposing the plugin fiber unregisters the tool (w
 - **Args are validated for you.** `defineTool` validates the model-generated `arguments` against the `SchemaSpec` before `execute` runs (type, required keys, enum membership, nested objects/arrays — [runtime arg validation](../rfc/implemented/architecture/2026-06-11-runtime-arg-validation.md)), so inside `execute` the args already match `InferArgs`. You still hand-check value constraints the DSL can't express (non-empty strings, positive numbers, cross-field rules); throw a descriptive Error for those. Raw JSON-Schema tools registered directly (MCP) are NOT validated by the harness — they validate their own input.
 - **Throwing means isError.** The registry catches anything `execute()` throws and returns `{isError: true}` to the model. Use that for infrastructure failures (bad input, spawn errors, aborts) — but REPORT domain failures in the result text instead (e.g. tool-bash returns `[exit code: 9]` with `isError: false`: the model decides what a failing command means).
 - **Honor `exec.signal`.** Cancel in-flight work when it fires.
+- **Attach durable card data with `meta` (optional).** `execute` may return `{ content, meta }` instead of a bare `ContentBlock[]` — `meta` is a JSON-serializable payload the core treats as opaque, persisted on the `tool/result` event and handed back to your `presentResult` (so a card that needs more than `args`, like `write`/`edit`'s applied-hunk diff, survives a session replay). Keep UI-only data here, never in the model-facing `content`.
 - **Use `exec.agent` for async notifications.** `agent.inject(content, {source: {kind: 'plugin', plugin: '<name>'}})` appends durable context the NEXT model request sees — it is not a wake-up (an idle agent stays idle). Guard against disposed agents (try/catch).
 
 ## Long-running work
@@ -48,6 +49,26 @@ Follow tool-bash's background pattern: a `run_in_background` flag returns a task
 
 Prefer not to build policy into the tool. The seam is the `tools/execute` waterfall (veto or wrap — see the permission-gate example in [extension-cookbook.md](./extension-cookbook.md)), or a sandboxing implementation behind the tool's executor seam.
 
+## How your tool renders in an editor (ACP presentation)
+
+Your tool's `execute` returns model-facing content; its **editor card** is a separate, optional concern you declare with two pure display methods on the `defineTool` options. Design this alongside `execute`, not after — an editor (Zed, over the ACP bridge) shows the card, and a tool with no presentation falls back to a bland generic card (title = tool name, raw args as input).
+
+Both methods return a **`card`-tagged render intent** — pick the card kind that matches what your tool does:
+
+- `presentCall(args)` → a `ToolCallView` (the PENDING card):
+  - `{ card: 'generic', title, kind?, rawInput?, content?, locations? }` — the default. Set `kind` for an icon (`read`/`search`/…); set `locations: [{ path, line? }]` for any file your tool touches so a capable editor follows along / jumps to it.
+  - `{ card: 'terminal', title, description?, cwd? }` — your call IS a shell command. `title` is the command, `description` renders above the terminal card. (tool-bash.)
+  - `{ card: 'diff', title, diffs, locations? }` — your call creates or modifies a file. `diffs: [{ path, oldText, newText }]` (`oldText: null` for a new file) renders as an inline diff card. (tool-fs `write`/`edit`.)
+- `presentResult(args, { content, isError, meta? })` → a `ToolResultView` (the COMPLETED card): `{ card: 'generic', title?, content? }`, `{ card: 'terminal', title?, output?, exitCode?, signal? }` (the run's captured output + exit — the bridge shows an exit pill and derives a fenced ` ```console ` fallback for editors without the terminal capability), or `{ card: 'diff', title?, diffs }` (a completed file mutation — the applied hunks computed from the before/after content when there is a before-image, else a whole-file diff for a create; `write`/`edit` attach the hunks via the `meta` channel and read them back here). A mutation tool returns the `diff` result even when it duplicates the call-time card, because an ACP `tool_call_update.content` REPLACES the call's content — a non-diff result would clobber the pending diff. `result.meta` is your tool's own optional presentation payload, attached from `execute` (see below) and persisted so a replay reproduces the card.
+
+Hard rules (they bite if broken):
+
+- **Purity.** These run on live streaming AND on session-log REPLAY, so they must be pure functions of `args` (+ the result) — NO I/O, NO reading session state, NO clock/random. A diff is derived from the args (`write` uses `oldText: null` because a call-time presenter has no prior file content); the BRIDGE, not the tool, fills the session cwd and relativizes a display-path title. If you find yourself wanting the file's old content or the working directory inside `presentCall`, stop — that belongs on the bridge or a future result-event shape, not the presenter.
+- **UI-only formatting stays out of the model result.** A fenced ` ```console ` block, a diff, a relativized path — none of these may appear in what `execute` returns to the model; they live only in the presentation. (A `terminal` result view carries RAW `output`; the bridge adds the fences.)
+- **`defineTool` soft-validates the display path.** A malformed/older logged arg shape makes the wrapper return `undefined` (a generic fallback) rather than throw — display must never crash a replay.
+
+The neutral vocabulary lives in `dsh-tools` (never import an ACP type into a tool); the ACP bridge maps each `card` to the wire. The design and the why are in [the render-intent-union RFC](../rfc/implemented/architecture/2026-07-02-tool-render-intent-union.md); `dsh-tool-fs` (generic/diff) and `dsh-tool-bash` (terminal) are the reference implementations.
+
 ## Tests every tool needs
 
-Arg-validation rejections, result shaping for every outcome, the HMR disposal test, and — for tools with side effects — an integration spec that drives the tool through the agent loop with a scripted `MockAdapter` (`packages/core/agent-loop/tests/mock-adapter.ts`), asserting the `tool/call` / `tool/result` session events.
+Arg-validation rejections, result shaping for every outcome, the HMR disposal test, and — for tools with side effects — an integration spec that drives the tool through the agent loop with a scripted `MockAdapter` (`packages/core/agent-loop/tests/mock-adapter.ts`), asserting the `tool/call` / `tool/result` session events. **If your tool has an editor card, also add:** a unit test on `presentCall`/`presentResult` asserting the exact view shape, AND — because a unit test proves the shape but not that an editor renders it — a **snapshot scenario** under `examples/acp-agent/tests/snapshots/` that drives the real tool through the ACP bridge and pins the rendered `tool_call` transcript (the card kind is only verified end-to-end there; see the [ACP snapshot-tests RFC](../rfc/implemented/testing/2026-06-19-acp-snapshot-tests.md)). A tool whose card is a `terminal` needs a scenario whose `input.json` sets `terminalOutput: true` to exercise the capable-client `_meta` path.

docs/cordis-catalog/events-and-services.md

@@ -259,7 +259,7 @@ A session was created in the store.
 'session/created'(session: Session): void
 ```
 
-Source: [`packages/core/session/src/index.ts:34`](../../packages/core/session/src/index.ts)
+Source: [`packages/core/session/src/index.ts:35`](../../packages/core/session/src/index.ts)
 
 #### `session/event` — emit
 
@@ -271,7 +271,7 @@ An event was appended to a session log (sync, fire-and-forget). This is the per-
 
 Types: [SessionEvent](../core-data-structures/core.md)
 
-Source: [`packages/core/session/src/index.ts:40`](../../packages/core/session/src/index.ts)
+Source: [`packages/core/session/src/index.ts:41`](../../packages/core/session/src/index.ts)
 
 #### `session/flush` — parallel
 
@@ -281,7 +281,7 @@ Awaited durability checkpoint. The agent loop awaits `ctx.parallel('session/flus
 'session/flush'(session: Session): Promise<void> | void
 ```
 
-Source: [`packages/core/session/src/index.ts:49`](../../packages/core/session/src/index.ts)
+Source: [`packages/core/session/src/index.ts:50`](../../packages/core/session/src/index.ts)
 
 ### `subagent/*`
 
@@ -337,7 +337,7 @@ A tool was registered or unregistered (the available tool set changed).
 'tools/change'(): void
 ```
 
-Source: [`packages/core/tools/src/index.ts:48`](../../packages/core/tools/src/index.ts)
+Source: [`packages/core/tools/src/index.ts:66`](../../packages/core/tools/src/index.ts)
 
 #### `tools/execute` — waterfall
 
@@ -349,7 +349,7 @@ Waterfall around every tool execution — the single seam where sandbox, permiss
 
 Types: [ToolExecution](../core-data-structures/tools.md) · [ToolExecutionResult](../core-data-structures/tools.md)
 
-Source: [`packages/core/tools/src/index.ts:43`](../../packages/core/tools/src/index.ts)
+Source: [`packages/core/tools/src/index.ts:61`](../../packages/core/tools/src/index.ts)
 
 ### `web/*`
 
@@ -521,7 +521,7 @@ get(id: SessionId): Session | undefined
 list(): Session[]
 ```
 
-Source: [`packages/core/session/src/index.ts:322`](../../packages/core/session/src/index.ts)
+Source: [`packages/core/session/src/index.ts:323`](../../packages/core/session/src/index.ts)
 
 ### `ctx.subagents` — `SubagentService`
 
@@ -561,7 +561,7 @@ async execute(exec: ToolExecution): Promise<ToolExecutionResult>
 
 Types: [ToolDefinition](../core-data-structures/tools.md) · [ToolExecution](../core-data-structures/tools.md) · [ToolExecutionResult](../core-data-structures/tools.md)
 
-Source: [`packages/core/tools/src/index.ts:287`](../../packages/core/tools/src/index.ts)
+Source: [`packages/core/tools/src/index.ts:199`](../../packages/core/tools/src/index.ts)
 
 ### `ctx.web` — `WebService`
 

docs/core-data-structures/core.md

@@ -11,7 +11,7 @@ Precisely, a data structure is **core** if either:
 1. it flows through the agent-loop spine — the loop holds it, derives it, streams it, or logs it on every turn (a `Message`, a `StreamChunk`, a `SessionEvent`, the `Agent` handle itself), independent of which plugins are present; **or**
 2. it is the single headline type a plugin author writes against a pipeline — `ToolDefinition` (what every tool *is*).
 
-Everything else is documented on a **sub-page**, not here. The rule that draws the line: *the type you write, hold, or receive is core; the machinery that types it, renders it, or persists it is a sub-page detail.* So `ToolDefinition` is core, but the `SchemaSpec`/`InferArgs` DSL that types it, the `ToolCallPresentation` vocabulary that renders it, and the `SessionPersistence` seam that stores the event log are not — they live on the sub-pages below.
+Everything else is documented on a **sub-page**, not here. The rule that draws the line: *the type you write, hold, or receive is core; the machinery that types it, renders it, or persists it is a sub-page detail.* So `ToolDefinition` is core, but the `SchemaSpec`/`InferArgs` DSL that types it, the `ToolCallView`/`ToolResultView` render-intent vocabulary that renders it, and the `SessionPersistence` seam that stores the event log are not — they live on the sub-pages below.
 
 | Sub-page | Owns |
 |---|---|

docs/core-data-structures/filesystem.md

@@ -64,6 +64,8 @@ type FsWriteIntent =
 interface FsWriteOutcome {
   operation: 'create' | 'update'
   version: FsVersion
+  before: string | null
+  after: string
 }
 ```
 
@@ -82,6 +84,8 @@ interface FsEditOutcome {
   replacements: number
   replaceAll: boolean
   version: FsVersion
+  before: string
+  after: string
 }
 ```
 

docs/core-data-structures/session.md

@@ -32,7 +32,7 @@ interface SessionEventMap {
    */
   'assistant/message': { turn: number; step: number; content: ContentBlock[]; usage?: TokenUsage }
   'tool/call': { turn: number; step: number; callId: CallId; name: string; arguments: string }
-  'tool/result': { turn: number; step: number; callId: CallId; content: ContentBlock[]; isError: boolean; error?: { name: string; code: string } }
+  'tool/result': { turn: number; step: number; callId: CallId; content: ContentBlock[]; isError: boolean; error?: { name: string; code: string }; meta?: unknown }
   /** Steering content injected between steps of a running turn. */
   'steering/message': { turn: number; content: ContentBlock[]; source: MessageSource }
   /**

docs/core-data-structures/tools.md

@@ -2,7 +2,7 @@
 
 The tool pipeline of [dsh-tools](../../packages/core/tools). [core.md](core.md) introduces `ToolDefinition` as the one pipeline-authoring type promoted to the spine and `ToolSchema` as the model-facing wire shape. This page owns the full `ToolDefinition`, the typed schema DSL that builds it, the waterfall execution shapes, and the UI-presentation vocabulary.
 
-Source: [`packages/core/tools/src/index.ts`](../../packages/core/tools/src/index.ts) · [`packages/core/tools/src/schema.ts`](../../packages/core/tools/src/schema.ts)
+Source: [`packages/core/tools/src/index.ts`](../../packages/core/tools/src/index.ts) · [`packages/core/tools/src/schema.ts`](../../packages/core/tools/src/schema.ts) · [`packages/core/tools/src/presentation.ts`](../../packages/core/tools/src/presentation.ts)
 
 ## `ToolDefinition` — a registered tool
 
@@ -10,23 +10,25 @@ A `ToolSchema` (the model-facing fields) plus the `execute` function and optiona
 
 ```ts type-equiv
 interface ToolDefinition extends ToolSchema {
-  execute(args: unknown, exec: ToolExecution): Promise<ContentBlock[]>
+  execute(args: unknown, exec: ToolExecution): Promise<ToolExecuteReturn>
   /**
-   * Optional: how to present the PENDING state of one call in a UI, derived
-   * from the call's `args` (parsed arguments, `unknown` — the tool validates/
-   * narrows its own input). Returning `undefined` (or omitting the method) tells
-   * a UI to fall back to a generic presentation (title = tool name, raw args as
-   * input). Pure and side-effect-free: a UI may call it during live streaming
-   * AND a session-log replay, so it must depend only on `args`.
+   * Optional: how to present the PENDING state of one call in a UI, derived from
+   * the call's `args` (parsed arguments, `unknown` — the tool validates/narrows
+   * its own input). Returns a {@link ToolCallView} (a `card`-tagged render intent),
+   * or `undefined` (or omit the method) to fall back to a generic presentation
+   * (title = tool name, raw args as input). Pure and side-effect-free: a UI may
+   * call it during live streaming AND a session-log replay, so it must depend
+   * only on `args`.
    */
-  presentCall?(args: unknown): ToolCallPresentation | undefined
+  presentCall?(args: unknown): ToolCallView | undefined
   /**
    * Optional: how to present the COMPLETED state, given the same `args` and the
-   * `result` (`execute`'s content + whether it errored). Returning `undefined`
-   * (or omitting the method) tells a UI to keep the pending title and render the
-   * raw result content. Pure and side-effect-free for the same replay reason.
+   * `result` (`execute`'s content + whether it errored). Returns a
+   * {@link ToolResultView}, or `undefined` (or omit the method) to keep the
+   * pending title and render the raw result content. Pure and side-effect-free
+   * for the same replay reason.
    */
-  presentResult?(args: unknown, result: ToolResult): ToolResultPresentation | undefined
+  presentResult?(args: unknown, result: ToolResult): ToolResultView | undefined
 }
 ```
 
@@ -98,6 +100,13 @@ interface ToolExecutionResult {
    * text in `content` is always present; this is extra structure for code.
    */
   error?: ToolErrorInfo
+  /**
+   * The tool-private presentation payload from a successful `execute` (the object
+   * return form). Threaded onto the `tool/result` session event and back into
+   * {@link ToolResult} for `presentResult`. Opaque (`unknown`); absent when the
+   * tool attached none or the call failed.
+   */
+  meta?: unknown
 }
 ```
 
@@ -105,8 +114,11 @@ A waterfall listener receives `(exec, next)`: call `next()` to proceed (possibly
 
 ## Tool-presentation UI vocabulary
 
-How a tool wants its call shown in a UI (an editor tool-call card, a CLI log line), provider-neutral so a tool describes itself without depending on any client protocol. `presentCall` returns a `ToolCallPresentation` (pending state: `title`, `kind`, `rawInput`, `content`, `locations` — `{ path, line? }[]` files the call reads/modifies, for editor follow-along — and optional `terminal`); `presentResult` returns a `ToolResultPresentation` (completed state: replacement `title`, reformatted `content`, terminal `output`/exit). `ToolCallKind` (`'read' | 'edit' | 'delete' | 'move' | 'search' | 'execute' | 'fetch' | 'other'`) picks an icon. A `ToolTerminal` asks a capable UI to render the call as a terminal card (cwd header, output, exit-status pill).
+How a tool wants its call shown in a UI (an editor tool-call card, a CLI log line), provider-neutral so a tool describes itself without depending on any client protocol. `presentCall`/`presentResult` return a **`card`-tagged render intent** — a discriminated union a UI bridge switches on:
 
-> These shapes carry a `FIXME(tool-presentation)` in source: they grew incrementally and the call-vs-result terminal split is muddy. Before more tools/UIs depend on them, they will be redesigned (a tagged union over card kinds) and pinned in an RFC, migrating `dsh-tool-bash` and the ACP bridge together. Treat the field-level shapes here as provisional; the source is authoritative.
+- `ToolCallView` (pending): `{ card: 'generic', title, kind?, rawInput?, content?, locations? }` (the default card; `locations` is `{ path, line? }[]` files the call reads/modifies, for editor follow-along), `{ card: 'terminal', title, description?, cwd? }` (a shell command → a terminal card), or `{ card: 'diff', title, diffs, locations? }` (a file create/modify → an inline diff card; `diffs` is `{ path, oldText, newText }[]`, `oldText: null` for a new file).
+- `ToolResultView` (completed): `{ card: 'generic', title?, content? }`, `{ card: 'terminal', title?, output?, exitCode?, signal? }` (the captured run output + exit; a capable UI shows an exit-status pill, an incapable one gets a fenced ` ```console ` fallback the bridge derives from `output`), or `{ card: 'diff', title?, diffs }` (a completed file mutation → the change to show, typically the applied hunks with context lines computed from the before/after content, or a whole-file diff when there is no before-image — e.g. a file create. A `tool_call_update`'s content REPLACES the call's content, so a mutation tool returns this even when it duplicates the call-time snippet, to keep the result from clobbering the diff with result text).
 
-The full presentation field docs live in [`packages/core/tools/src/index.ts`](../../packages/core/tools/src/index.ts). The bash tool's own schemas (`bash`/`bash_output`/`bash_kill`) and the executor they drive are on [bash.md](bash.md).
+`ToolCallKind` (`'read' | 'edit' | 'delete' | 'move' | 'search' | 'execute' | 'fetch' | 'other'`) picks an icon on a generic card. `FileLocation` (`{ path, line? }`) and `FileDiff` (`{ path, oldText, newText }`) are the shared file-card vocabulary. The design is pinned in [the render-intent-union RFC](../rfc/implemented/architecture/2026-07-02-tool-render-intent-union.md); the ACP bridge maps a `diff` card to a `{ type: 'diff' }` content block, a `terminal` card to the `_meta` terminal convention, and relativizes a file card's title against the session cwd.
+
+The full presentation field docs live in [`packages/core/tools/src/presentation.ts`](../../packages/core/tools/src/presentation.ts). The bash tool's own schemas (`bash`/`bash_output`/`bash_kill`) and the executor they drive are on [bash.md](bash.md).

docs/development.i18n.yaml

@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write
+development.md: ce431d95c5dbb976d0c3ffa827af46ba608b400e
+development.zh.md: 36155ee2b93f2bc309ca1341cbed82c37e2759c9

docs/development.md

@@ -1,5 +1,7 @@
 # Development guide
 
+English | [中文](development.zh.md)
+
 This guide covers the local setup needed to work on DeepSeek Harness and understand the local hooks, daily checks, and CI gates.
 
 ## Prerequisites

docs/development.zh.md

@@ -0,0 +1,155 @@
+# 开发指南
+
+[English](development.md) | 中文
+
+本指南覆盖参与 DeepSeek Harness 开发所需的本地环境搭建，并帮助你理解本地钩子、日常检查与 CI 门禁。
+
+## 前置条件
+
+- Node.js 24 或更新版本。仓库声明 `node >=24`；CI 在 Node 24 和 26 上跑矩阵。
+- 启用了 Corepack 的 pnpm。仓库在 `package.json` 中钉住 `pnpm@11.7.0`；如果 `pnpm --version` 无法通过 Corepack 解析，先运行 `corepack enable`。
+- Git。
+- 可选：一个 DeepSeek API key，用于 coding-agent 演示和真实 API 的 e2e 测试。
+
+## 首次搭建
+
+在仓库根目录安装依赖：
+
+```sh
+pnpm install
+```
+
+安装同时会运行根目录的 `postinstall` 脚本，它通过 `scripts/install-lefthook.mjs` 从仓库 dev 依赖安装 lefthook；该包装脚本使用 lefthook 经过评审的 `--force` 模式，使已存在 `core.hooksPath` 的关联 worktree 不会让正常的 `pnpm run …` 命令失败。
+
+如果因为依赖是从缓存恢复或 `postinstall` 被跳过而缺少钩子，手动安装：
+
+```sh
+pnpm exec lefthook install --force
+```
+
+新克隆后先跑一次类型检查：
+
+```sh
+pnpm run typecheck
+```
+
+这次首跑会构建 package/vendor 构建图，并跑根目录 no-emit `tsconfig.json` 图（覆盖 examples、tests 和 scripts）。根图使用同一份源码 `paths` 映射，但依赖 project references，因此 vendor 代码在它自己的 tsconfig 设置下被检查。
+
+如果准备从新克隆或新 worktree 推送，还要构建一次：
+
+```sh
+pnpm run build
+```
+
+`pnpm run hygiene` 包含 `publint`（用构建出的 `lib/*.js` 文件校验 package 入口点）和 `verify-node-next-types`（用一个临时的 NodeNext 消费方校验构建出的声明文件）。新 worktree 在 `pnpm run build` 运行之前没有打包的 JS 和声明文件。
+
+## 环境变量
+
+真实的 DeepSeek 适配器和 coding-agent 演示从环境变量或仓库根目录一个被 gitignore 的 `.env` 读取凭证：
+
+```sh
+DEEPSEEK_API_KEY=sk-...
+DEEPSEEK_BASE_URL=https://... # optional
+```
+
+`DEEPSEEK_BASE_URL` 可选，默认为公开 API。绝不要提交真实凭证。未设置 `DEEPSEEK_API_KEY` 时，真实 API 的 e2e 套件会自动跳过。
+
+## Git 钩子
+
+lefthook 在 `lefthook.yml` 中配置，作为评审前的本地早期检查点：
+
+- `pre-commit` 运行对暂存文件的 ESLint 修复、`pnpm run typecheck` 和 vendor manifest 守卫。
+- `pre-push` 运行 `pnpm run test`、`pnpm run test:snapshot`、`pnpm run hygiene`、`pnpm run doc-sync` 和 `pnpm run verify-module-graph`。
+
+vendor manifest 守卫检查 `vendor/*/src` 下的改动是否连同对应的 `vendor/README.md` manifest 更新一起暂存。编辑 vendor 代码前先看 `vendor/README.md`。
+
+这些钩子并不与 CI 完全一致。特别是：`pre-push` 跑不带覆盖率的单元测试，而 CI 跑 `pnpm run test:coverage`；CI 还会跑 echo-agent 和 built-bin 冒烟测试，并在 Node 24 和 26 上跑矩阵。
+
+## CI 门禁
+
+GitHub 工作流在每个 pull request 上运行这些门禁：
+
+- `pnpm install --frozen-lockfile`
+- `pnpm run constraints`
+- `pnpm run typecheck`
+- `pnpm run lint`
+- `pnpm run doc-sync`
+- `pnpm run verify-module-graph`
+- `pnpm run test:coverage`
+- `pnpm run test:snapshot`
+- `pnpm run build`
+- `pnpm run hygiene`
+- 一个 echo-agent 冒烟测试，检查演示的工具调用、工具结果和 JSONL 输出
+- built-bin 冒烟测试，用纯 `node` 运行发布产物 `lib/bin.js` 入口
+
+`pnpm run hygiene` 是 `pnpm run knip && pnpm run publint && pnpm run constraints && pnpm run verify-node-next-types` 的本地简写；CI 还会把 `pnpm run constraints` 作为更早的快速失败步骤单独跑一次，然后在 `pnpm run build` 之后跑完整的 hygiene 脚本。
+
+## 日常命令
+
+在仓库根目录使用：
+
+```sh
+pnpm run test           # unit tests
+pnpm run test:coverage  # unit tests with per-file coverage gates
+pnpm run test:e2e       # real-API tests; self-skips without DEEPSEEK_API_KEY
+pnpm run typecheck      # build package/vendor outputs, then typecheck examples, tests, and scripts
+pnpm run lint           # eslint .
+pnpm run lint:fix       # eslint . --fix
+pnpm run doc-typecheck  # compile checked TypeScript snippets in Markdown docs
+pnpm run gen-cordis-catalog     # regenerate docs/cordis-catalog/events-and-services.md from source
+pnpm run verify-cordis-catalog  # fail if the cordis events/services catalog is stale
+pnpm run verify-md-wrap  # fail on hard-wrapped prose paragraphs in docs/README markdown
+pnpm run verify-type-equiv  # fail if a ```ts type-equiv doc block drifts from its source type
+pnpm run doc-sync       # doc-typecheck, cordis-catalog freshness, markdown wrap/link, and type-equiv verification
+pnpm run gen-module-graph     # regenerate docs/module-graph.md from package peerDeps
+pnpm run verify-module-graph  # fail if docs/module-graph.md is stale
+pnpm run build          # emit lib/types intermediates, then bundle lib/index.* runtime files
+pnpm run verify-node-next-types  # fail if built declarations are not NodeNext-consumable
+pnpm run hygiene        # knip, publint, workspace constraints, and NodeNext declaration check
+```
+
+改动 package 的公开行为时，在同一个变更里更新相关 README 或 JSDoc。`pnpm run doc-sync` 能抓住被检查的 TypeScript 片段、cordis 事件/服务目录漂移和硬折行的 markdown 段落，但更广泛的行文/API 同步仍需评审把关。
+
+## 演示
+
+echo 演示不需要 API 凭证：
+
+```sh
+pnpm run demo:echo
+```
+
+coding-agent 演示使用真实的 DeepSeek 适配器，需要环境变量或仓库根目录 `.env` 中的 `DEEPSEEK_API_KEY`：
+
+```sh
+pnpm run demo:coding
+```
+
+ACP 服务器演示把同一个编码 agent（智能体）通过 JSON-RPC stdio 暴露出来，同样需要 `DEEPSEEK_API_KEY`：
+
+```sh
+pnpm run demo:acp
+```
+
+## TODO 标记
+
+用三种注释标签之一标记代码中的已知问题，按紧急程度排序：
+
+- `FIXME`——应当阻塞新版本发布的问题。除非评审者明确同意可以照常合入，发布不应带着未解决的 `FIXME` 出门。
+- `TODO`——应当尽快修复的问题，等资源到位就处理。
+- `XXX`——也许某天会修的问题；优先级最低，不作承诺。
+
+选择与紧急程度匹配的标签，让扫代码的人一眼分清「发布阻塞」和「有空再说」。
+
+## 逐字记录类型（`ts type-equiv`）
+
+[核心数据结构](core-data-structures/core.md)文档粘贴真实的类型定义，让读者看到确切的形状。为防止粘贴内容在源码变化时漂移，把它围栏成 ` ```ts type-equiv `（而不是 ` ```ts `），并在 `scripts/type-equiv.manifest.json` 中登记它镜像的源文件和符号：
+
+```json
+{ "doc": "docs/core-data-structures/session.md", "symbol": "SessionEvent", "source": "packages/core/session/src/types.ts" }
+```
+
+`pnpm run verify-type-equiv`（`doc-sync` 的一环）随后通过 TypeScript 解析器从源码提取该符号的声明，并断言文档块与之一致（对空白和注释不敏感，因此文档块可以展示干净的定义，语义由行文承载）。它还强制 1:1 对应：每个 `ts type-equiv` 块恰好有一条 manifest 条目，反之亦然，因此不会有块被静默漏检，也不会有陈旧条目滞留。`doc-typecheck` 跳过 `ts type-equiv` 块（它们不能独立编译），并将其排除在 opt-out 比例之外。当你改动一个被记录的类型，门禁会失败直到你更新粘贴内容；当你增删一个块，在同一个变更里更新 manifest。
+
+## 架构上下文
+
+改动 `packages/` 下的任何东西之前先读 `docs/architecture.md`。这套代码围绕 Cordis 插件、事件溯源的会话、类型化的服务 seam（扩展点）与显式扩展点构建。

docs/i18n/README.i18n.yaml

@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write
+README.md: 6e2bbd27c3288037bafeb6cc71b801d56b956ab4
+README.zh.md: 04c99ae336cf1e96cbc185f0ccbd063ef8977944

docs/i18n/README.md

@@ -0,0 +1,50 @@
+# Bilingual documentation
+
+English | [中文](README.zh.md)
+
+This repo's documentation is read by people and agents both inside and outside the company, so the README and the docs tree are maintained in English and Simplified Chinese. This page defines the pairing contract, the enforcement gate, and the rollout policy; [translation-rules.md](translation-rules.md) defines how to translate; [terminology.md](terminology.md) is the terminology source of truth. The committed agent workflow lives in [.agents/skills/dsh-translate-docs](../../.agents/skills/dsh-translate-docs/SKILL.md).
+
+## The pairing contract
+
+- **Both languages carry equal authority.** A document may be authored and reviewed in either language first — a Chinese-first RFC is as legitimate as an English-first one — and the counterpart is translated from it. Neither file outranks the other; what binds them is that they must say the same thing.
+- **A pair is three sibling files.** The English `foo.md`, the Chinese `foo.zh.md`, and a consistency record `foo.i18n.yaml`, all in the same directory. No locale directories, no separate translation repo, no interleaved bilingual files. Pairs merge whole: a PR never lands one language without the other two files.
+- **The consistency record.** `foo.i18n.yaml` holds the full git blob hash of each side as of the last time the two were confirmed to say the same thing:
+
+  ```yaml
+  foo.md: 3f786850e387550fdab836ed7e6dc881de23001b
+  foo.zh.md: 89e6c98d92887913cadf06b2adb97f26cde4849b
+  ```
+
+  Blob hashes, not commit hashes, so the record is computable for files edited in the same PR (`git hash-object foo.md`) and consistency is a pure content comparison. The recorded hash also recovers the exact last-confirmed text of either side (`git cat-file -p <hash>`), so an out-of-sync pair is updated by diffing the edited side against its last-confirmed state and patching the counterpart minimally — never by re-translating whole files. After bringing the pair back in line, `pnpm run verify-translation-pairing --write` re-records both hashes; that yaml diff is the reviewable act of confirming consistency.
+- **Language switcher.** Both files link to each other immediately after their H1 heading: the English file carries `English | [中文](foo.zh.md)` and the Chinese file carries `[English](foo.md) | 中文`.
+- **Structure mirrors the counterpart.** Heading depths and order, list kinds, table columns, link targets, and verbatim code blocks match one to one across the pair — see [translation-rules.md](translation-rules.md) for the full preservation rules. Existing Markdown gates apply to `.zh.md` files unchanged (`verify-md-wrap`, `verify-md-links`).
+
+## The gate: verify-translation-pairing
+
+`pnpm run verify-translation-pairing` (part of `doc-sync`, so CI and the pre-push hook run it) enforces the contract mechanically:
+
+1. Every file listed as `required` in [scripts/translation-pairing.manifest.json](../../scripts/translation-pairing.manifest.json) has a complete pair.
+2. Every pair that exists at all — required or not — is complete and consistent: all three files present, each side's current blob hash equals the recorded one (editing either side without re-confirming the pair goes red), both sides carry the language switcher, and the structural signatures match in order — heading depths, verbatim code blocks (info string and content), table column counts, list kinds, and every link target apart from the switcher.
+3. Files listed as `excluded` have no `.zh.md` and no `.i18n.yaml` at all.
+
+`pnpm run verify-translation-pairing --list` prints the current pairing state of every document in scope — missing, out-of-sync, or ok — and is the work list for translation batches. It never fails; it reports.
+
+The practical rule this gate creates: **when a PR edits either side of a paired document, the same PR updates the counterpart and re-records the pair** (run the [dsh-translate-docs](../../.agents/skills/dsh-translate-docs/SKILL.md) skill, then `--write`), exactly like the repo's existing doc-sync rule for code and READMEs. A PR that leaves a pair out of sync goes red in CI.
+
+The gate's limit, stated plainly: **a green gate means the pair was confirmed consistent at these exact contents, not that the confirmation was sound.** It checks hashes and shape; it cannot judge whether the two sides actually say the same thing, or whether the wording is accurate, well-termed, and natural — that is the reviewer's half of the contract, per [translation-rules.md](translation-rules.md). A re-recorded pair with a sloppy counterpart passes the gate; it must not pass review.
+
+## Scope, exclusions, and rollout
+
+**Scope**: the root `README.md` and everything under `docs/**`. Package READMEs (`packages/**`) join the scope in a later batch.
+
+**Excluded** (never paired, and the gate rejects a `.zh.md` or `.i18n.yaml` for them):
+
+- `docs/cordis-catalog/`, `docs/tool-catalog/`, `docs/module-graph.md` — generated files; their generators emit English only today, so a hand-written translation would go stale on every regeneration. The planned follow-up is to teach the generators to emit Chinese alongside English, at which point these leave the exclusion list.
+- `docs/AGENTS.md` — agent instructions, maintained in English only like the root `AGENTS.md`.
+- `docs/i18n/terminology.md` — the terminology table is itself bilingual by construction.
+
+**Rollout**: the `required` list in the manifest is the enforcement frontier, not the goal. The goal is full bilingual coverage of the scope. Pairs land in reviewable batches (core entry docs, cookbook, RFCs, postmortems, …); each merged batch adds its files to `required`, so the gate ratchets forward and never regresses. Documents not yet in `required` are backlog — visible in `--list` — but any pair that already exists is held to the full contract regardless of the list. Pairing a document is a commitment: every later edit to either side must carry the counterpart along, so grow the frontier at the pace translation review is actually resourced, not ahead of it.
+
+## Division of labor
+
+Counterparts here are produced by an agent running [dsh-translate-docs](../../.agents/skills/dsh-translate-docs/SKILL.md) and reviewed by a human — inference is cheap here, review attention is the scarce resource. The gate exists so that neither the agent nor the reviewer has to remember the contract: pair completeness, consistency, and structure are checked mechanically, and review attention goes to translation quality and terminology, where human judgment is the whole point.

docs/i18n/README.zh.md

@@ -0,0 +1,50 @@
+# 双语文档
+
+[English](README.md) | 中文
+
+本仓库的文档会被公司内外的人和 agent（智能体）阅读，因此 README 与 docs 目录树以英文和简体中文双语维护。本页定义配对契约、强制门禁与推进策略；[translation-rules.md](translation-rules.md) 定义如何翻译；[terminology.md](terminology.md) 是术语真源。进仓的 agent 工作流见 [.agents/skills/dsh-translate-docs](../../.agents/skills/dsh-translate-docs/SKILL.md)。
+
+## 配对契约
+
+- **两种语言同权。**一篇文档可以先用任一语言撰写和评审——先写中文的 RFC 与先写英文的一样正当——另一侧由它翻译而来。两个文件谁也不高于谁；约束它们的是二者必须说同样的话。
+- **一对文档是三个同目录文件。**英文 `foo.md`、中文 `foo.zh.md`，加一份一致性记录 `foo.i18n.yaml`，都在同一目录。不用语言目录，不用独立翻译仓库，不用中英混排的单文件。配对整体合入：PR 永远不会只带一种语言而缺其余两个文件。
+- **一致性记录。**`foo.i18n.yaml` 保存两侧文件在上一次被确认「说同样的话」时各自的完整 git blob hash：
+
+  ```yaml
+  foo.md: 3f786850e387550fdab836ed7e6dc881de23001b
+  foo.zh.md: 89e6c98d92887913cadf06b2adb97f26cde4849b
+  ```
+
+  用 blob hash 而不是 commit hash，这样同一个 PR 里改动的文件也能算出记录（`git hash-object foo.md`），一致性是纯内容比较。记录的 hash 还能还原任一侧上次确认时的确切文本（`git cat-file -p <hash>`），所以失去同步的配对是「把被改的一侧与其上次确认状态做 diff、再最小化地修补另一侧」——从不整篇重译。两侧对齐后，`pnpm run verify-translation-pairing --write` 重新记录两个 hash；那份 yaml diff 就是「确认一致」这个动作本身，可以被评审。
+- **语言切换行。**两个文件在各自 H1 标题之后立即互链：英文文件带 `English | [中文](foo.zh.md)`，中文文件带 `[English](foo.md) | 中文`。
+- **结构与另一侧一一对应。**标题深度与顺序、列表类型、表格列、链接目标与逐字节一致的代码块在配对两侧一一对应——完整保持规则见 [translation-rules.md](translation-rules.md)。既有 Markdown 门禁对 `.zh.md` 文件原样生效（`verify-md-wrap`、`verify-md-links`）。
+
+## 门禁：verify-translation-pairing
+
+`pnpm run verify-translation-pairing`（`doc-sync` 的一环，因此 CI 和 pre-push 钩子都会运行）机械地强制执行这份契约：
+
+1. [scripts/translation-pairing.manifest.json](../../scripts/translation-pairing.manifest.json) 中 `required` 列出的每个文件都有完整配对。
+2. 任何已存在的配对——无论是否 required——都完整且一致：三个文件齐全、每一侧的当前 blob hash 等于记录值（改了任一侧而没重新确认配对就变红）、双方都带语言切换行、结构签名按序一致——标题深度、逐字节一致的代码块（信息字符串与内容）、表格列数、列表类型，以及除切换行之外的每个链接目标。
+3. 列为 `excluded` 的文件完全没有 `.zh.md`，也没有 `.i18n.yaml`。
+
+`pnpm run verify-translation-pairing --list` 打印范围内每篇文档的当前配对状态——missing、out-of-sync 或 ok——是翻译批次的工作清单。它从不失败；它只报告。
+
+这个门禁带来的实际规则是：**当一个 PR 修改了已配对文档的任一侧时，同一个 PR 更新另一侧并重新记录配对**（运行 [dsh-translate-docs](../../.agents/skills/dsh-translate-docs/SKILL.md) skill（技能），再 `--write`），与本仓库既有的代码/README doc-sync 规则完全一致。留下失去同步的配对的 PR 会在 CI 变红。
+
+把门禁的边界说白：**门禁绿意味着这对文档曾在当前内容上被确认一致，不意味着这次确认本身是对的。**它检查 hash 和形状；它无法判断两侧是否真的在说同样的话，也无法判断措辞是否准确、术语是否得当、行文是否自然——那是契约中评审者的那一半，见 [translation-rules.md](translation-rules.md)。重新记录了 hash 但另一侧翻得潦草的配对能通过门禁；它不得通过评审。
+
+## 范围、排除与推进
+
+**范围**：根 `README.md` 与 `docs/**` 下的全部内容。package README（`packages/**`）在后续批次加入范围。
+
+**排除**（永不配对，门禁拒绝为它们建 `.zh.md` 或 `.i18n.yaml`）：
+
+- `docs/cordis-catalog/`、`docs/tool-catalog/`、`docs/module-graph.md`——生成文件；生成器目前只输出英文，手写译文在每次重新生成时必然陈旧。计划中的后续工作是让生成器同时输出中文，届时这些文件移出排除清单。
+- `docs/AGENTS.md`——agent 指令，与根 `AGENTS.md` 一样只以英文维护。
+- `docs/i18n/terminology.md`——术语表本身即是双语构造。
+
+**推进**：manifest 中的 `required` 列表是强制边界，不是目标。目标是范围内的全量双语覆盖。配对按可评审的批次落地（核心入口文档、cookbook、RFC、postmortem……）；每个批次合入后把其文件加进 `required`，门禁只进不退。尚未进入 `required` 的文档是 backlog——在 `--list` 中可见——但任何已存在的配对无论在不在清单里都按完整契约检查。给一篇文档配对是一份承诺：此后对任一侧的每次修改都必须带上另一侧，所以边界的扩张要跟上翻译评审的实际投入节奏，不要抢在前面。
+
+## 分工
+
+这里的对侧译文由运行 [dsh-translate-docs](../../.agents/skills/dsh-translate-docs/SKILL.md) 的 agent 产出、由人评审——在这里推理（inference）很便宜，评审注意力才是稀缺资源。门禁的存在让 agent 和评审者都不必记住契约：配对完整性、一致性和结构由机械检查兜底，评审注意力投向翻译质量与术语——这正是人的判断的用武之地。

docs/i18n/terminology.md

@@ -7,6 +7,7 @@
 | ACP | ACP | 首次出现可写：ACP（Agent Client Protocol） |
 | AI | AI | 首次出现可写：人工智能（AI） |
 | API | API | |
+| CI | CI | |
 | CLI | CLI | 首次出现可写：命令行界面（CLI） |
 | Cordis | Cordis | 保留英文 |
 | Function Calling | Function Calling | 首次出现可写：Function Calling（函数调用） |
@@ -17,16 +18,22 @@
 | loader | loader | |
 | LLM | LLM | 首次出现可写：大语言模型（LLM） |
 | MCP | MCP | |
+| PR | PR | 首次出现可写：PR（pull request） |
 | RAG | RAG | 首次出现可写：检索增强生成（RAG） |
 | SDK | SDK | |
 | SSE | SSE | 首次出现可写：SSE（Server-Sent Events） |
 | agent | agent | 首次出现可写：agent（智能体） |
 | agent loop | agent loop | |
+| backlog | backlog | 双语翻译语境指待翻清单 |
+| blob hash | blob hash | git 对象哈希；`git hash-object` 的结果 |
+| doc-sync | doc-sync | 仓库门禁名，保留英文 |
+| e2e | e2e | |
 | fiber | fiber | 首次出现可写：fiber（插件运行时） |
 | fixture | fixture | 指测试前置数据或环境 |
 | fork | fork | 保留英文 |
 | harness | harness | 保留英文 |
 | manifest | manifest | 描述模块或工具元数据的文件 |
+| monorepo | monorepo | |
 | schema DSL | schema DSL | |
 | schema | schema | 保留英文 |
 | seam | seam | 首次出现可写：seam（扩展点） |
@@ -36,6 +43,7 @@
 | subagent | subagent | 首次出现可写：subagent（子 agent） |
 | transcript | transcript | 首次出现可写：transcript（文本记录）；指会话渲染给用户或编辑器的完整文本，区别于事件日志（event log） |
 | waterfall | waterfall | 首次出现可写：waterfall（瀑布式事件） |
+| worktree | worktree | git 工作区概念，保留英文 |
 | wire format | 协议格式 | 首次出现可写：协议格式（wire format） |
 | adapter contract | 适配器契约 | 首次出现可写：适配器契约（adapter contract） |
 | adapter | 适配器 | |
@@ -54,28 +62,39 @@
 | config | 配置 | |
 | context | 上下文 | |
 | context compaction | 上下文压缩 | 首次出现可写：上下文压缩（context compaction） |
+| contract | 契约 | 如：配对契约（pairing contract）；另见 adapter contract |
 | coverage | 覆盖率 | |
 | crash recovery | 崩溃恢复 | |
 | dispose | dispose | 首次出现可写：dispose（释放资源）；正文优先保留英文 |
 | durability | 持久性 | |
+| enforcement frontier | 强制边界 | i18n 机制词：manifest `required` 清单所划的门禁生效范围 |
 | event log | 事件日志 | |
 | event | 事件 | |
 | event stream | 事件流 | |
+| event-sourced | 事件溯源 | DDD 社区通行译法 |
 | executor | 执行器 | |
 | extension | 扩展 | |
+| fail-fast | 快速失败 | |
+| fenced code block | 围栏代码块 | MDN 中文同译 |
 | finish reason | 结束原因 | |
+| fingerprint | 指纹 | i18n 机制词：`.zh.md` 首行记录英文源 blob hash 的 `i18n-source` 注释 |
 | foreground run | 前台运行 | |
+| freshness | 新鲜度 | MDN HTTP 缓存中文同译（freshness lifetime → 新鲜度生命周期）；指译文相对英文源的同步状态 |
 | hook | 钩子 | |
 | implementation | 实现 | |
 | inference | 推理（inference） | 每次提及时保留英文括注，避免与 reasoning 混淆 |
+| info string | 信息字符串 | CommonMark 中文同译；代码围栏 ``` 之后的语言标注 |
 | injection | 注入 | |
 | interface | 接口 | |
 | integration | 集成 | |
+| language switcher | 语言切换行 | i18n 机制词：双语配对文件顶部的互链行 |
 | memory | memory / 记忆 / 内存 | 按上下文区分：agent memory 译为“记忆”；resource/memory usage 译为“内存” |
 | message | 消息 | |
 | mod | 模组 | 区别于 module（模块）；plugin 译作「插件」 |
 | model provider | 模型提供方 | |
 | module | 模块 | |
+| orphan | 孤立 | git 官方中文同译（如「孤立分支」）；指英文源已不存在的 `.zh.md`；不要译作：孤儿 |
+| pairing | 配对 | |
 | permission | 权限 | |
 | persistence | 持久化 | |
 | pipeline | 流水线 | |
@@ -93,11 +112,15 @@
 | service | 服务 | |
 | session | 会话 | |
 | session event | 会话事件 | |
+| smoke test | 冒烟测试 | |
 | snapshot | 快照 | |
 | spine | 主干 | |
+| staged | 暂存 | git 官方中文同译 |
+| stale | 陈旧 | MDN HTTP 缓存中文同译，与「新鲜（fresh）」成对；门禁输出保留英文 `stale`；expired 才译「过期」 |
 | step | 步骤 | |
 | stream | 流 | |
 | streaming | 流式输出 | |
+| structural signature | 结构签名 | i18n 机制词：配对门禁比对的有序结构序列 |
 | system prompt | 系统提示词 | |
 | taxonomy | 分类体系 | |
 | token usage | token 用量 | |

docs/i18n/translation-rules.i18n.yaml

@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write
+translation-rules.md: 4e190f58469f7d402dfa5600f17cf1621484f138
+translation-rules.zh.md: 89a1cddd23126f24354ce1f8d9af4e7bd403454d

docs/i18n/translation-rules.md

@@ -0,0 +1,60 @@
+# Translation rules
+
+English | [中文](translation-rules.zh.md)
+
+How to translate between the two sides of a documentation pair in this repo. Both languages carry equal authority ([README.md](README.md)): a change is authored in either language, and that side is the source for that update — these rules govern producing or updating the counterpart. They bind humans and agents equally; the committed agent workflow that applies them is [.agents/skills/dsh-translate-docs](../../.agents/skills/dsh-translate-docs/SKILL.md). Rule levels follow RFC 2119 usage: **MUST** / **MUST NOT** are gate- or review-blocking; **SHOULD** needs a stated reason to deviate; **MAY** is discretionary.
+
+## Faithfulness
+
+- The counterpart MUST say what the authored side says — no added behavior, prerequisites, warnings, version claims, or examples, and no dropped ones. If the pair disagrees on substance, neither language wins by default: fix the side that is wrong, then bring the other along in the same change.
+- The counterpart SHOULD read as natural technical writing in its own language, not word-by-word gloss. Translate meaning, restructure sentences where the target grammar wants it, and keep the author's register — terse stays terse.
+- Do not translate the untranslatable: if a sentence resists natural rendering because it leans on an idiom of the source language, translate the idea, not the idiom.
+
+## Structure preservation
+
+The paired files MUST match one to one in:
+
+- heading hierarchy (same levels, same order — heading TEXT is translated),
+- list shape and numbering,
+- tables (same columns, same row order; header cells translated per terminology),
+- fenced code blocks — **byte-identical, including comments**; code is part of the verified surface (` ```ts ` blocks compile under `doc-typecheck`), and an edited comment is drift the fence-count gate cannot see,
+- inline code spans (commands, flags, config keys, file paths, event names, API names, version numbers) — verbatim, never translated or reformatted,
+- links and anchors: every relative link MUST point at the same target in both files — by convention the `.md` path, not the `.zh.md` sibling — so links never dangle when one pair lands before its neighbors. The ONLY zh-specific link is the language switcher. Link TEXT is translated; the target is not.
+
+The repo's Markdown conventions apply to `.zh.md` files unchanged: one physical line per paragraph (`verify-md-wrap`), resolving relative links (`verify-md-links`), exactly one trailing newline.
+
+## Terminology
+
+- [terminology.md](terminology.md) is the source of truth in both directions. Before translating, load it; while translating, every term it lists MUST be rendered exactly as it specifies, including its first-occurrence annotations (e.g. `agent（智能体）` on first mention, plain `agent` after) and its "不要译作" prohibitions. When the Chinese side is authored first, the English counterpart uses the table's English column the same way.
+- A technical term NOT in the table MAY be translated only when a major Chinese-language OSS or vendor doc has an established rendering for it (K8s/Vue/MDN Chinese docs, 微软简中风格指南, big-tech project docs). Cite the precedent in the PR.
+- A term with NO established precedent MUST stay in English in the translation and MUST be listed in the PR description under 「待定术语」(pending terms) with a suggested rendering for the reviewer to decide. MUST NOT invent a Chinese rendering inline — an unprecedented translation creates exactly the ambiguity the terminology table exists to prevent. Decided terms then land in [terminology.md](terminology.md) in the same PR or a follow-up.
+
+## Typography
+
+These rules govern the Chinese side; the English side follows the repo's normal Markdown conventions (root `AGENTS.md`). The mixed-script rules below follow the cross-project consensus of the [MDN Simplified Chinese translation guide](https://github.com/mdn/translated-content/blob/main/docs/zh-cn/translation-guide.md), the [Kubernetes zh-cn localization guide](https://kubernetes.io/zh-cn/docs/contribute/localization_zh/), the [Vue.js Chinese translation conventions](https://github.com/vuejs-translations/docs-zh-cn/wiki/%E7%BF%BB%E8%AF%91%E9%A1%BB%E7%9F%A5), and [中文文案排版指北](https://github.com/sparanoid/chinese-copywriting-guidelines), which in turn ground in [W3C clreq](https://www.w3.org/TR/clreq/) and GB/T 15834—2011:
+
+- MUST put one half-width space between Chinese text and Latin words, and between Chinese text and numerals: `每个 plugin 注册 3 个 tool`。No space between a full-width punctuation mark and anything.
+- MUST use full-width (Chinese) punctuation in Chinese prose: `，。：；？！（）「」`. Half-width punctuation stays inside code spans, inside complete English sentences quoted as-is, and in numbers (`3.5`, `1,024`).
+- Enumeration commas: a Chinese list of parallel items uses 顿号（、）, not commas.
+- MUST NOT use full-width digits or full-width Latin letters — `１２３` never, `123` always.
+- Proper nouns keep their canonical casing: GitHub, TypeScript, DeepSeek — never `github`/`Github` unless quoting code.
+- Second person is 你, not 您 (matches the Vue and Kubernetes Chinese conventions and this repo's direct voice).
+- Emphasis markers (`**bold**`, `*italic*`) stay on the same spans as the source; Chinese has no italics, so the rendered emphasis may look identical — do not substitute quotation marks or other decoration.
+
+## Quality bar
+
+- A pair is done when a bilingual engineer reading either file alone gets everything a reader of the other gets — same facts, same caveats, same tone — and nothing extra.
+- Before handing off, self-check the result against this file and re-read the counterpart ALONE, without the source side by side; awkward phrasing is easier to hear without the source anchoring you.
+- The mechanical contract (consistency record, switcher, structure, wrap, links) is checked by `pnpm run verify-translation-pairing` and the rest of `doc-sync` — run them; do not hand-verify what a gate covers.
+
+## References
+
+Authorities cited by these rules, for humans and agents who want the underlying reasoning:
+
+- [中文文案排版指北](https://github.com/sparanoid/chinese-copywriting-guidelines) — the de-facto community standard for mixed CJK/Latin spacing and punctuation.
+- [MDN zh-CN translation guide](https://github.com/mdn/translated-content/blob/main/docs/zh-cn/translation-guide.md) — an in-repo translation-rules file of the same shape as this one; spacing, punctuation, and glossary practice.
+- [Kubernetes zh-cn localization guide](https://kubernetes.io/zh-cn/docs/contribute/localization_zh/) — terminology-first-occurrence and punctuation practice from the largest zh localization team.
+- [Vue.js docs-zh-cn 翻译须知](https://github.com/vuejs-translations/docs-zh-cn/wiki/%E7%BF%BB%E8%AF%91%E9%A1%BB%E7%9F%A5) — per-term translate/keep decisions and tone.
+- [zh-style-guide](https://zh-style-guide.readthedocs.io) — a community Chinese technical-writing style guide whose rule-level taxonomy (and RFC 2119 keyword levels) this file borrows; aggregates GB/T 15834/15835, clreq, and vendor guides.
+- [W3C clreq](https://www.w3.org/TR/clreq/) and the [Microsoft Simplified Chinese style guide](https://learn.microsoft.com/en-us/globalization/reference/microsoft-style-guides) — the formal typographic and vendor-localization baselines.
+- GB/T 19682-2005《翻译服务译文质量要求》 — the national standard whose three base requirements (忠实原文、术语统一、行文通顺) this file's Faithfulness and Terminology sections operationalize.

docs/i18n/translation-rules.zh.md

@@ -0,0 +1,60 @@
+# 翻译规则
+
+[English](translation-rules.md) | 中文
+
+本文规定如何在本仓库文档配对的两侧之间进行翻译。两种语言同权（见 [README.md](README.md)）：一次变更用任一语言撰写，那一侧就是这次更新的源——本文的规则约束的是产出或更新另一侧。这些规则对人和 agent（智能体）同等生效；应用它们的进仓 agent 工作流是 [.agents/skills/dsh-translate-docs](../../.agents/skills/dsh-translate-docs/SKILL.md)。规则级别沿用 RFC 2119 的用法：**必须（MUST）**／**禁止（MUST NOT）**会卡门禁或评审；**应当（SHOULD）**偏离时要说明理由；**可以（MAY）**自行裁量。
+
+## 忠实性
+
+- 另一侧必须说撰写侧所说的话——不添加行为、前置条件、警告、版本声明或示例，也不丢弃任何一项。如果两侧在实质内容上不一致，没有哪种语言默认获胜：改正错的那一侧，并在同一个变更里把另一侧带上。
+- 另一侧应当读起来是其语言自然的技术文字，而不是逐词对照。翻译语义，在目标语言语法需要处重组句子，并保持原作者的语域——简练的保持简练。
+- 不要翻译不可译的东西：一句话如果依赖源语言的习语而无法自然转换，就翻译它的意思，而不是习语本身。
+
+## 结构保持
+
+配对的两个文件必须在以下方面一一对应：
+
+- 标题层级（相同级别、相同顺序——标题的**文字**要翻译），
+- 列表形态与编号，
+- 表格（相同的列、相同的行序；表头单元格按术语表翻译），
+- 围栏代码块——**逐字节一致，包括注释**；代码属于受验证的范围（` ```ts ` 块要通过 `doc-typecheck` 编译），而被改动的注释是代码块计数门禁看不见的漂移，
+- 行内代码（命令、flag、配置键、文件路径、事件名、API 名、版本号）——原样保留，从不翻译或重排，
+- 链接与锚点：每个相对链接在两个文件中必须指向相同的目标——按约定是 `.md` 路径而非 `.zh.md` 兄弟文件——这样某对文档先于相邻文件落地时，链接也永不悬空。唯一的 zh 特有链接是语言切换行。链接**文字**翻译；链接目标不翻。
+
+本仓库的 Markdown 约定对 `.zh.md` 文件原样生效：一个段落一个物理行（`verify-md-wrap`）、相对链接必须可解析（`verify-md-links`）、文件末尾恰好一个换行。
+
+## 术语
+
+- [terminology.md](terminology.md) 是双向的术语真源。翻译前先加载它；翻译中，表内的每个术语都必须严格按表规定的译法呈现，包括首次出现的括注（如首现写 `agent（智能体）`，之后写 `agent`）与「不要译作」的禁项。中文先行撰写时，英文另一侧同样按表中英文列使用术语。
+- 表中**没有**的技术术语，只有当某个主要中文 OSS 或厂商文档已有成型译法时（K8s／Vue／MDN 中文文档、微软简中风格指南、大厂项目文档）才可以翻译。在 PR 中注明先例出处。
+- **没有**成型先例的术语，译文中必须保留英文，并且必须在 PR 描述的「待定术语」下列出、附上建议译法交评审者定夺。禁止就地发明中文译法——无先例的翻译恰恰制造了术语表要防止的歧义。定下来的术语随后在同一个 PR 或后续 PR 进入 [terminology.md](terminology.md)。
+
+## 排版
+
+本节规则约束中文一侧；英文一侧遵循仓库常规的 Markdown 约定（根 `AGENTS.md`）。下面的中西文混排规则遵循 [MDN 简体中文翻译指南](https://github.com/mdn/translated-content/blob/main/docs/zh-cn/translation-guide.md)、[Kubernetes 中文本地化指南](https://kubernetes.io/zh-cn/docs/contribute/localization_zh/)、[Vue.js 中文翻译须知](https://github.com/vuejs-translations/docs-zh-cn/wiki/%E7%BF%BB%E8%AF%91%E9%A1%BB%E7%9F%A5)与[中文文案排版指北](https://github.com/sparanoid/chinese-copywriting-guidelines)的跨项目共识，其根据是 [W3C clreq](https://www.w3.org/TR/clreq/) 与 GB/T 15834—2011：
+
+- 必须在中文与拉丁词之间、中文与数字之间各留一个半角空格：`每个 plugin 注册 3 个 tool`。全角标点与任何字符之间不加空格。
+- 中文行文必须使用全角（中文）标点：`，。：；？！（）「」`。半角标点保留在代码内、按原样引用的完整英文句子内、以及数字内（`3.5`、`1,024`）。
+- 并列顿开：中文的并列项之间用顿号（、），不用逗号。
+- 禁止使用全角数字或全角拉丁字母——永远不写 `１２３`，永远写 `123`。
+- 专有名词保持规范大小写：GitHub、TypeScript、DeepSeek——除非引用代码，否则绝不写 `github`／`Github`。
+- 第二人称用「你」，不用「您」（与 Vue、Kubernetes 中文约定及本仓库的直接语气一致）。
+- 强调标记（`**加粗**`、`*斜体*`）落在与另一侧相同的文字段上；中文没有斜体，渲染效果可能看不出差别——不要用引号或其他装饰替代。
+
+## 质量线
+
+- 一对文档的完成标准：一位双语工程师只读其中任一文件，得到与另一文件读者完全相同的信息——相同的事实、相同的告诫、相同的语气——并且没有任何多余的内容。
+- 交付前，对照本文自查一遍，并**只读另一侧**再通读一遍、不看源侧对照；没有源文锚着，别扭的表述更容易被听出来。
+- 机械契约（一致性记录、切换行、结构、折行、链接）由 `pnpm run verify-translation-pairing` 和 `doc-sync` 的其余门禁检查——跑门禁；门禁覆盖的不要手工核对。
+
+## 参考资料
+
+本文各规则引用的权威出处，供想了解底层依据的人和 agent 查阅：
+
+- [中文文案排版指北](https://github.com/sparanoid/chinese-copywriting-guidelines)——中西文混排空格与标点的社区事实标准。
+- [MDN 简体中文翻译指南](https://github.com/mdn/translated-content/blob/main/docs/zh-cn/translation-guide.md)——与本文同形态的进仓翻译规则文件；空格、标点与术语表实践。
+- [Kubernetes 中文本地化指南](https://kubernetes.io/zh-cn/docs/contribute/localization_zh/)——最大的中文本地化团队的术语首现与标点实践。
+- [Vue.js docs-zh-cn 翻译须知](https://github.com/vuejs-translations/docs-zh-cn/wiki/%E7%BF%BB%E8%AF%91%E9%A1%BB%E7%9F%A5)——逐术语的译／留决策与语气。
+- [zh-style-guide](https://zh-style-guide.readthedocs.io)——社区中文技术文档写作规范，本文借用了它的规则级别分类体系（与 RFC 2119 关键词分级）；它聚合了 GB/T 15834/15835、clreq 与各厂商指南。
+- [W3C clreq](https://www.w3.org/TR/clreq/) 与[微软简体中文风格指南](https://learn.microsoft.com/en-us/globalization/reference/microsoft-style-guides)——排版学与厂商本地化的正式基线。
+- GB/T 19682-2005《翻译服务译文质量要求》——国家标准；本文「忠实性」与「术语」两节把它的三项基本要求（忠实原文、术语统一、行文通顺）落成可操作规则。

docs/module-graph.md

@@ -69,6 +69,7 @@ graph TD
   tool-bash --> tools
   tool-fs --> fs
   tool-fs --> llm
+  tool-fs --> session
   tool-fs --> system-prompt
   tool-fs --> tools
   tool-todo --> agent
@@ -148,7 +149,7 @@ graph TD
 | `agent-loop` | `agent`, `llm`, `session`, `session-persistence`, `system-prompt`, `tools` |
 | `subagent` | `agent`, `llm`, `tools` |
 | `tool-bash` | `agent`, `bash`, `llm`, `tools` |
-| `tool-fs` | `fs`, `llm`, `system-prompt`, `tools` |
+| `tool-fs` | `fs`, `llm`, `session`, `system-prompt`, `tools` |
 | `tool-todo` | `agent`, `session`, `tools` |
 | `tool-web` | `llm`, `system-prompt`, `tools`, `web` |
 | `agent-core` | `agent`, `agent-loop`, `invariants`, `llm`, `session`, `system-prompt`, `tool-bash`, `tools` |

docs/rfc/README.md

@@ -126,6 +126,8 @@ Do NOT write one for a mechanical or local choice (a variable name, a one-file r
 | [Web capability seam — provider registry and model-facing web tools](implemented/architecture/2026-06-24-web-capability-seam.md) | 2026-06-24 |
 | [Make `dsh-fs-policy` an event-gate plugin, not a method interface](implemented/architecture/2026-06-26-file-context-as-event-gate.md) | 2026-06-26 |
 | [Resolve filesystem paths against the caller's session cwd](implemented/architecture/2026-07-02-fs-per-session-cwd.md) | 2026-07-02 |
+| [Tagged render-intent union for tool-call presentation](implemented/architecture/2026-07-02-tool-render-intent-union.md) | 2026-07-02 |
+| [Result-time applied-hunk diffs for file mutations](implemented/architecture/2026-07-02-result-time-applied-hunk-diffs.md) | 2026-07-02 |
 | [Add direct directory listing to the filesystem seam](implemented/architecture/2026-07-03-filesystem-directory-listing-seam.md) | 2026-07-03 |
 
 ### Process
@@ -143,6 +145,7 @@ Do NOT write one for a mechanical or local choice (a variable name, a one-file r
 | [Generated cordis events + services catalog](implemented/process/2026-06-20-generated-cordis-catalog.md) | 2026-06-20 |
 | [Classify RFCs by kind via path-encoded subdirectories](implemented/process/2026-06-20-rfc-classification.md) | 2026-06-20 |
 | [Generated tool-schema catalog (boot-and-harvest)](implemented/process/2026-07-02-tool-schema-catalog.md) | 2026-07-02 |
+| [Bilingual documentation via paired sibling files and a pairing gate](implemented/process/2026-07-02-bilingual-docs-and-pairing-gate.md) | 2026-07-02 |
 
 ### Testing
 

docs/rfc/implemented/architecture/2026-07-02-result-time-applied-hunk-diffs.md

@@ -0,0 +1,55 @@
+# RFC: Result-time applied-hunk diffs for file mutations
+
+Status: implemented
+
+## Problem
+
+The [tagged render-intent union](2026-07-02-tool-render-intent-union.md) gave `dsh-tool-fs` write/edit a `card:'diff'` at CALL time, derived purely from the tool's args: write ⇒ `{oldText:null, newText:content}` (the whole new file), edit ⇒ `{oldText:old_string, newText:new_string}` (the bare replaced snippet). An editor renders that as an inline diff, but it is a **context-free** diff — the bare `old_string`→`new_string` with no surrounding lines, and a `replace_all` that touched five scattered sites still renders as one snippet pair.
+
+Driving `claude-agent-acp`'s own ACP bridge shows what a full editor diff looks like: after the mutation applies, it emits a SECOND `tool_call_update` whose diff is the **applied hunk with ±3 context lines** (and one hunk per changed site for `replace_all`), reconstructed from the tool's `structuredPatch`. That result-time hunk is what makes Zed show the change *in place* in the file rather than as a floating snippet. Our tools stopped at the call-time snippet; the completed result carried only the plain "updated successfully" text, no diff.
+
+The obstacle is a seam boundary: `presentResult(args, result)` is a **pure function of `args` + the model-facing `result` (`{content, isError}`)** — it runs on live streaming AND on session-log replay, so it must be replay-deterministic and cannot do I/O. It never sees the file's before/after content, and `FsEditOutcome`/`FsWriteOutcome` carried only a replacement count + version, not the text. So there was no way to compute — or even carry — an applied hunk to the presenter.
+
+## Decision
+
+Add a **persisted, tool-private presentation channel** so a tool's `execute` can attach a result-time render payload that survives replay, and use it to carry the applied-hunk diff.
+
+### 1. A `meta` channel on the tool result (core)
+
+`ToolDefinition.execute` may now return either its model-facing `ContentBlock[]` (unchanged, the common case) OR `{ content: ContentBlock[]; meta?: unknown }`:
+
+```ts ignore-check
+type ToolExecuteReturn = ContentBlock[] | { content: ContentBlock[]; meta?: unknown }
+```
+
+`meta` is an opaque payload the core never interprets — typed `unknown` at every seam (the tool that produced it owns and narrows its shape). It MUST be JSON-serializable: the registry threads it onto the `tool/result` **session event**, and `Session.append` runtime-validates all event data with the existing `isJsonValue` predicate, so a non-serializable `meta` is rejected at the source. On replay the same `meta` is read back and handed to `presentResult` via a widened `ToolResult` (`{ content, isError, meta? }`). Because the payload lives in the event log, the diff reproduces on session reload / snapshot replay **for free** — the event-sourcing guarantee, not a re-computation. Typing `meta` as `unknown` (rather than a shared serializable-value type) keeps the tools core free of a dependency it would otherwise take just to name the type, and the runtime `isJsonValue` gate — not the static type — is what actually enforces serializability.
+
+This is the general shape ("a tool attaches durable result presentation"), not an fs-specific one — any tool can use it.
+
+### 2. The tool computes the hunk; the backend returns before/after (fs)
+
+Per the [capability-seam split](2026-06-13-capability-seams.md), the storage backend returns only **storage facts** and the model-facing tool owns **presentation**:
+
+- `dsh-fs` widens `FsEditOutcome` with `{ before: string; after: string }` and `FsWriteOutcome` with `{ before: string | null; after: string }` (`before: null` ⇒ a create, or an existing-but-undiffable binary/non-UTF-8 file). The local backend already holds both texts at write time; it returns them as raw LF-normalized text, with **no diff/UI concept** entering the seam.
+- `dsh-tool-fs` computes the contextual hunk from before/after and attaches it as `meta: { diffs: FileDiff[] }`. A contextual hunk is computed only when a before-version exists — edit always; write on overwrite; a create has no before, matching `claude-agent-acp`'s empty `structuredPatch` on create. But the completed `tool_call_update` is ALWAYS a `diff` card for a successful mutation: an ACP `tool_call_update.content` REPLACES the call's content, so rendering the model-facing result text would clobber the pending diff. So `write`'s result falls back to an args-derived whole-file diff (`oldText: null`) when it has no contextual hunk (a create, or an overwrite whose content is unchanged), and `edit` — which always changes content — always has a hunk. A failed/aborted/policy-rejected mutation applied nothing, so it carries no `meta` and falls through to the generic error rendering (its message must show).
+
+### 3. The bridge renders a `diff` result card
+
+`ToolResultView` gains a `DiffResultView { card:'diff'; title?; diffs: FileDiff[] }`; the bridge's result-side `switch (view.card)` gets a `diff` arm emitting the `{type:'diff'}` `ToolCallContent` blocks (mirroring the call-side arm). An ACP `tool_call_update.content` REPLACES the call's content in an editor, so the result diff **supersedes** the call-time snippet (and keeps the model-facing result text from clobbering it) — the two-update sequence (call snippet, then result diff) matches `claude-agent-acp` exactly.
+
+### The diff algorithm — a third-party runtime dependency over vendoring
+
+Computing hunks-with-context is a solved problem with sharp edge cases (grouping, context coalescing, the trailing-newline marker). Rather than hand-roll it, `dsh-tool-fs` takes a runtime dependency on the npm [`diff`](https://www.npmjs.com/package/diff) package (a `^9.0.0` range, exact-pinned by the lockfile; it ships its own types) and uses its `structuredPatch`. The repo's default is to vendor Cordis-framework source, but that policy is about the *framework*; a leaf tool package taking a small, well-known, self-typed utility dependency is the same shape as `dsh-acp` depending on `@agentclientprotocol/sdk`. Vendoring a diff algorithm would be re-implementing a battle-tested one for no benefit — the [pre-release "foundation over blast radius"](../../../../AGENTS.md) reasoning does not argue for re-deriving standard algorithms. The dependency's output is normalized in one small module (`packages/fs/tool-fs/src/diff.ts`).
+
+## Non-goals
+
+- **Live incremental diff streaming.** The hunk is computed once, after the mutation completes; there is no per-keystroke diff.
+- **Diffing a binary/non-UTF-8 overwrite.** `before` is `null` for such a file (it has no text diff basis); the write still succeeds and the result renders a whole-file diff (`oldText: null`) rather than a contextual hunk.
+- **Rename/move diffs.** Only content diffs of a single resolved path.
+- **Bounding the overwrite diff basis.** An overwrite reads the whole prior file into memory to compute the contextual hunk (on top of the new content already held), so a very large text overwrite allocates both texts for a UI-only diff. A future refinement can bound the pre-read and fall back to a whole-file / no contextual diff above a size threshold; tracked as `TODO(overwrite-diff-bound)` at the read site.
+
+## Related
+
+- Completes the one remaining representation difference named as a non-goal in [Tagged render-intent union](2026-07-02-tool-render-intent-union.md) — that RFC's Non-goals section is updated to record that applied-hunk diffs shipped here.
+- Builds on the [filesystem capability seam](2026-06-17-filesystem-capability-seam.md) (the before/after are storage facts the backend returns) and [event-sourced sessions](2026-06-11-event-sourced-sessions.md) (the `meta` payload persists on the `tool/result` event, so replay reproduces the card).
+- The `meta` channel is deliberately generic: a future tool (a structured search, a data-table result) can attach its own durable result presentation without another core change.

docs/rfc/implemented/architecture/2026-07-02-tool-render-intent-union.md

@@ -0,0 +1,70 @@
+# RFC: Tagged render-intent union for tool-call presentation
+
+Status: implemented
+
+## Problem
+
+A tool declares how its calls render in a UI (an editor's tool-call card) through two callbacks, `presentCall`/`presentResult` on `ToolDefinition`, returning `ToolCallPresentation` / `ToolResultPresentation` with an optional `ToolTerminal` sub-shape. These grew incrementally into a **bag of optional fields**: `title`, `kind`, `rawInput`, `content`, `locations`, `terminal` on the call; `title`, `content`, `terminal` on the result; `cwd`/`output`/`exitCode`/`signal` on `ToolTerminal`. The split of responsibility is muddy:
+
+- The call-side and result-side `terminal` fields overlap, and the bridge reconciles a `content` block AND a `terminal` block AND `rawInput` per call, stitching them together with ad-hoc conditionals.
+- Which combinations are *valid* is unwritten: a `terminal` call that also sets `content` means "description above the card"; a generic call that sets `terminal` is meaningless but representable. The type permits nonsense.
+- There is no way to express the one file-tool affordance an editor most wants — a **diff card** (`{path, oldText, newText}`, which Zed renders as an inline diff / new-file preview). `ToolCallPresentation.content` is the *LLM* `ContentBlock[]` vocabulary (text/image), so a tool literally cannot ask for a diff.
+
+The existing `FIXME(tool-presentation)` in `packages/core/tools/src/index.ts` named the fix: "redesign the type so a tool declares its render INTENT once (e.g. a tagged union over card kinds) rather than a bag of optional fields the bridge stitches together." The rejected RFC [Collapse tool-owned UI presentation](../../rejected/simplification/2026-06-20-generic-tool-rendering.md) deferred it explicitly: rich rendering "should return later as a tagged render-intent union after there are at least two real tools and two real consumers to validate the vocabulary." That bar is now met — two producer families (`dsh-tool-bash`, `dsh-tool-fs`) and two consumers (the ACP bridge live path + the snapshot-golden replay path).
+
+## Decision
+
+Replace the optional-field bag with a **`card`-tagged discriminated union**. A tool declares one render intent per call/result; the bridge switches on the tag.
+
+```ts ignore-check
+type FileLocation = { path: string; line?: number }
+type FileDiff = { path: string; oldText: string | null; newText: string } // oldText null ⇒ new file
+
+// presentCall → ToolCallView
+type ToolCallView = GenericCallView | TerminalCallView | DiffCallView
+interface GenericCallView { card: 'generic'; title: string; kind?: ToolCallKind; rawInput?: unknown; content?: ContentBlock[]; locations?: FileLocation[] }
+interface TerminalCallView { card: 'terminal'; title: string; description?: string; cwd?: string }
+interface DiffCallView { card: 'diff'; title: string; diffs: FileDiff[]; locations?: FileLocation[] }
+
+// presentResult → ToolResultView
+type ToolResultView = GenericResultView | TerminalResultView
+interface GenericResultView { card: 'generic'; title?: string; content?: ContentBlock[] }
+interface TerminalResultView { card: 'terminal'; title?: string; output?: string; exitCode?: number; signal?: string }
+```
+
+`card` is **required** on every variant — a real discriminant, not an optional default. The bridge does `switch (view.card) { case 'generic': … case 'terminal': … case 'diff': … default: assertNever(view) }`. The union is **closed** (per the [switch-exhaustiveness convention](../../../../AGENTS.md)): a fourth render intent (a table, a chart) needs new bridge code to render it anyway, so a plugin-added variant that the bridge silently drops would be worse than a compile error. Adding a variant breaks compilation at the bridge switch — exactly the signal we want.
+
+### Why a tagged union beats the field-bag
+
+- **Invalid states become unrepresentable.** A generic card cannot carry terminal output; a terminal card cannot carry a diff. The old bag permitted all of these.
+- **The bridge switches instead of stitching.** One arm per card kind, each producing exactly the wire shape that card needs, rather than reconciling five optional fields whose interactions are undocumented.
+- **`diff` is a first-class intent.** `dsh-tool-fs` write/edit declare `card:'diff'`; the bridge emits an ACP `{type:'diff', path, oldText, newText}` `ToolCallContent` (already in the SDK's `ToolCallContent` union, previously unused by the bridge). This is the affordance the redesign unlocks.
+
+### Producer mapping
+
+- `dsh-tool-fs` read → `generic` (`kind:'read'`, a follow-along `location`); write → `diff` (`oldText:null`); edit → `diff` (`oldText:old_string || null`, `newText:new_string ?? ''`). This mirrors `claude-agent-acp`'s `toolInfoFromToolUse` Read/Write/Edit arms field-for-field.
+- `dsh-tool-bash` foreground → `terminal` call + `terminal` result; `run_in_background` and `bash_output`/`bash_kill` → `generic`.
+- `dsh-tool-todo` → `generic`.
+
+### Terminal fallback ownership
+
+`TerminalResultView` carries only `output`/`exitCode`/`signal`. A UI without the terminal capability needs a fenced ` ```console ` text fallback; that derivation moves to the **bridge** (it wraps `output` in a fenced block on the no-capability path), rather than the tool double-encoding it. This keeps the bash tool's result a single structured shape and preserves the existing capability-gated behavior byte-for-byte.
+
+### Purity preserved
+
+`presentCall`/`presentResult` remain pure functions of `args` (+ the result for `presentResult`) — they run on live streaming AND session-log replay, so they must be replay-deterministic. Every view is derived from args alone: write's diff is new-file style (`oldText:null`) because the tool has no old content at call time; edit's diff is `old_string`→`new_string`.
+
+## Relative-path display titles
+
+`claude-agent-acp` relativizes a file card's title path against the session cwd (`toDisplayPath`) — `Read src/foo.ts`, not `/abs/proj/src/foo.ts` — while keeping `locations[]`/`diff.path` **raw** (the editor opens the real path). Our `presentCall` is pure/args-only and cannot see the session cwd, so this relativization happens at the **bridge**, which already threads the session cwd into tool-call rendering (the same cwd it uses to resolve a terminal card's header). The bridge relativizes the title only, by an exact structured replace of the known `locations[0].path`/`diffs[0].path` substring — generic over the file-card kinds, never special-casing tool names.
+
+## Non-goals
+
+- **Live incremental `terminal_output_delta` streaming** and **command classification** — the terminal-rendering RFC's own deferred follow-ups, untouched here.
+
+## Related
+
+- Supersedes the deferral in [Collapse tool-owned UI presentation](../../rejected/simplification/2026-06-20-generic-tool-rendering.md) (rejected — "wait for two real tools and two real consumers, then a tagged render-intent union"). That bar is now met; this is that union.
+- Extended by [Result-time applied-hunk diffs](2026-07-02-result-time-applied-hunk-diffs.md), which adds a persisted `meta` channel so write/edit emit a result-time `DiffResultView` — the applied change (a contextual hunk with context lines / one per `replace_all` site, or a whole-file diff for a create) — on top of this union's call-time diff card.
+- Folds `ToolTerminal` into the `terminal` views described by [ACP terminal and tool-call rendering](../feature/2026-06-18-acp-terminal-and-tool-rendering.md) (the `_meta` terminal-card convention and capability gate are unchanged; only the harness-side presentation type changes).
+- The ACP SDK's `Diff` / `ToolCallContent` types back the new `diff` card.

docs/rfc/implemented/process/2026-06-20-core-data-structures-catalog.md

@@ -23,7 +23,7 @@ The rule that settled the remaining cases: ***the type you write, hold, or recei
 - A data structure is **core** if it flows through the agent-loop spine — the loop holds, derives, streams, or logs it on every turn regardless of which plugins load (`Message`, `StreamChunk`, `SessionEvent`, the `Agent` handle) — **or** it is the single headline type a plugin author writes against a pipeline (`ToolDefinition`).
 - `ToolDefinition` is core (it is what every tool author writes) **even though the loop never holds one** — authoring-importance overrides the strict flows-through-spine rule for this one headline type. But its typing machinery — the `SchemaSpec`/`InferArgs` DSL — is a sub-page detail (you write a `ToolDefinition`; the type-level machinery that types it you do not). That is the spine-vs-seam line made sharp.
 - `ToolSchema` is core (it is a field of `GenerateOptions`, the model request that flows through every step) even though it is conceptually part of the tool pipeline — *flows through the spine* wins over *conceptual home* when they conflict.
-- The tool-presentation vocabulary (`ToolCallPresentation`, …, carrying a `FIXME(tool-presentation)` redesign marker), the `SessionPersistence` durability seam, and bash vocabulary are sub-pages.
+- The tool-presentation vocabulary (`ToolCallView`/`ToolResultView`, …), the `SessionPersistence` durability seam, and bash vocabulary are sub-pages.
 
 `core.md` is a **self-contained spine doc**: it states the exact type definition of each spine structure with minimal prose and links to sub-pages for the per-seam detail. The sub-pages are `llm-streaming.md`, `session.md`, `persistence.md` (split from session along the in-memory-model vs. durability-seam line), `tools.md`, and `bash.md`.
 

docs/rfc/implemented/process/2026-07-02-bilingual-docs-and-pairing-gate.i18n.yaml

@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write
+2026-07-02-bilingual-docs-and-pairing-gate.md: 517a6371eca5d747313c7efdb2756a50257701e4
+2026-07-02-bilingual-docs-and-pairing-gate.zh.md: f8f68bf5d4d7e6795318d9dd435a525f20a4f407

docs/rfc/implemented/process/2026-07-02-bilingual-docs-and-pairing-gate.md

@@ -0,0 +1,36 @@
+# Bilingual documentation via paired sibling files and a pairing gate
+
+English | [中文](2026-07-02-bilingual-docs-and-pairing-gate.zh.md)
+
+## Context
+
+This repo's README and docs tree are read by people and agents inside and outside the company, in both English and Chinese. Maintaining a second language by hand, with no mechanism, is how translations rot: one side moves on, the other silently lies, and no gate notices. The repo's standing answer to invariants of this kind is to encode them as a mechanical check (see [quality gates](2026-06-11-quality-gates.md) and [doc-sync enforcement](2026-06-11-doc-sync-enforcement.md)), so the bilingual policy ships with one.
+
+## Decision
+
+- **Paired sibling files with equal authority.** A documentation pair is three sibling files: English `foo.md`, Chinese `foo.zh.md`, and a consistency record `foo.i18n.yaml`. Neither language is canonical — a document may be authored and reviewed Chinese-first and translated to English afterwards, or the reverse; what binds the pair is that both sides must say the same thing, and pairs merge whole (both languages plus the record, never one alone). Policy: [docs/i18n/README.md](../../../i18n/README.md); translation rules: [docs/i18n/translation-rules.md](../../../i18n/translation-rules.md); terminology source of truth: [docs/i18n/terminology.md](../../../i18n/terminology.md).
+- **A sidecar record of both blob hashes makes consistency checkable.** `foo.i18n.yaml` holds the full git blob hash of each side as of the last confirmed-consistent state. An edit to either side without re-confirming the pair is then mechanically detectable as a pure content comparison — no history lookup — and the hashes are computable for files edited in the same PR, which a commit-hash record is not. Re-recording (`verify-translation-pairing --write`) produces a reviewable yaml diff: confirming consistency is an explicit, visible act in the PR.
+- **`verify-translation-pairing` joins `doc-sync`.** The gate ([scripts/verify-translation-pairing.ts](../../../../scripts/verify-translation-pairing.ts)) enforces: required pairs exist, every existing pair is complete (all three files) and consistent (both hashes match, switcher links both ways, structural signatures identical), and excluded (generated or bilingual-by-construction) files stay unpaired. The `required` list in [scripts/translation-pairing.manifest.json](../../../../scripts/translation-pairing.manifest.json) is a ratchet: each merged translation batch adds its files, so coverage only grows.
+- **Translation is agent work with human review.** The committed workflow is [.agents/skills/dsh-translate-docs](../../../../.agents/skills/dsh-translate-docs/SKILL.md), following the same pattern as [dsh-code-review](../../../../.agents/skills/dsh-code-review/SKILL.md): the skill carries the workflow and defers to the docs as sources of truth.
+
+## Alternatives considered
+
+- **English as the canonical source with a fingerprint inside the translation** — the design first proposed for this RFC: `.zh.md` files carried an HTML comment recording the English source's blob hash, and translation flowed EN → ZH only. Revised in review: the team wants Chinese-first authoring (write and review a Chinese RFC, then translate to English) with the two languages holding equal authority, which a one-directional canonical model cannot express. The sidecar record covering BOTH sides replaced the in-file one-directional fingerprint; the blob-hash mechanics survived unchanged.
+- **Locale directories (`docs/en/` + `docs/zh/`, the Kubernetes/ECharts model)** — rejected: this repo has no docs-site framework to map locales to routes, moving every English file would churn every existing cross-reference, and `verify-md-links`/`verify-doc-refs` would need path-mapping logic instead of working unchanged.
+- **A separate translation repo (the PingCAP `docs`/`docs-cn` model)** — rejected: right for a docs product with independent release trains, overkill for a monorepo's own documentation; it also puts the translation outside the reach of this repo's gates.
+- **Interleaved bilingual files (single file, both languages)** — rejected: doubles every diff, breaks the one-line-per-paragraph convention's diff ergonomics, and makes partial inconsistency invisible.
+- **Commit-hash records (the MDN `l10n.sourceCommit` model)** — rejected in favor of blob hashes: a same-PR edit has no commit hash yet, so the MDN model cannot express "consistent as of the state this PR introduces", and verifying it requires git history instead of file content.
+- **Comparing git timestamps of the pair (no record)** — rejected: formatting-only edits would false-positive, and a counterpart committed after an unrelated edit would false-negative; content identity is the only signal that means what the gate claims.
+
+## Industry precedent
+
+Paired sibling files with locale suffixes are the dominant Chinese big-tech convention (ant-design `index.zh-CN.md`/`index.en-US.md`; arco-design `README.zh-CN.md` with a top-of-file switcher; Apache ShardingSphere's 387 `.cn.md`/`.en.md` pairs) — but none of those repos *enforce* pairing or consistency in CI; the convention holds by review alone. Consistency automation exists outside China: MDN's `l10n.sourceCommit` front-matter fingerprint, Vue's Ryu-Cho action (upstream-commit watcher that opens issues/PRs for stale translations), Kubernetes' localization drift scripts, and Microsoft's Azure co-op-translator (source-hash-driven LLM re-translation in CI). This design combines the two: the Chinese-ecosystem file layout with a hash-pair gate, plus a committed agent skill in place of a bot service.
+
+## Consequences
+
+- Editing either side of a paired document obligates the same PR to update the counterpart and re-record the pair — the gate makes the doc-sync rule bilingual, and CI (not reviewer memory) carries the invariant.
+- Every pair adds a third file to the tree. The record is machine-written (`--write`), so the cost is directory noise, not maintenance effort; in exchange, "who confirmed these consistent, and when" is answerable from git blame on the yaml.
+- When the two sides disagree, no mechanical rule picks a winner — the PR review does. That is the price of equal authority, accepted deliberately: the alternative (a canonical language) forbids Chinese-first authoring.
+- Generated docs (`cordis-catalog/`, `tool-catalog/`, `module-graph.md`) are excluded for now; the planned follow-up is to teach their generators to emit Chinese alongside English, at which point they leave the exclusion list.
+- Rollout is incremental by design: documents outside `required` are visible backlog (`--list`), not red CI, so pairs land in reviewable batches without a big-bang PR.
+- The recorded hashes double as the update tool (`git cat-file -p <hash>` recovers either side's last-confirmed text for a minimal diff-based update), so re-translation of whole files is never forced by the mechanism.

docs/rfc/implemented/process/2026-07-02-bilingual-docs-and-pairing-gate.zh.md

@@ -0,0 +1,36 @@
+# 通过配对兄弟文件与配对门禁实现双语文档
+
+[English](2026-07-02-bilingual-docs-and-pairing-gate.md) | 中文
+
+## 背景
+
+本仓库的 README 与 docs 目录树会被公司内外的人和 agent（智能体）以中英两种语言阅读。没有机制、纯靠手工维护第二语言，正是译文腐烂的方式：一侧继续演进，另一侧默默地说谎，而没有门禁会注意到。对这类不变式，本仓库一贯的答案是把它编码成机械检查（见[质量门禁](2026-06-11-quality-gates.md)与 [doc-sync 强制](2026-06-11-doc-sync-enforcement.md)），因此双语政策随附一道门禁一起交付。
+
+## 决策
+
+- **配对兄弟文件，两种语言同权。**一对文档是三个兄弟文件：英文 `foo.md`、中文 `foo.zh.md`，加一份一致性记录 `foo.i18n.yaml`。没有哪种语言是正典——一篇文档可以先用中文撰写和评审、之后再译成英文，反之亦可；约束这对文件的是两侧必须说同样的话，且配对整体合入（两种语言加记录，绝不单独落一侧）。政策见 [docs/i18n/README.md](../../../i18n/README.md)；翻译规则见 [docs/i18n/translation-rules.md](../../../i18n/translation-rules.md)；术语真源见 [docs/i18n/terminology.md](../../../i18n/terminology.md)。
+- **旁挂记录两侧 blob hash，使一致性可检查。**`foo.i18n.yaml` 保存两侧文件在上一次确认一致状态下各自的完整 git blob hash。此后改了任一侧而没重新确认配对，都能被机械检测出来——纯内容比较、无需查询历史——而且同一个 PR 里改动的文件也能算出 hash，commit hash 式的记录做不到这一点。重新记录（`verify-translation-pairing --write`）产生一份可评审的 yaml diff：确认一致在 PR 里是一个显式、可见的动作。
+- **`verify-translation-pairing` 加入 `doc-sync`。**门禁（[scripts/verify-translation-pairing.ts](../../../../scripts/verify-translation-pairing.ts)）强制执行：required 的配对存在；任何已存在的配对完整（三个文件齐全）且一致（两个 hash 都匹配、切换行双向互链、结构签名一致）；被排除的文件（生成物或本身即双语的）保持不配对。[scripts/translation-pairing.manifest.json](../../../../scripts/translation-pairing.manifest.json) 中的 `required` 清单是一个棘轮：每个合入的翻译批次把自己的文件加进去，覆盖面只增不减。
+- **翻译是 agent 的工作，由人评审。**进仓的工作流是 [.agents/skills/dsh-translate-docs](../../../../.agents/skills/dsh-translate-docs/SKILL.md)，与 [dsh-code-review](../../../../.agents/skills/dsh-code-review/SKILL.md) 同一模式：skill 承载工作流，并把真源让给文档。
+
+## 曾考虑的替代方案
+
+- **英文为正典源、指纹放在译文内**——本 RFC 最初提出的设计：`.zh.md` 文件携带一条 HTML 注释记录英文源的 blob hash，翻译只沿 EN → ZH 单向流动。评审中修订：团队需要中文先行的撰写方式（先写、先审中文 RFC，再译英文），两种语言同权，而单向正典模型无法表达这一点。覆盖**两侧**的旁挂记录取代了文件内的单向指纹；blob hash 的机制原样保留。
+- **语言目录（`docs/en/` + `docs/zh/`，Kubernetes/ECharts 模式）**——否决：本仓库没有把 locale 映射到路由的文档站框架，挪动每个英文文件会搅动所有既有交叉引用，且 `verify-md-links`/`verify-doc-refs` 将需要路径映射逻辑而不是原样工作。
+- **独立翻译仓库（PingCAP `docs`/`docs-cn` 模式）**——否决：适合有独立发布节奏的文档产品，对 monorepo 自己的文档而言过重；还会把译文置于本仓库门禁够不到的地方。
+- **中英混排单文件（一个文件、两种语言）**——否决：每个 diff 都翻倍，破坏一段一行约定的 diff 工效，且局部不一致不可见。
+- **Commit hash 式记录（MDN `l10n.sourceCommit` 模式）**——否决，改用 blob hash：同一个 PR 内的改动还没有 commit hash，MDN 模式无法表达「与本 PR 引入的状态一致」，且校验它需要 git 历史而非文件内容。
+- **比较配对两侧的 git 时间戳（无记录）**——否决：纯格式化的改动会误报，一次无关改动之后提交的另一侧会漏报；只有内容同一性这个信号与门禁的承诺名实相符。
+
+## 业界先例
+
+带语言后缀的配对兄弟文件是中国大厂的主流约定（ant-design 的 `index.zh-CN.md`/`index.en-US.md`；arco-design 的 `README.zh-CN.md` 加顶部切换行；Apache ShardingSphere 的 387 对 `.cn.md`/`.en.md`）——但这些仓库都没有在 CI 里**强制**配对或一致性；约定纯靠评审维系。一致性自动化存在于中国之外：MDN 的 `l10n.sourceCommit` front-matter 指纹、Vue 的 Ryu-Cho action（监视上游 commit、为陈旧译文自动开 issue/PR）、Kubernetes 的本地化漂移脚本、微软 Azure co-op-translator（CI 中由源 hash 驱动的 LLM 重译）。本设计把两者结合：中文生态的文件布局，加 hash 对门禁，再加一个进仓 agent skill（技能）替代 bot 服务。
+
+## 后果
+
+- 修改已配对文档的任一侧，同一个 PR 就有义务更新另一侧并重新记录配对——门禁把 doc-sync 规则双语化，不变式由 CI（而非评审者的记忆）承载。
+- 每个配对给目录树多添一个文件。记录由机器写入（`--write`），代价是目录噪音而非维护负担；换来的是「谁在何时确认过这对一致」可以从 yaml 的 git blame 直接回答。
+- 两侧说法冲突时，没有机械规则裁决谁赢——由 PR 评审裁决。这是同权的代价，是有意接受的：另一个选项（正典语言）禁止中文先行撰写。
+- 生成文档（`cordis-catalog/`、`tool-catalog/`、`module-graph.md`）暂被排除；计划中的后续工作是让它们的生成器在输出英文的同时输出中文，届时移出排除清单。
+- 推进天然是渐进的：`required` 之外的文档是可见的 backlog（`--list`），不是红的 CI，因此配对按可评审的批次落地，无需一个巨型 PR。
+- 记录的 hash 兼作更新工具（`git cat-file -p <hash>` 能还原任一侧上次确认的文本，用于基于 diff 的最小更新），所以这套机制从不强迫整篇重译。

examples/acp-agent/tests/acp.snapshot.ts

@@ -52,6 +52,7 @@ const SCENARIOS: Scenario[] = [
   { name: 'reject-extra-dirs', hasModelTurn: false, recorded: false },
   { name: 'text-turn', hasModelTurn: true, recorded: true },
   { name: 'tool-call-turn', hasModelTurn: true, recorded: true },
+  { name: 'fs-terminal-card', hasModelTurn: true, recorded: true },
   { name: 'todo-plan', hasModelTurn: true, recorded: true },
   { name: 'workspace-edit', hasModelTurn: true, recorded: true },
   { name: 'fs-read', hasModelTurn: true, recorded: true },
@@ -59,6 +60,7 @@ const SCENARIOS: Scenario[] = [
   { name: 'fs-edit', hasModelTurn: true, recorded: true },
   { name: 'fs-write-overwrite', hasModelTurn: true, recorded: true },
   { name: 'fs-read-window', hasModelTurn: true, recorded: true },
+  { name: 'fs-policy-reject', hasModelTurn: true, recorded: true },
   { name: 'multi-turn', hasModelTurn: true, recorded: true },
   { name: 'error-finish', hasModelTurn: true, recorded: false },
   { name: 'cancel', hasModelTurn: true, recorded: false },

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examples/acp-agent/tests/snapshots/fs-edit/stdout.golden.jsonl

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examples/acp-agent/tests/snapshots/fs-policy-reject/input.json

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+}

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examples/acp-agent/tests/snapshots/fs-policy-reject/workspace/settings.txt

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examples/acp-agent/tests/snapshots/fs-read/stdout.golden.jsonl

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examples/acp-agent/tests/snapshots/fs-terminal-card/input.json

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+  ]
+}

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 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" to"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" reply"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" with"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" exactly"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" \""}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"D"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ONE"}}}}

package.json

@@ -31,6 +31,7 @@
     "verify-package-paths": "tsx scripts/verify-package-paths.ts",
     "verify-rfc-classification": "tsx scripts/verify-rfc-classification.ts",
     "verify-type-equiv": "tsx scripts/verify-type-equiv.ts",
+    "verify-translation-pairing": "tsx scripts/verify-translation-pairing.ts",
     "verify-node-next-types": "tsx scripts/verify-node-next-types.ts",
     "gen-cordis-catalog": "tsx scripts/gen-cordis-catalog.ts",
     "verify-cordis-catalog": "tsx scripts/gen-cordis-catalog.ts --check",
@@ -39,7 +40,7 @@
     "gen-module-graph": "tsx scripts/gen-module-graph.ts",
     "verify-module-graph": "tsx scripts/gen-module-graph.ts --check",
     "constraints": "tsx scripts/check-workspace-constraints.ts",
-    "doc-sync": "pnpm run doc-typecheck && pnpm run verify-cordis-catalog && pnpm run verify-tool-catalog && pnpm run verify-md-wrap && pnpm run verify-md-links && pnpm run verify-doc-refs && pnpm run verify-package-paths && pnpm run verify-rfc-classification && pnpm run verify-type-equiv",
+    "doc-sync": "pnpm run doc-typecheck && pnpm run verify-cordis-catalog && pnpm run verify-tool-catalog && pnpm run verify-md-wrap && pnpm run verify-md-links && pnpm run verify-doc-refs && pnpm run verify-package-paths && pnpm run verify-rfc-classification && pnpm run verify-type-equiv && pnpm run verify-translation-pairing",
     "hygiene": "pnpm run knip && pnpm run publint && pnpm run constraints && pnpm run verify-node-next-types",
     "demo:echo": "node --expose-internals --import tsx packages/ui/stdio-agent/src/bin.ts examples/echo-agent/cordis.yml",
     "demo:coding": "node --expose-internals --import tsx packages/ui/stdio-agent/src/bin.ts examples/coding-agent/cordis.yml",

packages/bash/tool-bash/README.md

@@ -34,7 +34,7 @@ The owning agent's session token (`session.header.id`) is stamped onto the task
 
 ## UI presentation
 
-These tools own how their calls render in a UI (an editor's tool-call card) via the `dsh-tools` `presentCall`/`presentResult` seam — a UI never special-cases tool names. For `bash`: the **title** is the exact `command` ("ls -la src") and `kind` is `execute` (terminal/run treatment), matching the reference ACP adapters (claude-agent-acp, codex-acp), which both use the bare command as an execute tool's title. The command is ALSO the **rawInput** for non-terminal UIs that render it (an execute-kind card hides rawInput — Zed shows it only for non-terminal tools — so the command must BE the title to be seen). The model-written `description` rides as a **content** text block shown ABOVE the card. (claude-agent-acp DROPS the description in terminal mode and shows only the card; surfacing it as a content block is a deliberate divergence — we keep the human summary visible alongside the card.) The completed output is wrapped in a fenced ` ```console ` block as the no-terminal-capability fallback — a UI-only affordance, so the model-facing result text stays unfenced. A FOREGROUND `bash` run also flags itself as a **terminal** (the neutral `terminal` field: `presentCall` sets a `cwd` from the model `workdir` when given — absolute as-is, relative for the UI bridge to resolve against the session cwd — else leaves it for the bridge to fill from the session cwd; `presentResult` carries the raw output plus the parsed `exitCode`/`signal`) so a capable client (Zed) renders a terminal card with an exit-status pill instead of the text block — see `packages/ui/acp` ("Terminal card"). A `run_in_background` call is NOT a terminal (it returns a task id immediately and never streams a terminal — poll with `bash_output`), and an `isError` result (spawn failure / abort) carries no exit pill (there is no real process exit); both render as the ordinary execute card / fenced text. `bash_output`/`bash_kill` present a task-scoped title ("Read output from background task bash-3" / "Kill background task bash-3") with the task id as rawInput. These methods are pure/display-only (they also run on `session/load` replay), and a malformed/older logged arg shape falls back to a generic presentation rather than throwing. See `packages/core/tools` ("Tool-owned UI presentation") and `packages/ui/acp` ("Terminal card" / "Tool-call presentation").
+These tools own how their calls render in a UI (an editor's tool-call card) via the `dsh-tools` `presentCall`/`presentResult` seam, each returning a `card`-tagged render intent — a UI never special-cases tool names. A FOREGROUND `bash` run declares a **terminal card**: `presentCall` returns `{ card: 'terminal', title, description?, cwd? }` — the **title** is the exact `command` ("ls -la src"), the model-written `description` rides along (rendered ABOVE the card), and `cwd` comes from the model `workdir` when given (absolute as-is, relative for the UI bridge to resolve against the session cwd; else left for the bridge to fill from the session cwd) — and `presentResult` returns `{ card: 'terminal', title?, output?, exitCode?, signal? }` carrying the raw output plus the parsed `exitCode`/`signal`, so a capable client (Zed) renders a terminal card with an exit-status pill. The result carries the raw `output`; the bridge DERIVES the ` ```console ` fenced fallback for a no-terminal-capability UI (the tool no longer encodes the fences itself), so the model-facing result text stays unfenced. A `run_in_background` call is NOT a terminal (it returns a task id immediately and never streams a terminal — poll with `bash_output`) and instead returns a **generic card** (`{ card: 'generic', title, kind: 'execute', rawInput: command, content: [description] }`); an `isError` result (spawn failure / abort) likewise returns a `generic` result view with no exit pill (there is no real process exit). `bash_output`/`bash_kill` return a `generic` card with a task-scoped title ("Read output from background task bash-3" / "Kill background task bash-3") and the task id as rawInput. These methods are pure/display-only (they also run on `session/load` replay), and a malformed/older logged arg shape falls back to a generic presentation rather than throwing. See `packages/core/tools` ("Tool-owned UI presentation") and `packages/ui/acp` ("Terminal card" / "Tool-call presentation").
 
 ## Background completion notices
 

packages/bash/tool-bash/src/index.ts

@@ -41,7 +41,7 @@
 import type { Context } from 'cordis'
 import { isAbsolute, resolve as resolvePath } from 'node:path'
 import { defineTool } from '@deepseek-ai/dsh-tools'
-import type { ToolCallPresentation, ToolResult, ToolResultPresentation } from '@deepseek-ai/dsh-tools'
+import type { GenericCallView, TerminalCallView, ToolResult, ToolResultView } from '@deepseek-ai/dsh-tools'
 import type { Agent } from '@deepseek-ai/dsh-agent'
 import { BashTaskId, OwnerToken } from '@deepseek-ai/dsh-bash'
 import type { BashRunResult, BashTask, CollectedOutput } from '@deepseek-ai/dsh-bash'
@@ -158,16 +158,26 @@ export function renderResult(result: BashRunResult): string {
  */
 type BashCallArgs = { command: string; description: string; workdir?: string; run_in_background?: boolean }
 
-function presentBashCall(args: BashCallArgs): ToolCallPresentation {
-  const base = {
-    title: args.command,
-    kind: 'execute' as const,
-    rawInput: args.command,
-    content: [{ type: 'text' as const, text: args.description }],
+function presentBashCall(args: BashCallArgs): GenericCallView | TerminalCallView {
+  // A background start is not an interactive terminal — a generic execute card
+  // with the command as rawInput and the description as a content block.
+  if (args.run_in_background === true) {
+    return {
+      card: 'generic',
+      title: args.command,
+      kind: 'execute',
+      rawInput: args.command,
+      content: [{ type: 'text', text: args.description }],
+    }
+  }
+  // A foreground run IS a terminal: the command titles the card, the description
+  // renders above it, and the cwd (when the model gave a workdir) heads it.
+  return {
+    card: 'terminal',
+    title: args.command,
+    description: args.description,
+    ...args.workdir !== undefined ? { cwd: args.workdir } : {},
   }
-  // A background start is not an interactive terminal — no terminal card.
-  if (args.run_in_background === true) return base
-  return { ...base, terminal: args.workdir !== undefined ? { cwd: args.workdir } : {} }
 }
 
 /**
@@ -186,21 +196,25 @@ function presentBashCall(args: BashCallArgs): ToolCallPresentation {
  * task-id ack, not a streamed run) and an `isError` result (a spawn failure or
  * abort — there is no real process exit to pill, and the body is an error
  * message, not `renderResult` output, so parsing it would be meaningless). Those
- * fall back to the fenced `content` block with no terminal metadata. The bridge's
- * orphan guard also drops a result terminal when the call wasn't terminal, so a
- * background call (not marked terminal in `presentBashCall`) is doubly safe.
- * A non-text result (unexpected for bash) falls through to `undefined`.
+ * return a `generic` result whose content is the fenced ```console block. A
+ * finished foreground run returns a `terminal` result carrying the RAW output
+ * and the parsed exit status; the BRIDGE derives the fenced fallback from
+ * `output` for a UI without terminal support, so the tool does not double-encode
+ * it. A non-text result (unexpected for bash) falls through to `undefined`.
  */
-function presentBashResult(args: unknown, result: ToolResult): ToolResultPresentation | undefined {
+function presentBashResult(args: unknown, result: ToolResult): ToolResultView | undefined {
   const block = result.content.length === 1 ? result.content[0] : undefined
   if (block === undefined || block.type !== 'text') return undefined
   const raw = block.text
-  const fenced = raw.replace(/\n+$/, '')
-  const content = [{ type: 'text' as const, text: `\`\`\`console\n${fenced}\n\`\`\`` }]
   const isBackground = typeof args === 'object' && args !== null && (args as { run_in_background?: unknown }).run_in_background === true
-  // No exit pill / terminal output for a background ack or an errored run.
-  if (isBackground || result.isError) return { content }
-  return { content, terminal: { output: raw, ...parseExitStatus(raw) } }
+  // A background ack or an errored run is not a real terminal exit: render the
+  // fenced ```console fallback as generic content (no exit pill).
+  if (isBackground || result.isError) {
+    return { card: 'generic', content: [{ type: 'text', text: `\`\`\`console\n${raw.replace(/\n+$/, '')}\n\`\`\`` }] }
+  }
+  // A finished foreground run: RAW output + parsed exit for the terminal card.
+  // The bridge derives the no-capability fenced fallback from `output`.
+  return { card: 'terminal', output: raw, ...parseExitStatus(raw) }
 }
 
 /**
@@ -237,8 +251,8 @@ function parseExitStatus(text: string): { exitCode: number } | { signal: string
 }
 
 /** Pending-state presentation for `bash_output`/`bash_kill` (background-task tools). */
-function presentTaskCall(verb: string, args: { task_id: string }): ToolCallPresentation {
-  return { title: `${verb} background task ${args.task_id}`, kind: 'execute', rawInput: args.task_id }
+function presentTaskCall(verb: string, args: { task_id: string }): GenericCallView {
+  return { card: 'generic', title: `${verb} background task ${args.task_id}`, kind: 'execute', rawInput: args.task_id }
 }
 
 /**

packages/bash/tool-bash/tests/tools.spec.ts

@@ -716,45 +716,40 @@ describe('status lines', () => {
 })
 
 describe('tool-owned UI presentation (presentCall / presentResult)', () => {
-  it('bash presentCall: title is the command, description as a content block, marks a terminal; workdir → cwd (absolute or relative, bridge resolves)', async () => {
+  it('bash presentCall: a foreground run is a terminal card (command title, description, workdir → cwd absolute or relative)', async () => {
     const ctx = await setup()
-    // No explicit workdir → the call still flags a terminal, but with no cwd (the
-    // UI bridge fills the session cwd it owns; the pure presenter can't see it).
-    // The command is the title (an execute card hides rawInput); the description
-    // rides as a content text block (shown above the terminal card).
+    // No explicit workdir → a terminal card with no cwd (the UI bridge fills the
+    // session cwd it owns; the pure presenter can't see it).
     expect(ctx.tools.get('bash')?.presentCall?.({ command: 'ls -la src', description: 'List files in src' }))
-      .toEqual({ title: 'ls -la src', kind: 'execute', rawInput: 'ls -la src', content: [{ type: 'text', text: 'List files in src' }], terminal: {} })
+      .toEqual({ card: 'terminal', title: 'ls -la src', description: 'List files in src' })
     // An ABSOLUTE workdir is surfaced verbatim as the terminal cwd header.
     expect(ctx.tools.get('bash')?.presentCall?.({ command: 'pwd', description: 'Print dir', workdir: '/tmp/x' }))
-      .toEqual({ title: 'pwd', kind: 'execute', rawInput: 'pwd', content: [{ type: 'text', text: 'Print dir' }], terminal: { cwd: '/tmp/x' } })
+      .toEqual({ card: 'terminal', title: 'pwd', description: 'Print dir', cwd: '/tmp/x' })
     // A RELATIVE workdir is passed through AS-IS (the bridge resolves it against
     // the session cwd, matching where execution runs) — not dropped.
     expect(ctx.tools.get('bash')?.presentCall?.({ command: 'pwd', description: 'Print dir', workdir: 'sub' }))
-      .toEqual({ title: 'pwd', kind: 'execute', rawInput: 'pwd', content: [{ type: 'text', text: 'Print dir' }], terminal: { cwd: 'sub' } })
+      .toEqual({ card: 'terminal', title: 'pwd', description: 'Print dir', cwd: 'sub' })
   })
 
-  it('bash presentResult: console-block content AND terminal.output (RAW newlines) + parsed exit code', async () => {
+  it('bash presentResult: a terminal result carries RAW output (newlines intact) + parsed exit code', async () => {
     const ctx = await setup()
     const present = ctx.tools.get('bash')!.presentResult!(
       { command: 'echo hi', description: 'echo' },
       { content: [{ type: 'text', text: 'hi\n[exit code: 0]\n\n' }], isError: false },
     )
-    // The fenced ```console content trims trailing blank lines for a tidy block;
-    // terminal.output keeps the RAW bytes (newlines intact) a terminal renderer
-    // needs; exitCode is parsed back from the [exit code: N] marker.
-    expect(present).toEqual({
-      content: [{ type: 'text', text: '```console\nhi\n[exit code: 0]\n```' }],
-      terminal: { output: 'hi\n[exit code: 0]\n\n', exitCode: 0 },
-    })
+    // A terminal result keeps the RAW bytes (newlines intact) a terminal renderer
+    // needs; the bridge derives the fenced fallback. exitCode is parsed back from
+    // the [exit code: N] marker.
+    expect(present).toEqual({ card: 'terminal', output: 'hi\n[exit code: 0]\n\n', exitCode: 0 })
   })
 
   it('bash presentResult: a non-zero exit and a signal kill parse into exitCode / signal', async () => {
     const ctx = await setup()
     const args = { command: 'x', description: 'x' }
     const nonzero = ctx.tools.get('bash')!.presentResult!(args, { content: [{ type: 'text', text: 'oops\n[exit code: 3]' }], isError: false })
-    expect(nonzero?.terminal).toEqual({ output: 'oops\n[exit code: 3]', exitCode: 3 })
+    expect(nonzero).toEqual({ card: 'terminal', output: 'oops\n[exit code: 3]', exitCode: 3 })
     const killed = ctx.tools.get('bash')!.presentResult!(args, { content: [{ type: 'text', text: 'gone\n[killed by signal: SIGKILL]' }], isError: false })
-    expect(killed?.terminal).toEqual({ output: 'gone\n[killed by signal: SIGKILL]', signal: 'SIGKILL' })
+    expect(killed).toEqual({ card: 'terminal', output: 'gone\n[killed by signal: SIGKILL]', signal: 'SIGKILL' })
   })
 
   it('bash presentResult exit parse is the inverse of renderResult markers (round-trip)', async () => {
@@ -779,7 +774,8 @@ describe('tool-owned UI presentation (presentCall / presentResult)', () => {
     for (const c of cases) {
       const rendered = renderResult(c.result)
       const out = present.presentResult!({ command: 'x', description: 'x' }, { content: [{ type: 'text', text: rendered }], isError: false })
-      const { output: _o, ...exit } = out?.terminal ?? {}
+      // Drop card + output; the remaining fields are the parsed exit.
+      const { card: _c, output: _o, ...exit } = out as { card: string; output?: string; exitCode?: number; signal?: string }
       expect(exit).toEqual(c.expect)
     }
   })
@@ -793,37 +789,35 @@ describe('tool-owned UI presentation (presentCall / presentResult)', () => {
     // the marker (renderResult always inserts one before a REAL marker), so this
     // no-trailing-newline body is NOT mistaken for a failure → exitCode 0.
     const out = ctx.tools.get('bash')!.presentResult!(args, { content: [{ type: 'text', text: '[exit code: 5]' }], isError: false })
-    expect(out?.terminal).toEqual({ output: '[exit code: 5]', exitCode: 0 })
+    expect(out).toEqual({ card: 'terminal', output: '[exit code: 5]', exitCode: 0 })
     // Same for a fake signal marker with no leading newline.
     const sig = ctx.tools.get('bash')!.presentResult!(args, { content: [{ type: 'text', text: '[killed by signal: SIGKILL]' }], isError: false })
-    expect(sig?.terminal).toEqual({ output: '[killed by signal: SIGKILL]', exitCode: 0 })
+    expect(sig).toEqual({ card: 'terminal', output: '[killed by signal: SIGKILL]', exitCode: 0 })
   })
 
-  it('bash presentCall/presentResult: a run_in_background call is NOT a terminal and its ack carries no exit pill', async () => {
+  it('bash presentCall/presentResult: a run_in_background call is a generic card and its ack carries no exit pill', async () => {
     const ctx = await setup()
-    // The background start returns a task-id ack, not a streamed run — no terminal.
+    // The background start returns a task-id ack, not a streamed run — a generic
+    // execute card with the command as rawInput and the description as content.
     const call = ctx.tools.get('bash')!.presentCall!({ command: 'sleep 100', description: 'wait', run_in_background: true })
-    expect(call).toEqual({ title: 'sleep 100', kind: 'execute', rawInput: 'sleep 100', content: [{ type: 'text', text: 'wait' }] })
-    expect((call as { terminal?: unknown }).terminal).toBeUndefined()
-    // The ack result is fenced text only — no terminal output / exit pill.
+    expect(call).toEqual({ card: 'generic', title: 'sleep 100', kind: 'execute', rawInput: 'sleep 100', content: [{ type: 'text', text: 'wait' }] })
+    // The ack result is a generic fenced-text card — no terminal output / exit pill.
     const result = ctx.tools.get('bash')!.presentResult!(
       { command: 'sleep 100', description: 'wait', run_in_background: true },
       { content: [{ type: 'text', text: 'started background task bash-1' }], isError: false },
     )
-    expect(result?.terminal).toBeUndefined()
-    expect(result?.content).toEqual([{ type: 'text', text: '```console\nstarted background task bash-1\n```' }])
+    expect(result).toEqual({ card: 'generic', content: [{ type: 'text', text: '```console\nstarted background task bash-1\n```' }] })
   })
 
-  it('bash presentResult: an isError result carries no exit pill (no real process exit to report)', async () => {
+  it('bash presentResult: an isError result is a generic card (no real process exit to report)', async () => {
     const ctx = await setup()
     // A spawn failure / abort has no process exit — the body is an error message,
-    // not renderResult output, so no terminal output/exit is emitted.
+    // not renderResult output, so a generic fenced card, no terminal output/exit.
     const out = ctx.tools.get('bash')!.presentResult!(
       { command: 'x', description: 'x' },
       { content: [{ type: 'text', text: 'command aborted' }], isError: true },
     )
-    expect(out?.terminal).toBeUndefined()
-    expect(out?.content).toEqual([{ type: 'text', text: '```console\ncommand aborted\n```' }])
+    expect(out).toEqual({ card: 'generic', content: [{ type: 'text', text: '```console\ncommand aborted\n```' }] })
   })
 
   it('bash presentResult: leaves a non-text (unexpected) result untouched → undefined (UI keeps raw content)', async () => {
@@ -849,9 +843,9 @@ describe('tool-owned UI presentation (presentCall / presentResult)', () => {
   it('bash_output / bash_kill presentCall: a readable task-scoped title, task id as rawInput', async () => {
     const ctx = await setup()
     expect(ctx.tools.get('bash_output')!.presentCall!({ task_id: 'bash-3' }))
-      .toEqual({ title: 'Read output from background task bash-3', kind: 'execute', rawInput: 'bash-3' })
+      .toEqual({ card: 'generic', title: 'Read output from background task bash-3', kind: 'execute', rawInput: 'bash-3' })
     expect(ctx.tools.get('bash_kill')!.presentCall!({ task_id: 'bash-3' }))
-      .toEqual({ title: 'Kill background task bash-3', kind: 'execute', rawInput: 'bash-3' })
+      .toEqual({ card: 'generic', title: 'Kill background task bash-3', kind: 'execute', rawInput: 'bash-3' })
   })
 
   it('presentCall validates softly: malformed args (missing required description) return undefined, never throw', async () => {

packages/core/agent-loop/src/loop.ts

@@ -724,6 +724,9 @@ async function runStep(
       content: result.content,
       isError: result.isError,
       ...result.error ? { error: result.error } : {},
+      // The tool's private presentation payload (e.g. a result-time diff),
+      // persisted so a UI bridge reproduces the card on replay.
+      ...result.meta !== undefined ? { meta: result.meta } : {},
     }, { surfaceOp: 'append', sourceEventSeqs: [callEvent.seq] })
     // signal CAN flip during the await above (abort() inside a tool);
     // the analyzer can't see through the await boundary.

packages/core/agent-loop/tests/loop.spec.ts

@@ -110,6 +110,32 @@ describe('agent loop', () => {
     expect(types).toContain('tool/result')
   })
 
+  it('threads a tool-attached meta (execute object return) onto the tool/result event', async () => {
+    const adapter = new MockAdapter([
+      toolCallResponse('c1', 'writer', { path: 'a.txt' }, 'writing'),
+      textResponse('done'),
+    ])
+    const ctx = await harness(adapter)
+    // A tool that returns the { content, meta } object form: the loop must
+    // persist `meta` on the tool/result event so a UI reproduces the card on replay.
+    ctx.tools.register(defineTool({
+      name: 'writer',
+      description: 'writes a file',
+      parameters: { path: { type: 'string' } },
+      async execute() {
+        return { content: [{ type: 'text', text: 'ok' }], meta: { diffs: [{ path: 'a.txt', oldText: null, newText: 'x' }] } }
+      },
+    }))
+    const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
+
+    send(agent, 'use the tool')
+    await waitForIdle(ctx, agent)
+
+    const toolResult = agent.session.events.find(e => e.type === 'tool/result')
+    expect(toolResult?.type === 'tool/result' && toolResult.data.meta)
+      .toEqual({ diffs: [{ path: 'a.txt', oldText: null, newText: 'x' }] })
+  })
+
   it('passes assembled system prompt and tool schemas into the request', async () => {
     const adapter = new MockAdapter([textResponse('ok')])
     const ctx = await harness(adapter)

packages/core/session/src/index.ts

@@ -16,6 +16,7 @@ import { SurfaceManager, isSurfaceEligibleType } from './surface.ts'
 
 export * from './types.ts'
 export { isJsonValue } from './json.ts'
+export type { JsonValue } from './json.ts'
 export { interruptedTurnClosers } from './repair.ts'
 export type { SurfaceNode } from './surface.ts'
 export { isSurfaceEvent, isSurfaceEligibleType } from './surface.ts'

packages/core/session/src/json.ts

@@ -13,6 +13,16 @@
  * @module @deepseek-ai/dsh-session/json
  */
 
+/**
+ * A value that round-trips losslessly through JSON: `null`, a boolean, a finite
+ * number, a string, an array of such values, or a plain object whose values are
+ * such values. The static type companion to {@link isJsonValue} (which validates
+ * the same shape at runtime). Use it to type a payload that must survive
+ * session-log persistence and replay byte-identically — e.g. a tool's private
+ * presentation `meta`.
+ */
+export type JsonValue = null | boolean | number | string | JsonValue[] | { [key: string]: JsonValue }
+
 /**
  * Whether `value` is losslessly JSON-serializable: only `null`, finite numbers,
  * booleans, strings, plain arrays, and plain objects of such values. Rejects

packages/core/session/src/types.ts

@@ -210,7 +210,16 @@ export interface SessionEventMap {
    */
   'assistant/message': { turn: number; step: number; content: ContentBlock[]; usage?: TokenUsage }
   'tool/call': { turn: number; step: number; callId: CallId; name: string; arguments: string }
-  'tool/result': { turn: number; step: number; callId: CallId; content: ContentBlock[]; isError: boolean; error?: { name: string; code: string } }
+  /**
+   * A completed tool call's model-facing result, plus an optional tool-private
+   * `meta` presentation payload. `meta` is opaque to the core (`unknown` — the
+   * producing tool owns its shape and reads it back in `presentResult`) but MUST
+   * be JSON-serializable: `Session.append` runtime-validates all event data with
+   * `isJsonValue`, so a non-serializable `meta` is rejected at the source, and the
+   * durable log reproduces the identical card on replay. Absent unless the tool
+   * attaches one (e.g. `dsh-tool-fs` carries its result-time contextual diff here).
+   */
+  'tool/result': { turn: number; step: number; callId: CallId; content: ContentBlock[]; isError: boolean; error?: { name: string; code: string }; meta?: unknown }
   /** Steering content injected between steps of a running turn. */
   'steering/message': { turn: number; content: ContentBlock[]; source: MessageSource }
   /**

packages/core/tools/README.md

@@ -24,10 +24,10 @@ Tool registry and execution waterfall. Tool plugins register their schemas and e
 
 ### Key types
 
-- `ToolDefinition` — `ToolSchema` + `execute(args, exec): Promise<ContentBlock[]>`, plus optional `presentCall(args)` / `presentResult(args, result)` for tool-owned UI presentation (see below).
+- `ToolDefinition` — `ToolSchema` + `execute(args, exec): Promise<ContentBlock[] | { content: ContentBlock[]; meta? }>` (the bare array is the model-facing content; the object form additionally attaches an opaque, JSON-serializable `meta` presentation payload persisted on the `tool/result` event and handed back to `presentResult`), plus optional `presentCall(args)` / `presentResult(args, result)` for tool-owned UI presentation (see below).
 - `ToolExecution` — one pending tool call: `{ callId, name, arguments, agent?, signal? }`.
-- `ToolExecutionResult` — outcome: `{ callId, content, isError, error? }`. On failure with a `HarnessError`, `error: { name, code }` carries the structured failure class alongside the model-facing text (the loop forwards it onto the `tool/result` session event for retry/sandbox plugins and replay).
-- `ToolCallPresentation` / `ToolResultPresentation` — provider-neutral shapes a tool returns from `presentCall` / `presentResult` to own how a UI renders ITS calls (see "Tool-owned UI presentation").
+- `ToolExecutionResult` — outcome: `{ callId, content, isError, error?, meta? }`. On failure with a `HarnessError`, `error: { name, code }` carries the structured failure class alongside the model-facing text. `meta` is the tool's opaque presentation payload from a successful `execute` (the object return form); the loop forwards both `error` and `meta` onto the `tool/result` session event (for retry/sandbox plugins, replay, and result-card rendering).
+- `ToolCallView` / `ToolResultView` — provider-neutral `card`-tagged render intents a tool returns from `presentCall` / `presentResult` to own how a UI renders ITS calls (see "Tool-owned UI presentation").
 
 ### Extension points
 
@@ -70,12 +70,18 @@ See `defineTool`, `validateArgs`, `ToolArgsError`, `SchemaSpec`, `InferArgs`, an
 
 ### Tool-owned UI presentation
 
-A tool owns how ITS calls render in a UI (an editor's tool-call card, a CLI log line) — a UI plugin must NOT special-case tool names. A `ToolDefinition` may declare two optional, pure, display-only methods:
+A tool owns how ITS calls render in a UI (an editor's tool-call card, a CLI log line) — a UI plugin must NOT special-case tool names. A `ToolDefinition` may declare two optional, pure, display-only methods that return a **`card`-tagged render intent** (a discriminated union — a tool declares its card kind once and a UI bridge switches on `card`):
 
-- `presentCall(args): ToolCallPresentation | undefined` — the PENDING state: a human-readable `title` (always-visible label), an optional `kind` (`read`/`edit`/`execute`/… for icon/treatment, default `other`), an optional `rawInput` (the salient input to show in a detail view — e.g. a shell command as a string, NOT the whole args object), an optional `content` (UI content shown alongside the title/card — e.g. a bash `description` as a text block above the terminal card), an optional `locations` (`{ path, line? }[]` — the files this call reads/modifies, so a capable UI can follow along / jump to them; the ACP bridge forwards them as `tool_call.locations`), and an optional `terminal` (a neutral `{ cwd? }` asking a capable UI to render this call as a TERMINAL, e.g. for `bash`).
-- `presentResult(args, result): ToolResultPresentation | undefined` — the COMPLETED state, given the same `args` and the `{ content, isError }` result: an optional replacement `title`, reformatted `content` (e.g. wrap command output in a fenced ` ```console ` block — a UI-only affordance that must NOT appear in the model-facing `execute` result), and an optional `terminal` (the `{ output?, exitCode?, signal? }` for a terminal-rendered call). The `ToolTerminal` shape is provider-neutral; a UI bridge (the ACP bridge) maps it to a terminal card (with an exit-status pill) and a UI that can't ignores it and uses `content`.
+- `presentCall(args): ToolCallView | undefined` — the PENDING state, one of:
+  - `{ card: 'generic', title, kind?, rawInput?, content?, locations? }` — the default card: a human-readable `title`, an optional `kind` (`read`/`edit`/`execute`/… for icon/treatment, default `other`), an optional `rawInput` (the salient input to show in a detail view — e.g. a background task id, NOT the whole args object), optional `content` (extra UI content blocks), and optional `locations` (`{ path, line? }[]` — files this call reads/modifies, so a capable UI can follow along; the ACP bridge forwards them as `tool_call.locations`).
+  - `{ card: 'terminal', title, description?, cwd? }` — a shell command: a capable UI renders a terminal card (the `title` is the command, `description` renders above it, `cwd` heads it); an incapable UI falls back to a generic execute card.
+  - `{ card: 'diff', title, diffs, locations? }` — a file create/modify: a capable UI renders an inline diff card from `diffs` (`{ path, oldText, newText }[]`; `oldText: null` for a new file). Used by `write`/`edit`.
+- `presentResult(args, result): ToolResultView | undefined` — the COMPLETED state, given the same `args` and the `{ content, isError, meta? }` result, one of:
+  - `{ card: 'generic', title?, content? }` — an optional replacement `title` and reformatted `content`.
+  - `{ card: 'terminal', title?, output?, exitCode?, signal? }` — a terminal run's captured `output` and exit status. A capable UI shows an exit-status pill; an incapable UI gets a fenced ` ```console ` fallback the BRIDGE derives from `output` (the tool does not encode the fences).
+  - `{ card: 'diff', title?, diffs }` — a completed file mutation as an inline diff. `diffs` is `FileDiff[]` — typically the applied hunks with surrounding context computed from the before/after content, or a whole-file diff (`oldText: null`) when there is no before-image (a file create). Used by `write`/`edit`; a `tool_call_update.content` replaces the call's content, so a mutation tool returns this even when it duplicates the call-time snippet (else the result text would clobber the pending diff).
 
-Returning `undefined` (or omitting a method) tells a UI to fall back to a generic presentation (title = tool name, raw args as input, raw result content). Both methods must be **pure and side-effect-free**: a UI may call them during live streaming AND during a session-log replay, so they depend only on their arguments. With `defineTool`, `args` is the typed `InferArgs<S>` shape; the helper soft-validates before calling (a malformed/older logged arg shape yields `undefined` rather than throwing, since display must never crash a replay). The shapes are provider-neutral — the ACP bridge (`dsh-acp`) maps them to ACP `tool_call`/`tool_call_update` wire fields, and `dsh-tool-bash` is the reference implementation.
+Returning `undefined` (or omitting a method) tells a UI to fall back to a generic presentation (title = tool name, raw args as input, raw result content). Both methods must be **pure and side-effect-free**: a UI may call them during live streaming AND during a session-log replay, so they depend only on their arguments. `result.meta` is the tool's own optional presentation payload (opaque `unknown`, JSON-serializable), attached by `execute` (see below) and persisted on the `tool/result` event, so a `presentResult` reading it stays replay-deterministic (the same `meta` is read back from the log). With `defineTool`, `args` is the typed `InferArgs<S>` shape; the helper soft-validates before calling (a malformed/older logged arg shape yields `undefined` rather than throwing, since display must never crash a replay). The views are provider-neutral — the ACP bridge (`dsh-acp`) maps each `card` to ACP `tool_call`/`tool_call_update` wire fields (a `diff` card to a `{ type: 'diff' }` content block, a `terminal` card to the `_meta` terminal convention), and relativizes a file card's title against the session cwd. See the render-intent-union RFC (`docs/rfc/implemented/architecture/2026-07-02-tool-render-intent-union.md`) and the applied-hunk-diffs RFC (`docs/rfc/implemented/architecture/2026-07-02-result-time-applied-hunk-diffs.md`); `dsh-tool-bash` (terminal) and `dsh-tool-fs` (diff/generic) are the reference implementations.
 
 ```ts
 import { defineTool } from '@deepseek-ai/dsh-tools'
@@ -90,13 +96,13 @@ const bash = defineTool({
   async execute(args) {
     return [{ type: 'text', text: `ran: ${args.command}` }]
   },
-  // The command is the readable title; the description rides as a content block.
-  presentCall: args => ({ title: args.command, kind: 'execute', rawInput: args.command, content: [{ type: 'text', text: args.description }] }),
-  // Wrap the output as a console block for the UI (not in the model-facing result).
+  // A terminal card: the command is the title, the description renders above it.
+  presentCall: args => ({ card: 'terminal', title: args.command, description: args.description }),
+  // A terminal result: the raw output + exit; the bridge derives the fenced fallback.
   presentResult: (_args, result) => {
     const block = result.content.length === 1 ? result.content[0] : undefined
     if (block === undefined || block.type !== 'text') return undefined
-    return { content: [{ type: 'text', text: '```console\n' + block.text + '\n```' }] }
+    return { card: 'terminal', output: block.text }
   },
 })
 ```

packages/core/tools/src/index.ts

@@ -12,6 +12,7 @@ import type { CallId, ContentBlock, ToolSchema } from '@deepseek-ai/dsh-llm'
 import { HarnessError } from '@deepseek-ai/dsh-llm'
 import type { Agent } from '@deepseek-ai/dsh-agent'
 import type {} from '@deepseek-ai/dsh-system-prompt'
+import type { ToolCallView, ToolResultView } from './presentation.ts'
 
 export {
   defineTool,
@@ -26,6 +27,23 @@ export {
   type JsonSchemaObject,
 } from './schema.ts'
 
+// The render-intent vocabulary a tool declares via `presentCall`/`presentResult`
+// lives in its own UI-facing module; re-export it so `@deepseek-ai/dsh-tools`
+// stays the single public surface for consumers (producers + the ACP bridge).
+export type {
+  ToolCallKind,
+  FileLocation,
+  FileDiff,
+  ToolCallView,
+  GenericCallView,
+  TerminalCallView,
+  DiffCallView,
+  ToolResultView,
+  GenericResultView,
+  TerminalResultView,
+  DiffResultView,
+} from './presentation.ts'
+
 declare module 'cordis' {
   interface Context {
     tools: ToolRegistry
@@ -55,157 +73,37 @@ declare module 'cordis' {
 // executes sequentially).
 
 /**
- * Category of a tool call, used by a UI to pick an icon / treatment. A neutral
- * vocabulary owned here (NOT an ACP type) so tools describe themselves without
- * depending on any client protocol; a UI bridge maps it to its own enum. The
- * member set mirrors the common ACP `ToolKind` values; `other` is the default.
+ * What a tool's `execute` returns. The bare {@link ContentBlock}`[]` form is the
+ * common case (model-facing content only); the object form additionally attaches
+ * a tool-private `meta` presentation payload that the registry threads onto the
+ * `tool/result` session event and hands back to the tool's `presentResult`.
+ * `meta` is opaque to the core (`unknown` — the tool owns and narrows its shape),
+ * and MUST be JSON-serializable: it persists on the durable log (the session
+ * enforces this at `append`), so replay reproduces the card.
  */
-export type ToolCallKind = 'read' | 'edit' | 'delete' | 'move' | 'search' | 'execute' | 'fetch' | 'other'
-
-// FIXME(tool-presentation): the ToolCallPresentation / ToolResultPresentation /
-// ToolTerminal shapes need a rethink. They grew incrementally (title/kind/
-// rawInput, then a `content` block, then a `terminal` sub-shape carrying cwd/
-// output/exit) and the split of responsibility is now muddy: the call vs result
-// terminal fields overlap, the bridge has to reconcile a `content` block AND a
-// `terminal` block AND `rawInput` per call, and the "pending vs completed"
-// boundary doesn't cleanly map to how editors actually render (terminal card,
-// diff, generic card). Before more tools/UIs depend on this, redesign the type
-// so a tool declares its render INTENT once (e.g. a tagged union over card
-// kinds) rather than a bag of optional fields the bridge stitches together.
-// Pin the design in an RFC and migrate dsh-tool-bash + the ACP bridge together.
-
-/**
- * How a tool wants ONE of its calls shown in a UI (an editor's tool-call card,
- * a CLI log line) BEFORE the result is known — the *pending* state. Provider-
- * neutral: a tool returns this from {@link ToolDefinition.presentCall} and a UI
- * plugin (e.g. the ACP bridge) maps it to its own wire shape. The tool owns its
- * own presentation — the UI must not special-case tool names.
- */
-export interface ToolCallPresentation {
-  /**
-   * Human-readable, always-visible label describing what THIS call does (e.g.
-   * the model-written one-line summary of a bash command). Keep it short — a UI
-   * shows it as a card header / log line. Required: a presentation must have a
-   * title (a UI falls back to the tool name only when `presentCall` is absent).
-   */
-  title: string
-  /** Category for icon/treatment; defaults to `other` when omitted. */
-  kind?: ToolCallKind
-  /**
-   * The salient input to surface in a detail/expanded view — e.g. the bash
-   * COMMAND itself (as a string), so the title can stay a readable summary
-   * while the exact command is still visible. Omit to show nothing; a string is
-   * rendered as-is, an object as pretty JSON. NOT the full raw args object
-   * unless that is genuinely what a reader wants.
-   */
-  rawInput?: unknown
-  /**
-   * UI-facing content to show on the PENDING call alongside the title/card —
-   * harness {@link ContentBlock}s, in render order. A terminal tool uses this to
-   * surface its human-readable `description` as a text block ABOVE the terminal
-   * card (the card itself is requested via {@link terminal} and labelled by the
-   * command in `title`), since the card has no description slot. Omit to show no
-   * extra content. A UI maps these to its own content blocks and renders a
-   * {@link terminal} block (if any) as a terminal card.
-   */
-  content?: ContentBlock[]
-  /**
-   * Files this call reads or modifies, so a capable UI can "follow along" —
-   * highlight or jump to the file (and line) as the tool runs. Provider-neutral
-   * `{ path, line? }` pairs; a UI bridge maps them to its own affordance (the ACP
-   * bridge forwards them as `tool_call.locations`). `path` is what the tool
-   * operated on (the model-facing path); `line` is an optional 1-based line to
-   * focus (e.g. a read's offset). Omit for a call that touches no file (e.g.
-   * `bash`).
-   */
-  locations?: { path: string; line?: number }[]
-  /**
-   * Ask a capable UI to render this call as a TERMINAL (a command running in a
-   * working directory), not a generic tool card — set by a tool whose call IS a
-   * shell command (e.g. `bash`). Provider-neutral; a UI bridge maps it to its
-   * own terminal affordance and a UI that can't falls back to the normal card.
-   * Pair with {@link ToolResultPresentation.terminal} for the output/exit.
-   */
-  terminal?: ToolTerminal
-}
-
-/**
- * A request to render a tool call as a terminal. The pending presentation
- * supplies the working directory; the result presentation (see
- * {@link ToolResultPresentation.terminal}) supplies the captured output and exit
- * status. Provider-neutral — no client-protocol types. A UI that supports
- * terminals shows a cwd-headed terminal card with the command, its output, and
- * an exit-status pill; a UI that does not ignores this and renders the ordinary
- * card/content.
- */
-export interface ToolTerminal {
-  /**
-   * Working directory the command ran in, shown as the terminal header. An
-   * ABSOLUTE path is used as-is; a RELATIVE path is resolved by the UI bridge
-   * against the session workspace (the pure tool presenter can't see the
-   * session cwd). Omit entirely to let the bridge use the session workspace.
-   */
-  cwd?: string
-  /** Captured command output (stdout+stderr as the tool chooses to combine them). Result-state only. */
-  output?: string
-  /**
-   * Process exit code, when the run ended by exiting (not a signal). Result-state
-   * only; lets a capable UI show an exit-status pill on the terminal card. Omit
-   * when the command was killed by a signal or the exit code is unknown.
-   */
-  exitCode?: number
-  /**
-   * Signal name that killed the process (e.g. `SIGTERM`), when it died by signal
-   * rather than exiting. Result-state only; mutually exclusive with `exitCode`.
-   */
-  signal?: string
-}
-
-/**
- * How a tool wants the COMPLETED call shown — the *result* state, after
- * `execute` returns. Lets the tool reformat its result for a UI distinctly from
- * the model-facing text it returned from `execute` (e.g. wrap command output in
- * a fenced ```console block for monospace rendering, which the model-facing
- * result must NOT carry). All fields optional: a UI keeps the pending-state
- * title and renders the raw result content for anything left unset.
- */
-export interface ToolResultPresentation {
-  /** Replacement title for the completed call (e.g. append an exit status). Omit to keep the pending-state title. */
-  title?: string
-  /**
-   * UI-facing result content (harness {@link ContentBlock}s), reformatted from
-   * the model-facing result. Omit to let the UI render the raw result content.
-   * Stays in harness vocabulary; the UI maps these to its own content blocks.
-   */
-  content?: ContentBlock[]
-  /**
-   * Terminal output/exit for a call the pending presentation marked as a
-   * terminal (see {@link ToolCallPresentation.terminal}). A capable UI renders
-   * `output` in the terminal card and shows the exit status; an incapable UI
-   * uses `content` (the tool should supply a text fallback there too).
-   */
-  terminal?: ToolTerminal
-}
+export type ToolExecuteReturn = ContentBlock[] | { content: ContentBlock[]; meta?: unknown }
 
 /** A registered tool: its schema plus the execution function. */
 export interface ToolDefinition extends ToolSchema {
-  execute(args: unknown, exec: ToolExecution): Promise<ContentBlock[]>
+  execute(args: unknown, exec: ToolExecution): Promise<ToolExecuteReturn>
   /**
-   * Optional: how to present the PENDING state of one call in a UI, derived
-   * from the call's `args` (parsed arguments, `unknown` — the tool validates/
-   * narrows its own input). Returning `undefined` (or omitting the method) tells
-   * a UI to fall back to a generic presentation (title = tool name, raw args as
-   * input). Pure and side-effect-free: a UI may call it during live streaming
-   * AND a session-log replay, so it must depend only on `args`.
+   * Optional: how to present the PENDING state of one call in a UI, derived from
+   * the call's `args` (parsed arguments, `unknown` — the tool validates/narrows
+   * its own input). Returns a {@link ToolCallView} (a `card`-tagged render intent),
+   * or `undefined` (or omit the method) to fall back to a generic presentation
+   * (title = tool name, raw args as input). Pure and side-effect-free: a UI may
+   * call it during live streaming AND a session-log replay, so it must depend
+   * only on `args`.
    */
-  presentCall?(args: unknown): ToolCallPresentation | undefined
+  presentCall?(args: unknown): ToolCallView | undefined
   /**
    * Optional: how to present the COMPLETED state, given the same `args` and the
-   * `result` (`execute`'s content + whether it errored). Returning `undefined`
-   * (or omitting the method) tells a UI to keep the pending title and render the
-   * raw result content. Pure and side-effect-free for the same replay reason.
+   * `result` (`execute`'s content + whether it errored). Returns a
+   * {@link ToolResultView}, or `undefined` (or omit the method) to keep the
+   * pending title and render the raw result content. Pure and side-effect-free
+   * for the same replay reason.
    */
-  presentResult?(args: unknown, result: ToolResult): ToolResultPresentation | undefined
+  presentResult?(args: unknown, result: ToolResult): ToolResultView | undefined
 }
 
 /** The completed outcome handed to {@link ToolDefinition.presentResult}. */
@@ -214,6 +112,13 @@ export interface ToolResult {
   content: ContentBlock[]
   /** Whether the call failed. */
   isError: boolean
+  /**
+   * The tool-private presentation payload the tool attached from `execute` (via
+   * the object return form), threaded verbatim from the `tool/result` event.
+   * Opaque (`unknown`); the tool narrows it back to its own shape. Absent when
+   * the tool attached none.
+   */
+  meta?: unknown
 }
 
 /** One pending tool call, as it flows through the execution waterfall. */
@@ -257,6 +162,13 @@ export interface ToolExecutionResult {
    * text in `content` is always present; this is extra structure for code.
    */
   error?: ToolErrorInfo
+  /**
+   * The tool-private presentation payload from a successful `execute` (the object
+   * return form). Threaded onto the `tool/result` session event and back into
+   * {@link ToolResult} for `presentResult`. Opaque (`unknown`); absent when the
+   * tool attached none or the call failed.
+   */
+  meta?: unknown
 }
 
 /**
@@ -361,8 +273,13 @@ export class ToolRegistry extends Service {
           // Unknown tool routes through the same catch as a tool-thrown error, so
           // both failure classes get structured `{ name, code }` from one path.
           if (!tool) throw new ToolNotFoundError(exec.name)
-          const content = await tool.execute(exec.arguments, exec)
-          return { callId: exec.callId, content, isError: false }
+          // Normalize the two `execute` return shapes: a bare ContentBlock[] (no
+          // meta) or a { content, meta } object (a tool attaching a private
+          // presentation payload). An array IS the content; the object carries it.
+          const returned = await tool.execute(exec.arguments, exec)
+          const content = Array.isArray(returned) ? returned : returned.content
+          const meta = Array.isArray(returned) ? undefined : returned.meta
+          return { callId: exec.callId, content, isError: false, ...meta !== undefined ? { meta } : {} }
         } catch (error: unknown) {
           return toolErrorResult(exec.callId, error)
         }

packages/core/tools/src/presentation.ts

@@ -0,0 +1,206 @@
+/**
+ * Tool render-intent vocabulary: the provider-neutral types a tool declares via
+ * `ToolDefinition.presentCall`/`ToolDefinition.presentResult` to say
+ * how ONE of its calls renders in a UI (an editor's tool-call card, a CLI log
+ * line). A UI bridge switches on the `card` tag to map each intent to its own
+ * wire shape, so a UI never special-cases tool names.
+ *
+ * This is the UI-facing surface of `dsh-tools`, kept separate from the registry
+ * and execution core in `index.ts`: this module owns ONLY presentation
+ * vocabulary and references none of the execution types, so the dependency runs
+ * one way (`index.ts` imports these views for the `ToolDefinition` method
+ * signatures). The opaque `meta` presentation channel is execution plumbing and
+ * lives with the registry in `index.ts`, not here.
+ *
+ * See the render-intent-union RFC
+ * (docs/rfc/implemented/architecture/2026-07-02-tool-render-intent-union.md).
+ *
+ * @module @deepseek-ai/dsh-tools/src/presentation
+ */
+
+import type { ContentBlock } from '@deepseek-ai/dsh-llm'
+
+/**
+ * Category of a tool call, used by a UI to pick an icon / treatment. A neutral
+ * vocabulary owned here (NOT an ACP type) so tools describe themselves without
+ * depending on any client protocol; a UI bridge maps it to its own enum. The
+ * member set mirrors the common ACP `ToolKind` values; `other` is the default.
+ */
+export type ToolCallKind = 'read' | 'edit' | 'delete' | 'move' | 'search' | 'execute' | 'fetch' | 'other'
+
+/**
+ * A file location a tool reads or modifies, so a capable UI can "follow along" —
+ * highlight or jump to the file (and line) as the tool runs. Provider-neutral;
+ * a UI bridge maps it to its own affordance (the ACP bridge forwards it as
+ * `tool_call.locations`). `path` is what the tool operated on (the model-facing
+ * path); `line` is an optional 1-based line to focus (e.g. a read's offset).
+ */
+export interface FileLocation {
+  path: string
+  line?: number
+}
+
+/**
+ * A single-file change a tool is about to make, for a UI that renders inline
+ * diffs (an editor's diff card). Provider-neutral; the ACP bridge forwards it as
+ * a `{ type: 'diff' }` tool-call content block. `oldText` is `null` for a
+ * new-file create (nothing to diff against); an overwrite also uses `null`,
+ * because a call-time presenter has no access to the file's prior content.
+ */
+export interface FileDiff {
+  path: string
+  /** Prior content, or `null` for a new file / an overwrite (no prior content available at call time). */
+  oldText: string | null
+  /** Content after the change. */
+  newText: string
+}
+
+/**
+ * How a tool wants ONE of its calls shown in a UI (an editor's tool-call card, a
+ * CLI log line) BEFORE the result is known — the *pending* state. A `card`-tagged
+ * discriminated union: a tool declares its render INTENT once and a UI bridge
+ * switches on `card` to map it to the bridge's own wire shape. Provider-neutral —
+ * the tool owns its presentation, so a UI never special-cases tool names.
+ *
+ * Returned by `ToolDefinition.presentCall`. See the render-intent-union
+ * RFC (docs/rfc/implemented/architecture/2026-07-02-tool-render-intent-union.md).
+ */
+export type ToolCallView = GenericCallView | TerminalCallView | DiffCallView
+
+/**
+ * The default card: a titled tool-call row with an optional category icon, a
+ * salient raw input, extra content blocks, and follow-along file locations. Any
+ * tool whose call is not a terminal or a diff uses this.
+ */
+export interface GenericCallView {
+  card: 'generic'
+  /**
+   * Human-readable, always-visible label describing what THIS call does. Keep it
+   * short — a UI shows it as a card header / log line.
+   */
+  title: string
+  /** Category for icon/treatment; defaults to `other` when omitted. */
+  kind?: ToolCallKind
+  /**
+   * The salient input to surface in a detail/expanded view (e.g. a background
+   * task id). Omit to show nothing; a string renders as-is, an object as pretty
+   * JSON. NOT the full raw args object unless that is genuinely what a reader wants.
+   */
+  rawInput?: unknown
+  /**
+   * UI-facing content blocks to show on the pending call alongside the title.
+   * Omit to show none. A UI maps these to its own content blocks.
+   */
+  content?: ContentBlock[]
+  /** Files this call reads/modifies, for editor follow-along. Omit for a call that touches no file. */
+  locations?: FileLocation[]
+}
+
+/**
+ * A call that IS a shell command running in a working directory: a capable UI
+ * renders it as a terminal card (cwd-headed, with the command as the title and
+ * live/afterward output from the {@link TerminalResultView}); an incapable UI
+ * falls back to a generic card whose body is the fenced command output. Set by a
+ * tool whose call is a foreground command (e.g. `bash`).
+ */
+export interface TerminalCallView {
+  card: 'terminal'
+  /** The command, shown as the terminal card's title / header line. */
+  title: string
+  /**
+   * A human-readable one-line summary of what the command does, rendered ABOVE
+   * the terminal card (the card itself has no description slot). Omit for none.
+   */
+  description?: string
+  /**
+   * Working directory the command runs in, shown as the terminal header. An
+   * ABSOLUTE path is used as-is; a RELATIVE path is resolved by the UI bridge
+   * against the session workspace (the pure presenter can't see the session cwd).
+   * Omit entirely to let the bridge use the session workspace.
+   */
+  cwd?: string
+}
+
+/**
+ * A call that creates or modifies files, rendered as an inline diff card by a
+ * capable UI. Set by a tool whose call writes/edits a file (e.g. `write`,
+ * `edit`). The diffs are derived from the call ARGUMENTS (a create's `oldText` is
+ * `null`); the tool emits a separate {@link DiffResultView} after `execute` — the
+ * applied change (an edit/overwrite hunk with context, or a whole-file diff for a
+ * create).
+ */
+export interface DiffCallView {
+  card: 'diff'
+  /** Card header (e.g. `Write foo.txt`). */
+  title: string
+  /** One entry per file the call changes. */
+  diffs: FileDiff[]
+  /** Files this call modifies, for editor follow-along (usually the diffs' paths). */
+  locations?: FileLocation[]
+}
+
+/**
+ * How a tool wants the COMPLETED call shown — the *result* state, after `execute`
+ * returns. A `card`-tagged union mirroring {@link ToolCallView}: a UI switches on
+ * `card`. Lets the tool reformat its result for a UI distinctly from the
+ * model-facing text it returned from `execute`. Returned by
+ * `ToolDefinition.presentResult`; omitting the method keeps the pending
+ * title and renders the raw result content.
+ */
+export type ToolResultView = GenericResultView | TerminalResultView | DiffResultView
+
+/**
+ * The default completed card: an optional replacement title and reformatted
+ * content. Omit a field to keep the pending title / render the raw result content.
+ */
+export interface GenericResultView {
+  card: 'generic'
+  /** Replacement title for the completed call. Omit to keep the pending-state title. */
+  title?: string
+  /**
+   * UI-facing result content (harness {@link ContentBlock}s), reformatted from
+   * the model-facing result. Omit to let the UI render the raw result content.
+   */
+  content?: ContentBlock[]
+}
+
+/**
+ * The completed state of a {@link TerminalCallView}: the captured output and exit
+ * status. A capable UI renders `output` in the terminal card and shows an
+ * exit-status pill; an incapable UI gets a fenced ```console fallback the BRIDGE
+ * derives from `output` (the tool does not double-encode it).
+ */
+export interface TerminalResultView {
+  card: 'terminal'
+  /** Replacement title for the completed call. Omit to keep the pending-state title. */
+  title?: string
+  /** Captured command output (stdout+stderr as the tool chooses to combine them). */
+  output?: string
+  /**
+   * Process exit code, when the run ended by exiting (not a signal). Lets a
+   * capable UI show an exit-status pill. Omit when killed by a signal or unknown.
+   */
+  exitCode?: number
+  /** Signal name that killed the process (e.g. `SIGTERM`). Mutually exclusive with `exitCode`. */
+  signal?: string
+}
+
+/**
+ * A completed file mutation rendered as an inline diff card, the *result-time*
+ * analogue of {@link DiffCallView}. Set by a tool whose `execute` applied a file
+ * change (e.g. `write`, `edit`): `diffs` are the change to show — typically the
+ * APPLIED hunks computed from the before/after content (one entry per hunk, each
+ * with surrounding context lines), so the editor shows the real change in place;
+ * a tool with no before-image (e.g. a file create) may instead give a whole-file
+ * diff (`oldText: null`). A `tool_call_update`'s content REPLACES the call's
+ * content in an editor, so a mutation tool returns this even when it duplicates
+ * the call-time snippet — otherwise the model-facing result text would replace
+ * (clobber) the pending diff card.
+ */
+export interface DiffResultView {
+  card: 'diff'
+  /** Replacement title for the completed call. Omit to keep the pending-state title. */
+  title?: string
+  /** The change to show, in file order — applied contextual hunks, or a whole-file diff when there is no before-image. */
+  diffs: FileDiff[]
+}

packages/core/tools/src/schema.ts

@@ -19,9 +19,9 @@
  * @module dsh-tools/schema
  */
 
-import type { ContentBlock } from '@deepseek-ai/dsh-llm'
 import { assertNever, HarnessError } from '@deepseek-ai/dsh-llm'
-import type { ToolCallPresentation, ToolDefinition, ToolExecution, ToolResult, ToolResultPresentation } from './index.ts'
+import type { ToolDefinition, ToolExecuteReturn, ToolExecution, ToolResult } from './index.ts'
+import type { ToolCallView, ToolResultView } from './presentation.ts'
 
 // ---------------------------------------------------------------------------
 // SchemaSpec — the author-facing per-property type
@@ -291,25 +291,27 @@ export interface DefineToolOptions<S extends SchemaSpec> {
   parameters: S
   /**
    * Tool execution function. `args` is typed as {@link InferArgs<S>} — zero
-   * casts needed.
+   * casts needed. Returns either a bare {@link ContentBlock}`[]` (model-facing
+   * content only) or a `{ content, meta }` object to also attach a tool-private
+   * presentation payload (see {@link ToolExecuteReturn}).
    */
-  execute(args: InferArgs<S>, exec: ToolExecution): Promise<ContentBlock[]>
+  execute(args: InferArgs<S>, exec: ToolExecution): Promise<ToolExecuteReturn>
   /**
    * Optional: how to present the PENDING state of one call in a UI (an editor
    * tool-call card, a CLI log line). `args` is the typed, schema-validated
    * argument shape — zero casts. Pure and side-effect-free: a UI may call it
    * during live streaming AND a session-log replay, so depend only on `args`.
    * The tool owns its presentation so a UI never special-cases tool names. See
-   * {@link ToolCallPresentation}.
+   * {@link ToolCallView}.
    */
-  presentCall?(args: InferArgs<S>): ToolCallPresentation | undefined
+  presentCall?(args: InferArgs<S>): ToolCallView | undefined
   /**
    * Optional: how to present the COMPLETED state, given the typed `args` and the
    * `result`. Use it to reformat result content for a UI distinctly from the
    * model-facing text (e.g. a fenced ```console block). Pure and side-effect-
-   * free for the same replay reason. See {@link ToolResultPresentation}.
+   * free for the same replay reason. See {@link ToolResultView}.
    */
-  presentResult?(args: InferArgs<S>, result: ToolResult): ToolResultPresentation | undefined
+  presentResult?(args: InferArgs<S>, result: ToolResult): ToolResultView | undefined
   /** Whether the tool requires structured output (default false). */
   strict?: boolean
 }
@@ -354,7 +356,7 @@ export function defineTool<S extends SchemaSpec>(options: DefineToolOptions<S>):
     description: options.description,
     parameters: schemaSpecToJsonSchema(options.parameters) as unknown as Record<string, unknown>,
     ...options.strict !== undefined ? { strict: options.strict } : {},
-    async execute(args: unknown, exec: ToolExecution): Promise<ContentBlock[]> {
+    async execute(args: unknown, exec: ToolExecution): Promise<ToolExecuteReturn> {
       // Validate the model-generated args before the typed body runs. On
       // mismatch we throw ToolArgsError; the registry turns it into an
       // isError result so the model can self-correct. After this guard, the
@@ -369,13 +371,13 @@ export function defineTool<S extends SchemaSpec>(options: DefineToolOptions<S>):
   // fall back to `undefined` (a generic UI presentation) on any mismatch, rather
   // than the hard `ToolArgsError` the execute path raises.
   if (userPresentCall) {
-    tool.presentCall = (args: unknown): ToolCallPresentation | undefined => {
+    tool.presentCall = (args: unknown): ToolCallView | undefined => {
       if (validateArgs(options.parameters, args).length > 0) return undefined
       return userPresentCall(args as InferArgs<S>)
     }
   }
   if (userPresentResult) {
-    tool.presentResult = (args: unknown, result: ToolResult): ToolResultPresentation | undefined => {
+    tool.presentResult = (args: unknown, result: ToolResult): ToolResultView | undefined => {
       if (validateArgs(options.parameters, args).length > 0) return undefined
       return userPresentResult(args as InferArgs<S>, result)
     }

packages/core/tools/tests/tools.spec.ts

@@ -52,8 +52,8 @@ describe('ToolRegistry', () => {
       description: 'has presenters',
       parameters: { x: { type: 'string', required: true } },
       async execute() { return [] },
-      presentCall: args => ({ title: args.x }),
-      presentResult: (args, result) => ({ title: args.x, content: result.content }),
+      presentCall: args => ({ card: 'generic', title: args.x }),
+      presentResult: (args, result) => ({ card: 'generic', title: args.x, content: result.content }),
     }))
     const schema = ctx.tools.schemas()[0] as unknown as Record<string, unknown>
     expect(Object.keys(schema).sort()).toEqual(['description', 'name', 'parameters'])
@@ -81,6 +81,38 @@ describe('ToolRegistry', () => {
     expect(result).toEqual({ callId: CallId('c1'), content: [{ type: 'text', text: 'hi' }], isError: false })
   })
 
+  it('threads a tool-attached meta (object return form) onto the result', async () => {
+    const ctx = await setup()
+    ctx.tools.register({
+      ...echoTool,
+      name: 'meta-tool',
+      async execute() {
+        return { content: [{ type: 'text', text: 'ok' }], meta: { diffs: [{ path: 'a', oldText: null, newText: 'x' }] } }
+      },
+    })
+    const result = await ctx.tools.execute({ callId: CallId('c1'), name: 'meta-tool', arguments: {} })
+    expect(result).toEqual({
+      callId: CallId('c1'),
+      content: [{ type: 'text', text: 'ok' }],
+      isError: false,
+      meta: { diffs: [{ path: 'a', oldText: null, newText: 'x' }] },
+    })
+  })
+
+  it('omits meta when the object return form supplies none', async () => {
+    const ctx = await setup()
+    ctx.tools.register({
+      ...echoTool,
+      name: 'no-meta-tool',
+      async execute() {
+        return { content: [{ type: 'text', text: 'ok' }] }
+      },
+    })
+    const result = await ctx.tools.execute({ callId: CallId('c1'), name: 'no-meta-tool', arguments: {} })
+    expect(result).toEqual({ callId: CallId('c1'), content: [{ type: 'text', text: 'ok' }], isError: false })
+    expect('meta' in result).toBe(false)
+  })
+
   it('returns isError results for unknown tools and throwing tools', async () => {
     const ctx = await setup()
     ctx.tools.register({
@@ -906,15 +938,15 @@ describe('defineTool presentation (presentCall / presentResult)', () => {
       presentCall(args) {
         // args is typed { path: string; n?: number } — zero casts.
         expectTypeOf(args).toEqualTypeOf<{ path: string; n?: number }>()
-        return { title: `Open ${args.path}`, kind: 'read', rawInput: args.path }
+        return { card: 'generic', title: `Open ${args.path}`, kind: 'read', rawInput: args.path }
       },
       presentResult(args, result) {
-        return { title: `Opened ${args.path}`, content: result.content }
+        return { card: 'generic', title: `Opened ${args.path}`, content: result.content }
       },
     })
-    expect(tool.presentCall!({ path: '/a', n: 2 })).toEqual({ title: 'Open /a', kind: 'read', rawInput: '/a' })
+    expect(tool.presentCall!({ path: '/a', n: 2 })).toEqual({ card: 'generic', title: 'Open /a', kind: 'read', rawInput: '/a' })
     expect(tool.presentResult!({ path: '/a' }, { content: [{ type: 'text', text: 'x' }], isError: false }))
-      .toEqual({ title: 'Opened /a', content: [{ type: 'text', text: 'x' }] })
+      .toEqual({ card: 'generic', title: 'Opened /a', content: [{ type: 'text', text: 'x' }] })
   })
 
   it('a tool without presentCall/presentResult leaves them undefined (UI falls back generically)', () => {
@@ -934,8 +966,8 @@ describe('defineTool presentation (presentCall / presentResult)', () => {
       description: 'demo',
       parameters: { path: { type: 'string', required: true } },
       async execute() { return [] },
-      presentCall: args => ({ title: args.path }),
-      presentResult: (args, result) => ({ title: args.path, content: result.content }),
+      presentCall: args => ({ card: 'generic', title: args.path }),
+      presentResult: (args, result) => ({ card: 'generic', title: args.path, content: result.content }),
     })
     // Unlike execute (which throws ToolArgsError on a mismatch), the display
     // methods soft-validate and fall back to undefined so a UI never crashes

packages/fs/fs-local/src/fsio.ts

@@ -457,6 +457,26 @@ export async function readForEdit(
   return { content: normalizeLineEndings(raw), lineEndings: detectLineEndings(raw) }
 }
 
+/**
+ * Best-effort read of a file's current text for a before/after diff basis, used
+ * by an overwrite. Returns the LF-normalized decoded content, or `null` when the
+ * file is binary or not valid UTF-8 — a write must succeed regardless of the
+ * prior bytes, so an undiffable prior file simply yields no contextual-hunk basis
+ * (the caller treats `null` the same as an absent file: the result renders a
+ * whole-file diff rather than an applied hunk).
+ */
+export async function readTextForDiff(absolutePath: string, signal?: AbortSignal): Promise<string | null> {
+  const buffer = await readFileAbortable(absolutePath, 'read', signal)
+  if (buffer.includes(0)) return null
+  try {
+    return normalizeLineEndings(new TextDecoder('utf-8', { fatal: true }).decode(buffer))
+  } catch (error: unknown) {
+    /* v8 ignore next 2 -- TextDecoder({fatal}) only throws TypeError on invalid bytes; any other throw is an unreachable runtime fault. */
+    if (!(error instanceof TypeError)) throw error
+    return null
+  }
+}
+
 /**
  * Apply a literal replacement to LF-normalized content. Throws
  * `FS_EDIT_NOT_FOUND` on empty `oldString` or zero matches and
@@ -485,4 +505,4 @@ export function applyLiteralEdit(
   return { content: content.split(oldNorm).join(newNorm), replacements }
 }
 
-export { restoreLineEndings }
+export { normalizeLineEndings, restoreLineEndings }

packages/fs/fs-local/src/index.ts

@@ -28,8 +28,10 @@ import type {
 import {
   applyLiteralEdit,
   listDirectory,
+  normalizeLineEndings,
   probe,
   readForEdit,
+  readTextForDiff,
   readWholeText,
   resolveLocalTarget,
   restoreLineEndings,
@@ -44,6 +46,7 @@ export {
   listDirectory,
   probe,
   readForEdit,
+  readTextForDiff,
   readWholeText,
   resolveLocalTarget,
   restoreLineEndings,
@@ -157,11 +160,25 @@ export class LocalFileSystem extends FileSystem {
       // provider) — no version guard, no read-first requirement. Still atomic
       // (the per-target lock is unconditional), so the write is never torn.
 
+      // Capture the prior text (the before/after diff basis) BEFORE the write.
+      // `null` for a create (no existing file) OR an existing-but-undiffable
+      // file (binary/invalid-UTF-8) — a null `before` gives no contextual-hunk
+      // basis, so a consumer falls back to a whole-file diff (the tool still
+      // renders a result-time diff card, not the raw result text).
+      // TODO(overwrite-diff-bound): this reads the whole prior file into memory
+      // for a UI-only diff; bound the pre-read and fall back to no contextual
+      // basis above a size threshold (see the applied-hunk-diffs RFC non-goals).
+      const before = existing ? await readTextForDiff(target.targetKey, signal) : null
       await writeFileAtomic(target.targetKey, content, existing?.mode, signal, this.internals)
       const after = await probe(target.targetKey)
       return {
         operation: existing ? 'update' : 'create',
         version: this.versionAfterWrite(after, target),
+        before,
+        // LF-normalized to share the diff basis with `before` (also LF): a CRLF
+        // overwrite must not read as every line changed. Line-ending restoration
+        // is a storage detail the applied-hunk diff ignores.
+        after: normalizeLineEndings(content),
       }
     })
   }
@@ -197,6 +214,10 @@ export class LocalFileSystem extends FileSystem {
         replacements: edited.replacements,
         replaceAll: edit.replaceAll,
         version: this.versionAfterWrite(after, target),
+        // The LF-normalized before/after text (the applied-hunk diff basis);
+        // line-ending restoration is a storage detail the diff ignores.
+        before: original.content,
+        after: edited.content,
       }
     })
   }

packages/fs/fs-local/tests/filesystem.spec.ts

@@ -238,6 +238,53 @@ describe('writeText', () => {
     await expect(fs.writeText(target, 'x')).rejects.toMatchObject({ code: 'FS_NOT_REGULAR_FILE' })
   })
 
+  it('a create reports before:null and after = the written content (no prior file)', async () => {
+    const target = await fs.resolve('new.txt')
+    const outcome = await fs.writeText(target, 'fresh')
+    expect(outcome.before).toBeNull()
+    expect(outcome.after).toBe('fresh')
+  })
+
+  it('an overwrite reports before = the OLD content and after = the new content', async () => {
+    await writeFile(join(dir, 'a.txt'), 'old body')
+    const target = await fs.resolve('a.txt')
+    const outcome = await fs.writeText(target, 'new body')
+    expect(outcome.before).toBe('old body')
+    expect(outcome.after).toBe('new body')
+  })
+
+  it('an overwrite returns LF-normalized before AND after (a CRLF rewrite is not every-line-changed)', async () => {
+    // The applied-hunk diff bases on `before`/`after`; if `after` kept CRLF while
+    // `before` is LF-normalized, a CRLF rewrite would read as every line changed.
+    // Both sides are LF so only the genuinely-changed line diffs.
+    await writeFile(join(dir, 'a.txt'), 'a\r\nb\r\nc\r\n')
+    const target = await fs.resolve('a.txt')
+    const outcome = await fs.writeText(target, 'a\r\nB\r\nc\r\n')
+    expect(outcome.before).toBe('a\nb\nc\n')
+    expect(outcome.after).toBe('a\nB\nc\n')
+  })
+
+  it('an overwrite of a BINARY prior file reports before:null (undiffable), still succeeds', async () => {
+    await writeFile(join(dir, 'a.bin'), Buffer.from([0x00, 0x01, 0x02]))
+    const target = await fs.resolve('a.bin')
+    const outcome = await fs.writeText(target, 'now text')
+    expect(outcome.operation).toBe('update')
+    expect(outcome.before).toBeNull()
+    expect(outcome.after).toBe('now text')
+  })
+
+  it('an overwrite of an INVALID-UTF-8 (non-NUL) prior file reports before:null, still succeeds', async () => {
+    // 0xff is never valid UTF-8 but is not a NUL, so it exercises the decoder's
+    // fatal-throw path (not the NUL-scan short-circuit): an undiffable prior file
+    // still yields a successful write with no before-content basis.
+    await writeFile(join(dir, 'a.bin'), Buffer.from([0x68, 0xff, 0x69]))
+    const target = await fs.resolve('a.bin')
+    const outcome = await fs.writeText(target, 'now valid')
+    expect(outcome.operation).toBe('update')
+    expect(outcome.before).toBeNull()
+    expect(outcome.after).toBe('now valid')
+  })
+
   it('releases per-target mutation locks after success and failure', async () => {
     const target = await fs.resolve('a.txt')
     await fs.writeText(target, 'created', { kind: 'createIfAbsent' })
@@ -292,6 +339,17 @@ describe('editText', () => {
     expect(await readFile(join(dir, 'a.txt'), 'utf8')).toBe('hello there')
   })
 
+  it('reports before/after content (the applied-hunk basis), LF-normalized', async () => {
+    await writeFile(join(dir, 'a.txt'), 'a\r\nOLD\r\nb\r\n')
+    const target = await fs.resolve('a.txt')
+    const outcome = await fs.editText(target, { oldString: 'OLD', newString: 'NEW', replaceAll: false })
+    expect(outcome.before).toBe('a\nOLD\nb\n')
+    expect(outcome.after).toBe('a\nNEW\nb\n')
+    // The written file keeps the original CRLF endings (before/after are the
+    // LF-normalized diff basis, not the on-disk bytes).
+    expect(await readFile(join(dir, 'a.txt'), 'utf8')).toBe('a\r\nNEW\r\nb\r\n')
+  })
+
   it('checks the stale version BEFORE literal matching', async () => {
     await writeFile(join(dir, 'a.txt'), 'hello world')
     const target = await fs.resolve('a.txt')

packages/fs/fs/src/types.ts

@@ -118,6 +118,16 @@ export interface FsWriteOutcome {
   operation: 'create' | 'update'
   /** Opaque version of the file after the write. */
   version: FsVersion
+  /**
+   * The file's content BEFORE the write, or `null` when the file did not exist
+   * (a create) or was undiffable (binary/non-UTF-8). LF-normalized storage text
+   * (the diff basis), never a diff — a consumer computes the result-time
+   * contextual diff from `before`/`after` when `before` is present, else falls
+   * back to a whole-file diff.
+   */
+  before: string | null
+  /** The file's content AFTER the write, LF-normalized to share `before`'s diff basis. */
+  after: string
 }
 
 /** A literal-replacement edit request. */
@@ -138,6 +148,14 @@ export interface FsEditOutcome {
   replaceAll: boolean
   /** Opaque version of the file after the edit. */
   version: FsVersion
+  /**
+   * The file's content BEFORE the edit. Raw storage text (LF-normalized by the
+   * backend), never a diff — a consumer computes the result-time contextual diff
+   * (the applied hunk with context) from `before`/`after`.
+   */
+  before: string
+  /** The file's content AFTER the edit. */
+  after: string
 }
 
 /**

packages/fs/fs/tests/service.spec.ts

@@ -52,14 +52,15 @@ class FakeFileSystem extends FileSystem {
     ]
   }
   override async writeText(target: FsTarget, content: string, _expected?: FsWriteIntent): Promise<FsWriteOutcome> {
-    const existed = this.files.has(target.targetKey)
+    const before = this.files.get(target.targetKey) ?? null
     this.files.set(target.targetKey, content)
-    return { operation: existed ? 'update' : 'create', version: FsVersion('v2') }
+    return { operation: before !== null ? 'update' : 'create', version: FsVersion('v2'), before, after: content }
   }
   override async editText(target: FsTarget, edit: FsEditRequest): Promise<FsEditOutcome> {
     const content = this.files.get(target.targetKey) ?? ''
-    this.files.set(target.targetKey, content.split(edit.oldString).join(edit.newString))
-    return { replacements: 1, replaceAll: edit.replaceAll, version: FsVersion('v3') }
+    const after = content.split(edit.oldString).join(edit.newString)
+    this.files.set(target.targetKey, after)
+    return { replacements: 1, replaceAll: edit.replaceAll, version: FsVersion('v3'), before: content, after }
   }
 }
 

packages/fs/tool-fs/package.json

@@ -21,9 +21,13 @@
     "src"
   ],
   "license": "BSD-3-Clause",
+  "dependencies": {
+    "diff": "^9.0.0"
+  },
   "peerDependencies": {
     "@deepseek-ai/dsh-fs": "^0.0.1",
     "@deepseek-ai/dsh-llm": "^0.0.1",
+    "@deepseek-ai/dsh-session": "^0.0.1",
     "@deepseek-ai/dsh-system-prompt": "^0.0.1",
     "@deepseek-ai/dsh-tools": "^0.0.1",
     "cordis": "^4.0.0-rc.6"

packages/fs/tool-fs/src/diff.ts

@@ -0,0 +1,92 @@
+/**
+ * Result-time contextual-diff computation for the `write`/`edit` tools. Turns a
+ * before/after pair of file texts into one {@link FileDiff} per applied hunk —
+ * each hunk's `oldText`/`newText` reconstructed from the unified-diff lines with
+ * ±{@link DIFF_CONTEXT} surrounding context lines, matching how claude-agent-acp
+ * renders an editor inline diff.
+ *
+ * This is display-only presentation vocabulary (a UI concern), so it lives in
+ * the model-facing tool, NOT the `dsh-fs` storage seam — the backend returns
+ * only the raw before/after text (storage facts) and the tool computes the diff.
+ *
+ * @module @deepseek-ai/dsh-tool-fs/src/diff
+ */
+
+import { structuredPatch } from 'diff'
+import type { FileDiff } from '@deepseek-ai/dsh-tools'
+
+/** Context lines shown on each side of an applied hunk (matches claude-agent-acp). */
+export const DIFF_CONTEXT = 3
+
+/**
+ * The `write`/`edit` tools' private `tool/result` `meta` payload: the applied
+ * contextual-diff hunks. Attached opaquely (as `unknown`) on the tool result and
+ * persisted with the session log — it must be JSON-serializable (the session
+ * validates this at `append`), so `presentResult` reproduces the diff card on
+ * replay. The producing tool owns this shape; the bridge only sees the opaque
+ * `meta` and the tool narrows it back via {@link diffsFromMeta}.
+ */
+export type FsDiffMeta = { diffs: FileDiff[] }
+
+/**
+ * Compute one {@link FileDiff} per hunk between `before` and `after`, each
+ * carrying the applied change plus {@link DIFF_CONTEXT} context lines. Returns an
+ * empty array when the texts are identical (no hunks). For a scattered
+ * `replace_all` edit the patch yields multiple hunks, so multiple `FileDiff`s
+ * come back — matching the editor rendering one diff block per site.
+ *
+ * Each hunk's `oldText` is its `-` (removed) and context lines joined by `\n`;
+ * `newText` is its `+` (added) and context lines. A hunk with no old lines
+ * (a pure insertion) reports `oldText: null` (nothing to diff against), mirroring
+ * the call-time card's new-file convention. The unified-diff "\ No newline at end
+ * of file" markers are dropped — they annotate the patch, not file content.
+ */
+export function computeHunkDiffs(path: string, before: string, after: string): FileDiff[] {
+  const patch = structuredPatch('', '', before, after, undefined, undefined, { context: DIFF_CONTEXT })
+  const diffs: FileDiff[] = []
+  for (const hunk of patch.hunks) {
+    const oldLines: string[] = []
+    const newLines: string[] = []
+    for (const line of hunk.lines) {
+      // The unified-diff marker for a missing trailing newline annotates the
+      // patch, not the content — skip it so it never leaks into a diff block.
+      if (line.startsWith('\\')) continue
+      const text = line.slice(1)
+      if (line.startsWith('-')) {
+        oldLines.push(text)
+      } else if (line.startsWith('+')) {
+        newLines.push(text)
+      } else {
+        // A context (unchanged) line appears on both sides.
+        oldLines.push(text)
+        newLines.push(text)
+      }
+    }
+    diffs.push({ path, oldText: oldLines.length > 0 ? oldLines.join('\n') : null, newText: newLines.join('\n') })
+  }
+  return diffs
+}
+
+/** Whether `value` is a valid {@link FileDiff} (defensive narrowing from opaque `meta`). */
+function isFileDiff(value: unknown): value is FileDiff {
+  if (typeof value !== 'object' || value === null || Array.isArray(value)) return false
+  const { path, oldText, newText } = value as Record<string, unknown>
+  return typeof path === 'string'
+    && (oldText === null || typeof oldText === 'string')
+    && typeof newText === 'string'
+}
+
+/**
+ * Narrow an opaque `tool/result` `meta` back to this tool's {@link FileDiff}
+ * hunks, or `undefined` when it is absent/malformed. `presentResult` runs on
+ * arbitrary logged `meta` (possibly from an older shape or a hand-edited log), so
+ * it validates defensively rather than trusting the payload — a bad `meta` yields
+ * `undefined`, and the caller decides the fallback (edit → the generic result
+ * rendering; write → an args-derived whole-file diff), never a thrown presenter.
+ */
+export function diffsFromMeta(meta: unknown): FileDiff[] | undefined {
+  if (typeof meta !== 'object' || meta === null || Array.isArray(meta)) return undefined
+  const diffs = (meta as Record<string, unknown>).diffs
+  if (!Array.isArray(diffs) || diffs.length === 0 || !diffs.every(isFileDiff)) return undefined
+  return diffs
+}

packages/fs/tool-fs/src/edit.ts

@@ -14,10 +14,12 @@
 
 import type { Context } from 'cordis'
 import { defineTool } from '@deepseek-ai/dsh-tools'
+import type { DiffCallView, DiffResultView, ToolResult } from '@deepseek-ai/dsh-tools'
 import type { ContentBlock } from '@deepseek-ai/dsh-llm'
 import type { FsEditOutcome } from '@deepseek-ai/dsh-fs'
 import type {} from '@deepseek-ai/dsh-fs'
 import type {} from '@deepseek-ai/dsh-system-prompt'
+import { computeHunkDiffs, diffsFromMeta, type FsDiffMeta } from './diff.ts'
 import { sessionCwd } from './session-cwd.ts'
 
 /** Validated `edit` arguments after defaulting. */
@@ -65,7 +67,7 @@ export function applyEditTool(ctx: Context): void {
       new_string: { type: 'string', required: true, description: 'Literal replacement text. Use an empty string to delete the match.' },
       replace_all: { type: 'boolean', description: 'Replace all matches. Defaults to false; when false, old_string must appear exactly once.' },
     },
-    async execute(args, exec): Promise<ContentBlock[]> {
+    async execute(args, exec): Promise<{ content: ContentBlock[]; meta?: FsDiffMeta }> {
       const input = parseEditArgs(args)
       const cwd = sessionCwd(exec)
       const target = await ctx.fs.resolve(input.filePath, cwd !== undefined ? { cwd } : undefined)
@@ -81,20 +83,39 @@ export function applyEditTool(ctx: Context): void {
       )
       // Record the observed version (a no-op when no policy plugin listens).
       ctx.emit('fs/observed', target, outcome.version, exec)
-      return [{ type: 'text', text: formatEditOutput(target.displayPath, outcome) }]
-    },
-    // Pure display: `edit` kind, a location for editor follow-along, and a short
-    // old→new summary as rawInput (truncated so a large replacement stays a
-    // readable card). The replacement COUNT is not available here — presentResult
-    // only sees `{ content, isError }`, not the outcome — so the title is static.
-    presentCall(args) {
-      const clip = (s: string): string => (s.length > 40 ? `${s.slice(0, 40)}…` : s)
+      // The result-time applied-hunk diff (before→after with context lines). An
+      // edit always changes content (parseEditArgs requires old_string to differ
+      // and editText matches at least once), so there is always at least one hunk.
+      // The bridge renders these as an inline diff that supersedes the call-time
+      // snippet; the display path is the model-facing `file_path` (the bridge
+      // relativizes it).
+      const diffs = computeHunkDiffs(input.filePath, outcome.before, outcome.after)
       return {
+        content: [{ type: 'text', text: formatEditOutput(target.displayPath, outcome) }],
+        meta: { diffs },
+      }
+    },
+    // Pure display: a diff card of the literal replacement (old_string →
+    // new_string), derived from the call args. `oldText: old_string || null`
+    // matches claude-agent-acp's Edit arm; new_string is a required arg here, so
+    // it maps straight to newText. A follow-along location points at the file.
+    presentCall(args): DiffCallView {
+      return {
+        card: 'diff',
         title: `Edit ${args.file_path}`,
-        kind: 'edit',
-        rawInput: `${JSON.stringify(clip(args.old_string))} → ${JSON.stringify(clip(args.new_string))}`,
+        diffs: [{ path: args.file_path, oldText: args.old_string || null, newText: args.new_string }],
         locations: [{ path: args.file_path }],
       }
     },
+    // Result-time display: the applied contextual-diff hunks carried on `meta`.
+    // On success with diffs, a `diff` result card supersedes the call-time
+    // snippet; on error (nothing applied) or malformed meta, fall through to the
+    // generic "updated successfully" rendering.
+    presentResult(args, result: ToolResult): DiffResultView | undefined {
+      if (result.isError) return undefined
+      const diffs = diffsFromMeta(result.meta)
+      if (diffs === undefined) return undefined
+      return { card: 'diff', title: `Edit ${args.file_path}`, diffs }
+    },
   }))
 }

packages/fs/tool-fs/src/index.ts

@@ -32,6 +32,8 @@ export { applyWriteTool, formatWriteOutput, parseWriteArgs } from './write.ts'
 export { applyEditTool, formatEditOutput, parseEditArgs } from './edit.ts'
 export { READ_MAX_BYTES, READ_MAX_LINE_LENGTH, buildWindow, formatReadOutput } from './read-render.ts'
 export type { FileReadOutcome, FileTextLine, ReadWindow, WindowResult } from './read-render.ts'
+export { DIFF_CONTEXT, computeHunkDiffs, diffsFromMeta } from './diff.ts'
+export type { FsDiffMeta } from './diff.ts'
 
 /** Cordis plugin name used by loader diagnostics. */
 export const name = 'tool-fs'

packages/fs/tool-fs/src/read.ts

@@ -14,6 +14,7 @@
 
 import type { Context } from 'cordis'
 import { defineTool } from '@deepseek-ai/dsh-tools'
+import type { GenericCallView } from '@deepseek-ai/dsh-tools'
 import type { ContentBlock } from '@deepseek-ai/dsh-llm'
 import { FsError } from '@deepseek-ai/dsh-fs'
 import type {} from '@deepseek-ai/dsh-fs'
@@ -101,19 +102,21 @@ export function applyReadTool(ctx: Context): void {
       ctx.emit('fs/observed', target, info.version, exec)
       return [{ type: 'text', text: formatReadOutput(target.displayPath, outcome) }]
     },
-    // Pure display: a UI card titled by the file, `read` kind (icon), and a
-    // location so an editor can follow along to the file (and the read's offset
-    // line). `rawInput` surfaces offset/limit when the model narrowed the read.
-    presentCall(args) {
-      const detail = [
-        ...args.offset !== undefined ? [`offset ${args.offset}`] : [],
-        ...args.limit !== undefined ? [`limit ${args.limit}`] : [],
-      ].join(', ')
+    // Pure display: a generic card titled by the file with the read window
+    // appended (`Read foo.txt (5 - 8)`), `read` kind (icon), and a follow-along
+    // location whose line is the read's offset (defaulting to 1). The window is
+    // derived from the RAW args (offset/limit as the model passed them), NOT the
+    // tool's defaulted 1/READ_LIMIT, so an unbounded read shows a bare title.
+    presentCall(args): GenericCallView {
+      const { offset, limit } = args
+      const window = limit !== undefined && limit > 0
+        ? ` (${offset ?? 1} - ${(offset ?? 1) + limit - 1})`
+        : offset !== undefined ? ` (from line ${offset})` : ''
       return {
-        title: `Read ${args.file_path}`,
+        card: 'generic',
+        title: `Read ${args.file_path}${window}`,
         kind: 'read',
-        locations: [{ path: args.file_path, ...args.offset !== undefined ? { line: args.offset } : {} }],
-        ...detail.length > 0 ? { rawInput: detail } : {},
+        locations: [{ path: args.file_path, line: offset ?? 1 }],
       }
     },
   }))

packages/fs/tool-fs/src/write.ts

@@ -13,10 +13,12 @@
 
 import type { Context } from 'cordis'
 import { defineTool } from '@deepseek-ai/dsh-tools'
+import type { DiffCallView, DiffResultView, ToolResult } from '@deepseek-ai/dsh-tools'
 import type { ContentBlock } from '@deepseek-ai/dsh-llm'
 import type { FsWriteOutcome } from '@deepseek-ai/dsh-fs'
 import type {} from '@deepseek-ai/dsh-fs'
 import type {} from '@deepseek-ai/dsh-system-prompt'
+import { computeHunkDiffs, diffsFromMeta, type FsDiffMeta } from './diff.ts'
 import { sessionCwd } from './session-cwd.ts'
 
 /** Validate value constraints the schema DSL can't express. */
@@ -50,7 +52,7 @@ export function applyWriteTool(ctx: Context): void {
       file_path: { type: 'string', required: true, description: 'Path to write, resolved by the filesystem backend.' },
       content: { type: 'string', required: true, description: 'Full UTF-8 text content to write.' },
     },
-    async execute(args, exec): Promise<ContentBlock[]> {
+    async execute(args, exec): Promise<{ content: ContentBlock[]; meta?: FsDiffMeta }> {
       const input = parseWriteArgs(args)
       const cwd = sessionCwd(exec)
       const target = await ctx.fs.resolve(input.filePath, cwd !== undefined ? { cwd } : undefined)
@@ -60,14 +62,41 @@ export function applyWriteTool(ctx: Context): void {
       const outcome = await ctx.fs.writeText(target, input.content, intent, exec.signal)
       // Record the observed version (a no-op when no policy plugin listens).
       ctx.emit('fs/observed', target, outcome.version, exec)
-      return [{ type: 'text', text: formatWriteOutput(target.displayPath, outcome) }]
+      // Attach a contextual hunk as `meta` ONLY for an overwrite (a before-version
+      // exists). A create has no "before" — `outcome.before` is null — so it
+      // carries no `meta`; `presentResult` then renders a whole-file diff from the
+      // args, so the completed card is still a diff (never the result text).
+      const diffs = outcome.before !== null ? computeHunkDiffs(input.filePath, outcome.before, outcome.after) : []
+      return {
+        content: [{ type: 'text', text: formatWriteOutput(target.displayPath, outcome) }],
+        ...diffs.length > 0 ? { meta: { diffs } } : {},
+      }
     },
-    // Pure display: `edit` kind (an editor treats create/replace as an edit) and
-    // a location so the UI can follow along to the written file. The create-vs-
-    // overwrite fact lives in the model-facing result text; `presentResult` only
-    // sees `{ content, isError }` (not the outcome), so the title stays static.
-    presentCall(args) {
-      return { title: `Write ${args.file_path}`, kind: 'edit', locations: [{ path: args.file_path }] }
+    // Pure display: a diff card (an editor renders write as a new-file / full-
+    // replace diff). `oldText: null` — a call-time presenter has no access to the
+    // file's prior content, so even an overwrite renders new-file style, matching
+    // claude-agent-acp. A follow-along location points at the written file.
+    presentCall(args): DiffCallView {
+      return {
+        card: 'diff',
+        title: `Write ${args.file_path}`,
+        diffs: [{ path: args.file_path, oldText: null, newText: args.content }],
+        locations: [{ path: args.file_path }],
+      }
+    },
+    // Result-time display: a `diff` card so the completed `tool_call_update`
+    // re-installs the diff rather than the model-facing result text (an ACP
+    // `tool_call_update.content` REPLACES the call's content, so a text result
+    // would clobber the pending diff card). An OVERWRITE uses the applied
+    // contextual hunks on `meta`; a CREATE has no `meta` (no prior content), so
+    // its whole-file new-file diff is derived from `args.content` (replay-safe,
+    // matching the call-time card). An error falls through to generic rendering
+    // so its message shows.
+    presentResult(args, result: ToolResult): DiffResultView | undefined {
+      if (result.isError) return undefined
+      const diffs = diffsFromMeta(result.meta)
+        ?? [{ path: args.file_path, oldText: null, newText: args.content }]
+      return { card: 'diff', title: `Write ${args.file_path}`, diffs }
     },
   }))
 }

packages/fs/tool-fs/tests/diff.spec.ts

@@ -0,0 +1,113 @@
+/**
+ * Unit tests for the result-time contextual-diff computation (`src/diff.ts`):
+ * the pure before/after → {@link FileDiff}[] hunk builder and the defensive
+ * `meta` narrowing. These pin the exact hunk reconstruction (context lines,
+ * multi-hunk replaceAll, pure insertion/deletion, no-op) the ACP bridge renders.
+ */
+
+import { describe, expect, it } from 'vitest'
+import { computeHunkDiffs, diffsFromMeta, DIFF_CONTEXT } from '@deepseek-ai/dsh-tool-fs'
+import type { JsonValue } from '@deepseek-ai/dsh-session'
+
+const lines = (n: number): string => Array.from({ length: n }, (_, i) => `line${i + 1}`).join('\n') + '\n'
+
+describe('computeHunkDiffs', () => {
+  it('a single-line change yields one hunk with ±context lines on both sides', () => {
+    const before = lines(8)
+    const after = before.replace('line4', 'CHANGED')
+    const diffs = computeHunkDiffs('f.txt', before, after)
+    expect(diffs).toEqual([{
+      path: 'f.txt',
+      oldText: 'line1\nline2\nline3\nline4\nline5\nline6\nline7',
+      newText: 'line1\nline2\nline3\nCHANGED\nline5\nline6\nline7',
+    }])
+  })
+
+  it('a scattered replace_all yields one FileDiff PER hunk (matching per-site editor blocks)', () => {
+    const before = lines(20)
+    const after = before.replace('line3', 'A').replace('line16', 'B')
+    const diffs = computeHunkDiffs('f.txt', before, after)
+    expect(diffs).toHaveLength(2)
+    expect(diffs[0]?.path).toBe('f.txt')
+    expect(diffs[0]?.oldText).toContain('line3')
+    expect(diffs[0]?.newText).toContain('A')
+    expect(diffs[1]?.oldText).toContain('line16')
+    expect(diffs[1]?.newText).toContain('B')
+    // The two hunks are distinct sites, not one merged block.
+    expect(diffs[0]?.newText).not.toContain('B')
+    expect(diffs[1]?.newText).not.toContain('A')
+  })
+
+  it('identical before/after (a no-op) yields no hunks', () => {
+    expect(computeHunkDiffs('f.txt', 'same\n', 'same\n')).toEqual([])
+  })
+
+  it('a pure insertion into empty content reports oldText null (nothing to diff against)', () => {
+    const diffs = computeHunkDiffs('f.txt', '', 'brand new\n')
+    expect(diffs).toEqual([{ path: 'f.txt', oldText: null, newText: 'brand new' }])
+  })
+
+  it('a pure deletion of the whole file reports newText empty', () => {
+    const diffs = computeHunkDiffs('f.txt', 'gone\n', '')
+    expect(diffs).toEqual([{ path: 'f.txt', oldText: 'gone', newText: '' }])
+  })
+
+  it('drops the "\\ No newline at end of file" marker from a no-trailing-newline change', () => {
+    const diffs = computeHunkDiffs('f.txt', 'x', 'y')
+    // The marker line (starting with "\\") must never leak into a diff block.
+    expect(diffs).toEqual([{ path: 'f.txt', oldText: 'x', newText: 'y' }])
+    expect(diffs[0]?.oldText).not.toContain('\\')
+    expect(diffs[0]?.newText).not.toContain('\\')
+  })
+
+  it('uses DIFF_CONTEXT (3) surrounding lines', () => {
+    expect(DIFF_CONTEXT).toBe(3)
+    const before = lines(20)
+    const after = before.replace('line10', 'CHANGED')
+    const [diff] = computeHunkDiffs('f.txt', before, after)
+    // 3 context above (7,8,9) + the change + 3 below (11,12,13) = 7 lines a side.
+    expect(diff?.oldText?.split('\n')).toHaveLength(7)
+    expect(diff?.newText.split('\n')).toHaveLength(7)
+    expect(diff?.oldText?.split('\n')[0]).toBe('line7')
+  })
+})
+
+describe('diffsFromMeta (defensive narrowing)', () => {
+  // The narrowing accepts an opaque JsonValue; a malformed payload is not a
+  // statically-valid JsonValue, so route every case through one cast helper that
+  // mirrors how a hand-edited/older session log delivers arbitrary shapes.
+  const m = (value: unknown): JsonValue | undefined => value as JsonValue | undefined
+  const good = { diffs: [{ path: 'f.txt', oldText: 'a', newText: 'b' }] }
+
+  it('narrows a well-formed { diffs } payload', () => {
+    expect(diffsFromMeta(m(good))).toEqual(good.diffs)
+  })
+
+  it('accepts a diff whose oldText is null (a create-style hunk)', () => {
+    const meta = { diffs: [{ path: 'f.txt', oldText: null, newText: 'x' }] }
+    expect(diffsFromMeta(m(meta))).toEqual(meta.diffs)
+  })
+
+  it('rejects undefined / non-object / array meta', () => {
+    expect(diffsFromMeta(undefined)).toBeUndefined()
+    expect(diffsFromMeta(null)).toBeUndefined()
+    expect(diffsFromMeta(m('nope'))).toBeUndefined()
+    expect(diffsFromMeta(m([]))).toBeUndefined()
+  })
+
+  it('rejects a missing / empty / non-array diffs field', () => {
+    expect(diffsFromMeta(m({}))).toBeUndefined()
+    expect(diffsFromMeta(m({ diffs: [] }))).toBeUndefined()
+    expect(diffsFromMeta(m({ diffs: 'x' }))).toBeUndefined()
+  })
+
+  it('rejects a diffs array containing a malformed entry', () => {
+    expect(diffsFromMeta(m({ diffs: [{ path: 'f.txt', oldText: 'a' }] }))).toBeUndefined()
+    expect(diffsFromMeta(m({ diffs: [{ path: 1, oldText: 'a', newText: 'b' }] }))).toBeUndefined()
+    expect(diffsFromMeta(m({ diffs: [{ path: 'f', oldText: 5, newText: 'b' }] }))).toBeUndefined()
+    expect(diffsFromMeta(m({ diffs: [{ path: 'f', oldText: 'a', newText: 7 }] }))).toBeUndefined()
+    expect(diffsFromMeta(m({ diffs: [null] }))).toBeUndefined()
+    expect(diffsFromMeta(m({ diffs: ['x'] }))).toBeUndefined()
+    expect(diffsFromMeta(m({ diffs: [[]] }))).toBeUndefined()
+  })
+})

packages/fs/tool-fs/tests/tools.spec.ts

@@ -61,16 +61,17 @@ class FakeFs extends FileSystem {
   override async writeText(target: FsTarget, content: string, expected?: FsWriteIntent): Promise<FsWriteOutcome> {
     this.throwIfArmed()
     this.writeIntents.push(expected)
-    const existed = this.files.has(target.targetKey)
+    const before = this.files.get(target.targetKey) ?? null
     this.files.set(target.targetKey, content)
-    return { operation: existed ? 'update' : 'create', version: FsVersion('v2') }
+    return { operation: before !== null ? 'update' : 'create', version: FsVersion('v2'), before, after: content }
   }
   override async editText(target: FsTarget, edit: FsEditRequest, expected?: { version: FsVersion }): Promise<FsEditOutcome> {
     this.throwIfArmed()
     this.editIntents.push(expected)
     const content = this.files.get(target.targetKey) ?? ''
-    this.files.set(target.targetKey, content.split(edit.oldString).join(edit.newString))
-    return { replacements: 1, replaceAll: edit.replaceAll, version: FsVersion('v3') }
+    const after = content.split(edit.oldString).join(edit.newString)
+    this.files.set(target.targetKey, after)
+    return { replacements: 1, replaceAll: edit.replaceAll, version: FsVersion('v3'), before: content, after }
   }
 }
 
@@ -356,34 +357,141 @@ describe('tool-owned presentation (pure presentCall)', () => {
     return ctx.tools.get(name)?.presentCall?.(args)
   }
 
-  it('read: titles by file, read kind, location with the offset line', async () => {
+  it('read: generic card titled by file with the read window, read kind, location with the offset line', async () => {
     expect(await presentCall('read', { file_path: 'src/a.ts', offset: 12, limit: 40 })).toEqual({
-      title: 'Read src/a.ts', kind: 'read', rawInput: 'offset 12, limit 40',
+      card: 'generic', title: 'Read src/a.ts (12 - 51)', kind: 'read',
       locations: [{ path: 'src/a.ts', line: 12 }],
     })
   })
 
-  it('read: omits rawInput and the location line when offset/limit are unset', async () => {
+  it('read: bare title and line-1 location when offset/limit are unset', async () => {
     expect(await presentCall('read', { file_path: 'a.txt' })).toEqual({
-      title: 'Read a.txt', kind: 'read', locations: [{ path: 'a.txt' }],
+      card: 'generic', title: 'Read a.txt', kind: 'read', locations: [{ path: 'a.txt', line: 1 }],
     })
   })
 
-  it('write: titles by file, edit kind, location', async () => {
-    expect(await presentCall('write', { file_path: 'out.txt', content: 'x' })).toEqual({
-      title: 'Write out.txt', kind: 'edit', locations: [{ path: 'out.txt' }],
+  it('read: "from line N" window when only offset is set', async () => {
+    expect(await presentCall('read', { file_path: 'a.txt', offset: 5 })).toEqual({
+      card: 'generic', title: 'Read a.txt (from line 5)', kind: 'read', locations: [{ path: 'a.txt', line: 5 }],
     })
   })
 
-  it('edit: titles by file, edit kind, an old→new rawInput summary, location', async () => {
-    expect(await presentCall('edit', { file_path: 'a.txt', old_string: 'foo', new_string: 'bar' })).toEqual({
-      title: 'Edit a.txt', kind: 'edit', rawInput: '"foo" → "bar"', locations: [{ path: 'a.txt' }],
+  it('write: diff card (new-file style, oldText null), location', async () => {
+    expect(await presentCall('write', { file_path: 'out.txt', content: 'hello' })).toEqual({
+      card: 'diff', title: 'Write out.txt',
+      diffs: [{ path: 'out.txt', oldText: null, newText: 'hello' }],
+      locations: [{ path: 'out.txt' }],
     })
   })
 
-  it('edit: clips a long old/new string in the rawInput summary', async () => {
-    const long = 'a'.repeat(60)
-    const p = await presentCall('edit', { file_path: 'a.txt', old_string: long, new_string: 'b' })
-    expect((p as { rawInput: string }).rawInput).toBe(`${JSON.stringify(`${'a'.repeat(40)}…`)} → ${JSON.stringify('b')}`)
+  it('read: a limit with no offset windows from line 1', async () => {
+    expect(await presentCall('read', { file_path: 'a.txt', limit: 10 })).toEqual({
+      card: 'generic', title: 'Read a.txt (1 - 10)', kind: 'read', locations: [{ path: 'a.txt', line: 1 }],
+    })
+  })
+
+  it('edit: an empty old_string maps to oldText null (a whole-file replace diff)', async () => {
+    // presentCall runs on replay of raw logged args, which parseEditArgs does not
+    // gate — an empty old_string must still produce a valid diff (oldText null).
+    expect(await presentCall('edit', { file_path: 'a.txt', old_string: '', new_string: 'seed' })).toEqual({
+      card: 'diff', title: 'Edit a.txt',
+      diffs: [{ path: 'a.txt', oldText: null, newText: 'seed' }],
+      locations: [{ path: 'a.txt' }],
+    })
+  })
+})
+
+describe('result-time contextual diff (meta + presentResult)', () => {
+  // An edit records the applied contextual hunk on `tool/result` meta, and the
+  // tool's presentResult narrows it back into a `diff` result card the bridge
+  // renders. Drive execute end-to-end so the meta is the REAL computed hunk.
+  const withContext = 'a\nb\nc\nOLD\nd\ne\nf\n'
+
+  it('edit: execute attaches the applied hunk as meta { diffs }', async () => {
+    const { ctx, fs } = await setup()
+    const session = { header: {} }
+    fs.files.set('key:a.txt', withContext)
+    await call(ctx, 'read', { file_path: 'a.txt' }, { session })
+    const result = await call(ctx, 'edit', { file_path: 'a.txt', old_string: 'OLD', new_string: 'NEW' }, { session })
+    expect(result.isError).toBe(false)
+    expect(result.meta).toEqual({
+      diffs: [{ path: 'a.txt', oldText: 'a\nb\nc\nOLD\nd\ne\nf', newText: 'a\nb\nc\nNEW\nd\ne\nf' }],
+    })
+  })
+
+  it('edit: presentResult turns the meta into a diff result card', async () => {
+    const { ctx, fs } = await setup()
+    const session = { header: {} }
+    fs.files.set('key:a.txt', withContext)
+    await call(ctx, 'read', { file_path: 'a.txt' }, { session })
+    const result = await call(ctx, 'edit', { file_path: 'a.txt', old_string: 'OLD', new_string: 'NEW' }, { session })
+    const view = ctx.tools.get('edit')?.presentResult?.({ file_path: 'a.txt', old_string: 'OLD', new_string: 'NEW' }, result)
+    expect(view).toEqual({
+      card: 'diff', title: 'Edit a.txt',
+      diffs: [{ path: 'a.txt', oldText: 'a\nb\nc\nOLD\nd\ne\nf', newText: 'a\nb\nc\nNEW\nd\ne\nf' }],
+    })
+  })
+
+  it('write OVERWRITE: execute attaches a contextual hunk; presentResult renders a diff card', async () => {
+    const { ctx, fs } = await setup()
+    const session = { header: {} }
+    fs.files.set('key:a.txt', withContext)
+    await call(ctx, 'read', { file_path: 'a.txt' }, { session })
+    const result = await call(ctx, 'write', { file_path: 'a.txt', content: 'a\nb\nc\nNEW\nd\ne\nf\n' }, { session })
+    expect(result.isError).toBe(false)
+    expect(result.meta).toEqual({ diffs: [{ path: 'a.txt', oldText: 'a\nb\nc\nOLD\nd\ne\nf', newText: 'a\nb\nc\nNEW\nd\ne\nf' }] })
+    const view = ctx.tools.get('write')?.presentResult?.({ file_path: 'a.txt', content: 'x' }, result)
+    expect(view).toEqual({ card: 'diff', title: 'Write a.txt', diffs: [{ path: 'a.txt', oldText: 'a\nb\nc\nOLD\nd\ne\nf', newText: 'a\nb\nc\nNEW\nd\ne\nf' }] })
+  })
+
+  it('write CREATE: no before-version → no meta, but presentResult still renders a whole-file diff card', async () => {
+    // A create has no prior content (no `meta`), yet the completed card must be a
+    // `diff` — an ACP tool_call_update.content REPLACES the call's content, so a
+    // non-diff result would clobber the pending new-file diff. The whole-file diff
+    // is derived from the args (oldText:null), replay-safe.
+    const { ctx } = await setup()
+    const session = { header: {} }
+    const result = await call(ctx, 'write', { file_path: 'new.txt', content: 'fresh\n' }, { session })
+    expect(result.isError).toBe(false)
+    expect(result.meta).toBeUndefined()
+    const view = ctx.tools.get('write')?.presentResult?.({ file_path: 'new.txt', content: 'fresh\n' }, result)
+    expect(view).toEqual({ card: 'diff', title: 'Write new.txt', diffs: [{ path: 'new.txt', oldText: null, newText: 'fresh\n' }] })
+  })
+
+  it('write OVERWRITE with identical content: a before exists but yields no hunk → no meta, presentResult falls back to a whole-file diff', async () => {
+    const { ctx, fs } = await setup()
+    const session = { header: {} }
+    fs.files.set('key:a.txt', 'same\n')
+    await call(ctx, 'read', { file_path: 'a.txt' }, { session })
+    const result = await call(ctx, 'write', { file_path: 'a.txt', content: 'same\n' }, { session })
+    expect(result.isError).toBe(false)
+    expect(result.meta).toBeUndefined()
+    const view = ctx.tools.get('write')?.presentResult?.({ file_path: 'a.txt', content: 'same\n' }, result)
+    expect(view).toEqual({ card: 'diff', title: 'Write a.txt', diffs: [{ path: 'a.txt', oldText: null, newText: 'same\n' }] })
+  })
+
+  it('presentResult returns undefined on an error result (nothing applied)', async () => {
+    const { ctx } = await setup()
+    const errorResult = { content: [{ type: 'text' as const, text: 'Error: boom' }], isError: true }
+    expect(ctx.tools.get('edit')?.presentResult?.({ file_path: 'a.txt', old_string: 'x', new_string: 'y' }, errorResult)).toBeUndefined()
+    expect(ctx.tools.get('write')?.presentResult?.({ file_path: 'a.txt', content: 'y' }, errorResult)).toBeUndefined()
+  })
+
+  it('edit presentResult returns undefined on malformed meta (defensive narrowing)', async () => {
+    // edit has no whole-file fallback (only a literal replacement), so a malformed
+    // meta yields the generic "updated successfully" rendering.
+    const { ctx } = await setup()
+    const badMeta = { content: [{ type: 'text' as const, text: 'ok' }], isError: false, meta: { diffs: 'nope' } }
+    expect(ctx.tools.get('edit')?.presentResult?.({ file_path: 'a.txt', old_string: 'x', new_string: 'y' }, badMeta)).toBeUndefined()
+  })
+
+  it('write presentResult falls back to a whole-file diff on malformed meta (never leaks the result text)', async () => {
+    // write always renders a diff card so the completed update can't clobber the
+    // pending diff with the model-facing text; a malformed meta falls back to the
+    // args-derived whole-file diff, same as a create.
+    const { ctx } = await setup()
+    const badMeta = { content: [{ type: 'text' as const, text: 'ok' }], isError: false, meta: { diffs: 'nope' } }
+    const view = ctx.tools.get('write')?.presentResult?.({ file_path: 'a.txt', content: 'y' }, badMeta)
+    expect(view).toEqual({ card: 'diff', title: 'Write a.txt', diffs: [{ path: 'a.txt', oldText: null, newText: 'y' }] })
   })
 })

packages/todo/tool-todo/src/index.ts

@@ -118,6 +118,6 @@ export function apply(ctx: Context): void {
         text: `Updated todo list: ${count('pending')} pending, ${count('in_progress')} in progress, ${count('completed')} completed.`,
       }])
     },
-    presentCall: args => ({ title: 'Update todo list', kind: 'other', rawInput: args.todos }),
+    presentCall: args => ({ card: 'generic', title: 'Update todo list', kind: 'other', rawInput: args.todos }),
   }))
 }

packages/todo/tool-todo/tests/tool-todo.spec.ts

@@ -135,7 +135,7 @@ describe('dsh-tool-todo', () => {
     const ctx = await setup()
     const def = ctx.tools.get('todo_write')!
     const todos = [{ content: 'a', status: 'pending' }]
-    expect(def.presentCall?.({ todos })).toEqual({ title: 'Update todo list', kind: 'other', rawInput: todos })
+    expect(def.presentCall?.({ todos })).toEqual({ card: 'generic', title: 'Update todo list', kind: 'other', rawInput: todos })
   })
 
   it('unregisters the tool when its contributing fiber is disposed (HMR-safety)', async () => {

packages/ui/acp/README.md

@@ -28,7 +28,7 @@ It is a **client-driver / UI plugin**, the structured analogue of the readline `
 | `session/load` | `ctx.agents.resume(...)` | replays the persisted event log to the client as `session/update` — the USER side (`user/message` → `user_message_chunk`), assistant text/reasoning (`assistant/chunk`), and tool calls/results (`tool/call` + `tool/result`). Re-loading an already-live id is rejected; the id's load slot is reserved (`loadingIds`) BEFORE the async resume so a pipelined load of the SAME id can't leak a second agent (distinct ids load concurrently). The resumed session keeps its PERSISTED header `cwd`, so its bash tools run in the original workspace; the requested `cwd` must be absolute and match the persisted `cwd`. After the async resume a `closed` re-check refuses to install a record if the bridge tore down mid-load |
 | `session/prompt` | `agent.send()` | supports ACP `text` and `resource_link` blocks; rejects image/audio/embedded resource and empty prompts; one in-flight prompt PER session (independent); settles on the OWNING turn's end (a turn that ends in `error` rejects the RPC) |
 | `session/cancel` | `agent.cancel()` | the queue-aware cancel: aborts a running step, clears queued + steering work, and drops a turn about to start, then settles the prompt `cancelled` — for ONLY that session (a cancel never touches another session's stream or prompt) |
-| `session/update` | `session/event` | `agent_message_chunk` (text-delta), `agent_thought_chunk` (reasoning-delta), `user_message_chunk` (load replay), `tool_call`/`tool_call_update` (title/kind/rawInput/content/locations owned by the TOOL via `presentCall`/`presentResult` — see Tool-call presentation) |
+| `session/update` | `session/event` | `agent_message_chunk` (text-delta), `agent_thought_chunk` (reasoning-delta), `user_message_chunk` (load replay), `tool_call`/`tool_call_update` (the render intent — a `card`-tagged `ToolCallView`/`ToolResultView` — owned by the TOOL via `presentCall`/`presentResult`, which the bridge switches on to build the wire shape — see Tool-call presentation) |
 
 ## Multi-session
 
@@ -42,18 +42,24 @@ Each session runs in its own workspace, recorded as the session's `SessionHeader
 
 ## Tool-call presentation
 
-How a tool call renders in the editor is owned by the TOOL, not the bridge — the bridge never special-cases tool names. Each tool may declare `presentCall(args)` (pending state: a human-readable `title`, a `kind` for the icon, the salient `rawInput` to show in a detail view, optional `content` blocks shown alongside, and optional `locations` — `{ path, line? }[]` files the call reads/modifies, forwarded as `tool_call.locations` so an editor can follow along) and `presentResult(args, result)` (completed state: an optional replacement `title` and reformatted `content`) on its `dsh-tools` definition. The bridge looks the definition up by name in `ctx.tools` and maps the neutral `ToolCallPresentation`/`ToolResultPresentation` to the ACP `tool_call`/`tool_call_update` wire shapes. A tool that declares neither gets a generic fallback (title = tool name, raw parsed args as `rawInput`, kind inferred from the name). For example `dsh-tool-bash` sets the title to the exact `command` ("ls -la src"), `kind: 'execute'`, the `command` as `rawInput`, the model `description` as a `content` text block, and wraps the completed output in a fenced ` ```console ` block; the `dsh-tool-fs` `read`/`write`/`edit` tools set a `Read/Write/Edit <path>` title, a `read`/`edit` kind, and a `locations` entry for the file. (The command is the title because an editor hides `rawInput` for execute-kind cards — Zed renders it only for non-terminal tools — and the reference adapters likewise use the command as an execute tool's title.)
+How a tool call renders in the editor is owned by the TOOL, not the bridge — the bridge never special-cases tool names. Each tool may declare `presentCall(args)` (pending state) and `presentResult(args, result)` (completed state) on its `dsh-tools` definition, each returning a **`card`-tagged render intent** — a discriminated union the bridge switches on. `presentCall` returns a `ToolCallView`, one of three cards:
 
-The `tool/result` session event carries only `{ callId, content, isError }` — not the tool name or args — so to call a tool's `presentResult` the bridge keeps a small per-session map from `callId` to the in-flight call's `(name, args)`, populated on `tool/call` and removed as each result is presented (it holds only currently-in-flight calls, never finished ones). This is bridge-local state — NOT a change to the event schema or a core service. The map lives on the `SessionRecord`, so two concurrent sessions never cross their in-flight tool state; a `session/load` replay uses a throwaway presenter that pairs each `tool/call` with its `tool/result` as the log replays in order, so replayed tool cards render identically to live ones.
+- `{ card: 'generic', title, kind?, rawInput?, content?, locations? }` — the default card: a human-readable `title`, a `kind` for the icon, the salient `rawInput` for a detail view, optional `content` blocks shown alongside, and optional `locations` (`FileLocation[]` = `{ path, line? }[]` files the call reads/modifies, forwarded as `tool_call.locations` so an editor can follow along).
+- `{ card: 'terminal', title, description?, cwd? }` — a shell command → a terminal card (see Terminal card).
+- `{ card: 'diff', title, diffs, locations? }` — a file create/modify → an inline diff card; `diffs` is `FileDiff[]` (`{ path, oldText, newText }`, `oldText: null` ⇒ new file). The bridge emits each diff as an ACP `{ type: 'diff', path, oldText, newText }` `tool_call.content` block, which Zed renders as an inline diff / new-file preview.
+
+`presentResult` returns a `ToolResultView`, one of three cards: `{ card: 'generic', title?, content? }` (an optional replacement `title` and reformatted `content`), `{ card: 'terminal', title?, output?, exitCode?, signal? }` (the captured run output + exit — see Terminal card), or `{ card: 'diff', title?, diffs }` (a completed file mutation → typically the applied hunks with context lines computed from the before/after content, or a whole-file diff for a create; a successful mutation ALWAYS returns this so the model-facing result text can't clobber the diff — an ACP `tool_call_update.content` replaces the call's content). The bridge looks the definition up by name in `ctx.tools` and `switch (view.card)`es to build the ACP `tool_call`/`tool_call_update` wire shape per card; a tool that declares neither gets a generic fallback (title = tool name, raw parsed args as `rawInput`, kind inferred from the name). For example `dsh-tool-bash` returns a `terminal` card for a foreground `bash` (title = the exact `command` "ls -la src", `description` = the model description); the `dsh-tool-fs` `write`/`edit` tools return a `diff` call card and a `diff` result card, and `read` returns a `generic` card (`kind: 'read'`, the read window in its title — `Read foo.txt (5 - 8)` — and a `locations` entry for the file). For a file card the bridge **relativizes the title** against the session cwd (mirroring `claude-agent-acp`'s `toDisplayPath` — `Read src/foo.ts`, not the absolute path) while keeping `locations[]`/`diffs[].path` **raw** so the editor opens the real path.
+
+The `tool/result` session event does not carry the tool name or args — so to call a tool's `presentResult` the bridge keeps a small per-session map from `callId` to the in-flight call's `(name, args)`, populated on `tool/call` and removed as each result is presented (it holds only currently-in-flight calls, never finished ones). This is bridge-local state — NOT a change to the event schema or a core service. The map lives on the `SessionRecord`, so two concurrent sessions never cross their in-flight tool state; a `session/load` replay uses a throwaway presenter that pairs each `tool/call` with its `tool/result` as the log replays in order, so replayed tool cards render identically to live ones.
 
 ## Terminal card (capability-gated)
 
-A tool whose call IS a shell command (`bash`) can render as a real **terminal card** — a working-directory header with the command's output and an exit-status pill — rather than a plain text block. The tool asks for this with the neutral `terminal` field on its presentation (`dsh-tools`: a `{ cwd?, output?, exitCode?, signal? }` shape on `ToolCallPresentation`/`ToolResultPresentation`); the bridge maps it to the Zed `_meta` convention, gated on the client advertising `clientCapabilities._meta.terminal_output` in `initialize`:
+A tool whose call IS a shell command (`bash`) can render as a real **terminal card** — a working-directory header with the command's output and an exit-status pill — rather than a plain text block. The tool asks for this with the `terminal` card variant of its render intent (`dsh-tools`: `{ card: 'terminal', title, description?, cwd? }` from `presentCall`, `{ card: 'terminal', title?, output?, exitCode?, signal? }` from `presentResult`); the bridge maps it to the Zed `_meta` convention, gated on the client advertising `clientCapabilities._meta.terminal_output` in `initialize`:
 
-- `tool_call`: `content:[…, {type:'terminal', terminalId}]` + `_meta.terminal_info.{terminal_id, cwd}` — the terminal id is the harness `callId`; the cwd is the tool's explicit absolute `terminal.cwd`, else a relative `terminal.cwd` resolved against the session cwd, else the session's workspace cwd (the bridge fills the default, since the pure tool presenter can't see it). Any pending `content` the tool supplied (e.g. bash's `description`) renders BEFORE the terminal block, so the description sits above the card.
-- `tool_call_update`: `_meta.terminal_output.{terminal_id, data}` (the captured output) plus `_meta.terminal_exit.{terminal_id, exit_code | signal}` when the tool reported a structured exit. In terminal mode the update's `content` is OMITTED — an ACP `tool_call_update.content` REPLACES the call's content, so sending the fenced text block would clobber the terminal content block from the call.
+- `tool_call`: `content:[…, {type:'terminal', terminalId}]` + `_meta.terminal_info.{terminal_id, cwd}` — the terminal id is the harness `callId`; the cwd is the card's explicit absolute `cwd`, else a relative `cwd` resolved against the session cwd, else the session's workspace cwd (the bridge fills the default, since the pure tool presenter can't see it). The card's `description` renders as a content block BEFORE the terminal block, so the description sits above the card.
+- `tool_call_update`: `_meta.terminal_output.{terminal_id, data}` (the terminal card's `output`) plus `_meta.terminal_exit.{terminal_id, exit_code | signal}` when the card reported a structured `exitCode`/`signal`. In terminal mode the update's `content` is OMITTED — an ACP `tool_call_update.content` REPLACES the call's content, so sending the fenced text block would clobber the terminal content block from the call.
 
-When the client does NOT advertise the capability, none of the `_meta`/terminal content is emitted: the `tool_call` shows the `description` content block and the `tool_call_update` carries the ` ```console ` text block (above) as the rendering — so a non-Zed client is never worse off. The `_meta` object is ACP's spec-blessed extensibility point; the specific `terminal_info`/`terminal_output`/`terminal_exit` keys are a Zed convention, not the ACP `terminal/create` sub-protocol (which would make the editor execute the command, bypassing `dsh-bash`'s sandbox/env-scrub/ownership/cwd). Live incremental streaming and command classification are follow-ups. See [the terminal-rendering RFC](../../../docs/rfc/implemented/feature/2026-06-18-acp-terminal-and-tool-rendering.md).
+When the client does NOT advertise the capability, none of the `_meta`/terminal content is emitted: the `tool_call` shows the `description` content block and the `tool_call_update` carries a ` ```console ` text block the bridge DERIVES by fencing the terminal result's `output` (the tool no longer double-encodes the fences) — so a non-Zed client is never worse off. The `_meta` object is ACP's spec-blessed extensibility point; the specific `terminal_info`/`terminal_output`/`terminal_exit` keys are a Zed convention, not the ACP `terminal/create` sub-protocol (which would make the editor execute the command, bypassing `dsh-bash`'s sandbox/env-scrub/ownership/cwd). Live incremental streaming and command classification are follow-ups. See [the terminal-rendering RFC](../../../docs/rfc/implemented/feature/2026-06-18-acp-terminal-and-tool-rendering.md) and [the render-intent-union RFC](../../../docs/rfc/implemented/architecture/2026-07-02-tool-render-intent-union.md).
 
 ## Settle-exactly-once
 

packages/ui/acp/acp-feature-support.md

@@ -99,7 +99,7 @@ Tool-call presentation is **owned by each tool** (`presentCall` / `presentResult
 | `ToolCallKind` mapping | S | ✅ | ✅ | ✅ | `execute`/`read`/`edit`/`other` inferred from the tool; richer mapping possible. |
 | `ToolCallStatus` | S | ✅ | ✅ | ✅ | `in_progress` → `completed`/`failed`. |
 | `content` blocks | S | ✅ | ✅ | ✅ | Text content; the description renders above the card. |
-| `diff` content | S | ❌ | ✅ | ✅ | No structured diff rendering for edits (would need a diffing edit tool + presenter). |
+| `diff` content | S | ✅ | ✅ | ✅ | The `write`/`edit` tools declare a `diff` render intent: `presentCall` → a call-time `{ card: 'diff' }` snippet, and `presentResult` → a result-time `{ card: 'diff' }`. For an edit or an overwrite it carries the applied hunk(s) with surrounding context (one per `replace_all` site), computed from the before/after text and persisted on the `tool/result` event as `meta`; for a create (no before-image) it is an args-derived whole-file diff. The bridge emits `{ type: 'diff', path, oldText, newText }` content blocks; a successful mutation ALWAYS returns the result diff (an ACP `tool_call_update.content` replaces the call's content, so the result diff — not the model-facing text — is what survives). |
 | `terminal` content | S | ✅ | ✅ | ✅ | Via the Zed `_meta` terminal convention (see below), not the spec `terminal/*` sub-protocol. |
 | `locations` (follow-along) | S | ✅ | ✅ | ✅ | The `read`/`write`/`edit` tools emit `{ path, line? }` file-location hints via `presentCall`. |
 | `rawInput` | S | ✅ | ⚠️ | ✅ | Parsed tool args surfaced as `rawInput`. |
@@ -147,7 +147,6 @@ Ranked by how commonly the reference adapters ship them and how much UX they unl
 5. **Slash commands** (`available_commands_update`).
 6. **MCP passthrough** (`mcpServers` on `session/new` + `mcpCapabilities`).
 7. **Richer prompt content** — image / embedded `resource` blocks (needs a multimodal model path).
-8. **Diff tool rendering** — structured `diff` content for edit tools (the `locations` follow-along hint already ships on `read`/`write`/`edit`).
 9. **Usage reporting** (`usage_update`) — the harness already records token usage internally (on `assistant/message`).
 10. **Editor filesystem delegation** (`fs/read_text_file` / `fs/write_text_file`) — lets the agent see unsaved buffers; lower priority since the harness has direct disk access.
 

packages/ui/acp/src/index.ts

@@ -36,7 +36,7 @@
 import type { Context } from 'cordis'
 import { Readable, Writable } from 'node:stream'
 import { randomUUID } from 'node:crypto'
-import { isAbsolute, resolve as resolvePath } from 'node:path'
+import { isAbsolute, relative as relativePath, resolve as resolvePath, sep as pathSep } from 'node:path'
 import Schema from 'schemastery'
 import {
   AgentSideConnection,
@@ -62,12 +62,12 @@ import {
   type StopReason,
 } from '@agentclientprotocol/sdk'
 import type { ContentBlock } from '@deepseek-ai/dsh-llm'
-import { CallId } from '@deepseek-ai/dsh-llm'
+import { assertNever, CallId } from '@deepseek-ai/dsh-llm'
 import type { Agent, AgentStatus } from '@deepseek-ai/dsh-agent'
 import { AgentId } from '@deepseek-ai/dsh-agent'
 import { SessionId } from '@deepseek-ai/dsh-session'
 import type { SessionEvent, TodoItem, TurnEndReason } from '@deepseek-ai/dsh-session'
-import type { ToolCallKind, ToolCallPresentation, ToolRegistry, ToolResultPresentation, ToolTerminal } from '@deepseek-ai/dsh-tools'
+import type { ToolCallKind, ToolCallView, ToolRegistry, ToolResultView, TerminalResultView } from '@deepseek-ai/dsh-tools'
 // Side-effect type import: declaration-merges `ctx.sessionPersistence` onto
 // Context (the bridge injects it and reads `list()` for load cwd validation).
 import type {} from '@deepseek-ai/dsh-session-persistence'
@@ -813,67 +813,13 @@ export function streamSessionEventUpdate(
       return
     }
     case 'tool/call': {
-      const present = presenter.call(event.data.callId, event.data.name, event.data.arguments)
-      // A terminal-rendered call (a shell command) gets a terminal CARD when the
-      // client supports it: a `terminal` content block plus `_meta.terminal_info`
-      // (the cwd header). Otherwise it is an ordinary tool_call and the output
-      // arrives as text on the result. See the terminal-rendering RFC.
-      const asTerminal = present.terminal !== undefined && terminal.enabled
-      // The tool's pending content (e.g. bash's `description`) renders ABOVE the
-      // card; when the card is shown, append the terminal block AFTER it so the
-      // description sits over the command (Zed renders content blocks in order).
-      // Without the capability the description still renders as the card's body.
-      const callContent: ({ type: 'content'; content: AcpContentBlock } | { type: 'terminal'; terminalId: string })[] = [
-        ...present.content !== undefined ? toolResultContent(present.content) : [],
-        ...asTerminal ? [{ type: 'terminal' as const, terminalId: event.data.callId }] : [],
-      ]
-      notify({
-        sessionId,
-        update: {
-          sessionUpdate: 'tool_call',
-          toolCallId: event.data.callId,
-          title: present.title,
-          kind: present.kind,
-          status: 'in_progress',
-          ...present.rawInput !== undefined ? { rawInput: present.rawInput } : {},
-          ...present.locations !== undefined ? { locations: present.locations } : {},
-          ...callContent.length > 0 ? { content: callContent } : {},
-          ...asTerminal
-            ? { _meta: { terminal_info: { terminal_id: event.data.callId, cwd: terminalCwd(present.terminal, terminal.cwd) } } }
-            : {},
-        },
-      })
+      const view = presenter.call(event.data.callId, event.data.name, event.data.arguments)
+      notify({ sessionId, update: toolCallUpdate(event.data.callId, view, terminal) })
       return
     }
     case 'tool/result': {
-      const present = presenter.result(event.data.callId, event.data.content, event.data.isError)
-      const term = present.terminal
-      // When the call rendered as a terminal AND the client is capable, the output
-      // and exit status ride on `_meta` (the terminal card consumes them) and the
-      // text `content` is OMITTED: a `tool_call_update.content` REPLACES the call's
-      // content collection in Zed, so sending the fenced ```console block here
-      // would clobber the terminal content block the call installed. The incapable
-      // path keeps sending `content` (the fenced fallback is the only rendering).
-      const asTerminal = term?.output !== undefined && terminal.enabled
-      const terminalResultMeta = asTerminal
-        ? {
-          _meta: {
-            terminal_output: { terminal_id: event.data.callId, data: term.output },
-            ...terminalExitMeta(event.data.callId, term),
-          },
-        }
-        : {}
-      notify({
-        sessionId,
-        update: {
-          sessionUpdate: 'tool_call_update',
-          toolCallId: event.data.callId,
-          status: event.data.isError ? 'failed' : 'completed',
-          ...asTerminal ? {} : { content: toolResultContent(present.content) },
-          ...present.title !== undefined ? { title: present.title } : {},
-          ...terminalResultMeta,
-        },
-      })
+      const view = presenter.result(event.data.callId, event.data.content, event.data.isError, event.data.meta)
+      notify({ sessionId, update: toolResultUpdate(event.data.callId, view, event.data.isError, terminal) })
       return
     }
     case 'todo/write': {
@@ -916,46 +862,20 @@ export interface TerminalRendering {
 /** Default: terminal rendering off (the ` ```console ` text fallback path). */
 const noTerminalRendering: TerminalRendering = { enabled: false, cwd: undefined }
 
-/**
- * Resolved pending-state presentation the bridge feeds into a `tool_call`
- * update: a title is always present (tool name when the tool gives none), `kind`
- * and `rawInput` are optional.
- */
-interface ResolvedCallPresentation {
-  title: string
-  kind: ToolCallKind
-  rawInput?: unknown
-  /** UI content shown on the pending call (e.g. a bash description text block above the card). */
-  content?: ContentBlock[]
-  /** Files this call reads/modifies (mapped to ACP `tool_call.locations`), for editor follow-along. */
-  locations?: { path: string; line?: number }[]
-  /** Tool's request to render as a terminal (the pending side carries the cwd). */
-  terminal?: ToolTerminal
-}
-
-/** Resolved completed-state presentation fed into a `tool_call_update`. */
-interface ResolvedResultPresentation {
-  /** UI content for the result (harness blocks; the tool may reformat, else the raw result). */
-  content: ContentBlock[]
-  /** Optional replacement title for the completed call. */
-  title?: string
-  /** Tool's terminal output/exit for a terminal-rendered call (the result side). */
-  terminal?: ToolTerminal
-}
-
 /**
  * Resolves tool-owned presentation for a session's tool-call events. A tool
- * declares `presentCall`/`presentResult` (see `dsh-tools`); this looks them up
- * by name in the registry and applies the generic fallback when a tool defines
- * neither.
+ * declares `presentCall`/`presentResult` (see `dsh-tools`) returning a
+ * `card`-tagged {@link ToolCallView}/{@link ToolResultView}; this looks them up
+ * by name in the registry and applies a generic fallback when a tool defines
+ * neither. The returned view is what {@link streamSessionEventUpdate} switches on.
  *
- * The `tool/result` session event carries only `{ callId, content, isError }` —
- * NOT the tool name or args — so to call a tool's `presentResult` (which needs
- * both), the presenter remembers each `tool/call`'s `{ name, args }` keyed by
- * callId and looks it up on the matching result. The map is bridge-LOCAL (not a
- * change to the event schema or a core service): one presenter per live session
- * (and a throwaway per `session/load` replay), and each entry is removed when
- * its result arrives. In the normal loop a `tool/call` is always followed by a
+ * The `tool/result` session event does NOT carry the tool name or args — so to
+ * call a tool's `presentResult` (which needs both), the presenter remembers each
+ * `tool/call`'s `{ name, args, card }` keyed by callId and looks it up on the
+ * matching result. The map is bridge-LOCAL (not a change to the event schema or a
+ * core service): one presenter per live session
+ * (and a throwaway per `session/load` replay), and each entry is removed when its
+ * result arrives. In the normal loop a `tool/call` is always followed by a
  * `tool/result` (the registry turns even a thrown tool into an isError result),
  * so the map holds only currently-in-flight calls. The one exception is a step
  * torn down mid-tool (an abort between `tool/call` and `tool/result`), which can
@@ -965,7 +885,7 @@ interface ResolvedResultPresentation {
  * stale entry's only cost is one map slot until the session ends.
  */
 export class ToolPresenter {
-  private readonly pending = new Map<CallId, { name: string; args: unknown; isTerminal: boolean }>()
+  private readonly pending = new Map<CallId, { name: string; args: unknown; card: ToolCallView['card'] }>()
 
   /**
    * @param tools the registry to resolve tool definitions by name.
@@ -980,10 +900,10 @@ export class ToolPresenter {
     private readonly onError: (message: string) => void = () => {},
   ) {}
 
-  /** Pending-state presentation for a `tool/call`; remembers `(name, args)` for the matching result. */
-  call(callId: CallId, name: string, argsJson: string): ResolvedCallPresentation {
+  /** Pending-state render intent for a `tool/call`; remembers `(name, args, card)` for the matching result. */
+  call(callId: CallId, name: string, argsJson: string): ToolCallView {
     const args = parseToolArguments(argsJson)
-    let present: ToolCallPresentation | undefined
+    let present: ToolCallView | undefined
     try {
       present = this.tools.get(name)?.presentCall?.(args)
     } catch (error: unknown) {
@@ -991,51 +911,37 @@ export class ToolPresenter {
       this.onError(`acp: tool "${name}" presentCall threw, using generic presentation: ${String(error)}`)
       present = undefined
     }
-    if (present === undefined) {
-      // No tool-owned presentation: fall back to the tool name as the title and
-      // the full parsed args as the raw input (the pre-seam behavior). A generic
-      // call is never a terminal, so a later result can't emit terminal output.
-      this.pending.set(callId, { name, args, isTerminal: false })
-      return { title: name, kind: toolKindFor(name), rawInput: args }
-    }
-    // Remember whether THIS call rendered as a terminal, so `result()` only emits
-    // terminal output/exit for a call that actually registered a terminal — a
-    // `presentResult().terminal` without a matching `presentCall().terminal`
-    // would otherwise orphan `_meta.terminal_output` to a terminal Zed never made.
-    this.pending.set(callId, { name, args, isTerminal: present.terminal !== undefined })
-    return {
-      title: present.title,
-      kind: present.kind ?? 'other',
-      rawInput: present.rawInput,
-      ...present.content !== undefined ? { content: present.content } : {},
-      ...present.locations !== undefined ? { locations: present.locations } : {},
-      ...present.terminal !== undefined ? { terminal: present.terminal } : {},
-    }
+    // No tool-owned presentation: fall back to the tool name as the title and the
+    // full parsed args as the raw input (the generic card).
+    const view: ToolCallView = present ?? { card: 'generic', title: name, kind: toolKindFor(name), rawInput: args }
+    this.pending.set(callId, { name, args, card: view.card })
+    return view
   }
 
-  /** Completed-state presentation for a `tool/result`; consumes the remembered `(name, args)`. */
-  result(callId: CallId, content: ContentBlock[], isError: boolean): ResolvedResultPresentation {
+  /** Completed-state render intent for a `tool/result`; consumes the remembered `(name, args, card)`. */
+  result(callId: CallId, content: ContentBlock[], isError: boolean, meta?: unknown): ToolResultView {
     const call = this.pending.get(callId)
     this.pending.delete(callId)
     // No remembered call (unknown/late callId) → nothing to present from; raw content.
-    if (call === undefined) return { content }
-    let present: ToolResultPresentation | undefined
+    if (call === undefined) return { card: 'generic', content }
+    let present: ToolResultView | undefined
     try {
-      present = this.tools.get(call.name)?.presentResult?.(call.args, { content, isError })
+      present = this.tools.get(call.name)?.presentResult?.(call.args, { content, isError, ...meta !== undefined ? { meta } : {} })
     } catch (error: unknown) {
       // A throwing presentResult must not break streaming/replay: log + fall back.
       this.onError(`acp: tool "${call.name}" presentResult threw, using raw result: ${String(error)}`)
       present = undefined
     }
-    if (present === undefined) return { content }
-    return {
-      content: present.content ?? content,
-      ...present.title !== undefined ? { title: present.title } : {},
-      // Only propagate terminal output/exit when the PENDING call registered a
-      // terminal (finding: orphan terminal output otherwise). A result-only
-      // terminal with no matching call-side terminal is dropped.
-      ...present.terminal !== undefined && call.isTerminal ? { terminal: present.terminal } : {},
-    }
+    if (present === undefined) return { card: 'generic', content }
+    // Orphan guard: only honor a `terminal` result when the PENDING call was a
+    // terminal. A result-only terminal with no matching call-side terminal would
+    // orphan `_meta.terminal_output` to a terminal Zed never made — drop it back
+    // to the raw content.
+    if (present.card === 'terminal' && call.card !== 'terminal') return { card: 'generic', content }
+    // A generic result that reformats no content keeps the RAW result content
+    // (the tool replaced only the title); fill it so the card is never blanked.
+    if (present.card === 'generic' && present.content === undefined) return { ...present, content }
+    return present
   }
 }
 
@@ -1045,8 +951,8 @@ export class ToolPresenter {
  * results pass their raw content through unchanged.
  */
 export const nullToolPresenter: Pick<ToolPresenter, 'call' | 'result'> = {
-  call: (_callId, name, argsJson) => ({ title: name, kind: toolKindFor(name), rawInput: parseToolArguments(argsJson) }),
-  result: (_callId, content) => ({ content }),
+  call: (_callId, name, argsJson) => ({ card: 'generic', title: name, kind: toolKindFor(name), rawInput: parseToolArguments(argsJson) }),
+  result: (_callId, content) => ({ card: 'generic', content }),
 }
 
 /** Map a harness tool name to an ACP ToolKind (best-effort; default `other`). */
@@ -1079,20 +985,121 @@ function toolResultContent(blocks: ContentBlock[]): { type: 'content'; content:
   return out
 }
 
+/** The `session/update` payload for a `tool_call` / `tool_call_update`. */
+type ToolCallSessionUpdate = SessionNotification['update']
+
+/** An ACP tool-call content block (a text/image `content`, a `diff`, or a `terminal`). */
+type AcpToolCallContent =
+  | { type: 'content'; content: AcpContentBlock }
+  | { type: 'diff'; path: string; oldText: string | null; newText: string }
+  | { type: 'terminal'; terminalId: string }
+
 /**
- * Resolve the terminal card's header cwd. The tool's `terminal.cwd` (a model
- * `workdir`) wins when ABSOLUTE; a RELATIVE one resolves against the session
- * cwd (matching how `dsh-tool-bash` resolves a relative workdir for execution,
- * so the header matches where the command actually ran); when the tool gives no
- * cwd, the session workspace cwd is the default. Returns `undefined` only when
- * neither the tool nor the session supplies one (Zed then shows "current
- * directory").
+ * Relativize a file card's TITLE path against the session workspace cwd, so a
+ * card reads `Read src/foo.ts` rather than `/abs/proj/src/foo.ts` — matching the
+ * reference ACP adapter's `toDisplayPath`. Only the TITLE is relativized; the
+ * card's `locations`/`diff` paths stay RAW (the editor opens the real path). The
+ * pure tool presenter can't see the session cwd, so this happens here where the
+ * bridge knows it. The rewrite is an exact substring replace of the known raw
+ * path (a card carries the same path in `locations[0]`/`diffs[0]`), never a
+ * heuristic. A path outside the workspace, or an absent/relative session cwd, is
+ * left unchanged.
  */
-function terminalCwd(term: ToolTerminal | undefined, sessionCwd: string | undefined): string | undefined {
-  const toolCwd = term?.cwd
-  if (toolCwd === undefined) return sessionCwd
-  if (isAbsolute(toolCwd)) return toolCwd
-  return sessionCwd !== undefined ? resolvePath(sessionCwd, toolCwd) : toolCwd
+function displayTitle(title: string, rawPath: string | undefined, sessionCwd: string | undefined): string {
+  if (rawPath === undefined || sessionCwd === undefined || !isAbsolute(rawPath) || !isAbsolute(sessionCwd)) return title
+  const rel = relativePath(sessionCwd, rawPath)
+  // Only relativize a target that stays INSIDE the workspace. `relative` prefixes
+  // a `..` SEGMENT for a target above the cwd — test for the segment (`..` alone
+  // or `..<sep>…`), NOT a bare `..` char prefix, so a sibling like `..cache/x`
+  // (a real in-workspace name) still relativizes. Never relativize to the empty
+  // string (rawPath === cwd — a non-file target).
+  if (rel.length === 0 || rel === '..' || rel.startsWith(`..${pathSep}`)) return title
+  return title.split(rawPath).join(rel)
+}
+
+/**
+ * Resolve the terminal card's header cwd. A `TerminalCallView.cwd` (a model
+ * `workdir`) wins when ABSOLUTE; a RELATIVE one resolves against the session cwd
+ * (matching how `dsh-tool-bash` resolves a relative workdir for execution, so the
+ * header matches where the command actually ran); when the view gives no cwd, the
+ * session workspace cwd is the default. Returns `undefined` only when neither the
+ * view nor the session supplies one (Zed then shows "current directory").
+ */
+function terminalCwd(viewCwd: string | undefined, sessionCwd: string | undefined): string | undefined {
+  if (viewCwd === undefined) return sessionCwd
+  if (isAbsolute(viewCwd)) return viewCwd
+  return sessionCwd !== undefined ? resolvePath(sessionCwd, viewCwd) : viewCwd
+}
+
+/**
+ * Build the `tool_call` (pending) `session/update` from a tool's render intent.
+ * Switches on `view.card`: a `generic` card maps title/kind/rawInput/content/
+ * locations; a `diff` card emits `{ type: 'diff' }` content blocks (the editor's
+ * inline diff) plus follow-along locations; a `terminal` card renders as a
+ * terminal when the client is capable (a `terminal` content block + the
+ * `_meta.terminal_info` cwd header) and otherwise falls back to a generic execute
+ * card whose body is the description. File-card titles are relativized against the
+ * session cwd (see {@link displayTitle}).
+ */
+function toolCallUpdate(callId: CallId, view: ToolCallView, terminal: TerminalRendering): ToolCallSessionUpdate {
+  switch (view.card) {
+    case 'generic':
+      return {
+        sessionUpdate: 'tool_call',
+        toolCallId: callId,
+        // Relativize the title against the session cwd when the card carries a
+        // file location (a read/file card); a location-less card (bash, todo)
+        // has no path to relativize, so the title is used as-is.
+        title: displayTitle(view.title, view.locations?.[0]?.path, terminal.cwd),
+        kind: view.kind ?? 'other',
+        status: 'in_progress',
+        ...view.rawInput !== undefined ? { rawInput: view.rawInput } : {},
+        ...view.locations !== undefined ? { locations: view.locations } : {},
+        ...view.content !== undefined && view.content.length > 0 ? { content: toolResultContent(view.content) } : {},
+      }
+    case 'diff': {
+      const rawPath = view.locations?.[0]?.path ?? view.diffs[0]?.path
+      const content: AcpToolCallContent[] = view.diffs.map(d => ({ type: 'diff', path: d.path, oldText: d.oldText, newText: d.newText }))
+      return {
+        sessionUpdate: 'tool_call',
+        toolCallId: callId,
+        title: displayTitle(view.title, rawPath, terminal.cwd),
+        kind: 'edit',
+        status: 'in_progress',
+        ...view.locations !== undefined ? { locations: view.locations } : {},
+        ...content.length > 0 ? { content } : {},
+      }
+    }
+    case 'terminal': {
+      // A terminal-rendered call gets a terminal CARD when the client supports it:
+      // the description renders ABOVE the card, then the terminal block, plus
+      // `_meta.terminal_info` (the cwd header). Without the capability it is an
+      // ordinary execute card whose body is the description and whose rawInput is
+      // the command; the output arrives as text on the result.
+      const asTerminal = terminal.enabled
+      const description: AcpToolCallContent[] = view.description !== undefined
+        ? [{ type: 'content', content: { type: 'text', text: view.description } }]
+        : []
+      const content: AcpToolCallContent[] = [
+        ...description,
+        ...asTerminal ? [{ type: 'terminal' as const, terminalId: callId }] : [],
+      ]
+      return {
+        sessionUpdate: 'tool_call',
+        toolCallId: callId,
+        title: view.title,
+        kind: 'execute',
+        status: 'in_progress',
+        rawInput: view.title,
+        ...content.length > 0 ? { content } : {},
+        ...asTerminal
+          ? { _meta: { terminal_info: { terminal_id: callId, cwd: terminalCwd(view.cwd, terminal.cwd) } } }
+          : {},
+      }
+    }
+    default:
+      return assertNever(view, 'ToolCallView.card')
+  }
 }
 
 /** The `terminal_exit` `_meta` entry for a completed terminal call. */
@@ -1102,12 +1109,89 @@ interface TerminalExitMeta {
 
 /**
  * Build the optional `terminal_exit` portion of a `tool_call_update`'s `_meta`
- * from the tool's terminal result: a `signal` death yields `{signal}`, an
- * `exitCode` yields `{exit_code}`, and neither yields nothing (the card simply
- * shows no exit pill). Spread into the `_meta` object alongside `terminal_output`.
+ * from a terminal result: a `signal` death yields `{signal}`, an `exitCode`
+ * yields `{exit_code}`, and neither yields nothing (the card simply shows no exit
+ * pill). Spread into the `_meta` object alongside `terminal_output`.
  */
-function terminalExitMeta(callId: string, term: ToolTerminal): TerminalExitMeta {
-  if (term.signal !== undefined) return { terminal_exit: { terminal_id: callId, signal: term.signal } }
-  if (term.exitCode !== undefined) return { terminal_exit: { terminal_id: callId, exit_code: term.exitCode } }
+function terminalExitMeta(callId: string, view: TerminalResultView): TerminalExitMeta {
+  if (view.signal !== undefined) return { terminal_exit: { terminal_id: callId, signal: view.signal } }
+  if (view.exitCode !== undefined) return { terminal_exit: { terminal_id: callId, exit_code: view.exitCode } }
   return {}
 }
+
+/**
+ * Build the `tool_call_update` (completed) `session/update` from a result render
+ * intent. A `generic` result sends its reformatted content (or the raw result);
+ * a `terminal` result rides its output/exit on `_meta` when the client is capable
+ * (the terminal card consumes them and `content` is OMITTED — a
+ * `tool_call_update.content` REPLACES the call's content collection in Zed, so
+ * re-sending would clobber the terminal block the call installed) and otherwise
+ * derives the fenced ```console fallback from `output`. A `diff` result emits its
+ * `{ type: 'diff' }` content blocks (an applied hunk, or a whole-file diff for a
+ * create), which replace the diff the call installed — so the model-facing result
+ * text can never clobber it.
+ */
+function toolResultUpdate(callId: CallId, view: ToolResultView, isError: boolean, terminal: TerminalRendering): ToolCallSessionUpdate {
+  const status = isError ? 'failed' as const : 'completed' as const
+  switch (view.card) {
+    case 'terminal': {
+      const output = view.output ?? ''
+      if (terminal.enabled) {
+        return {
+          sessionUpdate: 'tool_call_update',
+          toolCallId: callId,
+          status,
+          ...view.title !== undefined ? { title: view.title } : {},
+          _meta: {
+            terminal_output: { terminal_id: callId, data: output },
+            ...terminalExitMeta(callId, view),
+          },
+        }
+      }
+      // No terminal capability: the bridge derives the fenced ```console fallback.
+      const fenced = `\`\`\`console\n${output.replace(/\n+$/, '')}\n\`\`\``
+      return {
+        sessionUpdate: 'tool_call_update',
+        toolCallId: callId,
+        status,
+        content: [{ type: 'content', content: { type: 'text', text: fenced } }],
+        ...view.title !== undefined ? { title: view.title } : {},
+      }
+    }
+    case 'generic':
+      return {
+        sessionUpdate: 'tool_call_update',
+        toolCallId: callId,
+        status,
+        // The presenter fills a generic result's content from the raw result, so
+        // `content` is always defined here; the guard keeps this total for a
+        // directly-constructed view.
+        /* v8 ignore next -- content always defined via the presenter (see above) */
+        ...view.content !== undefined ? { content: toolResultContent(view.content) } : {},
+        ...view.title !== undefined ? { title: view.title } : {},
+      }
+    case 'diff': {
+      // A result-time diff: emit one `{ type: 'diff' }` content block per entry
+      // (an applied hunk for an edit/overwrite, or a whole-file diff for a
+      // create), mirroring the call-side diff arm. `tool_call_update.content`
+      // REPLACES the call's content in an editor, so this result diff supersedes
+      // the diff the pending card installed (and keeps the model-facing result
+      // text from clobbering it).
+      const content: AcpToolCallContent[] = view.diffs.map(d => ({ type: 'diff', path: d.path, oldText: d.oldText, newText: d.newText }))
+      // Relativize the replacement title against the session cwd from the diff
+      // path, exactly as the call-side card does — `tool_call_update.title`
+      // replaces the card header, so a raw absolute path here would undo the
+      // pending card's relativized title.
+      const title = view.title !== undefined ? displayTitle(view.title, view.diffs[0]?.path, terminal.cwd) : undefined
+      return {
+        sessionUpdate: 'tool_call_update',
+        toolCallId: callId,
+        status,
+        ...content.length > 0 ? { content } : {},
+        ...title !== undefined ? { title } : {},
+      }
+    }
+    default:
+      return assertNever(view, 'ToolResultView.card')
+  }
+}

packages/ui/acp/tests/stream-update.spec.ts

@@ -163,7 +163,7 @@ describe('todosToPlan', () => {
 })
 
 describe('ToolPresenter (tool-owned presentation via the tool registry)', () => {
-  /** A tool whose presentCall/presentResult mirror what tool-bash declares. */
+  /** A tool whose presentCall/presentResult return generic-card views. */
   const bashLike: ToolDefinition = {
     name: 'bash',
     description: 'run a command',
@@ -171,9 +171,10 @@ describe('ToolPresenter (tool-owned presentation via the tool registry)', () =>
     execute: async () => [],
     presentCall: (args: unknown) => {
       const a = args as { command: string; description: string }
-      return { title: a.description, kind: 'execute', rawInput: a.command }
+      return { card: 'generic', title: a.description, kind: 'execute', rawInput: a.command }
     },
     presentResult: (_args: unknown, result: { content: { type: string }[] }) => ({
+      card: 'generic',
       content: [{ type: 'text', text: `wrapped:${result.content.length}` }],
     }),
   }
@@ -247,8 +248,8 @@ describe('ToolPresenter (tool-owned presentation via the tool registry)', () =>
       description: 'm',
       parameters: {},
       execute: async () => [],
-      presentCall: () => ({ title: 'Doing a thing' }),
-      presentResult: () => ({ title: 'Did the thing' }),
+      presentCall: () => ({ card: 'generic', title: 'Doing a thing' }),
+      presentResult: () => ({ card: 'generic', title: 'Did the thing' }),
     }
     const presenter = new ToolPresenter(registryOf(minimal))
     const updates = updatesWith(
@@ -336,11 +337,50 @@ describe('ToolPresenter (tool-owned presentation via the tool registry)', () =>
     expect(updates[1]).toMatchObject({ sessionUpdate: 'tool_call_update', content: [{ type: 'content', content: { type: 'text', text: 'raw' } }] })
   })
 
-  it('forwards a tool-owned `locations` onto the wire tool_call (REAL fs read/edit tools)', async () => {
+  it('an unknown render-intent card throws via the exhaustiveness guard (closed union)', () => {
+    // The bridge switches on `view.card` and ends with assertNever: a rogue card
+    // (only reachable by a cast — the union is closed) must throw, so adding a
+    // real variant later fails to compile at the switch instead of silently
+    // dropping the card.
+    const rogue: ToolDefinition = {
+      name: 'rogue',
+      description: 'r',
+      parameters: {},
+      execute: async () => [],
+      // A card value outside the union — forced with a cast (no valid input reaches this).
+      presentCall: () => ({ card: 'chart', title: 'nope' }) as unknown as ReturnType<NonNullable<ToolDefinition['presentCall']>>,
+    }
+    const presenter = new ToolPresenter(registryOf(rogue))
+    expect(() => updatesWith(presenter, evt('tool/call', {
+      turn: 1, step: 1, callId: CallId('c1'), name: 'rogue', arguments: '{}',
+    }))).toThrow('unreachable variant')
+  })
+
+  it('an unknown render-intent RESULT card throws via the exhaustiveness guard (closed union)', () => {
+    // The result-side renderer is also an exhaustive switch + assertNever: a rogue
+    // result card (only reachable by a cast) must throw, so adding a real result
+    // variant later fails to compile at the switch.
+    const rogue: ToolDefinition = {
+      name: 'rogue',
+      description: 'r',
+      parameters: {},
+      execute: async () => [],
+      presentCall: () => ({ card: 'generic', title: 'r' }),
+      presentResult: () => ({ card: 'chart' }) as unknown as ReturnType<NonNullable<ToolDefinition['presentResult']>>,
+    }
+    const presenter = new ToolPresenter(registryOf(rogue))
+    expect(() => updatesWith(
+      presenter,
+      evt('tool/call', { turn: 1, step: 1, callId: CallId('c1'), name: 'rogue', arguments: '{}' }),
+      evt('tool/result', { turn: 1, step: 1, callId: CallId('c1'), content: [{ type: 'text', text: 'x' }], isError: false }),
+    )).toThrow('unreachable variant')
+  })
+
+  it('forwards fs-tool render intents onto the wire (REAL read → generic locations, edit → diff content)', async () => {
     // Use the SHIPPING fs tools (not a stand-in), booted through their real
     // plugins, so the wire tool_call carries the actual presentCall output —
-    // including `locations` for editor follow-along. (AGENTS.md "prefer the real
-    // implementation over a mock".)
+    // read's follow-along `locations` and edit's `diff` content block. (AGENTS.md
+    // "prefer the real implementation over a mock".)
     const ctx = new Context()
     await ctx.plugin(SystemPrompt)
     await ctx.plugin(ToolRegistry)
@@ -352,44 +392,50 @@ describe('ToolPresenter (tool-owned presentation via the tool registry)', () =>
       turn: 1, step: 1, callId: CallId('r1'), name: 'read',
       arguments: JSON.stringify({ file_path: 'src/a.ts', offset: 12 }),
     }))
+    // A generic card: the read window is in the title, the offset drives the
+    // follow-along location line. No rawInput (the window lives in the title).
     expect(readCall).toMatchObject({
-      sessionUpdate: 'tool_call', toolCallId: 'r1', title: 'Read src/a.ts', kind: 'read',
-      rawInput: 'offset 12', locations: [{ path: 'src/a.ts', line: 12 }],
+      sessionUpdate: 'tool_call', toolCallId: 'r1', title: 'Read src/a.ts (from line 12)', kind: 'read',
+      locations: [{ path: 'src/a.ts', line: 12 }],
     })
+    expect((readCall as { rawInput?: unknown }).rawInput).toBeUndefined()
 
     const [editCall] = updatesWith(presenter, evt('tool/call', {
       turn: 1, step: 1, callId: CallId('e1'), name: 'edit',
       arguments: JSON.stringify({ file_path: 'src/b.ts', old_string: 'x', new_string: 'y' }),
     }))
+    // A diff card: `edit` kind, a `{ type: 'diff' }` content block carrying the
+    // literal old→new replacement, plus the follow-along location.
     expect(editCall).toMatchObject({
       sessionUpdate: 'tool_call', toolCallId: 'e1', title: 'Edit src/b.ts', kind: 'edit',
       locations: [{ path: 'src/b.ts' }],
+      content: [{ type: 'diff', path: 'src/b.ts', oldText: 'x', newText: 'y' }],
     })
     await ctx.fiber.dispose()
   })
 })
 
 describe('terminal-card mapping (capability-gated)', () => {
-  // A tool that asks to render as a terminal — a stand-in for tool-bash's shape,
-  // letting us drive the bridge's terminal mapping without the real executor.
-  type CallTerm = { cwd?: string } | undefined
-  type ResultTerm = { output?: string; exitCode?: number; signal?: string } | undefined
-  const termTool = (callTerminal: CallTerm, resultTerminal: ResultTerm): ToolDefinition => ({
+  // A tool that renders as a terminal — a stand-in for tool-bash's shape, letting
+  // us drive the bridge's terminal mapping without the real executor. `callCard`
+  // selects a terminal call view (optionally with a cwd) or a generic one (for the
+  // orphan-guard test); `resultTerminal` is the terminal result view's output/exit.
+  type CallCard = { card: 'terminal'; cwd?: string } | { card: 'generic' }
+  type ResultTerm = { title?: string; output?: string; exitCode?: number; signal?: string }
+  const termTool = (callCard: CallCard, resultTerminal: ResultTerm): ToolDefinition => ({
     name: 'bash',
     description: 'run a command',
     parameters: {},
     execute: async () => [],
-    presentCall: (args: unknown) => ({
-      title: (args as { command: string }).command,
-      kind: 'execute',
-      rawInput: (args as { command: string }).command,
-      content: [{ type: 'text', text: (args as { description: string }).description }],
-      ...callTerminal !== undefined ? { terminal: callTerminal } : {},
-    }),
-    presentResult: () => ({
-      content: [{ type: 'text', text: 'fallback' }],
-      ...resultTerminal !== undefined ? { terminal: resultTerminal } : {},
-    }),
+    presentCall: (args: unknown) => {
+      const command = (args as { command: string }).command
+      const description = (args as { description: string }).description
+      if (callCard.card === 'terminal') {
+        return { card: 'terminal', title: command, description, ...callCard.cwd !== undefined ? { cwd: callCard.cwd } : {} }
+      }
+      return { card: 'generic', title: command, kind: 'execute', rawInput: command, content: [{ type: 'text', text: description }] }
+    },
+    presentResult: () => ({ card: 'terminal', ...resultTerminal }),
   })
 
   const callEvent = evt('tool/call', { turn: 1, step: 1, callId: CallId('c1'), name: 'bash', arguments: JSON.stringify({ command: 'echo hi', description: 'Greet' }) })
@@ -403,7 +449,7 @@ describe('terminal-card mapping (capability-gated)', () => {
   }
 
   it('capability ON: description content THEN terminal block; cwd from the session header when the tool gives none', () => {
-    const [call, update] = termUpdates(termTool({}, { output: 'hi\n', exitCode: 0 }), true, '/work/proj', callEvent, resultEvent)
+    const [call, update] = termUpdates(termTool({ card: 'terminal' }, { output: 'hi\n', exitCode: 0 }), true, '/work/proj', callEvent, resultEvent)
     expect(call).toMatchObject({
       sessionUpdate: 'tool_call',
       content: [
@@ -422,33 +468,33 @@ describe('terminal-card mapping (capability-gated)', () => {
   })
 
   it('capability ON: an ABSOLUTE tool cwd wins; a RELATIVE one resolves against the session cwd', () => {
-    const [absCall] = termUpdates(termTool({ cwd: '/explicit/abs' }, { output: 'x' }), true, '/work/proj', callEvent)
+    const [absCall] = termUpdates(termTool({ card: 'terminal', cwd: '/explicit/abs' }, { output: 'x' }), true, '/work/proj', callEvent)
     expect((absCall as unknown as { _meta: { terminal_info: { cwd: string } } })._meta.terminal_info.cwd).toBe('/explicit/abs')
-    const [relCall] = termUpdates(termTool({ cwd: 'sub/dir' }, { output: 'x' }), true, '/work/proj', callEvent)
+    const [relCall] = termUpdates(termTool({ card: 'terminal', cwd: 'sub/dir' }, { output: 'x' }), true, '/work/proj', callEvent)
     // Relative workdir resolved against the session cwd — the card header matches
     // where execution actually ran (tool-bash resolves the same way).
     expect((relCall as unknown as { _meta: { terminal_info: { cwd: string } } })._meta.terminal_info.cwd).toBe('/work/proj/sub/dir')
     // No session cwd to resolve against → the relative tool cwd is passed through as-is.
-    const [noSessionCwd] = termUpdates(termTool({ cwd: 'rel/only' }, { output: 'x' }), true, undefined, callEvent)
+    const [noSessionCwd] = termUpdates(termTool({ card: 'terminal', cwd: 'rel/only' }, { output: 'x' }), true, undefined, callEvent)
     expect((noSessionCwd as unknown as { _meta: { terminal_info: { cwd: string } } })._meta.terminal_info.cwd).toBe('rel/only')
   })
 
   it('capability ON: a signal kill maps to terminal_exit.signal', () => {
-    const [, update] = termUpdates(termTool({}, { output: 'gone', signal: 'SIGKILL' }), true, '/w', callEvent, resultEvent)
+    const [, update] = termUpdates(termTool({ card: 'terminal' }, { output: 'gone', signal: 'SIGKILL' }), true, '/w', callEvent, resultEvent)
     expect((update as unknown as { _meta: { terminal_exit: unknown } })._meta.terminal_exit).toEqual({ terminal_id: 'c1', signal: 'SIGKILL' })
   })
 
   it('capability ON: a terminal result with output but NO exit/signal emits terminal_output and NO exit pill', () => {
     // A terminal-rendering tool that reports no structured exit (neither exitCode
     // nor signal) — the card shows output but no exit pill.
-    const [, update] = termUpdates(termTool({}, { output: 'partial' }), true, '/w', callEvent, resultEvent)
+    const [, update] = termUpdates(termTool({ card: 'terminal' }, { output: 'partial' }), true, '/w', callEvent, resultEvent)
     const meta = (update as unknown as { _meta: { terminal_output?: unknown; terminal_exit?: unknown } })._meta
     expect(meta.terminal_output).toEqual({ terminal_id: 'c1', data: 'partial' })
     expect(meta.terminal_exit).toBeUndefined()
   })
 
-  it('capability OFF: no terminal block or _meta; the description content and fenced result still render', () => {
-    const [call, update] = termUpdates(termTool({}, { output: 'hi\n' }), false, '/work/proj', callEvent, resultEvent)
+  it('capability OFF: no terminal block or _meta; the description content and the bridge-derived fenced result render', () => {
+    const [call, update] = termUpdates(termTool({ card: 'terminal' }, { output: 'hi\n' }), false, '/work/proj', callEvent, resultEvent)
     expect(call).toEqual({
       sessionUpdate: 'tool_call',
       toolCallId: 'c1',
@@ -458,24 +504,311 @@ describe('terminal-card mapping (capability-gated)', () => {
       rawInput: 'echo hi',
       content: [{ type: 'content', content: { type: 'text', text: 'Greet' } }],
     })
+    // The bridge derives the fenced ```console fallback from the terminal output.
     expect(update).toEqual({
       sessionUpdate: 'tool_call_update',
       toolCallId: 'c1',
       status: 'completed',
-      content: [{ type: 'content', content: { type: 'text', text: 'fallback' } }],
+      content: [{ type: 'content', content: { type: 'text', text: '```console\nhi\n```' } }],
     })
   })
 
-  it('orphan guard: a result-side terminal with NO call-side terminal is dropped (no orphan terminal_output)', () => {
-    // presentCall declares NO terminal, but presentResult returns one — the
-    // bridge must not emit _meta.terminal_output for a terminal Zed never made.
-    const [call, update] = termUpdates(termTool(undefined, { output: 'hi\n', exitCode: 0 }), true, '/w', callEvent, resultEvent)
-    // The call had no terminal → ordinary tool_call (description content, no _meta).
+  it('orphan guard: a result-side terminal with a GENERIC call is dropped (no orphan terminal_output)', () => {
+    // presentCall is a generic card, but presentResult returns a terminal view —
+    // the bridge must not emit _meta.terminal_output for a terminal Zed never made.
+    const [call, update] = termUpdates(termTool({ card: 'generic' }, { output: 'hi\n', exitCode: 0 }), true, '/w', callEvent, resultEvent)
+    // The call was generic → ordinary tool_call (description content, no _meta).
     expect((call as { _meta?: unknown })._meta).toBeUndefined()
     expect((call as { content: unknown }).content).toEqual([{ type: 'content', content: { type: 'text', text: 'Greet' } }])
-    // The result falls back to text content; NO terminal _meta.
+    // The result falls back to the RAW result content (the tool/result event's text); NO terminal _meta.
     expect((update as { _meta?: unknown })._meta).toBeUndefined()
-    expect((update as { content: unknown }).content).toEqual([{ type: 'content', content: { type: 'text', text: 'fallback' } }])
+    expect((update as { content: unknown }).content).toEqual([{ type: 'content', content: { type: 'text', text: 'hi\n' } }])
+  })
+
+  it('capability ON: a terminal result title replaces the completed-card title; missing output emits empty data', () => {
+    // A terminal result MAY carry a replacement title and MAY omit output (a run
+    // that produced nothing) — the _meta carries empty data, not a dropped key.
+    const [, update] = termUpdates(termTool({ card: 'terminal' }, { title: 'Ran echo', exitCode: 0 }), true, '/w', callEvent, resultEvent)
+    expect(update).toEqual({
+      sessionUpdate: 'tool_call_update',
+      toolCallId: 'c1',
+      status: 'completed',
+      title: 'Ran echo',
+      _meta: { terminal_output: { terminal_id: 'c1', data: '' }, terminal_exit: { terminal_id: 'c1', exit_code: 0 } },
+    })
+  })
+
+  it('capability OFF: a terminal result title rides on the fenced fallback update', () => {
+    const [, update] = termUpdates(termTool({ card: 'terminal' }, { title: 'Ran echo', output: 'hi\n' }), false, '/w', callEvent, resultEvent)
+    expect(update).toEqual({
+      sessionUpdate: 'tool_call_update',
+      toolCallId: 'c1',
+      status: 'completed',
+      content: [{ type: 'content', content: { type: 'text', text: '```console\nhi\n```' } }],
+      title: 'Ran echo',
+    })
+  })
+
+  it('a terminal call with NO description and NO capability is a bare execute card (no content key)', () => {
+    // A terminal view whose presentCall omits `description`, with the capability
+    // OFF: no description block and no terminal block → the card carries no content.
+    const noDesc: ToolDefinition = {
+      name: 'bash',
+      description: 'run a command',
+      parameters: {},
+      execute: async () => [],
+      presentCall: (args: unknown) => ({ card: 'terminal', title: (args as { command: string }).command }),
+    }
+    const [call] = termUpdates(noDesc, false, undefined, callEvent)
+    expect(call).toEqual({
+      sessionUpdate: 'tool_call',
+      toolCallId: 'c1',
+      title: 'echo hi',
+      kind: 'execute',
+      status: 'in_progress',
+      rawInput: 'echo hi',
+    })
+  })
+})
+
+describe('diff-card mapping', () => {
+  // A stand-in diff tool, letting us drive the bridge's diff arm across shapes
+  // the shipping fs tools don't emit (no locations, empty diffs).
+  const diffTool = (view: unknown): ToolDefinition => ({
+    name: 'writer',
+    description: 'writes a file',
+    parameters: {},
+    execute: async () => [],
+    presentCall: () => view as ReturnType<NonNullable<ToolDefinition['presentCall']>>,
+  })
+  function callUpdate(tool: ToolDefinition, cwd: string | undefined): SessionNotification['update'] {
+    const presenter = new ToolPresenter(registryOf(tool))
+    const out: SessionNotification['update'][] = []
+    streamSessionEventUpdate(
+      SessionId('s1'),
+      evt('tool/call', { turn: 1, step: 1, callId: CallId('c1'), name: 'writer', arguments: '{}' }),
+      n => out.push(n.update),
+      presenter,
+      { enabled: false, cwd },
+    )
+    return out[0]!
+  }
+
+  it('a diff with NO locations relativizes the title off the first diff path; omits the locations key', () => {
+    const update = callUpdate(diffTool({ card: 'diff', title: 'Write /work/proj/a.txt', diffs: [{ path: '/work/proj/a.txt', oldText: null, newText: 'x' }] }), '/work/proj')
+    expect(update).toEqual({
+      sessionUpdate: 'tool_call',
+      toolCallId: 'c1',
+      title: 'Write a.txt',
+      kind: 'edit',
+      status: 'in_progress',
+      content: [{ type: 'diff', path: '/work/proj/a.txt', oldText: null, newText: 'x' }],
+    })
+  })
+
+  it('a diff with an EMPTY diffs array omits the content key (no diff blocks to send)', () => {
+    const update = callUpdate(diffTool({ card: 'diff', title: 'Write nothing', diffs: [] }), undefined)
+    expect(update).toEqual({
+      sessionUpdate: 'tool_call',
+      toolCallId: 'c1',
+      title: 'Write nothing',
+      kind: 'edit',
+      status: 'in_progress',
+    })
+  })
+})
+
+describe('result-time diff card (REAL fs edit tool → tool_call_update diff blocks)', () => {
+  // Drive the SHIPPING fs edit tool through the bridge: the pending tool/call
+  // installs the call-time snippet, then the tool/result carries the tool's
+  // computed applied-hunk `meta`, which presentResult narrows into a `diff`
+  // result card the bridge forwards as `{ type: 'diff' }` content blocks. Uses
+  // the REAL tool (not a stand-in) per the anti-mock convention, mirroring the
+  // call-side diff test above.
+  async function fsCtx(): Promise<Context> {
+    const ctx = new Context()
+    await ctx.plugin(SystemPrompt)
+    await ctx.plugin(ToolRegistry)
+    await ctx.plugin(FsLocal)
+    await ctx.plugin(ToolFs)
+    return ctx
+  }
+
+  function updatesWith(presenter: ToolPresenter, ...events: SessionEvent[]): SessionNotification['update'][] {
+    const out: SessionNotification['update'][] = []
+    for (const event of events) streamSessionEventUpdate(SessionId('s1'), event, n => out.push(n.update), presenter)
+    return out
+  }
+
+  it('forwards the applied-hunk meta onto the wire as tool_call_update diff content', async () => {
+    const ctx = await fsCtx()
+    const presenter = new ToolPresenter(ctx.tools)
+    const args = JSON.stringify({ file_path: 'src/b.ts', old_string: 'OLD', new_string: 'NEW' })
+    // The applied hunk the tool would compute and persist on the result meta.
+    const meta = { diffs: [{ path: 'src/b.ts', oldText: 'a\nOLD\nb', newText: 'a\nNEW\nb' }] }
+    const [, resultUpdate] = updatesWith(
+      presenter,
+      evt('tool/call', { turn: 1, step: 1, callId: CallId('e1'), name: 'edit', arguments: args }),
+      evt('tool/result', { turn: 1, step: 1, callId: CallId('e1'), content: [{ type: 'text', text: 'ok' }], isError: false, meta }),
+    )
+    expect(resultUpdate).toEqual({
+      sessionUpdate: 'tool_call_update',
+      toolCallId: 'e1',
+      status: 'completed',
+      title: 'Edit src/b.ts',
+      content: [{ type: 'diff', path: 'src/b.ts', oldText: 'a\nOLD\nb', newText: 'a\nNEW\nb' }],
+    })
+    await ctx.fiber.dispose()
+  })
+
+  it('an error result carries NO diff card (falls back to raw content)', async () => {
+    const ctx = await fsCtx()
+    const presenter = new ToolPresenter(ctx.tools)
+    const args = JSON.stringify({ file_path: 'src/b.ts', old_string: 'OLD', new_string: 'NEW' })
+    const [, resultUpdate] = updatesWith(
+      presenter,
+      evt('tool/call', { turn: 1, step: 1, callId: CallId('e1'), name: 'edit', arguments: args }),
+      evt('tool/result', { turn: 1, step: 1, callId: CallId('e1'), content: [{ type: 'text', text: 'Error: boom' }], isError: true }),
+    )
+    expect(resultUpdate).toMatchObject({ sessionUpdate: 'tool_call_update', status: 'failed' })
+    expect(resultUpdate).not.toHaveProperty('content', expect.arrayContaining([expect.objectContaining({ type: 'diff' })]))
+    await ctx.fiber.dispose()
+  })
+
+  it('the completed diff TITLE relativizes against the session cwd (the result title replaces the card header)', async () => {
+    // A `tool_call_update.title` replaces the card header, so the result-side
+    // diff must relativize its title exactly as the pending card did — otherwise
+    // a completed absolute-path edit flips `Edit src/b.ts` back to the raw
+    // absolute path. The diff/location paths stay absolute (the editor opens the
+    // real path). Drive the REAL fs edit tool with an absolute in-workspace path.
+    const ctx = await fsCtx()
+    const presenter = new ToolPresenter(ctx.tools)
+    const args = JSON.stringify({ file_path: '/work/proj/src/b.ts', old_string: 'OLD', new_string: 'NEW' })
+    const meta = { diffs: [{ path: '/work/proj/src/b.ts', oldText: 'a\nOLD\nb', newText: 'a\nNEW\nb' }] }
+    const out: SessionNotification['update'][] = []
+    const rendering = { enabled: false, cwd: '/work/proj' }
+    for (const event of [
+      evt('tool/call', { turn: 1, step: 1, callId: CallId('e1'), name: 'edit', arguments: args }),
+      evt('tool/result', { turn: 1, step: 1, callId: CallId('e1'), content: [{ type: 'text', text: 'ok' }], isError: false, meta }),
+    ]) streamSessionEventUpdate(SessionId('s1'), event, n => out.push(n.update), presenter, rendering)
+    expect(out[1]).toEqual({
+      sessionUpdate: 'tool_call_update',
+      toolCallId: 'e1',
+      status: 'completed',
+      title: 'Edit src/b.ts',
+      content: [{ type: 'diff', path: '/work/proj/src/b.ts', oldText: 'a\nOLD\nb', newText: 'a\nNEW\nb' }],
+    })
+    await ctx.fiber.dispose()
+  })
+
+  it('a diff result with an EMPTY diffs array and no title omits both keys (nothing to send)', () => {
+    // A synthetic tool whose presentResult yields a `diff` card with no hunks and
+    // no title — the shipping fs tools never emit this (edit always has a hunk;
+    // write always falls back to a whole-file diff), so a stand-in is the only way
+    // to exercise the empty-content AND absent-title branches of the result-side
+    // diff arm.
+    const emptyDiffTool: ToolDefinition = {
+      name: 'writer',
+      description: 'writes a file',
+      parameters: {},
+      execute: async () => [],
+      presentCall: () => ({ card: 'diff', title: 'Write x', diffs: [{ path: 'x', oldText: null, newText: 'y' }] }),
+      presentResult: () => ({ card: 'diff', diffs: [] }),
+    }
+    const presenter = new ToolPresenter(registryOf(emptyDiffTool))
+    const [, resultUpdate] = updatesWith(
+      presenter,
+      evt('tool/call', { turn: 1, step: 1, callId: CallId('w1'), name: 'writer', arguments: '{}' }),
+      evt('tool/result', { turn: 1, step: 1, callId: CallId('w1'), content: [{ type: 'text', text: 'ok' }], isError: false }),
+    )
+    expect(resultUpdate).toEqual({
+      sessionUpdate: 'tool_call_update',
+      toolCallId: 'w1',
+      status: 'completed',
+    })
+    expect(resultUpdate).not.toHaveProperty('content')
+    expect(resultUpdate).not.toHaveProperty('title')
+  })
+})
+
+describe('relative-path display titles (bridge relativizes the title against the session cwd)', () => {
+  // The bridge relativizes a file card's TITLE against the session workspace cwd
+  // (mirroring the reference adapter's toDisplayPath), while leaving locations/
+  // diff paths RAW. Drive it with the REAL fs tools so the title/locations come
+  // from the shipping presentCall, and pass an ABSOLUTE file path (which a real
+  // editor forwards). The presenter is pure/args-only; the cwd is known only here.
+  async function fsCtx(): Promise<Context> {
+    const ctx = new Context()
+    await ctx.plugin(SystemPrompt)
+    await ctx.plugin(ToolRegistry)
+    await ctx.plugin(FsLocal)
+    await ctx.plugin(ToolFs)
+    return ctx
+  }
+  function callUpdate(ctx: Context, sessionCwd: string | undefined, name: string, args: unknown): SessionNotification['update'] {
+    const presenter = new ToolPresenter(ctx.tools)
+    const out: SessionNotification['update'][] = []
+    streamSessionEventUpdate(
+      SessionId('s1'),
+      evt('tool/call', { turn: 1, step: 1, callId: CallId('c1'), name, arguments: JSON.stringify(args) }),
+      n => out.push(n.update),
+      presenter,
+      { enabled: false, cwd: sessionCwd },
+    )
+    return out[0]!
+  }
+
+  it('read: an absolute path inside the workspace relativizes the TITLE; the location path stays absolute', async () => {
+    const ctx = await fsCtx()
+    const update = callUpdate(ctx, '/work/proj', 'read', { file_path: '/work/proj/src/a.ts', offset: 5 })
+    expect(update).toMatchObject({
+      title: 'Read src/a.ts (from line 5)',
+      locations: [{ path: '/work/proj/src/a.ts', line: 5 }],
+    })
+    await ctx.fiber.dispose()
+  })
+
+  it('edit: the diff TITLE relativizes; the diff/location paths stay absolute (the editor opens the real path)', async () => {
+    const ctx = await fsCtx()
+    const update = callUpdate(ctx, '/work/proj', 'edit', { file_path: '/work/proj/src/b.ts', old_string: 'x', new_string: 'y' })
+    expect(update).toMatchObject({
+      title: 'Edit src/b.ts',
+      locations: [{ path: '/work/proj/src/b.ts' }],
+      content: [{ type: 'diff', path: '/work/proj/src/b.ts', oldText: 'x', newText: 'y' }],
+    })
+    await ctx.fiber.dispose()
+  })
+
+  it('a path OUTSIDE the workspace is left as-is (no `..` title)', async () => {
+    const ctx = await fsCtx()
+    const update = callUpdate(ctx, '/work/proj', 'read', { file_path: '/etc/passwd' })
+    expect((update as { title: string }).title).toBe('Read /etc/passwd')
+    await ctx.fiber.dispose()
+  })
+
+  it('an in-workspace file whose relative form starts with `..` chars (a sibling name) still relativizes', async () => {
+    // `/work/proj/..cache/x` is INSIDE the workspace — its relative form
+    // `..cache/x` begins with the chars `..` but is NOT a parent segment. The
+    // guard tests for a `..` SEGMENT, so this relativizes (matching the reference
+    // adapter, which accepts any target under `cwd + sep`).
+    const ctx = await fsCtx()
+    const update = callUpdate(ctx, '/work/proj', 'read', { file_path: '/work/proj/..cache/x.ts' })
+    expect((update as { title: string }).title).toBe('Read ..cache/x.ts')
+    await ctx.fiber.dispose()
+  })
+
+  it('no session cwd → the absolute title is left unchanged', async () => {
+    const ctx = await fsCtx()
+    const update = callUpdate(ctx, undefined, 'read', { file_path: '/work/proj/src/a.ts' })
+    expect((update as { title: string }).title).toBe('Read /work/proj/src/a.ts')
+    await ctx.fiber.dispose()
+  })
+
+  it('a relative path is passed through unchanged (already display-friendly)', async () => {
+    const ctx = await fsCtx()
+    const update = callUpdate(ctx, '/work/proj', 'read', { file_path: 'src/a.ts' })
+    expect((update as { title: string }).title).toBe('Read src/a.ts')
+    await ctx.fiber.dispose()
   })
 })
 

packages/web/tool-web/src/fetch.ts

@@ -7,7 +7,7 @@
 
 import type { Context } from 'cordis'
 import { defineTool } from '@deepseek-ai/dsh-tools'
-import type { ToolCallPresentation } from '@deepseek-ai/dsh-tools'
+import type { GenericCallView } from '@deepseek-ai/dsh-tools'
 import type { ContentBlock } from '@deepseek-ai/dsh-llm'
 import type { WebFetchBody, WebFetchResult } from '@deepseek-ai/dsh-web'
 import { assertNever } from '@deepseek-ai/dsh-llm'
@@ -44,8 +44,8 @@ export function formatFetchOutput(result: WebFetchResult): string {
 }
 
 /** Pending-call presentation: a fetch card titled by the URL. */
-export function presentFetchCall(args: { url: string; timeout_ms?: number }): ToolCallPresentation {
-  return { title: args.url, kind: 'fetch', rawInput: args.url }
+export function presentFetchCall(args: { url: string; timeout_ms?: number }): GenericCallView {
+  return { card: 'generic', title: args.url, kind: 'fetch', rawInput: args.url }
 }
 
 /** Register the `web_fetch` tool and its system-prompt guidance. */

packages/web/tool-web/src/search.ts

@@ -7,7 +7,7 @@
 
 import type { Context } from 'cordis'
 import { defineTool } from '@deepseek-ai/dsh-tools'
-import type { ToolCallPresentation } from '@deepseek-ai/dsh-tools'
+import type { GenericCallView } from '@deepseek-ai/dsh-tools'
 import type { ContentBlock } from '@deepseek-ai/dsh-llm'
 import type { WebSearchResult } from '@deepseek-ai/dsh-web'
 import type {} from '@deepseek-ai/dsh-system-prompt'
@@ -63,8 +63,8 @@ export function formatSearchOutput(result: WebSearchResult): string {
 }
 
 /** Pending-call presentation: a search card titled by the query. */
-export function presentSearchCall(args: { query: string }): ToolCallPresentation {
-  return { title: args.query, kind: 'search', rawInput: args.query }
+export function presentSearchCall(args: { query: string }): GenericCallView {
+  return { card: 'generic', title: args.query, kind: 'search', rawInput: args.query }
 }
 
 /** Register the `web_search` tool and its system-prompt guidance. */

packages/web/tool-web/tests/tool-web.spec.ts

@@ -80,7 +80,7 @@ describe('search formatting', () => {
   })
 
   it('presents a search call as a search-kind card titled by the query', () => {
-    expect(presentSearchCall({ query: 'find me' })).toEqual({ title: 'find me', kind: 'search', rawInput: 'find me' })
+    expect(presentSearchCall({ query: 'find me' })).toEqual({ card: 'generic', title: 'find me', kind: 'search', rawInput: 'find me' })
   })
 })
 
@@ -116,7 +116,7 @@ describe('fetch formatting', () => {
   })
 
   it('presents a fetch call as a fetch-kind card titled by the url', () => {
-    expect(presentFetchCall({ url: 'https://a.test' })).toEqual({ title: 'https://a.test', kind: 'fetch', rawInput: 'https://a.test' })
+    expect(presentFetchCall({ url: 'https://a.test' })).toEqual({ card: 'generic', title: 'https://a.test', kind: 'fetch', rawInput: 'https://a.test' })
   })
 })
 

pnpm-lock.yaml

@@ -319,6 +319,10 @@ importers:
         version: 4.0.0-rc.6(@cordisjs/plugin-include@1.0.4)(@cordisjs/plugin-loader@1.0.0-rc.4)
 
   packages/fs/tool-fs:
+    dependencies:
+      diff:
+        specifier: ^9.0.0
+        version: 9.0.0
     devDependencies:
       '@deepseek-ai/dsh-agent':
         specifier: workspace:^
@@ -2295,6 +2299,10 @@ packages:
   devlop@1.1.0:
     resolution: {integrity: sha512-RWmIqhcFf1lRYBvNmr7qTNuyCt/7/ns2jbpp1+PalgE/rDQcBT0fioSMUpJ93irlUhC5hrg4cYqe6U+0ImW0rA==}
 
+  diff@9.0.0:
+    resolution: {integrity: sha512-svtcdpS8CgJyqAjEQIXdb3OjhFVVYjzGAPO8WGCmRbrml64SPw/jJD4GoE98aR7r25A0XcgrK3F02yw9R/vhQw==}
+    engines: {node: '>=0.3.1'}
+
   dts-resolver@3.0.0:
     resolution: {integrity: sha512-1T1f+z+4tl9XD+m+0HBgWoL/nm0bOIffyWaUuUSBlFg/86IWvfx+wjNaO/ybU0AJzG9/Mi5hBUgGV6zCmWEN7Q==}
     engines: {node: ^22.18.0 || >=24.0.0}
@@ -4492,6 +4500,8 @@ snapshots:
     dependencies:
       dequal: 2.0.3
 
+  diff@9.0.0: {}
+
   dts-resolver@3.0.0(oxc-resolver@11.20.0):
     optionalDependencies:
       oxc-resolver: 11.20.0

scripts/translation-pairing.manifest.json

@@ -0,0 +1,16 @@
+{
+  "required": [
+    "README.md",
+    "docs/development.md",
+    "docs/i18n/README.md",
+    "docs/i18n/translation-rules.md",
+    "docs/rfc/implemented/process/2026-07-02-bilingual-docs-and-pairing-gate.md"
+  ],
+  "excluded": [
+    "docs/AGENTS.md",
+    "docs/module-graph.md",
+    "docs/cordis-catalog/",
+    "docs/tool-catalog/",
+    "docs/i18n/terminology.md"
+  ]
+}

scripts/verify-md-links.ts

@@ -48,6 +48,7 @@ const root = resolve(import.meta.dirname, '..')
  */
 const PATTERNS = [
   'README.md',
+  'README.zh.md',
   'docs/**/*.md',
   'packages/*/*.md',
   'packages/*/*/*.md',

scripts/verify-md-wrap.ts

@@ -36,7 +36,7 @@ import type { Nodes } from 'mdast'
 const root = resolve(import.meta.dirname, '..')
 
 /** Files to check: doc-typecheck's scope plus the AGENTS.md pair. */
-const PATTERNS = ['README.md', 'docs/**/*.md', 'packages/*/*.md', 'packages/*/*/*.md', 'AGENTS.md', 'packages/AGENTS.md']
+const PATTERNS = ['README.md', 'README.zh.md', 'docs/**/*.md', 'packages/*/*.md', 'packages/*/*/*.md', 'AGENTS.md', 'packages/AGENTS.md']
 
 /** A located hard-wrap: a prose paragraph spanning more than one source line. */
 interface Violation {

scripts/verify-rfc-classification.ts

@@ -68,6 +68,9 @@ for (const lifecycle of LIFECYCLES) {
     const segs = match.split('/')
     // Allowlisted file directly at the lifecycle root (e.g. implemented/AGENTS.md).
     if (segs.length === 2 && ROOT_ALLOWLIST.has(segs[1] ?? '')) continue
+    // A Chinese counterpart (foo.zh.md, docs/i18n/README.md) is the SAME RFC,
+    // indexed via its English filename; the pairing gate owns its consistency.
+    if (match.endsWith('.zh.md')) continue
     const cls = segs[1]
     const base = segs[2]
     if (segs.length !== 3 || cls === undefined || base === undefined) {

scripts/verify-translation-pairing.ts

@@ -0,0 +1,335 @@
+/**
+ * Doc-sync gate: enforce the bilingual pairing contract (docs/i18n/README.md).
+ * English and Chinese carry EQUAL authority — either language may be authored
+ * first — so consistency is recorded per pair in a sidecar metadata file,
+ * `foo.i18n.yaml`, holding the full git blob hash of BOTH files as of the last
+ * time a human confirmed the two say the same thing:
+ *
+ *   foo.md: <40-hex blob hash>
+ *   foo.zh.md: <40-hex blob hash>
+ *
+ * The gate checks, mechanically, the checkable half of the contract:
+ *
+ *   1. Every file in the manifest's `required` list has a COMPLETE pair
+ *      (the enforcement frontier — grows batch by batch).
+ *   2. Every pair that exists at all is complete and consistent: all three
+ *      files present (a `.zh.md` or a `.i18n.yaml` without its counterparts
+ *      is an error — pairs merge whole, never half), each side's current
+ *      blob hash equals the recorded one (an edit to EITHER side without a
+ *      re-confirmed counterpart goes red), both sides carry the language
+ *      switcher, and the structural signatures match one to one — heading
+ *      depths in order, fenced code blocks VERBATIM (info string + content),
+ *      table column counts, list kinds, and every link target except the
+ *      switcher itself.
+ *   3. `excluded` files (generated docs, agent instructions, the bilingual
+ *      terminology table) have no `.zh.md` and no `.i18n.yaml` at all.
+ *
+ * What it deliberately does NOT check is translation quality or which side
+ * is "right": a green gate means the pair was confirmed consistent at these
+ * exact contents, not that the confirmation was sound — accuracy,
+ * terminology, and tone are the human reviewer's half of the contract
+ * (docs/i18n/translation-rules.md).
+ *
+ * Blob hashes, not commit hashes, so a pair edited in the same PR verifies
+ * without any history lookup: consistency is a pure content comparison,
+ * computed here directly (sha1 of `blob <size>\0<content>`) without spawning
+ * git. The recorded hash also recovers the last-confirmed text of either
+ * side (`git cat-file -p <hash>`) for diff-based minimal updates.
+ *
+ * Run: `tsx scripts/verify-translation-pairing.ts` — or with `--list` to
+ * print the pairing state of every in-scope document as a work list (always
+ * exits 0), or with `--write` to (re)record both hashes for every complete
+ * pair after you have brought the two sides back in line (the resulting
+ * yaml diff is the reviewable act of confirming consistency).
+ */
+
+import { createHash } from 'node:crypto'
+import { existsSync, readFileSync, writeFileSync } from 'node:fs'
+import { basename, join, resolve } from 'node:path'
+import { glob } from 'node:fs/promises'
+import { fromMarkdown } from 'mdast-util-from-markdown'
+import { gfmFromMarkdown } from 'mdast-util-gfm'
+import { gfm } from 'micromark-extension-gfm'
+import type { Nodes } from 'mdast'
+
+const root = resolve(import.meta.dirname, '..')
+const listMode = process.argv.includes('--list')
+const writeMode = process.argv.includes('--write')
+
+/** Scope of the bilingual contract: the root README and the docs tree. */
+const SCOPE_PATTERNS = ['README.md', 'README.zh.md', 'README.i18n.yaml', 'docs/**/*.md', 'docs/**/*.i18n.yaml']
+
+/** The enforcement frontier and the never-paired set (docs/i18n/README.md § Scope). */
+interface Manifest {
+  required: string[]
+  excluded: string[]
+}
+const manifest = JSON.parse(readFileSync(join(root, 'scripts/translation-pairing.manifest.json'), 'utf8')) as Manifest
+
+/**
+ * An excluded entry ending in `/` excludes the whole directory. The trailing
+ * slash IS the path boundary — `docs/tool-catalog/` cannot prefix-match a
+ * sibling like `docs/tool-catalog-notes/x.md` — so directory entries in the
+ * manifest must keep their trailing slash.
+ */
+function isExcluded(file: string): boolean {
+  return manifest.excluded.some(entry => (entry.endsWith('/') ? file.startsWith(entry) : file === entry))
+}
+
+/** Full git blob hash (what `git hash-object` prints). */
+function blobHash(content: Buffer): string {
+  const hash = createHash('sha1')
+  hash.update(`blob ${content.byteLength}\0`)
+  hash.update(content)
+  return hash.digest('hex')
+}
+
+/** The three paths of a pair, derived from the English-file path. */
+function pairPaths(source: string): { zh: string; meta: string } {
+  return { zh: source.replace(/\.md$/, '.zh.md'), meta: source.replace(/\.md$/, '.i18n.yaml') }
+}
+
+const META_LINE = /^([^:#]+\.md): ([0-9a-f]{40})$/
+
+/** Parse a `foo.i18n.yaml` consistency record: basename → recorded blob hash. */
+function parseMeta(content: string): Map<string, string> | undefined {
+  const out = new Map<string, string>()
+  for (const line of content.split('\n')) {
+    if (line === '' || line.startsWith('#')) continue
+    const match = META_LINE.exec(line)
+    if (!match?.[1] || !match[2]) return undefined
+    out.set(match[1], match[2])
+  }
+  return out
+}
+
+/** Render a `foo.i18n.yaml` consistency record. */
+function renderMeta(source: string, sourceHash: string, zh: string, zhHash: string): string {
+  return [
+    '# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each',
+    '# side as of the last confirmed-consistent state. Both languages carry equal authority;',
+    '# after editing either side, bring the other along and re-record with:',
+    '#   pnpm run verify-translation-pairing --write',
+    `${basename(source)}: ${sourceHash}`,
+    `${basename(zh)}: ${zhHash}`,
+    '',
+  ].join('\n')
+}
+
+/**
+ * The structural signature the two sides must share, as ordered sequences so
+ * a swap or a level change is caught, not just a count change. Prose is
+ * deliberately absent: the gate checks shape, never wording.
+ */
+interface Signature {
+  /** Heading depths in document order (h2 → 2). */
+  headings: number[]
+  /** Fenced code blocks verbatim: info string + content, in order. */
+  code: string[]
+  /** Column count of each table, in order. */
+  tables: number[]
+  /** Each list's kind (ordered vs bullet), in order. */
+  lists: string[]
+  /** Every link target in order, the language switcher's excluded. */
+  links: string[]
+}
+
+/** Whether the tree contains a link to exactly `target` (the switcher check). */
+function linksTo(tree: Nodes, target: string): boolean {
+  let found = false
+  const visit = (node: Nodes): void => {
+    if (node.type === 'link' && node.url === target) found = true
+    if ('children' in node) for (const child of node.children) visit(child)
+  }
+  visit(tree)
+  return found
+}
+
+/** Collect the structural signature, skipping links to `switcherTarget`. */
+function signatureOf(tree: Nodes, switcherTarget: string): Signature {
+  const sig: Signature = { headings: [], code: [], tables: [], lists: [], links: [] }
+  const visit = (node: Nodes): void => {
+    switch (node.type) {
+      case 'heading':
+        sig.headings.push(node.depth)
+        break
+      case 'code':
+        sig.code.push(`\`\`\`${node.lang ?? ''}${node.meta ? ` ${node.meta}` : ''}\n${node.value}`)
+        break
+      case 'table':
+        sig.tables.push(node.children[0]?.children.length ?? 0)
+        break
+      case 'list':
+        sig.lists.push(node.ordered ? 'ordered' : 'bullet')
+        break
+      case 'link':
+        if (node.url !== switcherTarget) sig.links.push(node.url)
+        break
+      default:
+        // Every other node kind is prose or container — not part of the signature.
+        break
+    }
+    if ('children' in node) for (const child of node.children) visit(child)
+  }
+  visit(tree)
+  return sig
+}
+
+/** Render a signature element for an error message, truncated for readability. */
+function show(value: string | number | undefined): string {
+  if (value === undefined) return 'nothing'
+  const text = JSON.stringify(value)
+  return text.length > 72 ? `${text.slice(0, 72)}…` : text
+}
+
+/** First divergence between two signatures, as messages; empty when identical. */
+function signatureDiff(source: Signature, zh: Signature): string[] {
+  const out: string[] = []
+  const fields: [string, (string | number)[], (string | number)[]][] = [
+    ['heading (depth)', source.headings, zh.headings],
+    ['code block', source.code, zh.code],
+    ['table (column count)', source.tables, zh.tables],
+    ['list (kind)', source.lists, zh.lists],
+    ['link target', source.links, zh.links],
+  ]
+  for (const [field, s, z] of fields) {
+    const length = Math.max(s.length, z.length)
+    for (let i = 0; i < length; i++) {
+      if (s[i] !== z[i]) {
+        out.push(`${field} #${i + 1} diverges between the pair: ${show(s[i])} vs ${show(z[i])}`)
+        break
+      }
+    }
+  }
+  return out
+}
+
+function parse(content: string): Nodes {
+  return fromMarkdown(content, { extensions: [gfm()], mdastExtensions: [gfmFromMarkdown()] })
+}
+
+// Enumerate the scope once.
+const files = new Set<string>()
+for (const pattern of SCOPE_PATTERNS) {
+  for await (const match of glob(pattern, { cwd: root })) files.add(match)
+}
+const translations = [...files].filter(f => f.endsWith('.zh.md')).sort()
+const metas = [...files].filter(f => f.endsWith('.i18n.yaml')).sort()
+const sources = [...files].filter(f => f.endsWith('.md') && !f.endsWith('.zh.md')).sort()
+
+// --write: (re)record both hashes for every complete pair, creating missing records.
+if (writeMode) {
+  let written = 0
+  for (const source of sources) {
+    if (isExcluded(source)) continue
+    const { zh, meta } = pairPaths(source)
+    if (!existsSync(join(root, zh))) continue
+    const record = renderMeta(source, blobHash(readFileSync(join(root, source))), zh, blobHash(readFileSync(join(root, zh))))
+    if (existsSync(join(root, meta)) && readFileSync(join(root, meta), 'utf8') === record) continue
+    writeFileSync(join(root, meta), record)
+    console.log(`verify-translation-pairing: recorded ${meta}`)
+    written++
+  }
+  console.log(`verify-translation-pairing: ${written} record(s) written; run the check to validate the pairs.`)
+  process.exit(0)
+}
+
+const errors: string[] = []
+const state = new Map<string, 'ok' | 'out-of-sync' | 'missing'>()
+
+// 1. Required pairs exist.
+for (const req of manifest.required) {
+  if (!existsSync(join(root, req))) {
+    errors.push(`${req}: listed in translation-pairing.manifest.json \`required\` but the file does not exist`)
+    continue
+  }
+  const { zh } = pairPaths(req)
+  if (!existsSync(join(root, zh))) {
+    errors.push(`${req}: required to have a translation, but ${zh} does not exist`)
+    state.set(req, 'missing')
+  }
+}
+
+// 2. Every pair that exists at all is complete and consistent. Anchor on the
+// union of .zh.md files and .i18n.yaml records so a half-deleted pair is
+// caught from either remnant.
+const pairAnchors = new Set<string>()
+for (const zh of translations) pairAnchors.add(zh.replace(/\.zh\.md$/, '.md'))
+for (const meta of metas) pairAnchors.add(meta.replace(/\.i18n\.yaml$/, '.md'))
+
+for (const source of [...pairAnchors].sort()) {
+  const { zh, meta } = pairPaths(source)
+  const have = { source: existsSync(join(root, source)), zh: existsSync(join(root, zh)), meta: existsSync(join(root, meta)) }
+
+  if (isExcluded(source)) {
+    if (have.zh) errors.push(`${zh}: ${source} is excluded from pairing (generated or bilingual-by-construction); this translation must not exist`)
+    if (have.meta) errors.push(`${meta}: ${source} is excluded from pairing; this consistency record must not exist`)
+    continue
+  }
+  const missing = Object.entries(have).filter(([, ok]) => !ok).map(([k]) => (k === 'source' ? source : k === 'zh' ? zh : meta))
+  if (missing.length > 0) {
+    errors.push(`${source}: incomplete pair — missing ${missing.join(', ')} (pairs merge whole: both languages plus the .i18n.yaml record)`)
+    continue
+  }
+
+  const sourceContent = readFileSync(join(root, source))
+  const zhContent = readFileSync(join(root, zh))
+  const record = parseMeta(readFileSync(join(root, meta), 'utf8'))
+  if (!record || record.size !== 2 || !record.has(basename(source)) || !record.has(basename(zh))) {
+    errors.push(`${meta}: malformed consistency record (expected exactly \`${basename(source)}: <40-hex>\` and \`${basename(zh)}: <40-hex>\`)`)
+    continue
+  }
+
+  let consistent = true
+  for (const [file, content] of [[source, sourceContent], [zh, zhContent]] as const) {
+    const current = blobHash(content)
+    if (record.get(basename(file)) !== current) {
+      errors.push(`${file}: out of sync — content no longer matches the pair's last confirmed-consistent state in ${meta} (bring the other side along, then re-record with --write)`)
+      consistent = false
+    }
+  }
+  if (!consistent) {
+    state.set(source, 'out-of-sync')
+    continue
+  }
+
+  const sourceTree = parse(sourceContent.toString('utf8'))
+  const zhTree = parse(zhContent.toString('utf8'))
+  if (!linksTo(zhTree, basename(source))) {
+    errors.push(`${zh}: missing language switcher — no link to ${basename(source)}`)
+  }
+  if (!linksTo(sourceTree, basename(zh))) {
+    errors.push(`${source}: missing language switcher — no link back to ${basename(zh)}`)
+  }
+  for (const divergence of signatureDiff(signatureOf(sourceTree, basename(zh)), signatureOf(zhTree, basename(source)))) {
+    errors.push(`${source} ↔ ${zh}: ${divergence}`)
+  }
+  if (!state.has(source)) state.set(source, 'ok')
+}
+
+// Complete the state map for --list: any in-scope, non-excluded document with no pair yet is backlog.
+for (const source of sources) {
+  if (!isExcluded(source) && !state.has(source)) state.set(source, 'missing')
+}
+
+if (listMode) {
+  const order = { 'out-of-sync': 0, missing: 1, ok: 2 } as const
+  const rows = [...state.entries()].sort((a, b) => order[a[1]] - order[b[1]] || a[0].localeCompare(b[0]))
+  for (const [file, status] of rows) {
+    const required = manifest.required.includes(file)
+    console.log(`${status.padEnd(11)} ${file}${status === 'missing' ? (required ? '  (required)' : '  (backlog)') : ''}`)
+  }
+  const counts = { 'ok': 0, 'out-of-sync': 0, 'missing': 0 }
+  for (const status of state.values()) counts[status]++
+  console.log(`verify-translation-pairing: ${counts.ok} ok, ${counts['out-of-sync']} out-of-sync, ${counts.missing} missing (of ${state.size} in scope)`)
+  process.exit(0)
+}
+
+if (errors.length === 0) {
+  console.log(`verify-translation-pairing: ${pairAnchors.size} pair(s) checked against ${manifest.required.length} required, all consistent.`)
+  process.exit(0)
+}
+
+console.error('verify-translation-pairing: bilingual pairing contract violated (see docs/i18n/README.md):')
+for (const message of errors) console.error(`  ${message}`)
+process.exit(1)