Files
deepseek-harness/packages/ui/stdio-agent
kingwl 88db403d9f Merge branch 'worktree-session-modes-rfc' (master: sandbox stack #169, skills #109, prompt snapshots #254)
The stack rebases onto a moved master through its base branch. Beyond
mechanical unions (both branches' demo scripts, example rows, service
roles, tool lists, acp deps, doc budgets — each side fit alone, the
union needs the higher ceilings), three semantic reconciliations:

- The ACP bridge now carries BOTH per-session surfaces: the sandbox
  stack's config options + approval answerer and this branch's session
  modes; session/new and session/load advertise modes AND configOptions
  side by side.
- The feature matrix supersedes the sandbox stance per the RFC's
  second-lander rule: session/set_mode and current_mode_update flip to
  shipped-by-dsh-mode, config-option rows stay as #169 wrote them, and
  §6 records both landed features under the picker-to-modes /
  knobs-to-config-options division.
- The snapshot pin grammar (#254: one header snapshot + declared deltas
  + a Markdown prompt golden) gains a symmetric declaration for what a
  delta cannot express: expectedHeaderSnapshots — a plan-mode flip
  resorts the canonical tool list, so its widening lands as a second
  full snapshot, now its own Markdown section. The pin-less-class and
  model-turn-only-pin amendments carry over; new fixtures cover the
  extended writer paths, and the plan-acp-agent scenarios re-recorded
  under the merged composition (the app now bundles the skill tool)
  with the suite's refresh mode wired through.
2026-07-12 20:08:09 +08:00
..

@deepseek-ai/dsh-stdio-agent

The terminal stdio chat app: a Cordis app plugin that composes the default agent spine (@deepseek-ai/dsh-agent-core) with the front-door cluster a terminal chat needs, and a bin that boots a leaf cordis.yml.

It is the readline counterpart to @deepseek-ai/dsh-acp-agent: both consume the same spine, but each bakes in the OPPOSITE front-door cluster.

What it bakes in

A terminal chat always wants the same cluster, so the package owns it rather than trusting each leaf to re-wire it:

Plugin Why it is here
@cordisjs/plugin-logger-console the console logger — stdout is just the terminal here, so logging to it is correct (the ACP app must NOT have this)
@deepseek-ai/dsh-agent-core the spine, pre-creating a main agent from this app's model with process.cwd() as the fresh session cwd and carrying its persona
@deepseek-ai/dsh-session-persistence-jsonl durable JSONL session log under persistenceRoot
@deepseek-ai/dsh-user-interaction the human question/answer seam used by confirmation tools
@deepseek-ai/dsh-tool-ask-user the model-facing ask_user_question tool
stdio-chat (in-package module) the readline UI, bound to the main agent

@cordisjs/plugin-hmr (the dev/demo edit-reload loop) is deliberately a leaf entry, NOT baked in here: it is a Loader-only, subprocess-only dev plugin — its constructor throws without node --expose-internals + a live loader, and the in-process test tier cannot even import it (so a package whose apply statically pulled it in could never carry the per-file coverage gate). Unlike the console logger, a stray hmr is not a stdout-purity footgun, so leaving it at the leaf costs no safety. The demo:echo / demo:repl leaves load it and pass --expose-internals.

The leaf cordis.yml supplies only the swappable backends — an LLM adapter (llm-deepseek for the real model, or the mock mock-llm for a demo) and a bash executor (bash-local) — hmr, plus this app's Config. The whole plugin tree a run loads is therefore: this app's cluster, the spine inside agent-core, hmr, and the two leaf backends.

Config

Key Default Routed to
model (required) the pre-created main agent's model
persona the deployment persona template (may reference {{model}}), routed to dsh-system-prompt
toolOrder explicit model-facing tool order (a name list with one '<unlisted-tools>' rest entry; absent — lexicographic; an unregistered name fails each turn at prompt assembly), routed to dsh-system-prompt
persistenceRoot ./.sessions the JSONL backend's root directory
welcome ready. the stdin-chat banner
resumeSessionId resume a persisted session id instead of starting fresh (sourced from an env var in the leaf)

Fresh stdio sessions use the process launch directory as session.header.cwd, so project-scoped features such as skill discovery and default bash workdir follow the directory where dsh-stdio-agent was started. Resumed sessions keep the cwd stored in the persisted session header.

The bin

dsh-stdio-agent [path-to-cordis.yml] (default ./cordis.yml) loads a gitignored .env from the cwd (DEEPSEEK_API_KEY / DEEPSEEK_BASE_URL), then drives the cordis Loader against the config and awaits the whole plugin tree before returning. Run it under node --expose-internals: the cordis Loader resolves the config's bare plugin specifiers (@deepseek-ai/dsh-*, npm packages) through its internal module loader, which is only active under that flag. The demo:echo / demo:repl scripts invoke it that way.

Example leaf cordis.yml

# A REPL agent demo: hmr + the DeepSeek adapter + local bash, then this app.
- id: hmr
  name: '@cordisjs/plugin-hmr'
  config:
    root: ['.']
- id: llm-deepseek
  name: '@deepseek-ai/dsh-llm-deepseek'
  config:
    apiKey: !!js process.env.DEEPSEEK_API_KEY
    models: [deepseek-v4-flash]
- id: bash
  name: '@deepseek-ai/dsh-bash-local'
  config:
    timeoutMs: 60000
- id: stdio-agent
  name: '@deepseek-ai/dsh-stdio-agent'
  config:
    model: deepseek-v4-flash
    persona: 'You are a coding assistant powered by the {{model}} model.'

Swap llm-deepseek for a mock-llm leaf plugin and you have the echo demo — "swap the backend, keep the app".