The four near-twin helpers the two published bins carried — loadEnv, installFailLoud, assertEntriesLoaded, boot — live once in packages/ui/app-boot, parameterized by the bin's diagnostic prefix and injectable at their side-effect seams (warn sink, process slice), so every branch sits under the per-file 100% coverage gate: the unit suite drives boot() in-process against the real Loader (relative-specifier configs) through both the settled-tree path and the fiber-less-entry rejection, and exercises the ENOENT/unloadable .env split, the Error/non-Error/stackless fail-loud arms, and the disabled-entry exclusion. resolveConfigPath (snapshot-aware) becomes the single path resolver for both bins. Each bin.ts is now a thin self-executing composition plus its app-specific lifecycle (acp: replay env-skip + stdin-EOF dispose; stdio: nothing extra), exports nothing, and stays coverage-excluded; the built-bin smokes still prove both artifacts under plain node in the node_modules-shaped temp dir (now symlinking ui/app-boot), including the missing-config non-zero exit. Implements docs/rfc/implemented/simplification/2026-07-04-share-app-bin-boot-glue.md (moved from proposed/ and amended); the extract-example-app-packages RFC's bin-ownership facts are amended in the same change.
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ui/ — editor/client integration surfaces
Integrations that expose the agent to an external editor or client. These are product packages: a real surface a user drives the harness through.
| Package | Role | ctx key |
|---|---|---|
acp/ |
Agent Client Protocol bridge: serves the agent to an ACP editor (Zed) over JSON-RPC stdio | (drives ctx.agents/ctx.sessions) |
stdio-agent/ |
Terminal stdio chat APP: the agent-core spine + console logger + readline UI + a pre-created main agent, with a bin |
(composition + bin) |
acp-agent/ |
ACP server APP: the agent-core spine + JSONL persistence + the acp bridge (no stdout logger), with a bin |
(composition + bin) |
app-boot/ |
Shared boot glue for the two app bins: .env loading, fail-loud Loader guards, snapshot-aware config resolution, the settle-the-tree boot sequence |
(library for the bins) |
A UI integration is a client-driver plugin, not a loop change and not a capability seam: it consumes the existing agent/* event taxonomy and the dsh-agent factory. The readline UI is the unstructured analogue of the acp bridge and lives INSIDE the stdio app (the stdio-chat module of stdio-agent/): it is scaffolding for that one front door, not an independently swappable integration, so it carries no package boundary of its own.
stdio-agent and acp-agent are the two app packages: each composes the core/agent-core spine with its coupled front-door cluster (and owns the boot bin), so a leaf cordis.yml is the swappable backends plus one app entry plus any optional product tools. They live in ui/ because each IS a user-facing front door; the stdout-purity coupling (logger vs. no logger) becomes a property of the artifact rather than a leaf convention.