Merge remote-tracking branch 'origin/codex/package-readme-limitations-audit-20260712' into codex/model-experience-readmes-20260712
# Conflicts: # docs/cookbook/adding-a-package.md # docs/rfc/INDEX.md # package.json # packages/AGENTS.md # packages/bash/bash-sandbox/README.md # packages/sandbox/sandbox-local/README.md # packages/sandbox/sandbox/README.md # packages/session-persistence/session-persistence-sqlite/README.md # packages/support/acp-snapshot/README.md # packages/ui/app-boot/README.md # packages/ui/user-approval/README.md # packages/workflow/tool-workflow/README.md
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@@ -42,8 +42,9 @@ Beside `capabilities` sits one DESCRIPTIVE fact, not validated by the service: `
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The service also announces provider lifecycle: `subagent/provider-added` (the frozen registry snapshot) fires after a registration and `subagent/provider-removed` (the accepted name) after an unregistration, so a consumer deriving state from a named provider (the model-facing tool wording) mirrors registry membership instead of assuming load order — the cordis Loader starts sibling plugins concurrently, so "listed earlier" does not mean "registered earlier". Run lifecycle is gated by provider readiness: `subagent/start` (payload `SubagentRunInfo`) fires only after `run.started` fulfills, and `subagent/end` (payload `SubagentRunEndInfo`) fires only for that announced run; readiness rejection emits neither. For spawn/fork, the start listener can resolve the published child via `ctx.agents.get(info.id)`; a remote provider need not have a local registry entry. Both events are **observe-only** plain emits. The service observes `result` immediately even while readiness is pending, clones its output before the caller can mutate it, and buffers that end payload until start has fired; a rejecting result cannot become an unhandled detached promise, start always precedes end, and a listener cannot corrupt the caller's result. `subagent/end` carries the cloned output as `lastAssistantMessage` on the settle path and omits it on infrastructure rejection. Any run-affecting decision is out of scope for this observe-only surface.
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## Scope (first cut)
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## Known Limitations and Deferred Work
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The consumer collects **synchronously**: it starts a run and awaits `result`. Steering (`sendMessage`) is part of the contract but intentionally unused. Background / poll / spill semantics are deferred to a future redesign unifying long-running-tool handling across subagents and bash. See the RFC: [docs/rfc/implemented/feature/2026-06-21-subagent-capability-seam.md](../../../docs/rfc/implemented/feature/2026-06-21-subagent-capability-seam.md).
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- **The consumer collects synchronously** — it starts a run and awaits `result`; steering (`sendMessage`) is part of the contract but intentionally unused, and background / poll / spill semantics are deferred to a future redesign unifying long-running-tool handling across subagents and bash ([the seam RFC](../../../docs/rfc/implemented/feature/2026-06-21-subagent-capability-seam.md)).
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- **The lifecycle events are observe-only** — a run-affecting `subagent/end` (an awaited continuation/decision surface) is deferred until a consumer needs one (`FIXME(subagent-continuation)`).
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See `src/types.ts` for the full contracts.
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