FE-867: Agent extension host — dual-mode (elicit/execute) pi-harness contract#213
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Define the dual-mode (elicit/execute) agent-extension-host contract as transport-safe metadata only — src/agent-extension-host.ts: AgentExtensionMode, capability/plugin/consumer-witness contracts, flattenCapabilityIds. The module is dependency-free and names no execute-only concept, so it stays neutral across both consumers (cook via the pi SDK, interview via the Vercel AI SDK) and any future runtime. Prove the two-consumer bar without migrating any runtime: cook's execute surface matches createPiActions() action ids exactly; the interview's elicit surface is witnessed against the real createExplorationTools() family plus a type-enforced coverage check over keyof InterviewerTools (gated by lint --type-check). Contract-first, zero behavior change. Defers the runtime host/dispatch and a pi adapter until a real driver lands (coordinated with the pi-harness thread that owns the core implementation). Amp-Thread-ID: https://ampcode.com/threads/T-019ecb9a-9a08-733b-833d-76885fc8243a Co-authored-by: Amp <amp@ampcode.com>
Lean on no-imports as the load-bearing neutrality guarantee and drop the redundant forbidden-substring denylist (a dependency-free module cannot reference an execute-only or SDK type, so neutrality is structural, not a name list to maintain). Make the interview exploration plugin proof bidirectional — its capability ids must exactly equal Object.keys(createExplorationTools(...)), catching phantom as well as missing tools. Document that the three native interviewer tools are covered type-level only (superset) because constructing them needs a live DB. Review findings #1 and #2 from ln-review. Zero behavior change. Amp-Thread-ID: https://ampcode.com/threads/T-019ecb9a-9a08-733b-833d-76885fc8243a Co-authored-by: Amp <amp@ampcode.com>
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Stacks on FE-864. First Arc-1 frontier and the base of the cook stack — every Arc-1 frontier lands on this contract.
What?
The dual-mode (
elicit/execute) agent-extension-host contract —src/agent-extension-host.ts, transport-safe metadata only:AgentExtensionMode, the capability/plugin/consumer-witness types, andflattenCapabilityIds.Dependency-free and names no
execute-only concept (slice/epic/plan/worktree/toolchain) — neutrality is a checkable invariant. Two-consumer proof, no runtime migration:executesurface matchescreatePiActions()ids exactlyelicitsurface is witnessed againstcreateExplorationTools()+ akeyof InterviewerToolscoverage checkWhy?
The pi harness is reused for spec elicitation and cook execution; one dual-mode host (not two) keeps dispatch, confinement, and tool-scoping shared. This file is the serialization point with the unpublished pi-harness thread that owns the core runtime — targeting the contract, not
pi, keeps the dispatch-seam frontiers decoupled from that rewrite.Deferred
Runtime host/dispatch + a
piadapter wait until a real driver lands. Contract-first, zero behavior change.Co-authored-by: Amp amp@ampcode.com
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