fix: deduplicate delivered skill context and gate input-only roles - #607
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Included review availability: Your plan provides up to 8 included reviews per hour; 4 remain after this review. WalkthroughThe change adds ACP prompt-section tracking and compaction. Skill catalogs now use this mechanism, refresh after changes, and avoid duplicate startup content. Input-only harness roles omit situation and skills context. ChangesPrompt section delivery
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant HarnessContextResolver
participant skillsCatalogAugmenter
participant SessionManager
participant ACPClient
participant AgentProcess
HarnessContextResolver->>skillsCatalogAugmenter: resolve skills augmenter
skillsCatalogAugmenter->>SessionManager: register catalog PromptSection
SessionManager->>ACPClient: submit PromptRequest with Sections
ACPClient->>AgentProcess: compact delivered catalog content
AgentProcess-->>ACPClient: return prompt response
ACPClient->>AgentProcess: mark catalog section delivered
Merge Risk: ⚪ Minimal · up to This increment only adds a test that measures delivered skill catalogs during harness context integration; no production behavior changes are included in this slice, so there is no material merge risk to flag here. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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| Filename | Overview |
|---|---|
| internal/acp/prompt_sections.go | Introduces process-scoped section compaction and delivery acknowledgment without mutating retryable prompt input. |
| internal/acp/client_prompt.go | Applies compaction at the wire boundary and records delivery only after successful, uncanceled responses. |
| internal/session/manager_prompt_submit.go | Collects prompt-section metadata during augmentation and carries it into ACP dispatch requests. |
| internal/daemon/prompt_skills.go | Replaces preparation-time session caching with full catalog registration for transport-controlled compaction. |
| internal/daemon/harness_context_policy.go | Gates skill and situation startup/live context for the three input-only roles. |
| internal/daemon/harness_context_integration_test.go | Verifies delivered catalogs and role-specific context through the production assembler and ACP fixture. |
| packages/site/vercel.json | Pins preview dependency installation to Bun 1.4.0 with frozen-lockfile enforcement. |
Sequence Diagram
sequenceDiagram
participant D as Daemon augmenter
participant M as Session manager
participant A as ACP process
participant P as Provider
D->>D: Resolve current filtered skill catalog
D->>M: Full prompt plus section metadata
M->>A: Dispatch retryable full input
A->>A: Compare startup or acknowledged catalog
alt Startup contains equivalent catalog
A->>P: Startup catalog plus unchanged marker
else Catalog previously acknowledged
A->>P: Unchanged marker
else New, changed, or uncertain catalog
A->>P: Full current catalog
end
alt Successful and uncanceled response
P-->>A: Completed response
A->>A: Record catalog signature
else Error or cancellation
P-->>A: Failure or cancellation
A->>A: Invalidate uncertain section state
end
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Inline comments:
In `@internal/daemon/harness_context_integration_test.go`:
- Around line 804-814: Update the assertions around the first and changed
payloads to collect every encoded skill name and compare each payload against
the exact expected catalog sets: all 23 seeded skills for first, and those 23
skills plus measured-added for changed. Keep the unchanged-payload assertion
verifying that no skill entries are present, and ensure the comparisons detect
omitted or replaced catalog entries.
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⛔ Files ignored due to path filters (3)
docs/qa/reports/2026-09-10-skills-prompt-dedup.mdis excluded by!**/*.mddocs/qa/scenarios/ET-049.mdis excluded by!**/*.mdpackages/site/content/docs/skills/bundled.mdxis excluded by!**/*.mdx
📒 Files selected for processing (14)
internal/acp/agent_process.gointernal/acp/client_prompt.gointernal/acp/client_prompt_contract_test.gointernal/acp/prompt_sections.gointernal/acp/types.gointernal/daemon/daemon_extension_agent_fixture_e2e_integration_test.gointernal/daemon/harness_context.gointernal/daemon/harness_context_integration_test.gointernal/daemon/harness_context_policy.gointernal/daemon/harness_context_test.gointernal/daemon/prompt_skills.gointernal/daemon/prompt_skills_test.gointernal/session/manager_prompt_recovery.gointernal/session/manager_prompt_submit.go
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Disposition for the Docstring Coverage warning in the review summary: no code change is needed. All newly introduced exported identifiers in |
What & why
Closes #604.
An ordinary session's first request repeated its entire skill catalog in both startup and live context. The augmenter tracked only its own previous rendered output, so startup delivery never established a comparison point. It also recorded catalogs during preparation, before the provider confirmed receiving them. Separately, input-only daemon roles excluded tool guidance but still received situation context and skill catalogs they could not use.
This change moves catalog compaction to the ACP delivery boundary. Preparation retains the full filtered current catalog plus its equivalent startup rendering. The wire request uses the existing unchanged marker only when that equivalent startup is being delivered or the same ACP process has acknowledged that catalog. Successful, uncanceled responses establish the record; failures and cancellation invalidate uncertain context. Recovery retains full input and a new process starts with no acknowledged sections. The old session-wide catalog LRU is removed.
The existing input-only role predicate now excludes startup and live skills and situation context for memory extraction, automatic titles, and checkpoint summaries. Ordinary sessions retain useful context. Runtime identity, authored instructions, current filtering, and explicit skill invocation retain their existing paths.
Measured receiver payloads
The same production harness/session-manager fixture ran against the base daemon files through a Go overlay and against the fix. Diagnostics come from an actual ACP fixture subprocess, with 23 seeded skills plus the bundled skill. Input-only fixtures use common instructions and input to isolate harness overhead.
The first-turn reduction is 2,804 measured bytes; input-only reductions are 9,647–9,740 bytes. The one-byte unchanged-turn difference is generated metadata variation. These are measured UTF-8 payloads, not token, billing, or production transcript projections. The baseline scenario reproduces first-turn duplication and all three role failures; the corrected scenario passes.
How you verified it
Final delivery gates run in GitHub CI on the current PR head. The earlier local evidence below remains valid for unchanged code.
go test -race -tags=integration ./internal/daemon -run '^TestHarnessContextIntegrationScopesToolGuidanceForInternalCallers$' -count=1: passed, including persisted-role resume with skills enabled and disabled.go test -race -tags=integration ./internal/daemon -run '^TestHarnessContextIntegrationMeasuresDeliveredSkillCatalogs$' -count=1: passed; produces the receiver measurements above.go test -race -tags=integration ./internal/daemon -run '^TestDaemonE2EExtensionPublishedAgentSessionCommandsAndPrompt$' -count=1: passed through the real daemon, HTTP, hosted MCP, and ACP fixture subprocess, including explicit skill invocation.make gate: passed with zero lint issues; all affected ACP, daemon, session, and input-queue race suites passed. The consolidated review-remediation commit passed locally before delivery gates moved to GitHub CI. The subsequent preview-install correction is validated remotely.91995c030: compare complete receiver skill lists for first, unchanged, and changed turns. The strengthened integration scenario andmake gatepassed.Runtime tests used isolated temporary homes and owned process cleanup. No host-daemon restart, live inference-provider billing/model behavior, or Windows validation is claimed. Authored and verified by Codex (GPT-6 Astra).
Reproducible preview installation
Vercel's default Bun 1.3.14 installer cannot read this repository's version-2 lockfile. It ignored
the lockfile and resolved newer Fumadocs/Zod packages, causing type errors even though the locked
GitHub frontend build passed.
packages/site/vercel.jsonnow usesbunx [email protected] install --frozen-lockfile, matching the existing rootpackageManagerandVercel's documented version-pinning method.
This makes the preview use the committed dependency graph and fail explicitly on lockfile drift.
No dependency versions, shared project settings, or application type checks are changed.
Validation for this CI correction runs in the remote preview and current-head GitHub CI.
The complete first CodeRabbit review is addressed in one remediation commit, and Greptile
reported no actionable findings. No repeat review round is required.
Impact
No public CLI/HTTP/UDS/native-tool schema, permission, runtime configuration, extension, or persisted-data shape changes. Compaction metadata stays internal and never enters provider-visible structured metadata. Context hashes belong to one ACP process, preserving workspace/profile/process isolation and fresh recovery semantics. No migration or user action is required.
The bundled-skills guide and ET-049 document the behavior. The official skill's existing unchanged-marker/latest-full-catalog guidance remains valid. The full cross-surface audit and measurement methodology are in
docs/qa/reports/2026-09-10-skills-prompt-dedup.md. No rendered UI changes.make gatepasses locally; this PR is delivered only after its required CI checks are green