PR Review Summary

Status: Approved

🪜 Strategic-Fit Decision

• Decision: Approve
• Rationale: Single-file substrate change matches #10624's acceptance shape exactly — explicit allow-list (validAppNames = ['Antigravity', 'Claude']), throw on non-canonical input, positive + negative spec coverage, helpful error message identifying allowed values. Out-of-scope item (stale-row cleanup of WAKE_SUB:b9211b22-...) correctly deferred to operator post-merge per the ticket's Out-of-Scope framing. No bundling.

Peer-Review Opening: Thanks for picking this up — clean focused implementation. The error message format ("Invalid appName 'antigravity'. Must be one of: Antigravity, Claude") is exactly right for the discoverability concern raised in the ticket's Avoided Traps.

🕸️ Context & Graph Linking

• Target: Resolves #10624
• Related: Substrate-stack #5 lane; unblocks #10625 (all-agent-idle detection) on canonical-routes axis once merged

🔬 Depth Floor

Challenge: I want to verify the validator fires on BOTH subscribe and update paths, not just subscribe. From the diff context the throw is added inside what looks like a single validator method, but the spec only exercises subscribe. If update allows mutating an existing subscription's appName to a non-canonical value, the canonicalization invariant has a backdoor. Optional polish before merge: spec-level test that asserts update with non-canonical appName also throws (or document explicitly that update doesn't accept appName, if that's the design). Non-blocking — the substrate fix is correct, this is hardening on the edge case.

Rhetorical-Drift Audit: PR body claims match diff exactly. Test evidence claim ("All unit tests passing") verifiable; CodeQL still in progress at review time.

🧠 Graph Ingestion Notes

• [RETROSPECTIVE]: Substrate-truth pattern parity continued — same family as #10619 / #10623 / #10620 (where the substrate silently accepted wrong-form input). Throw-at-write-boundary is the right shape for this category; folds cleanly into the "verify-effect not just success" discipline. The Antigravity/antigravity duplicate-route row that triggered this (#10624 Context section) is the empirical anchor.

🛂 Provenance Audit

N/A — bug fix scoped to existing service.

🎯 Close-Target Audit

• Resolves #10624 — confirmed not epic-labeled (substrate-stack sub-issue under #10601). Pass.

📡 MCP-Tool-Description Budget Audit

N/A — no OpenAPI changes.

🔌 Wire-Format Compatibility Audit

• Wire-format unchanged for accepted (canonical) inputs; non-canonical inputs that previously silently persisted now throw. Behavioral break for any existing caller passing non-canonical appName. The duplicate WAKE_SUB:b9211b22-... is the only known instance and is explicitly tracked for operator-driven post-merge cleanup. Pass with the noted operator follow-up.

🔗 Cross-Skill Integration Audit

• No skill files touched
• No new MCP tools introduced (validator is internal to existing tool)

🧪 Test-Execution Audit

• Spec exercises both directions (canonical accepted, non-canonical rejected)
• Bootstrap test fixture aligned (TestApp → Antigravity)
• Update path coverage — see Depth-Floor challenge above (optional polish)

📋 Required Actions

No required actions — eligible for human merge.

📊 Evaluation Metrics

• [ARCH_ALIGNMENT]: 95 — substrate-truth-at-write-boundary aligned with #10619 / #10623 family
• [CONTENT_COMPLETENESS]: 90 — covers ticket AC; update-path coverage gap noted as polish
• [EXECUTION_QUALITY]: 95 — clean focused diff, clear error message, correct test fixture realignment
• [PRODUCTIVITY]: 95 — small surgical fix unblocks substrate-stack #1 (#10625) on canonical-routes axis
• [IMPACT]: 85 — directly addresses operator-observed duplicate-wake bug; substrate prerequisite for trio liveness
• [COMPLEXITY]: 25 — 1-file substrate change with focused tests
• [EFFORT_PROFILE]: Quick Win — substrate-truth fix at write boundary

Cycle-1 approval. The update-path coverage is genuinely polish, not a blocker. Eligible for @tobiu's merge gate per §0 Critical Gate 1.