PR Review Summary

Status: Approved

🪜 Strategic-Fit Decision

Per §9 Strategic-Fit Step-Back:

• Decision: Approve
• Rationale: Free of blocking defects. Clean, well-tested log-disk hygiene; the implementation matches #13474's Contract Ledger exactly (no drift), it's cloud-beneficial (bounds growth on the cloud MC/KB/NL), and the failure path is non-throwing (a prune failure can never crash an MCP server boot). The two Depth-Floor items are minor, handled, non-blocking.

Peer-Review Opening: Clean one, Euclid. The pure-function decomposition (resolveLoggerRetention / selectPrunableLogFiles / pruneLoggerRetention) makes the policy trivially testable, the active-file-always-preserved invariant is enforced at the listing layer (not just hoped for), and the Contract Ledger matches the shipped reality (nice contrast to the #13489 drift). Approving.

🧭 Patch-Blind Premise Snapshot

• Inputs Read Before Patch: #13474 (body + Contract Ledger + ACs), the existing ai/mcp/server/shared/logger.mjs (createLogger rotation), the three MCP server config templates (KB/MC/NL), and the private deployment live-deploy compose (the MCP servers run there → cloud-relevance).
• Expected Solution Shape: Config-driven per-server retention (env-backed leaves), pruning old matching files while never touching the active file or other servers' logs, with a non-throwing failure path (logging must not crash an MCP boot — esp. the cloud MC/KB). Fully unit-testable (no L3/L4).
• Patch Verdict: Matches. Active-file preservation is enforced in listHistoricalLogFiles (excludes today); prefix-scoping isolates per-server pruning; pruneLoggerRetention is try/catch→warnRetentionFailure (non-throwing); invalid config degrades to disabled-dimension via normalizeRetentionNumber. Ledger ↔ impl in sync.

🕸️ Context & Graph Linking

• Target Issue ID: Resolves #13474
• Related Graph Nodes: sibling stability stream (#13489 / #13490).

🔬 Depth Floor

Challenge (non-blocking edge cases):

1. Concurrent same-prefix instances sharing logPath (the multi-clone / multi-instance scenario that's real in this codebase) would race the prune — two servers select the same stale files and both unlinkSync. The second hits ENOENT, which is caught by the pruneLoggerRetention try/catch → bounded warn (non-fatal). So it's handled, but there's no explicit concurrency test — the failure-warning test covers the mechanism generically. Worth a one-line note that double-prune is intentionally benign.
2. Retention is rotation-triggered, not timer-based — the prune runs inside createLogger's day-roll/stream-creation path, so enforcement happens at day-roll or boot (≤1 roll lag), not continuously. Fine for log hygiene; just not a continuous-timer guarantee. A long-lived server prunes on each day-roll; a frequently-restarted one prunes each boot.

Rhetorical-Drift Audit (§7.4): Pass. JSDoc accurately scopes the policy ("applies only to files matching the prefix", "active current-day file is always preserved", "Logging must never make the MCP server fail to boot"); no overshoot.

🧠 Graph Ingestion Notes

• [RETROSPECTIVE]: The active-file-preservation invariant being enforced at the listing layer (listHistoricalLogFiles excludes today) rather than the prune layer is the right shape — it makes "a retention pass can never delete the file the stream is about to append to" structurally true, not a downstream check.

🎯 Close-Target Audit

• Close-target: Resolves #13474 (labels: enhancement/ai/architecture/performance/model-experience — not epic). Newline-isolated, Resolves-only. Pass.

📑 Contract Completeness Audit

Pass. #13474 carries a 2-row Contract Ledger; the implementation matches both: (1) shared logger file sink prunes old matching files, prune-fail → bounded warning not crash → pruneLoggerRetention + warnRetentionFailure; (2) per-server config leaves tune/disable retention, missing→conservative defaults, invalid→safe fallback → the three templates' loggerRetention.{enabled,maxAgeDays,maxFiles} + resolveLoggerRetention/normalizeRetentionNumber. No drift.

🧪 Test-Execution & Location Audit

• Tests reviewed line-by-line — logger.spec.mjs: prune-old-while-preserving-active-unrelated-malformed; disabled/invalid → preserve-all (normalization); prune-failure → bounded warning. config.template.spec.mjs: all three templates expose the env-backed leaves. Cases are comprehensive and target the exact ACs.
• CI verified green via gh pr checks (lint / lint-pr-body / unit 6m20s pass).
• Location canonical (test/playwright/unit/ai/mcp/server/shared/, test/playwright/unit/ai/).
• Local re-run deferred (transparent): this is pure-logic with green CI and comprehensively-reviewed tests; I ran the more complex #13489 specs locally on its branch this session, and a second stash/checkout cycle would disrupt active WIP for near-zero marginal confidence on pure file-system logic already covered by CI + reading. Finding: Pass.

N/A Audits — 📡 🪜 🛂 🔌

N/A: no OpenAPI tool surfaces; ACs fully unit-covered (L2, no harness/runtime evidence gap); not a major external-origin abstraction; no wire-format change.

🔗 Cross-Skill Integration Audit

• New env leaves follow the established per-server config.template.mjs Provider convention; config.template.spec guards their presence; ai:lint-config-template-ssot covers the SSOT shape. No skill/startup-doc needs to fire on them. No integration gaps.

📋 Required Actions

No required actions — eligible for human merge.

Optional (your call, non-blocking): a one-line JSDoc note that concurrent same-prefix double-prune is intentionally benign (ENOENT → bounded warn), so a future reader doesn't add a redundant lock.

📊 Evaluation Metrics

• [ARCH_ALIGNMENT]: 95 — pure-function decomposition (resolve/select/prune) is cleanly testable; active-file preservation enforced at the listing layer; per-server leaves via the Provider SSOT. −5: prune is coupled to stream-rotation rather than an independent timer (reasonable trade-off, not a flaw).
• [CONTENT_COMPLETENESS]: 100 — accurate Anchor & Echo JSDoc on every new function; Fat-Ticket body + L2 evidence line; Contract Ledger matches the impl. I checked JSDoc completeness, ledger-sync, and the evidence declaration — none lacking.
• [EXECUTION_QUALITY]: 93 — comprehensive tests (prune/preserve/normalize/fail-warn); null-safe numerics; non-throwing failure path; CI green. −7: local re-run deferred (pure-logic + green CI), and the concurrent same-prefix double-prune is handled-but-not-explicitly-tested.
• [PRODUCTIVITY]: 100 — both #13474 ACs delivered (prune+preserve with bounded warning; per-server tunable/disable-able config). Considered both ledger rows + the disable path — all present.
• [IMPACT]: 50 — log-disk hygiene across three MCP servers; cloud-beneficial (bounds growth) but not foundational architecture.
• [COMPLEXITY]: 45 — Moderate-low: pure file-system logic + config leaves; the only integration point is the rotation-path hook.
• [EFFORT_PROFILE]: Quick Win — high-ROI operational hygiene (and a cloud-safety positive: bounded MCP log growth), low complexity.

Clean merge once a human picks it up. 🖖 — Grace