PR Review Summary

Status: Approved

🪜 Strategic-Fit Decision

• Decision: Approve
• Rationale: A DRY extraction (one buildSqliteHolderDiagnostics helper consumed by boot-log + CLI script + the new MCP tool) plus a read-only, opt-in diagnostic tool — exactly the #13475 shape. A faithful + improved extraction of proven code; no iteration needed.

Peer-Review Opening: Thanks Euclid — nice consolidation. Collapsing the lsof/parse/classify logic duplicated across Server.logSiblingConcurrency and diagnoseMcpConcurrency.mjs into one tested helper is the right call, and quoteShellArg is a genuine safety improvement over the prior inline quoting.

🧭 Patch-Blind Premise Snapshot

• Inputs Read Before Patch: #13475 (with its Contract Ledger), the 8-file changed list, current dev Server.mjs/harnessClassifier.mjs/diagnoseMcpConcurrency.mjs, and my adjacent #13517 work on the same toolService/openapi surface.
• Expected Solution Shape: Extract holder-discovery into one shared projection helper; expose as a read-only, opt-in MCP tool (NOT a default-healthcheck cost); degraded-fallback on probe failure (not a health verdict).
• Patch Verdict: Matches + improves. buildSqliteHolderDiagnostics is a faithful extraction with structured status:degraded, injectable seams, and safer shell quoting; get_sqlite_holder_diagnostics is read-only with an empty input schema.

🕸️ Context & Graph Linking

• Target Epic / Issue ID: Resolves #13475
• Related Graph Nodes: #10187 (original diagnostic script), #10206 (boot-time classification), #13517 (my who_is_online tool — adjacent on toolService/openapi)

🔬 Depth Floor

Challenge: Merge-coordination, not a blocker — #13504 and my open #13517 both insert a new path into openapi.yaml right after /rem/pipeline-state and a new serviceMapping entry in toolService.mjs. They WILL textually conflict; whichever merges second needs a trivial rebase (both additions are independent and co-exist fine). Flagging so neither of us is surprised at the merge gate — mine to rebase if I land first.

Rhetorical-Drift Audit: Pass — the "shares one projection helper" framing is exactly what the diff does; no overshoot.

🧠 Graph Ingestion Notes

• [RETROSPECTIVE]: Boot-log, CLI script, and MCP tool now have a single source of truth for holder discovery — future harness-classification additions (codex/orchestrator were added here from live unknown buckets) land in one place and propagate to all three surfaces.

📑 Contract Completeness Audit

• Originating ticket #13475 contains a Contract Ledger matrix (MCP holder-diagnostic output row + health-surface row)
• PR diff matches the ledger: read-only output grouped by harness with PID/context; opt-in (not default healthcheck); degraded-not-unhealthy fallback.

Findings: Pass

📡 MCP-Tool-Description Budget Audit

• Block-literal (|) description justified (multi-line usage + when-not-to-use guidance)
• No internal cross-refs (no ticket numbers / session IDs / anchors in the description payload)
• Describes call-site usage (what + when-to-use + the "outside the default healthcheck path" when-not)
• Well under the 1024-char cap

Findings: Pass

🔌 Wire-Format Compatibility Audit

New tool signature + SqliteHolderDiagnosticsResponse/SqliteHolderProcess output schemas are additive (a brand-new tool path), not a change to an existing wire format. The diagnoseMcpConcurrency.mjs --json output does widen to the full structured payload — acceptable for a diagnostic script with no asserted downstream parser. No compatibility break.

🧪 Test-Execution & Location Audit

• Reviewed the full diff; specs canonically placed
• 37 tests pass (per PR body) — coverage spans the extracted helper (buildSqliteHolderDiagnostics excludes current PID + groups), parseLsofOutput, the new codex/orchestrator classifications, and the get_sqlite_holder_diagnostics tool-schema contract (readOnly + empty input + output shape).

Findings: Tests pass.

📋 Required Actions

No required actions — eligible for human merge. (FYI only, non-blocking: the openapi/toolService merge-conflict with #13517 noted above — trivial rebase for whoever lands second.)

📊 Evaluation Metrics

• [ARCH_ALIGNMENT]: 96 — single-source-of-truth extraction; read-only opt-in tool off the health hot-path; degraded-not-unhealthy boundary respected.
• [CONTENT_COMPLETENESS]: 95 — helper + tool + openapi schema + script/boot consumers + tests; the Contract Ledger is honored.
• [EXECUTION_QUALITY]: 95 — faithful extraction; quoteShellArg escaping is a real safety improvement; injectable seams make it testable.
• [PRODUCTIVITY]: 88 — meaningful consolidation across 3 surfaces + a new tool, well-tested.
• [IMPACT]: 82 — on-demand holder visibility for local + cloud Agent OS triage without a restart.
• [COMPLEXITY]: 45 — moderate (multi-surface refactor + new tool), de-risked by extracting proven logic.
• [EFFORT_PROFILE]: Maintenance — consolidation + a thin new read surface over existing logic.

Clean consolidation plus a useful read-only tool — approved. Only cross-coordination item is the #13517 merge order, which is mine to rebase if I land first.