FU-P12-T3-1: Document unused error_message parameter in MetricsCollector.record_response

SPECS/ARCHIVE/FU-P12-T3-1_Document_unused_error_message_parameter_in_MetricsCollector_record_response/FU-P12-T3-1_Document_unused_error_message_parameter_in_MetricsCollector_record_response.md

@@ -0,0 +1,78 @@
+# PRD: FU-P12-T3-1 — Document unused `error_message` parameter in `MetricsCollector.record_response`
+
+**Created:** 2026-02-19
+**Priority:** P3
+**Branch:** `codex/feature/FU-P12-T3-1-document-error-message-param`
+**Status:** PLAN
+
+---
+
+## 1. Problem Statement
+
+`MetricsCollector.record_response()` accepts `error_message` to mirror the
+shared-store API shape, but the in-memory collector never persists that value.
+The current docstring does not explicitly state this, which can mislead future
+maintainers.
+
+---
+
+## 2. Scope
+
+### In Scope
+- Update the `error_message` docstring in `MetricsCollector.record_response()`
+  to explicitly note compatibility-only behavior.
+
+### Out of Scope
+- Any functional logic changes to metrics collection.
+- Changes to `SharedMetricsStore` persistence behavior.
+- API signature changes.
+
+---
+
+## 3. Deliverables
+
+1. Docstring clarification
+- `src/mcpbridge_wrapper/webui/metrics.py`
+- Add explicit note: `error_message` is accepted for interface symmetry but not
+  persisted in the in-memory collector.
+
+2. Validation artifact
+- `SPECS/INPROGRESS/FU-P12-T3-1_Validation_Report.md`
+
+---
+
+## 4. Acceptance Criteria
+
+- [ ] Docstring clearly notes `error_message` is accepted for API symmetry but
+  not stored in-memory.
+- [ ] No functional behavior changes.
+- [ ] `pytest` passes.
+- [ ] `ruff check src/` passes.
+- [ ] `mypy src/` passes.
+- [ ] `pytest --cov` reports coverage >= 90%.
+
+---
+
+## 5. Dependencies
+
+- P12-T3 ✅
+
+---
+
+## 6. Risks and Mitigations
+
+- **Risk:** Wording may be too vague and still imply optional persistence.
+  - **Mitigation:** Use direct phrasing: accepted for compatibility, ignored for
+    storage in this collector.
+
+---
+
+## 7. Validation Plan
+
+1. Update the target docstring line in `metrics.py`.
+2. Run quality gates to confirm no behavior regressions.
+3. Record results in validation report.
+
+---
+**Archived:** 2026-02-19
+**Verdict:** PASS

SPECS/ARCHIVE/FU-P12-T3-1_Document_unused_error_message_parameter_in_MetricsCollector_record_response/FU-P12-T3-1_Validation_Report.md

@@ -0,0 +1,38 @@
+# Validation Report — FU-P12-T3-1
+
+**Task:** FU-P12-T3-1 — Document unused `error_message` parameter in `MetricsCollector.record_response`  
+**Date:** 2026-02-19  
+**Verdict:** PASS
+
+## Scope
+
+- Clarified `MetricsCollector.record_response()` docstring for
+  `error_message`: accepted for API compatibility with `SharedMetricsStore`,
+  but not stored by the in-memory collector.
+- No functional code changes were introduced.
+
+## Files Changed
+
+- `src/mcpbridge_wrapper/webui/metrics.py`
+
+## Required Quality Gates
+
+- `pytest`
+  - Result: **PASS** (`594 passed, 5 skipped, 2 warnings`)
+- `ruff check src/`
+  - Result: **PASS** (`All checks passed!`)
+- `mypy src/`
+  - Result: **PASS** (`Success: no issues found in 18 source files`)
+- `pytest --cov`
+  - Result: **PASS** (`594 passed, 5 skipped, 2 warnings`; total coverage **92.18%**, threshold 90%)
+
+## Acceptance Criteria Status
+
+- [x] Docstring clearly notes `error_message` is accepted for API symmetry but
+  not stored in-memory.
+- [x] No functional changes.
+
+## Notes
+
+- Existing third-party deprecation warnings from `websockets` / `uvicorn` were
+  observed during test runs and are unrelated to this task.

SPECS/ARCHIVE/INDEX.md

@@ -1,6 +1,6 @@
 # mcpbridge-wrapper Tasks Archive
 
-**Last Updated:** 2026-02-19 (REVIEW_fu_p12_t1_6_uniform_client_widget_escaping_archived)
+**Last Updated:** 2026-02-19 (REVIEW_fu_p12_t3_1_error_message_docstring_archived)
 
 ## Archived Tasks
 
@@ -121,6 +121,7 @@
 | FU-P12-T1-4 | [FU-P12-T1-4_Make_IN_FLIGHT_KPI_reflect_real_in_flight_requests_in_shared_metrics_mode/](FU-P12-T1-4_Make_IN_FLIGHT_KPI_reflect_real_in_flight_requests_in_shared_metrics_mode/) | 2026-02-19 | PASS |
 | FU-P12-T1-5 | [FU-P12-T1-5_Cap_clients_dict_and_prune_client_identities_to_prevent_unbounded_growth/](FU-P12-T1-5_Cap_clients_dict_and_prune_client_identities_to_prevent_unbounded_growth/) | 2026-02-19 | PASS |
 | FU-P12-T1-6 | [FU-P12-T1-6_Uniform_HTML_escaping_in_renderClientWidgets/](FU-P12-T1-6_Uniform_HTML_escaping_in_renderClientWidgets/) | 2026-02-19 | PASS |
+| FU-P12-T3-1 | [FU-P12-T3-1_Document_unused_error_message_parameter_in_MetricsCollector_record_response/](FU-P12-T3-1_Document_unused_error_message_parameter_in_MetricsCollector_record_response/) | 2026-02-19 | PASS |
 | FU-P12-T3-2 | [FU-P12-T3-2_Add_error_code_column_to_audit_CSV_export/](FU-P12-T3-2_Add_error_code_column_to_audit_CSV_export/) | 2026-02-19 | PASS |
 
 ## Historical Artifacts
@@ -206,6 +207,7 @@
 | [REVIEW_FU-P12-T1-4_in_flight_shared_metrics.md](_Historical/REVIEW_FU-P12-T1-4_in_flight_shared_metrics.md) | Review report for FU-P12-T1-4 |
 | [REVIEW_FU-P12-T1-5_client_identity_retention.md](_Historical/REVIEW_FU-P12-T1-5_client_identity_retention.md) | Review report for FU-P12-T1-5 |
 | [REVIEW_FU-P12-T1-6_uniform_client_widget_escaping.md](_Historical/REVIEW_FU-P12-T1-6_uniform_client_widget_escaping.md) | Review report for FU-P12-T1-6 |
+| [REVIEW_FU-P12-T3-1_error_message_docstring.md](_Historical/REVIEW_FU-P12-T3-1_error_message_docstring.md) | Review report for FU-P12-T3-1 |
 | [REVIEW_FU-P12-T3-2_error_code_csv_export.md](_Historical/REVIEW_FU-P12-T3-2_error_code_csv_export.md) | Review report for FU-P12-T3-2 |
 
 ## Archive Log
@@ -366,5 +368,7 @@
 | 2026-02-19 | FU-P12-T1-5 | Archived REVIEW_FU-P12-T1-5_client_identity_retention report |
 | 2026-02-19 | FU-P12-T1-6 | Archived Uniform_HTML_escaping_in_renderClientWidgets (PASS) |
 | 2026-02-19 | FU-P12-T1-6 | Archived REVIEW_FU-P12-T1-6_uniform_client_widget_escaping report |
+| 2026-02-19 | FU-P12-T3-1 | Archived Document_unused_error_message_parameter_in_MetricsCollector_record_response (PASS) |
+| 2026-02-19 | FU-P12-T3-1 | Archived REVIEW_FU-P12-T3-1_error_message_docstring report |
 | 2026-02-19 | FU-P12-T3-2 | Archived Add_error_code_column_to_audit_CSV_export (PASS) |
 | 2026-02-19 | FU-P12-T3-2 | Archived REVIEW_FU-P12-T3-2_error_code_csv_export report |

SPECS/ARCHIVE/_Historical/REVIEW_FU-P12-T3-1_error_message_docstring.md

@@ -0,0 +1,33 @@
+## REVIEW REPORT — FU-P12-T3-1 error_message docstring
+
+**Scope:** origin/main..HEAD
+**Files:** 8
+
+### Summary Verdict
+- [x] Approve
+- [ ] Approve with comments
+- [ ] Request changes
+- [ ] Block
+
+### Critical Issues
+- None.
+
+### Secondary Issues
+- None.
+
+### Architectural Notes
+- Documentation now makes the interface contract explicit: the in-memory
+  collector accepts `error_message` for compatibility with shared metrics API
+  shape but does not persist it.
+- Behavior remains unchanged by design.
+
+### Tests
+- Quality gates rerun and passing:
+  - `pytest` (`594 passed, 5 skipped, 2 warnings`)
+  - `ruff check src/` (`All checks passed!`)
+  - `mypy src/` (`Success: no issues found in 18 source files`)
+  - `pytest --cov` (`92.18%`, threshold `>=90%`)
+
+### Next Steps
+- No actionable follow-up items identified.
+- FOLLOW-UP step can be skipped for this task.

SPECS/INPROGRESS/next.md

@@ -2,15 +2,13 @@
 
 ## Recently Archived
 
+- 2026-02-19 — FU-P12-T3-1: Document unused `error_message` parameter in `MetricsCollector.record_response` (PASS)
 - 2026-02-19 — FU-P12-T1-6: Uniform HTML escaping in `renderClientWidgets` (PASS)
 - 2026-02-19 — FU-P12-T1-5: Cap `_clients` dict and prune `client_identities` to prevent unbounded growth (PASS)
 - 2026-02-19 — FU-P12-T1-4: Make `IN FLIGHT` KPI reflect real in-flight requests in shared-metrics mode (PASS)
 - 2026-02-19 — FU-P12-T3-2: Add `error_code` column to audit CSV export (PASS)
 - 2026-02-18 — FU-P12-T1-3: Show multi-client widgets in Web UI instead of single overwritten active client (PASS)
-- 2026-02-18 — FU-P12-T1-2: Add code comment clarifying stdin-only client capture in `on_request` (PASS)
 
 ## Suggested Next Tasks
 
-- P13-T5 follow-up — Complete interactive prompt verification in a desktop session (P1)
-- FU-P12-T3-1 — Document unused `error_message` parameter in `MetricsCollector.record_response` (P3)
-- Final scripted follow-up after this: no additional `pick_next_task` items remain
+- No pending tasks remain (`126/126` complete).

SPECS/Workplan.md

@@ -2302,16 +2302,17 @@ Phase 9 Follow-up Backlog
 
 ---
 
-#### ⬜️ FU-P12-T3-1: Document unused `error_message` parameter in `MetricsCollector.record_response`
+#### ✅ FU-P12-T3-1: Document unused `error_message` parameter in `MetricsCollector.record_response`
+- **Status:** ✅ Completed (2026-02-19)
 - **Description:** `MetricsCollector.record_response()` accepts `error_message: Optional[str]` for API symmetry with `SharedMetricsStore`, but never stores or uses it. Add a docstring note clarifying this parameter is accepted for interface compatibility but not persisted in the in-memory collector.
 - **Priority:** P3
 - **Dependencies:** P12-T3
 - **Parallelizable:** yes
 - **Outputs/Artifacts:**
   - Updated `src/mcpbridge_wrapper/webui/metrics.py` — docstring clarification on `error_message` parameter
 - **Acceptance Criteria:**
-  - [ ] Docstring clearly notes `error_message` is accepted for API symmetry but not stored in-memory
-  - [ ] No functional changes
+  - [x] Docstring clearly notes `error_message` is accepted for API symmetry but not stored in-memory
+  - [x] No functional changes
 
 ---
 

src/mcpbridge_wrapper/webui/metrics.py

@@ -173,7 +173,9 @@ def record_response(
             latency_ms: Explicit latency in milliseconds. If not provided and
                 request_id was tracked, latency is computed automatically.
             error_code: JSON-RPC error code (if error=True).
-            error_message: JSON-RPC error message (if error=True).
+            error_message: JSON-RPC error message (if error=True). Accepted for
+                API compatibility with SharedMetricsStore; not stored by the
+                in-memory collector.
         """
         now = time.time()
         with self._lock: