# McCauley — Orchestration Log

**Timestamp:** 2026-03-21T06:14:44Z  
**Session:** Stability Bug Investigation Planning  
**Role:** Lead

## Work Performed

- Reviewed last 10 merged PRs for patterns correlating with reported stability defects
- Cross-referenced PR history against `excel-mcp-stability-bug-report.md` symptoms
- Produced investigation sequence identifying highest-confidence observable signals
- Authored regression test strategy scoped to reported serial workflow patterns

## Findings

**Existing test coverage:** Core and MCP integration tests currently focus on command-level correctness and lifecycle controls (session create/close, batch timeout behavior, resource cleanup), proving deterministic isolation scenarios work.

**Coverage gaps:** Tests do not directly exercise the reported serial workflow: Power Query load sequence, post-timeout session state recovery, workbook reopen after failure, and cleanup resilience under session recycling.

**Confidence signals:** 
- Serial Power Query create → refresh → modify sequence represents the closest observable reproduction path
- Session timeout behavior during active query operations
- Workbook state after timeout and recovery

## Output

- Investigation sequence documented for Nate (Tester) and Hanna (COM Interop Expert)
- Regression-test-first approach recommended before code changes
- 3-phase test plan: baseline behavior, edge cases, recovery paths

## Team Updates

- Updated squad decision context with stability investigation framing
- Confirmed regression-first discipline for all code changes touching session/timeout/cleanup logic
