# Orchestration Log Entry

### 2026-04-02T16-23-55Z - Error diagnostics parity slice for issue #585

| Field | Value |
|-------|-------|
| **Agent routed** | Cheritto (Platform Dev) |
| **Why chosen** | Needed transport-level parity work across Service, MCP, and CLI after McCauley blocked mismatched error envelopes. |
| **Mode** | `sync` |
| **Why this mode** | The work was a bounded implementation slice that needed to land before Nate could validate the final envelope shape. |
| **Files authorized to read** | `src/ExcelMcp.Service/**`, `src/ExcelMcp.McpServer/**`, `src/ExcelMcp.CLI/**`, `tests/ExcelMcp.McpServer.Tests/**`, `tests/ExcelMcp.CLI.Tests/**` |
| **File(s) agent must produce** | transport parity updates, `.squad/decisions/inbox/cheritto-error-diagnostics-first-slice.md` |
| **Outcome** | Completed — `ServiceResponse` now carries additive diagnostics (`exceptionType`, `hresult`, `innerError`) and both CLI and MCP expose `error`, `errorMessage`, `isError`, and structured failure details. |
