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# Implementation Summary

**Session ID**: `phase20-session06-file-mutation-core` **Package**: null **Completed**: 2026-06-28 **Duration**: 0.4 hours

***

## Overview

Phase 20 Session 06 delivered the core file mutation contract and server manager. The protocol now validates read, preview, write, edit, delete, move, rename, and rollback metadata, while the server can safely mutate real workspace files with repo-relative path validation, stale hash guards, local backups, active file-intent conflict checks, compact execution-run records, and rollback support. File executor integration remains intentionally deferred to Session 07.

***

## Deliverables

### Files Created

| File                                                                              | Purpose                                                                                                       | Lines |
| --------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------- | ----- |
| `.spec_system/specs/phase20-session06-file-mutation-core/spec.md`                 | Session specification and acceptance scope.                                                                   | 219   |
| `.spec_system/specs/phase20-session06-file-mutation-core/tasks.md`                | Completed 22-task checklist.                                                                                  | 73    |
| `.spec_system/specs/phase20-session06-file-mutation-core/implementation-notes.md` | Task evidence and verification ledger.                                                                        | 624   |
| `.spec_system/specs/phase20-session06-file-mutation-core/code-review.md`          | Review findings and resolved fixes.                                                                           | 72    |
| `.spec_system/specs/phase20-session06-file-mutation-core/security-compliance.md`  | Security and GDPR assessment.                                                                                 | 83    |
| `.spec_system/specs/phase20-session06-file-mutation-core/validation.md`           | Final PASS validation evidence.                                                                               | 194   |
| `apps/server/src/managers/fileMutationManager.ts`                                 | Core file mutation, backup, rollback, redaction, and execution evidence manager.                              | 1081  |
| `apps/server/tests/fileMutationManager.test.ts`                                   | Temp-directory mutation, rollback, conflict, path rejection, stale hash, backup failure, and redaction tests. | 499   |
| `packages/protocol/tests/fileMutation.test.ts`                                    | Protocol coverage for mutation request/result parsing, rollback metadata, and blocked raw-field rejection.    | 269   |

### Files Modified

| File                                                         | Changes                                                                                                                                                                      |
| ------------------------------------------------------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `packages/protocol/src/orchestrationCommandCenter.ts`        | Added file mutation operation, request, result, backup, rollback, safe execution metadata, parser helpers, and raw-field rejection.                                          |
| `packages/protocol/src/rest.ts`                              | Added `operation_failed` as a bounded operation failure error code.                                                                                                          |
| `packages/protocol/tests/orchestrationCommandCenter.test.ts` | Added compact file execution attachment compatibility and raw content rejection coverage.                                                                                    |
| `apps/server/src/managers/taskExecutionCoordinator.ts`       | Narrowed execution attachment handling for the new file attachment union.                                                                                                    |
| `apps/server/src/routes/terminalContainers.ts`               | Preserved terminal route compatibility with narrowed execution attachment handling.                                                                                          |
| `apps/server/tests/commandCenterManager.test.ts`             | Proved command-center rows and events keep file metadata compact and exclude raw content, patch bodies, broad absolute paths, tokens, stdout, stderr, and provider payloads. |
| `apps/web/src/store/useGameStore.ts`                         | Added terminal attachment kind checks for the expanded execution attachment union.                                                                                           |
| `apps/server/README_server.md`                               | Documented the manager-level file mutation boundary, backup location, redaction rules, and Session 07 integration handoff.                                                   |
| `docs/api/README_api.md`                                     | Documented file mutation contracts as manager-level behavior until guarded, queue, campaign, and UI integration ships.                                                       |
| `.spec_system/state.json`                                    | Marked the session complete and cleared `current_session`.                                                                                                                   |
| `.spec_system/PRD/phase_20/PRD_phase_20.md`                  | Updated Phase 20 progress and Session 06 completion tracking.                                                                                                                |
| `package.json`                                               | Bumped root version from 0.1.172 to 0.1.173.                                                                                                                                 |
| `package-lock.json`                                          | Bumped lockfile root version from 0.1.172 to 0.1.173.                                                                                                                        |
| `README.md`                                                  | Updated visible version badge from 0.1.172 to 0.1.173.                                                                                                                       |

***

## Technical Decisions

1. **Protocol-owned contract**: File mutation request, result, rollback, backup, and execution attachment shapes live in `packages/protocol` before server or UI paths consume them.
2. **Manager-owned filesystem boundary**: `FileMutationManager` owns path validation, backups, mutation, rollback, idempotency, conflict checks, and compact execution evidence.
3. **Fail-closed mutation flow**: Mutating operations validate paths, hashes, conflicts, and backup creation before writing, then recheck source and destination state immediately before mutation.
4. **Broad-summary privacy boundary**: Broad rows, events, docs, and tests expose operation, path labels, hashes, byte counts, backup ids, and rollback state only, not content or patch bodies.

***

## Test Results

| Metric              | Value                                        |
| ------------------- | -------------------------------------------- |
| Focused Vitest      | 42 passed, 0 failed                          |
| Full Vitest         | 3042 passed, 1 skipped, 0 failed             |
| Format              | PASS                                         |
| Lint                | PASS                                         |
| Workspace typecheck | PASS                                         |
| Protocol typecheck  | PASS                                         |
| Server typecheck    | PASS                                         |
| Whitespace          | PASS                                         |
| Coverage            | N/A - not produced by validation command set |

***

## Lessons Learned

1. Stale-hash checks need a final revalidation after backup creation so a file cannot change between preflight and mutation.
2. Rollback backup ids need a stricter grammar than generic command-center ids because they address local backup metadata.
3. File mutation proof should stay manager-level until guarded actions, queue tasks, campaign tasks, and web controls can all consume the same boundary in Session 07.

***

## Future Considerations

Items for future sessions:

1. Session 07 should wire `FileMutationManager` through guarded file approvals, queue execution, campaign execution, and visible web recovery controls.
2. File executor readiness should remain approved-not-executing until Session 07 proves end-to-end guarded and orchestrated file execution.
3. Release evidence should continue scanning broad rows, WebSocket events, docs, logs, and exports for raw content, patch body, absolute path, token, secret, provider payload, and diagnostic leakage.

***

## Session Statistics

* **Tasks**: 22 completed
* **Files Created**: 10
* **Files Modified**: 14
* **Tests Added**: 4 files with new or updated automated coverage
* **Blockers**: 0 resolved


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