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# Implementation Summary

**Session ID**: `phase16-session02-backend-endpoint-parity-write-safety` **Completed**: 2026-06-02 **Duration**: 3-4 hours

***

## Overview

Completed the Hermes backend endpoint parity session by extending the dev and admin bridges with the missing read and write endpoints, generalizing path confinement, and hardening the write path with shared preflight and command execution helpers. Focused tests and script typecheck passed, and the session was closed out in the spec state and phase PRD.

***

## Deliverables

### Files Created

| File                                                                                                  | Purpose                                    | Lines |
| ----------------------------------------------------------------------------------------------------- | ------------------------------------------ | ----- |
| `.spec_system/specs/phase16-session02-backend-endpoint-parity-write-safety/validation.md`             | Validation record for the session closeout | \~20  |
| `.spec_system/specs/phase16-session02-backend-endpoint-parity-write-safety/IMPLEMENTATION_SUMMARY.md` | Session summary and closeout record        | \~45  |

### Files Modified

| File                                                                           | Changes                                                                         |
| ------------------------------------------------------------------------------ | ------------------------------------------------------------------------------- |
| `scripts/lib/hermes-dev-bridge.ts`                                             | Added missing Hermes read endpoint families and safe reader helpers.            |
| `scripts/lib/hermes-admin-bridge.ts`                                           | Added `confinePath`, shared command execution, and the missing write endpoints. |
| `scripts/lib/__tests__/hermes-dev-bridge.test.ts`                              | Extended read-path coverage for the new dev bridge endpoints.                   |
| `scripts/lib/__tests__/hermes-admin-bridge.test.ts`                            | Extended write-safety coverage for the new admin bridge endpoints.              |
| `.spec_system/state.json`                                                      | Marked the session complete and cleared the active session.                     |
| `.spec_system/PRD/PRD.md`                                                      | Recorded the Phase 16 closeout note in the master PRD.                          |
| `.spec_system/PRD/phase_16/PRD_phase_16.md`                                    | Updated phase progress and session tracker status.                              |
| `.spec_system/PRD/phase_16/session_02_backend_endpoint_parity_write_safety.md` | Marked the session complete in the phase record.                                |
| `package.json`                                                                 | Bumped the patch version.                                                       |
| `README.md`                                                                    | Updated the visible project version.                                            |

***

## Technical Decisions

1. **Shared `confinePath` helper**: Removed ad hoc file-op path checks so all write handlers use the same confinement rule.
2. **Command execution wrapper**: Centralized argv-array spawn, timeout, output capping, and redaction so mission optimize and sync paths stay consistent.

***

## Test Results

| Metric   | Value        |
| -------- | ------------ |
| Tests    | 33           |
| Passed   | 33           |
| Coverage | Not measured |

***

## Lessons Learned

1. The bridge split already provides a clean boundary for extending Hermes without reintroducing monolithic route code.
2. Closeout is simpler when validation artifacts are written explicitly instead of inferred from task notes.

***

## Future Considerations

1. Session 03 should consume the new bridge endpoints through the client hook layer and demo fixtures.
2. Later Hermes phases still need the UI surface and long-tail parity work.

***

## Session Statistics

* **Tasks**: 25 completed
* **Files Created**: 2
* **Files Modified**: 10
* **Tests Added**: 0
* **Blockers**: 0 resolved


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