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# Implementation Summary

**Session ID**: `phase09-session01-contracts-and-naming-baseline` **Package**: `packages/protocol` **Completed**: 2026-05-31 **Duration**: 0.5 hours

***

## Overview

This session moved the shared protocol layer from a Claude-centered naming baseline to a provider-neutral contract that can represent Codex CLI without breaking existing Claude Code consumers.

The package now owns the shared `HeroCli` vocabulary, provider display metadata helpers, provider-neutral hook event names, Codex lifecycle hook names, and a small set of optional safe ingest fields. The implementation keeps deprecated Claude aliases in place so downstream imports continue to work while later sessions adopt the new names.

***

## Deliverables

### Files Created

| File                                                                                           | Purpose                                     | Lines |
| ---------------------------------------------------------------------------------------------- | ------------------------------------------- | ----- |
| `.spec_system/specs/phase09-session01-contracts-and-naming-baseline/validation.md`             | PASS validation record for session closeout | \~110 |
| `.spec_system/specs/phase09-session01-contracts-and-naming-baseline/IMPLEMENTATION_SUMMARY.md` | Session handoff summary                     | \~95  |
| `packages/protocol/tests/heroes.test.ts`                                                       | Focused hero CLI contract coverage          | 51    |

### Files Modified

| File                                        | Changes                                                                                                                |
| ------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------- |
| `packages/protocol/src/heroes.ts`           | Added `codex-cli`, provider metadata helpers, and provider-neutral comments.                                           |
| `packages/protocol/src/ingest.ts`           | Added provider-neutral hook event constants, Codex lifecycle names, optional safe metadata, and compatibility aliases. |
| `packages/protocol/tests/ingest.test.ts`    | Added provider-neutral event coverage, Codex metadata fixtures, alias checks, and negative privacy assertions.         |
| `packages/protocol/README_protocol.md`      | Added Phase 09 protocol ownership notes and downstream routing guidance.                                               |
| `.spec_system/state.json`                   | Marked the session complete and updated phase progress tracking.                                                       |
| `.spec_system/PRD/phase_09/PRD_phase_09.md` | Updated Phase 09 progress and session tracking status.                                                                 |
| `packages/protocol/package.json`            | Bumped the package patch version.                                                                                      |

***

## Technical Decisions

1. **Provider-neutral source of truth**: the new hook event vocabulary lives in `packages/protocol` and the deprecated Claude export references the same array to prevent alias drift.
2. **Compact safe metadata only**: Codex-specific ingest fields remain optional and bounded so later runtime sessions can normalize local details without promoting raw transcripts, prompts, patches, output, or credentials.

***

## Test Results

| Metric   | Value                 |
| -------- | --------------------- |
| Tests    | 4 validation commands |
| Passed   | 4                     |
| Coverage | Not measured          |

***

## Lessons Learned

1. Keeping the shared CLI vocabulary exhaustive makes later label and filter work easier for web and CLI consumers.
2. Alias exports are safer when they point at a single shared source array rather than duplicating values.

***

## Future Considerations

Items for future sessions:

1. Normalize hook runtime payloads in Session 02 using the new protocol helpers.
2. Add Codex-specific hook maps and handlers in Session 03 without widening the shared privacy boundary.

***

## Session Statistics

* **Tasks**: 18 completed
* **Files Created**: 3
* **Files Modified**: 7
* **Tests Added**: 2
* **Blockers**: 0 resolved


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