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# Implementation Summary

**Session ID**: `phase18-session01-protocol-suggestion-contract-parity` **Package**: packages/protocol **Completed**: 2026-06-09 **Duration**: 0.7 hours

***

## Overview

Completed the protocol-first Quest Board suggestion contract foundation for Phase 18. The session adds typed suggestion source cards, `suggestion_update` snapshots, accept/dismiss/scan/summary contracts, fail-closed validators, bounded normalization helpers, focused tests, documentation, and validation artifacts. Validation also fixed the pre-existing web test failure caused by ignored local env files being loaded by Vitest.

***

## Deliverables

### Files Created

| File                                                                                              | Purpose                                                                                          | Lines |
| ------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------ | ----- |
| `packages/protocol/src/suggestions.ts`                                                            | Suggestion vocabularies, constants, card contracts, REST contracts, guards, parsers, and helpers | 1079  |
| `packages/protocol/tests/suggestions.test.ts`                                                     | Suggestion contract, parser, bounds, snapshot, path, and freshness coverage                      | 350   |
| `.spec_system/specs/phase18-session01-protocol-suggestion-contract-parity/validation.md`          | PASS validation report                                                                           | 207   |
| `.spec_system/specs/phase18-session01-protocol-suggestion-contract-parity/security-compliance.md` | Security and GDPR review                                                                         | 86    |

### Files Modified

| File                                                                                               | Changes                                                                                                            |
| -------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------ |
| `packages/protocol/src/events.ts`                                                                  | Added `suggestion_update`, kept typed `idle_suggestion` compatibility, retired `quest_board` from the active union |
| `packages/protocol/src/index.ts`                                                                   | Exported the suggestions module                                                                                    |
| `packages/protocol/src/rest.ts`                                                                    | Added suggestion route-family aliases                                                                              |
| `packages/protocol/tests/events.test.ts`                                                           | Added event contract and retirement coverage                                                                       |
| `packages/protocol/tests/rest.test.ts`                                                             | Added suggestion REST alias coverage                                                                               |
| `packages/protocol/README_protocol.md`                                                             | Documented Quest Board contract ownership, compatibility, downstream order, and privacy boundaries                 |
| `vitest.config.ts`                                                                                 | Disabled Vite env-file loading during tests so local `.env.local` files cannot change deterministic test defaults  |
| `.spec_system/specs/phase18-session01-protocol-suggestion-contract-parity/tasks.md`                | Marked all tasks complete                                                                                          |
| `.spec_system/specs/phase18-session01-protocol-suggestion-contract-parity/implementation-notes.md` | Recorded completion and validation evidence                                                                        |
| `.spec_system/state.json`                                                                          | Marked session complete and cleared current session                                                                |
| `.spec_system/PRD/phase_18/PRD_phase_18.md`                                                        | Updated phase progress to 1/11 sessions                                                                            |
| `.spec_system/PRD/phase_18/session_01_protocol_suggestion_contract_parity.md`                      | Marked session stub complete                                                                                       |
| `.spec_system/PRD/PRD.md`                                                                          | Updated Phase 18 status to in progress                                                                             |
| `packages/protocol/package.json`                                                                   | Bumped package version to 0.1.40                                                                                   |
| `package-lock.json`                                                                                | Updated protocol workspace lockfile version                                                                        |

***

## Technical Decisions

1. **Protocol-first source of truth**: Added `suggestions.ts` as the shared contract owner so later server and web sessions consume the same shapes.
2. **Canonical snapshot plus compatibility**: Added `suggestion_update` as the canonical snapshot event, kept `idle_suggestion` typed for compatibility, and retired the unused `quest_board` event from the active union.
3. **Fail-closed pure helpers**: Kept validation dependency-free and deterministic, with explicit parser results, capped arrays, bounded text, and repo-relative path checks.
4. **Test env isolation**: Disabled Vite env-file discovery in Vitest so ignored local env files do not alter local-only web test defaults.

***

## Test Results

| Metric                 | Value                                                     |
| ---------------------- | --------------------------------------------------------- |
| Focused protocol tests | 3 files, 28 tests passed                                  |
| Focused web tests      | 103 files, 1796 tests passed                              |
| Root tests             | 197 files passed, 1 skipped; 2532 tests passed, 1 skipped |
| Format                 | `npm run format:check` passed                             |
| Lint                   | `npm run lint` passed                                     |
| Typecheck              | `npm run typecheck --workspaces --if-present` passed      |
| Security               | `npm run security:secrets` passed                         |
| Coverage               | Not collected                                             |

***

## Lessons Learned

1. Vitest can load ignored Vite env files by default, so tests that assert local-only browser defaults need runner-level env-file isolation.
2. Workspace version bumps should keep package-lock changes limited to the intended package version entry.

***

## Future Considerations

Items for future sessions:

1. Session 02 should build the server-side SuggestionManager against these protocol contracts.
2. Session 03 should validate route payloads against these shared shapes before emitting `suggestion_update`.
3. Web sessions should keep local env defaults explicit in tests when they need Worker or hosted-service config.

***

## Session Statistics

* **Tasks**: 23 completed
* **Files Created**: 5
* **Files Modified**: 15
* **Tests Added**: 28 focused protocol assertions
* **Blockers**: 1 resolved - local env-file pollution in web tests


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