> For the complete documentation index, see [llms.txt](https://ai-os-and-trend-finder.gitbook.io/ai-os-and-trend-finder-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ai-os-and-trend-finder.gitbook.io/ai-os-and-trend-finder-docs/.spec_system/archive/sessions/phase25-session02-mission-schema-version-legacy-compatibility/implementation_summary.md). # Implementation Summary **Session ID**: `phase25-session02-mission-schema-version-legacy-compatibility` **Completed**: 2026-06-08 **Duration**: 0.9 hours *** ## Overview This session added mission schema versioning and hardened legacy mission-store normalization across the Hermes read and admin bridges. Mission documents now carry a current `schema_version`, older stores load safely through the AI OS envelope, malformed archived entries are contained, and the next authorized write persists upgraded shapes through the existing atomic write path. *** ## Deliverables ### Files Created | File | Purpose | Lines | | ------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------- | ----- | | `.spec_system/specs/phase25-session02-mission-schema-version-legacy-compatibility/implementation-notes.md` | Session progress log and verification notes. | \~240 | | `.spec_system/specs/phase25-session02-mission-schema-version-legacy-compatibility/security-compliance.md` | Security and compliance review for the session changes. | \~70 | | `.spec_system/specs/phase25-session02-mission-schema-version-legacy-compatibility/IMPLEMENTATION_SUMMARY.md` | Session completion summary. | \~70 | ### Files Modified | File | Changes | | ------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------ | | `scripts/lib/hermes-dev-bridge.ts` | Added versioned mission projections and hardened legacy normalization. | | `scripts/lib/hermes-admin-bridge.ts` | Wrote current schema versions on create/preview/commit and normalized store reads before writes. | | `src/lib/hermes-types.ts` | Added `schema_version` to the browser mission contract. | | `src/lib/hermes-admin-types.ts` | Added `schema_version` to the admin mission contract. | | `src/lib/hermes-demo-data.ts` | Updated demo mission fixtures to match the versioned contract. | | `docs/data-contract.md` | Documented the AI OS mission envelope and v2.3 incompatibility. | | `scripts/lib/__tests__/hermes-dev-bridge.test.ts` | Added legacy, malformed, active-pointer, and sanitization coverage. | | `scripts/lib/__tests__/hermes-admin-bridge.test.ts` | Added schema persistence and upgraded-store write coverage. | | `src/lib/__tests__/hermes-types.test.ts` | Added parser coverage for valid and malformed `schema_version` payloads. | | `src/lib/__tests__/hermes-admin-types.test.ts` | Added parser coverage for admin write, preview, and commit payloads. | | `.spec_system/state.json` | Marked the session complete and cleared the active session. | | `.spec_system/PRD/PRD.md` | Marked Phase 25 as in progress. | | `.spec_system/PRD/phase_25/PRD_phase_25.md` | Updated phase progress, session status, and upcoming session list. | | `.spec_system/PRD/phase_25/session_02_mission_schema_version_legacy_compatibility.md` | Marked the session stub complete. | | `package.json` | Bumped the patch version from `0.1.280` to `0.1.281`. | *** ## Technical Decisions 1. **Version at the bridge boundary**: mission schema versioning is stamped in the read and write bridge helpers so browser state and persisted stores stay aligned. 2. **Normalize before persistence**: existing store records are normalized on authorized write-path reads so the next admin write upgrades legacy shapes without introducing a new migration path. *** ## Test Results | Metric | Value | | ---------------- | ------ | | Tests | 53 | | Passed | 53 | | Typecheck | Passed | | Script typecheck | Passed | *** ## Lessons Learned 1. Contract versioning needs to be explicit in both the parser and writer paths or fixture drift appears quickly in typecheck. 2. Legacy mission stores are safest when normalization happens inside the same bridge layer that owns the atomic write path. *** ## Future Considerations 1. Session 03 can build on the versioned contract to add the safe planning prompt without reopening the storage compatibility work. 2. Later Phase 25 sessions should keep the browser contract authoritative and avoid exposing raw v2.3 endpoint envelopes. *** ## Session Statistics * **Tasks**: 20 completed * **Files Created**: 3 * **Files Modified**: 14 * **Tests Added**: 4 focused files * **Blockers**: 0 resolved --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://ai-os-and-trend-finder.gitbook.io/ai-os-and-trend-finder-docs/.spec_system/archive/sessions/phase25-session02-mission-schema-version-legacy-compatibility/implementation_summary.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.