> For the complete documentation index, see [llms.txt](https://faction-os.gitbook.io/faction-os-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://faction-os.gitbook.io/faction-os-docs/.spec_system/archive/sessions/phase19-session01-protocol-and-events/implementation_summary.md). # Implementation Summary **Session ID**: `phase19-session01-protocol-and-events` **Package**: packages/protocol **Completed**: 2026-06-26 **Duration**: 3-4 hours *** ## Overview Session 01 completed the Phase 19 contract-first foundation in `packages/protocol`. It added command-center DTO families, dependency-free parser helpers, compact WebSocket event contracts, REST aliases, capability and unavailable-state envelopes, compatibility tests, and protocol documentation for later server and web sessions. *** ## Deliverables ### Files Created | File | Purpose | Lines | | ------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------- | ----- | | `packages/protocol/src/orchestrationCommandCenter.ts` | Phase 19 command-center DTOs, vocabularies, parser helpers, compact errors, REST payload shapes, and event payload shapes | 3527 | | `packages/protocol/tests/orchestrationCommandCenter.test.ts` | Runtime and type coverage for vocabularies, parsers, invalid payloads, blocked fields, and path safety | 619 | ### Files Modified | File | Changes | | ------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------- | | `packages/protocol/src/events.ts` | Added compact command-center WebSocket event interfaces to `ServerEvent`. | | `packages/protocol/src/rest.ts` | Added typed REST aliases and capability envelopes for planned command-center route families. | | `packages/protocol/src/index.ts` | Exported the new command-center protocol module. | | `packages/protocol/tests/events.test.ts` | Added command-center event union and compact no-raw-field coverage. | | `packages/protocol/tests/rest.test.ts` | Added REST alias and capability status coverage. | | `packages/protocol/tests/orchestration.test.ts` | Added compatibility checks for existing queue, template, lineage, and guarded-action payloads. | | `packages/protocol/README_protocol.md` | Documented contract ownership, unavailable-state semantics, blocked-payload boundaries, and module layout. | | `.spec_system/PRD/PRD.md` | Marked Phase 19 as in progress. | | `.spec_system/PRD/phase_19/PRD_phase_19.md` | Marked Session 01 complete and updated progress to 1/16 sessions. | | `.spec_system/PRD/phase_19/session_01_protocol_and_events.md` | Marked the session stub complete. | | `.spec_system/state.json` | Added the completed session, cleared `current_session`, and set Phase 19 in progress. | | `packages/protocol/package.json` | Bumped package version from 0.1.41 to 0.1.42. | | `package-lock.json` | Bumped the protocol workspace lockfile version to 0.1.42. | *** ## Technical Decisions 1. **Dependency-free protocol validation**: Kept `packages/protocol` aligned with existing const vocabulary, TypeScript interface, guard, and parser patterns instead of adding a schema runtime. 2. **Compact broad event frames**: Added command-center event shapes that carry IDs, summaries, status labels, revisions, and blocked-category labels rather than raw prompts, command bodies, diffs, terminal output, provider payloads, tokens, or file contents. 3. **Explicit unavailable states**: Modeled future executor and integration families with capability and unavailable envelopes so later sessions can distinguish unsupported, observe-only, proposal-only, ready, executing, executed, and failed behavior. 4. **Fail-closed boundary helpers**: Parser helpers reject unknown enum values, malformed IDs, unsafe paths, oversized compact arrays, and raw fields nested in objects or arrays. *** ## Test Results | Metric | Value | | ---------------------- | ------------------------------------------------------------ | | Focused Protocol Tests | 39 passed / 39 total | | Root Vitest Suite | 2678 passed / 2679 total, 1 skipped | | Typecheck | package and workspace typechecks passed | | Lint | Biome root lint passed | | Format Check | Biome root format check passed | | Security Scan | tracked-file secret scan passed | | Coverage | N/A - validation ran Vitest without coverage instrumentation | *** ## Lessons Learned 1. Broad command-center payloads need recursive raw-field blocking because arrays are a realistic nesting boundary for tasks, evidence, and commands. 2. Compact arrays should reject oversize inputs instead of truncating silently; truncation can corrupt dependency, evidence, filter, and label semantics. 3. Capability-first protocol contracts keep later execution work honest without implying server, hosted, or executor behavior before those sessions land. *** ## Future Considerations Items for future sessions: 1. Session 02 should consume these contracts in server managers, persistence, route validation, snapshot emission, and unavailable-state responses. 2. Session 03 should normalize the compact event and REST shapes before store mutation in the web orchestration shell. 3. Later executor, file/git, terminal/container, channel, and collaboration sessions should keep raw content in scoped local detail routes with explicit permission, audit, redaction, and output limits. *** ## Session Statistics * **Tasks**: 20 completed * **Files Created**: 2 protocol deliverables plus this summary * **Files Modified**: 13 tracked workflow, version, documentation, and protocol files * **Tests Added**: 39 focused protocol tests covered by validation * **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. 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