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# Implementation Summary

**Session ID**: `phase03-session04-guarded-local-action-runtime` **Package**: Cross-cutting (`packages/protocol`, `apps/server`, `apps/cli`) **Completed**: 2026-05-29 **Duration**: \~3 hours

***

## Overview

Implemented the guarded local action runtime for Phase 03. The session added shared guarded-action protocol contracts, server-side validation and in-memory state management, REST routes for proposal and decision handling, CLI helper support, and focused tests and docs. The runtime now fails closed for unsafe or unsupported local action families and emits compact, redacted states.

***

## Deliverables

### Files Created

| File                                             | Purpose                                                                                                | Lines |
| ------------------------------------------------ | ------------------------------------------------------------------------------------------------------ | ----- |
| `packages/protocol/src/guardedActions.ts`        | Guarded-action proposal, decision, result, unavailable, state, request, response, and event contracts  | \~221 |
| `apps/server/src/lib/guardedActionValidation.ts` | Server-side validators for guarded-action proposal and decision routes                                 | \~314 |
| `apps/server/src/managers/guardedActions.ts`     | Bounded in-memory guarded-action manager with idempotency, expiration, and duplicate-decision handling | \~391 |
| `apps/server/src/routes/guardedActions.ts`       | Guarded-action REST routes and WebSocket update emission                                               | \~167 |
| `apps/cli/src/lib/guardedActions.js`             | Local HTTP helper for guarded-action proposal and decision calls                                       | \~264 |
| `packages/protocol/tests/guardedActions.test.ts` | Protocol contract tests for guarded-action states, REST shapes, and WebSocket discriminants            | \~124 |
| `apps/server/tests/guardedActions.test.ts`       | Server route, manager, validation, expiration, duplicate-decision, and redaction tests                 | \~199 |
| `apps/cli/tests/guardedActions.test.js`          | CLI helper tests for auth headers, timeouts, compact errors, and sanitized output                      | \~124 |

### Files Modified

| File                                            | Changes                                                                                           |
| ----------------------------------------------- | ------------------------------------------------------------------------------------------------- |
| `packages/protocol/src/index.ts`                | Exported guarded-action contracts                                                                 |
| `packages/protocol/src/rest.ts`                 | Added guarded-action REST request and response contracts                                          |
| `packages/protocol/src/events.ts`               | Added guarded-action update events and guarded-action decision client messages                    |
| `apps/server/src/server.ts`                     | Registered guarded-action routes and dependencies                                                 |
| `apps/server/src/ws/clientMessageValidation.ts` | Validated guarded-action WebSocket decisions with bounded IDs and reasons                         |
| `apps/server/src/ws/handlers.ts`                | Processed guarded-action WebSocket decisions with duplicate-trigger prevention                    |
| `apps/server/tests/websocket.test.ts`           | Covered guarded-action update frames and duplicate decision handling                              |
| `apps/server/tests/authBoundaries.test.ts`      | Confirmed guarded-action HTTP routes inherit bearer auth before validation or mutation            |
| `apps/server/tests/unsupportedRoutes.test.ts`   | Confirmed unsupported file/git/terminal/remote/container paths remain deterministic 501 responses |
| `docs/api/README_api.md`                        | Documented guarded-action route and WebSocket runtime boundaries                                  |
| `docs/api/event-api-hook-contracts.md`          | Recorded guarded-action route-family, WebSocket, and safety contract status                       |
| `.spec_system/state.json`                       | Marked the session complete and updated phase history                                             |
| `.spec_system/PRD/phase_03/PRD_phase_03.md`     | Advanced the Phase 03 progress tracker and upcoming session list                                  |
| `.spec_system/PRD/PRD.md`                       | Marked the guarded local action runtime as shipped in the Phase 03 status map                     |
| `package.json`                                  | Bumped the project patch version                                                                  |

***

## Technical Decisions

1. **Protocol-first contracts**: shared guarded-action shapes live in `packages/protocol` before server or CLI code consumes them.
2. **Fail-closed local runtime**: unsupported or unsafe action families return explicit unavailable or failure states instead of hidden execution.

***

## Test Results

| Metric   | Value        |
| -------- | ------------ |
| Tests    | 1875         |
| Passed   | 1874         |
| Coverage | Not reported |

***

## Lessons Learned

1. Duplicate decisions need explicit idempotency guards across HTTP and WebSocket paths.
2. Compact validation and failure envelopes make the runtime easier to expose safely in later orchestration UI work.

***

## Future Considerations

Items for future sessions:

1. Surface the guarded-action runtime in the web orchestration cockpit.
2. Extend CLI diagnostics around guarded-action state and recovery paths.

***

## Session Statistics

* **Tasks**: 24 completed
* **Files Created**: 8
* **Files Modified**: 15
* **Tests Added**: 3
* **Blockers**: 0 resolved


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