> 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/phase06-session05-isolation-boundary-and-sandbox-diagnostics/implementation_summary.md).

# Implementation Summary

**Session ID**: `phase06-session05-isolation-boundary-and-sandbox-diagnostics` **Package**: cross-cutting (`packages/protocol`, `apps/server`, `apps/cli`, `apps/hooks`) **Completed**: 2026-05-30 **Duration**: 0.5 hours

***

## Overview

Implemented the Phase 06 local isolation boundary and sandbox diagnostics session. The work added shared protocol vocabulary for executor posture and redaction, compact server-side isolation diagnostics, CLI-facing posture summaries, deterministic unsupported-route classification, and docs that keep future executors explicitly deferred. The session does not add real file, git, terminal, Docker, remote, or hosted execution.

***

## Deliverables

### Files Created

| File                                                                                                        | Purpose                                                               | Lines |
| ----------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------- | ----- |
| `docs/isolation-and-sandbox.md`                                                                             | Source-backed isolation threat model and future executor requirements | \~260 |
| `packages/protocol/src/isolation.ts`                                                                        | Shared isolation posture, diagnostic, and redaction contracts         | \~240 |
| `packages/protocol/tests/isolation.test.ts`                                                                 | Protocol vocabulary and exhaustiveness coverage                       | \~140 |
| `apps/server/src/lib/isolationDiagnostics.ts`                                                               | Compact server isolation diagnostics builder                          | \~220 |
| `apps/server/tests/isolationDiagnostics.test.ts`                                                            | Server diagnostics, redaction, auth, and no-mutation coverage         | \~180 |
| `.spec_system/specs/phase06-session05-isolation-boundary-and-sandbox-diagnostics/validation.md`             | Session validation report and pass evidence                           | \~40  |
| `.spec_system/specs/phase06-session05-isolation-boundary-and-sandbox-diagnostics/IMPLEMENTATION_SUMMARY.md` | Session closeout summary                                              | \~90  |

### Files Modified

| File                                                                                                      | Changes                                                                |
| --------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------- |
| `packages/protocol/src/index.ts`                                                                          | Exported isolation contracts from the package barrel                   |
| `packages/protocol/src/rest.ts`                                                                           | Refined route family vocabulary and compact unsupported-status mapping |
| `packages/protocol/tests/rest.test.ts`                                                                    | Added route-family and unsupported-envelope coverage                   |
| `packages/protocol/README_protocol.md`                                                                    | Documented protocol ownership of isolation contracts                   |
| `docs/api/event-api-hook-contracts.md`                                                                    | Added isolation diagnostics and unsupported-route contract notes       |
| `apps/server/src/routes/diagnostics.ts`                                                                   | Wired the isolation diagnostics route                                  |
| `apps/server/src/lib/orchestrationDiagnostics.ts`                                                         | Added a compact isolation summary to orchestration diagnostics         |
| `apps/server/src/lib/unsupportedRoutes.ts`                                                                | Tightened deterministic unsupported-route classification and redaction |
| `apps/server/src/managers/guardedActions.ts`                                                              | Kept approvals non-executing with family-specific unavailable reasons  |
| `apps/server/tests/unsupportedRoutes.test.ts`                                                             | Covered redacted unsupported-route envelopes                           |
| `apps/server/tests/guardedActions.test.ts`                                                                | Covered guarded-action no-execution behavior                           |
| `apps/server/README_server.md`                                                                            | Documented isolation diagnostics and no-execution boundary             |
| `apps/cli/src/lib/orchestrationDiagnostics.js`                                                            | Added compact isolation diagnostics parsing and sanitization           |
| `apps/cli/src/commands/status.js`                                                                         | Printed isolation posture in status output                             |
| `apps/cli/src/commands/doctor.js`                                                                         | Checked isolation posture in doctor output                             |
| `apps/cli/tests/orchestrationDiagnostics.test.js`                                                         | Covered compact isolation output and redaction                         |
| `apps/cli/tests/cliRuntime.test.js`                                                                       | Covered status and doctor isolation output                             |
| `apps/cli/README_cli.md`                                                                                  | Documented CLI isolation posture and recovery boundary                 |
| `apps/hooks/README_hooks.md`                                                                              | Documented hook executor boundary and diagnostic limits                |
| `apps/hooks/tests/orchestrationDiagnostics.test.js`                                                       | Covered silent, sanitized hook diagnostics                             |
| `.spec_system/specs/phase06-session05-isolation-boundary-and-sandbox-diagnostics/implementation-notes.md` | Recorded implementation progress and verification results              |
| `.spec_system/specs/phase06-session05-isolation-boundary-and-sandbox-diagnostics/security-compliance.md`  | Recorded security and compliance review                                |
| `.spec_system/state.json`                                                                                 | Marked the session complete and advanced the session history           |
| `.spec_system/PRD/phase_06/PRD_phase_06.md`                                                               | Updated Phase 06 progress tracking                                     |
| `package.json`                                                                                            | Bumped the root patch version                                          |

***

## Technical Decisions

1. **Protocol-first isolation vocabulary**: executor posture, unsupported reasons, and redaction categories live in `packages/protocol` so server and CLI consumers share the same source of truth.
2. **Compact diagnostics only**: server and CLI diagnostics expose bounded labels, counts, and posture state without raw prompts, commands, paths, logs, backups, or workspace contents.
3. **Keep executors deferred**: file, git, terminal, Docker, remote, hosted, and Worker execution remain out of scope until a later approved session explicitly designs and authorizes them.

***

## Test Results

| Metric           | Value                                        |
| ---------------- | -------------------------------------------- |
| Focused Vitest   | 8 files passed, 38 tests passed              |
| Repo-wide Vitest | 2084 passed, 1 skipped                       |
| Typecheck        | `packages/protocol` and `apps/server` passed |
| Biome            | Focused format and lint checks passed        |
| Hygiene          | ASCII, LF, and `git diff --check` passed     |

***

## Lessons Learned

1. Isolation posture is easiest to keep honest when the protocol, diagnostics, and unsupported-route envelopes share the same compact vocabulary.
2. Narrow recovery language matters because local diagnostics can otherwise drift into claims about trusted erasure or execution capability.

***

## Future Considerations

Items for future sessions:

1. Session 06 should harden mobile cockpit layout, keyboard, pointer, screen-reader, and reduced-motion behavior.
2. Session 07 should validate the Phase 06 closeout evidence and document the remaining Phase 07-08 deferrals.

***

## Session Statistics

* **Tasks**: 22 completed
* **Files Created**: 7
* **Files Modified**: 22+
* **Tests Added**: 5
* **Blockers**: 0 resolved


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