---
phase: 18-publishing-pipeline
plan: 01
subsystem: cli
tags: [manifest, chatgpt, ai-plugin, publishing, cargo-pmcp, json]

# Dependency graph
requires:
  - phase: 17-widget-authoring-dx-and-scaffolding
    provides: "cargo pmcp app new scaffolding and AppCommand enum"
provides:
  - "publishing::detect module for MCP Apps project detection from Cargo.toml"
  - "publishing::manifest module for ChatGPT-compatible ai-plugin.json generation"
  - "cargo pmcp app manifest --url <URL> CLI command"
  - "Auto-discovered widget-to-tool mappings from widgets/ directory"
affects: [18-02-PLAN, publishing-pipeline]

# Tech tracking
tech-stack:
  added: []
  patterns: ["publishing module pattern with detect + manifest separation"]

key-files:
  created:
    - cargo-pmcp/src/publishing/mod.rs
    - cargo-pmcp/src/publishing/detect.rs
    - cargo-pmcp/src/publishing/manifest.rs
  modified:
    - cargo-pmcp/src/commands/app.rs
    - cargo-pmcp/src/main.rs

key-decisions:
  - "detect_project takes explicit Path parameter (not cwd) for testability"
  - "WidgetInfo.html field included for future packaging pipeline (marked #[allow(dead_code)])"
  - "name_for_model replaces both hyphens and spaces with underscores"
  - "server_url trailing slash stripped before appending /openapi.json"

patterns-established:
  - "Publishing module: detect.rs for project introspection, manifest.rs for output generation"
  - "CLI manifest command: detect -> generate -> write pipeline"

requirements-completed: [PUBL-01]

# Metrics
duration: 5min
completed: 2026-02-26
---

# Phase 18 Plan 01: Manifest Generation Summary

**ChatGPT-compatible ai-plugin.json manifest generator with auto-discovered widget-to-tool mappings via `cargo pmcp app manifest --url <URL>`**

## Performance

- **Duration:** 4m 47s
- **Started:** 2026-02-26T17:41:01Z
- **Completed:** 2026-02-26T17:45:48Z
- **Tasks:** 2
- **Files modified:** 5

## Accomplishments
- Publishing module with project detection that validates pmcp dependency features (mcp-apps or full)
- Manifest JSON generation following ChatGPT ai-plugin.json schema v1 with mcp_apps extension
- Widget auto-discovery from widgets/ directory with sorted deterministic output
- CLI wiring as `cargo pmcp app manifest --url <URL> [--logo <URL>] [--output <dir>]`
- 30 unit tests covering detection edge cases, manifest structure, URL trimming, logo precedence

## Task Commits

Each task was committed atomically:

1. **Task 1: Create publishing module with project detection and manifest generation** - `f89fafa` (feat)
2. **Task 2: Wire manifest command into AppCommand CLI** - `0d27304` (feat)

## Files Created/Modified
- `cargo-pmcp/src/publishing/mod.rs` - Module declarations for publishing pipeline
- `cargo-pmcp/src/publishing/detect.rs` - MCP Apps project detection from Cargo.toml + widget discovery
- `cargo-pmcp/src/publishing/manifest.rs` - ChatGPT-compatible manifest JSON generation and file writing
- `cargo-pmcp/src/commands/app.rs` - Manifest variant on AppCommand enum + run_manifest handler
- `cargo-pmcp/src/main.rs` - Added `mod publishing` declaration

## Decisions Made
- `detect_project()` takes an explicit `&Path` parameter rather than reading cwd internally, enabling all tests to use tempfile directories without changing working directory
- `WidgetInfo.html` field included and populated from disk reads even though manifest generation does not use it -- reserved for the packaging pipeline in 18-02; marked with `#[allow(dead_code)]` to suppress warning
- `name_for_model` sanitization replaces both hyphens and spaces with underscores for ChatGPT model-name compatibility
- Server URL trailing slash is stripped before appending `/openapi.json` and before storing in mcp_apps.server_url

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 3 - Blocking] Added mod publishing to main.rs during Task 1**
- **Found during:** Task 1 (publishing module creation)
- **Issue:** Tests would not compile without the module being declared in main.rs, but the plan placed this in Task 2
- **Fix:** Moved the `mod publishing;` declaration into Task 1 to enable test verification
- **Files modified:** cargo-pmcp/src/main.rs
- **Verification:** All 30 publishing tests discovered and executed
- **Committed in:** f89fafa (Task 1 commit)

---

**Total deviations:** 1 auto-fixed (1 blocking)
**Impact on plan:** Minor ordering change -- mod declaration pulled forward from Task 2 to Task 1 for test visibility. No scope creep.

## Issues Encountered
None.

## User Setup Required
None - no external service configuration required.

## Next Phase Readiness
- Publishing detect + manifest modules ready for 18-02 (packaging/deployment)
- ProjectInfo and WidgetInfo types available for reuse in packaging pipeline
- Widget HTML content already read from disk and stored in WidgetInfo.html for bundling

## Self-Check: PASSED

All files verified present, all commit hashes found in git log.

---
*Phase: 18-publishing-pipeline*
*Completed: 2026-02-26*
