---
phase: quick-002
plan: 01
subsystem: edit-tool
tags: [mcp, pydantic, propose-and-review, edits, validation]

# Dependency graph
requires:
  - phase: quick-001
    provides: propose_and_review tool functionality
provides:
  - Fixed multi-patch mode (edits parameter) in propose_and_review
  - EditPair Pydantic model normalization
  - Optional new_string parameter
affects: [users of propose_and_review multi-patch mode]

# Tech tracking
tech-stack:
  added: [pytest-asyncio]
  patterns: [Pydantic model normalization pattern for EditPair objects]

key-files:
  created: []
  modified:
    - src/fs_mcp/server.py
    - src/fs_mcp/edit_tool.py
    - tests/test_propose_and_review_validation.py
    - pyproject.toml

key-decisions:
  - "Made new_string parameter optional with default empty string for multi-patch mode"
  - "Normalized EditPair Pydantic models to dicts to handle both v1 and v2"
  - "Added pytest-asyncio to dev dependencies to fix test infrastructure"

patterns-established:
  - "Pydantic model normalization: check for model_dump() (v2), then dict() (v1), then isinstance(dict)"

# Metrics
duration: 4min
completed: 2026-01-29
---

# Quick Task 002: Fix Multi-Patch Mode in propose_and_review

**Fixed two critical bugs preventing multi-patch mode from working: made new_string optional and normalized EditPair Pydantic models to dicts**

## Performance

- **Duration:** 4 min 8 sec
- **Started:** 2026-01-29T(timestamp)
- **Completed:** 2026-01-29T(timestamp)
- **Tasks:** 3
- **Files modified:** 4

## Accomplishments
- Multi-patch mode now works with only `path` and `edits` parameters
- EditPair Pydantic models correctly normalized to dicts for validation
- Added test coverage for multi-patch mode without new_string
- Fixed test infrastructure by adding pytest-asyncio

## Task Commits

Each task was committed atomically:

1. **Task 1: Make new_string optional** - `0c63891` (fix)
2. **Task 2: Normalize EditPair objects** - `dccde1c` (fix)
3. **Task 3: Add test for multi-patch mode** - `fe2c383` (test)

## Files Created/Modified
- `src/fs_mcp/server.py` - Made new_string parameter optional with default=""
- `src/fs_mcp/edit_tool.py` - Added EditPair normalization logic for Pydantic models
- `tests/test_propose_and_review_validation.py` - Added TestMultiPatchModeWithoutNewString class
- `pyproject.toml` - Added pytest-asyncio to dev dependencies

## Decisions Made

1. **Made new_string optional with empty string default**: Allows Intent 2 (Multi-Patch) to work as documented without requiring a top-level new_string parameter.

2. **Normalized EditPair models to dicts**: When edits parameter comes from MCP tool, items are EditPair Pydantic models. Validation code expected dicts. Added normalization to support both Pydantic v1 (.dict()) and v2 (.model_dump()).

3. **Added pytest-asyncio to dev dependencies**: Tests were failing because pytest-asyncio wasn't installed. This is a critical dev dependency for async test support.

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 3 - Blocking] Added pytest-asyncio to dev dependencies**
- **Found during:** Task 2 (running tests)
- **Issue:** Tests failing with "async def functions are not natively supported" - pytest-asyncio was missing
- **Fix:** Added pytest-asyncio>=0.23.0 to pyproject.toml dev dependencies and ran uv sync
- **Files modified:** pyproject.toml, uv.lock
- **Verification:** Tests now run successfully
- **Committed in:** dccde1c (Task 2 commit)

---

**Total deviations:** 1 auto-fixed (1 blocking)
**Impact on plan:** Essential for test execution. No scope creep.

## Issues Encountered

**Pre-existing test failures**: Found 3 tests expecting 500 char limit but code uses 2000 char limit. These are outdated tests not related to the bug fix. Not fixed as they don't block the current task.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness
- Multi-patch mode fully functional
- Bug reported in bug_report.md is resolved
- Users can now use edits parameter with only path, no new_string required
- All validation logic correctly handles both EditPair models and plain dicts

---
*Quick Task: 002*
*Completed: 2026-01-29*
