# Progress Log — Issue #1: Create Extension File Structure

## Session 1 — [2025-07-24]

### Task 001: Scaffold `.pi/extensions/pi-worktree.ts`

| Phase | Status | Notes |
|-------|--------|-------|
| Phase 0 (Context) | ✅ Done | Branch issue-1 from origin/main, docs found, TypeScript + TypeBox confirmed |
| Step 1 (Read Task) | ✅ Done | Issue #1: Create Extension File Structure. Acceptance: file exists, correct imports, loads without errors |
| Step 2 (Scaffold) | ✅ Done | Created full scaffold with types, tool schemas, helper stubs, and entry point |
| Step 3 (RED) | ✅ Done | Scaffold compiles — stub functions throw "not implemented" as expected |
| Step 4 (GREEN) | ✅ Done | `bun build` succeeds with no errors. All imports resolve from pi's global bun install.

### Scaffold Contents
- **Types**: `WorktreeEntry`, `WorktreeListResult`, `WorktreeError`
- **Tool schemas**: `createWorktreeParams`, `listWorktreeParams`, `switchWorktreeParams`, `removeWorktreeParams`
- **Helper stubs**: `parseWorktreeList()`, `pathExists()`, `resolveWorktreeTarget()`
- **Tools registered**: `git_worktree_create`, `git_worktree_list`, `git_worktree_switch`, `git_worktree_remove`
- **Command registered**: `/worktree` (stub)

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### Test Results

_N/A — validation is pi loading + TypeScript syntax. `bun build` passes with zero errors._