---
name: ac-git-branch
description: "Creates new git branch with corresponding spec directory structure. Triggers on keywords: create branch, new branch, branch with spec"
project-agnostic: false
allowed-tools:
  - Bash
  - Write
---

# Create Branch with Spec Directory

Create a new git branch and its corresponding spec directory.

## Pre-Flight Checks

1. **Verify clean git state**:
   - If dirty: STOP and list uncommitted changes

2. **Validate branch name**:
   - Must be provided as argument
   - If empty: STOP with "Branch name required"

## Execution

1. **Create and checkout branch**:
   ```bash
   git checkout -b $ARGUMENTS
   ```

2. **Resolve and create spec directory**:
   ```bash
   # Source the bundled spec resolver from this pi package
   source "../../assets/scripts/spec-resolver.sh"

   # Resolve spec path (handles external vs local)
   RELATIVE_PATH="$(date +%Y)/$(date +%m)/$ARGUMENTS/000-backlog.md"
   SPEC_FILE=$(resolve_spec_path "$RELATIVE_PATH")
   SPEC_DIR="${SPEC_FILE%/*}"  # Pure bash dirname equivalent

   # Create backlog file
   touch "$SPEC_FILE"
   ```
   - Path: Auto-resolved based on .env configuration
     - External: `.specs/specs/<YYYY>/<MM>/<branch-name>/`
     - Local: `specs/<YYYY>/<MM>/<branch-name>/`
   - Creates `000-backlog.md` (empty file)

3. **Commit spec directory**:
   ```bash
   # Extract NNN and title for commit_spec_changes
   # For backlog, use "000" and "backlog"
   commit_spec_changes "$SPEC_FILE" "CREATE" "000" "backlog"
   ```
   - **CRITICAL**: Must commit BEFORE creating worktree, otherwise spec files are lost

4. **Confirm**:
   ```
   - Branch: $ARGUMENTS
   - Spec dir: <resolved-path>
   - Backlog: 000-backlog.md (committed)
   ```

## Conditional Documentation

When configuring external specs repository or modifying spec path resolution, read:
- `../../assets/scripts/spec-resolver.sh`
- `../../assets/scripts/external-specs.sh`
- `../../assets/scripts/lib/config-loader.sh`