Implementer

Execute feature tasks one by one with live documentation and context updates.

Triggers

• "Execute FEAT-XXX tasks"
• "Start implementing FEAT-XXX"
• "Work on FEAT-XXX"
• "Continue FEAT-XXX"
• "Resume FEAT-XXX"
• "Next task for FEAT-XXX"

Prerequisites

• Feature folder exists with completed:
  • spec.md
  • analysis.md
  • design.md
  • tasks.md
  • context/ folder with templates
• Git branch created for feature
• If missing: guide user to complete previous phases

Purpose

1. Find next uncompleted task in tasks.md
2. Execute task (write code, create files, etc.)
3. Update documentation in real-time
4. Update context (session_log, decisions, blockers)
5. Commit after each task
6. Repeat until all tasks done or blocker hit

Process

1. Read Context

# Read tasks
cat docs/features/FEAT-XXX/tasks.md

# Read design for reference
cat docs/features/FEAT-XXX/design.md

# Read spec for requirements
cat docs/features/FEAT-XXX/spec.md

# Check current status
cat docs/features/FEAT-XXX/status.md

# Read last session log entries
tail -30 docs/features/FEAT-XXX/context/session_log.md

# Check for active blockers
cat docs/features/FEAT-XXX/context/blockers.md

# Verify git branch
git branch --show-current

2. Verify Branch

If on main/master: -> STOP and say: "Create feature branch first: git checkout -b feature/XXX-name"

If on correct feature branch: -> Continue with implementation

3. Find Next Task

Scan tasks.md for first task that is:

• [ ] Pending, OR
• [in progress] In Progress (resume)

Skip tasks that are:

• [x] Complete
• [skipped] Skipped
• [blocked] Blocked

4. Execute Task Loop

For each task:

A. BEFORE starting:

1. Update tasks.md: [ ] -> [in progress]
2. Announce: "Starting task: [task description]"

B. DURING execution:

1. Write code / create files
2. Follow design.md specifications
3. If unclear -> ask user, don't assume
4. If blocked -> mark [blocked], log to blockers.md, move to next
5. If decision needed -> log to decisions.md

C. AFTER completing:

1. Update tasks.md: [in progress] -> [x]
2. Update progress table in tasks.md
3. Commit: git add . && git commit -m "FEAT-XXX: [task]"
4. Announce: "Task complete. Progress: X/Y tasks"

D. CHECKPOINT (every 30 min or 3 tasks):

1. Update status.md with progress
2. Update context/session_log.md
3. git push origin [branch]
4. Summary of progress

5. Commit Format

git add [specific files for this task]
git commit -m "FEAT-XXX: [Task description]"

Examples:

FEAT-001: Create User model
FEAT-001: Add user validation schemas
FEAT-001: Implement UserService CRUD methods
FEAT-001: Add POST /users endpoint
FEAT-001: Add unit tests for UserService

6. Completion

When all tasks done:

FEAT-XXX implementation complete!

Summary:
- Total tasks: X
- Completed: X
- Skipped: X
- Blocked: X

Next steps:
1. Push: git push -u origin feature/XXX-name
2. Create PR: /git pr
3. After merge: /wrap-up FEAT-XXX