name: implement
description: "Execute plan phases, writing code in spaces/ while tracking in ideas/. Use after creating a plan with /plan to implement work."
model: claude-sonnet-4-20250514
allowed-tools: Read, Write, Edit, Glob, Grep, Bash, Task

/implement

Execute implementation phases from PLAN.md, writing code in spaces/ while tracking progress in ideas/.

Usage

/implement yourbench YB-2 1.1      # Execute phase 1.1 of issue YB-2
/implement yourbench YB-2 --next   # Auto-find next uncompleted phase
/implement yourbench --next        # Auto-detect issue + next phase
/implement coordinatr 003 --full   # Execute all remaining phases

The Bridge Pattern

ideas/yourbench/issues/YB-2-auth/     spaces/yourbench/
├── TASK.md (requirements)            ├── src/
├── PLAN.md (phases)          ←→      │   └── auth/  ← CODE WRITTEN HERE
└── worklog/                          └── tests/
    ├── _state.json (current state)
    └── 001-phase-*.json (entries)

Prerequisites

REQUIRED:
- issues/###-name/PLAN.md must exist
- Active issue context (issue number specified or inferable)
- spaces/{project}/ exists (code repository)

If PLAN.md missing: Run /plan first to create implementation plan

Execution Flow

1. Parse & Validate

• Locate issue in ideas/[project]/issues/###-*/
• Verify spaces/[project]/ exists
• Check git branch (warn if on main/develop)
• Check dependencies (warn if incomplete)

2. Load Worklog Context

Read worklog/_state.json for:
- Current phase progress
- Key decisions made
- Previous agent context
- Blockers

3. Branch & Status Management

On first phase:
- Create feature branch: feature/###-slug or bugfix/###-slug
- Update issue status to in_progress
- Initialize worklog directory

4. Execute Phase

1. Load context:
2. PLAN.md (phases and checkboxes)
3. Spec section from implements: field in TASK.md
4. ADRs and research docs
5. Select agent based on phase domain
6. Write code to spaces/[project]/
7. Run tests and quality gates
8. Create worklog entry
9. Update PLAN.md checkboxes
10. Update _state.json

5. Agent Coordination

6. Per-Phase Security Checks (Conditional)

Trigger security-auditor after phase if touching:
- Authentication/Authorization
- Secrets/API keys
- Database operations
- File operations
- External APIs
- Deployment config

7. Worklog Entries (MANDATORY)

After each phase, create JSON entry:
- Filename: {sequence:03d}-phase-{slug}.json
- Required: type, phase, author, summary, work, learnings, next_steps, blockers

8. Final Review (--full mode)

When all phases complete:
1. Launch code-reviewer agent
2. Launch security-auditor agent
3. Process combined results
4. Block if CRITICAL issues

Modes

Specific Phase

/implement yourbench YB-2 1.1  # Execute only phase 1.1

Next Phase

/implement yourbench YB-2 --next  # Find first uncompleted checkbox

Full Run

/implement yourbench YB-2 --full  # All remaining phases + final review

Flags

Workflow

/spec → /issue → /plan → /implement → /commit → /complete
           ↓                 ↓
    implements:        Load spec section
    spec section       for requirements
                             ↓
                   worklog/ entries created
                             ↓
                   spaces/[project]/ code written

Spec Compliance

When implementing, the code should fulfill the requirements from the spec section referenced in the issue's implements: field. The /complete command will validate that all spec requirements are met.