Implement Feature

Implements a feature from its specification using the Forja (Dev) agent.

When to Use This Skill

• A feature spec has been approved and is ready for implementation
• You need architecture design, code, and tests for a defined feature
• Translating product requirements into working software

What This Skill Does

1. Runs the SIGN IN checklist and verifies the spec handoff
2. Designs architecture (creates ADR if needed)
3. Defines interfaces/contracts, then implements in src/
4. Writes tests in tests/ (unit + integration)
5. Runs the Implementation Complete checklist (TIME OUT 1)
6. Runs the Pre-Delivery checklist (TIME OUT 2)
7. Prepares structured handoff to QA agent
8. Runs the SIGN OUT checklist

How to Use

Basic Usage

/implement-feature webhook-event-system

With Spec Reference

/implement-feature docs/specs/webhook-event-system.md

Example

User: /implement-feature user-authentication

Output:

• Implementation in src/ with all acceptance criteria met
• Tests in tests/ covering critical paths
• ADR if significant architecture decisions were made
• Handoff notes for QA: files changed, how to test, known limitations

Tips

• Ensure the feature spec exists before running this skill
• The agent creates an ADR for any significant architecture decisions
• Two TIME OUT checkpoints ensure both correctness and delivery cleanliness