# Test Driven Development

> Enforces TDD RED-GREEN-REFACTOR cycle

- Skill: `galando/test-driven-development` (Agent Skill)
- Install (CLI): `npx skillmds@latest add galando/test-driven-development`
- Raw SKILL.md: https://api.skillmd.com/api/skills/galando/test-driven-development/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: galando (https://skillmd.com/u/galando)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/galando/test-driven-development

---


# TDD Skill

**RED:** Write failing test FIRST
**GREEN:** Minimal code to pass
**REFACTOR:** Improve while green

❌ Code before tests → DELETE

**For complete TDD methodology:** Read `${CLAUDE_PLUGIN_ROOT}/.claude-plugin/reference/skills-full/test-driven-development-full.md`