# Tdd Cycle Manager > Guides established workflows through the Red-Green-Refactor cycle of Test-Driven Development. Use when this capability is needed. - Skill: `tomevault-io/tdd-cycle-manager` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/tdd-cycle-manager` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/tdd-cycle-manager/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/tdd-cycle-manager --- # TDD Cycle Manager This skill helps maintain the discipline of the TDD cycle. ## The Cycle ### 1. 🔴 RED (Write a failing test) - Focus on the *behavior* you want to implement. - Write a minimal test that fails (compile error or assertion failure). - **Goal**: Confirm the test fails for the right reason. ### 2. 🟢 GREEN (Make it pass) - Write the *minimal* amount of code to make the test pass. - Don't worry about aesthetics or performance yet. - **Goal**: Get to a passing state as quickly as possible. ### 3. 🔵 REFACTOR (Clean up) - Improve the code without changing its behavior. - Use the tests as a safety net. - **Goal**: Enhance readability, remove duplication, and optimize. ## Usage Use the provided `scripts/check_phase.py` to analyze your current test results and determine your next step. --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/jcorpac) — claim your Tome and manage your conversions.