# Test Driven Development (agent skill)

> Test Driven Development is an agent skill (a SKILL.md file) from GanyuanRan/Aegis. Agents load it when the user explicitly requests strict or test-first TDD, or when the current conversation already contains an explicit TDD… It works with Claude Code, Codex, Gemini CLI, GitHub Copilot and OpenCode and has 1,322 GitHub stars across a repository of 2 listed skills.

Use when the user explicitly requests strict or test-first TDD, or when the current conversation already contains an explicit TDD Route: strict decision from another Aegis workflow. → False-positive entry on a native-direct-skill host? → Exit immediately unless the user explicitly asked for TDD or the conversation already contains TDD Route: strict. In off mode, do not start RED / GREEN / REFACTOR from generic bugfix, contract, shared-module, or risky-code wording alone.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/GanyuanRan/Aegis |
| Skill path | skills/test-driven-development/SKILL.md |
| Skill name | test-driven-development |
| GitHub stars | 1,322 |
| Installs on skills.sh | not listed |
| License | MIT |
| Skills in repo | 2 |
| Plugin marketplace | aegis-dev |
| Official | no |
| Works with | Claude Code, Codex, Gemini CLI, GitHub Copilot, OpenCode |
| Category | Testing & QA |
| Last commit | Oct 3, 2026 |

## When it triggers

- Use when the user explicitly requests strict or test-first TDD, or when the current conversation already contains an explicit TDD Route: strict decision from another Aegis workflow.

## Add this skill

### Claude Code

```sh
/plugin marketplace add GanyuanRan/Aegis
/plugin install aegis@aegis-dev
```

In the Claude apps, zip the skill folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).

### ChatGPT / Codex

```sh
git clone --depth 1 https://github.com/GanyuanRan/Aegis.git
cp -r Aegis/skills/test-driven-development .agents/skills/test-driven-development   # repo; ~/.agents/skills for all projects
```

### Cursor

```sh
git clone --depth 1 https://github.com/GanyuanRan/Aegis.git
cp -r Aegis/skills/test-driven-development .cursor/skills/test-driven-development   # project; ~/.cursor/skills for all projects
```

Sources (checked 2026-10-07): https://code.claude.com/docs/en/skills, https://support.claude.com/en/articles/12512180-using-skills-in-claude, https://learn.chatgpt.com/docs/build-skills, https://cursor.com/docs/context/skills

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Canonical page: https://appsgit.com/skills/ganyuanran-test-driven-development
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