Test Driven Development
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 1,386 GitHub stars across a repository of 2 listed skills.
github.com/GanyuanRan/Aegis/skills/test-driven-development (opens in a new tab)
Data as of from the GitHub API; description from the skill's SKILL.md. Report an error
- Multi-skill repo
- Plugin marketplace
- Testing & QA
- Active
Add this skill
Claude
This repository is a Claude Code plugin marketplace. In Claude Code:
/plugin marketplace add GanyuanRan/Aegis
/plugin install aegis@aegis-devIn the Claude apps, zip the test-driven-development folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).
ChatGPT / Codex
Codex reads skills from .agents/skills/ in a repo or ~/.agents/skills/ for every project:
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 projectsStandalone skills also load in the ChatGPT desktop app.
Cursor
Cursor loads skills from .cursor/skills/ (or ~/.cursor/skills/) and also reads .claude/skills/:
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 projectsSource (checked Oct 7, 2026): code.claude.com/docs/en/skills (opens in a new tab), code.claude.com/docs/en/plugin-marketplaces (opens in a new tab), support.claude.com/en/articles/12512180-using-skills-in-claude (opens in a new tab), learn.chatgpt.com/docs/build-skills (opens in a new tab), cursor.com/docs/context/skills (opens in a new tab)
What this skill does
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.
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.
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How do I install the Test Driven Development skill?
In Claude Code, run /plugin marketplace add GanyuanRan/Aegis and then /plugin install aegis@aegis-dev. For Codex or Cursor, copy the test-driven-development folder into .agents/skills/ or .cursor/skills/.
Is the Test Driven Development skill free?
Yes. The repository is open source under the MIT license.
Is Test Driven Development maintained?
The repository's most recent commit was on Oct 25, 2026. Its latest release is v2.14.2. appsgit only lists skills from repositories with a commit in the last six months.