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tdd

100 / 100 · Low risk

Fine to try.

By open-gsd/gsd-pi (GitHub) · coding · 1,366 stars · scanned at commit c0bc9c4

Test-driven development with red-green-refactor loops around vertical slices (tracer bullets), not horizontal layers. Use when asked to "use TDD", "write test-first", "red-green-refactor", "build this with tests", or when a feature has a clear observable contract. The discipline complement to the test/add-tests skills (the mechanics).

Works with any agent that supports SKILL.md skills.

What this skill can do

We found nothing in the files we read that matches our rules. That does not prove the skill is safe: see the limits of static scanning.

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'tdd' ] || [ -L ~/.agents/skills/'tdd' ]; then echo 'A skill folder named tdd already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/open-gsd/gsd-pi' "$d" && git -C "$d" checkout --quiet 'c0bc9c4e7e0a8581aeac3af397031dc3a63d012e' -- 'src/resources/skills/tdd' && mkdir -p ~/.agents/skills && cp -R "$d"/'src/resources/skills/tdd' ~/.agents/skills/'tdd' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'tdd' ~/.claude/skills/'tdd' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

Badge for your README

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