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Test-driven development skill

Test-driven development is part of Superpowers, Jesse Vincent's development method. Its job is to write the failing test first for every feature and bug fix, then the code. It loads on its own when a request matches its description, and you can also call it by name.

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When the agent reaches for it

The agent keeps every installed skill's description in view and loads the full instructions when a request matches. This is the description it reads:

Use when implementing any feature or bugfix, before writing implementation code

What the instructions cover

The sections of its SKILL.md, in order.

  • Overview
  • When to Use
  • The Iron Law
  • Red-Green-Refactor
  • Good Tests
  • Common Rationalizations
  • Red Flags - STOP and Start Over
  • Example: Bug Fix
  • Verification Checklist
  • When Stuck
  • Debugging Integration
  • Final Rule

What ships with it

Besides SKILL.md, the folder carries these. The agent opens them only when a step in the instructions calls for one.

  • writing-good-tests.md 8 KB

Install the test-driven development skill

In Claude Code, run this in a session. It comes from the publisher's own instructions.

Claude Code 
/plugin install superpowers@claude-plugins-official

License: MIT.

In Longwave, add Superpowers from the marketplace. It installs all 14 of its skills, and your Claude Code, Codex and OpenCode threads can use them.

Questions people ask

How do I install the test-driven development skill?

In Claude Code, run /plugin install superpowers@claude-plugins-official. In Longwave, add Superpowers from the marketplace, and its skills reach your Claude Code, Codex and OpenCode threads.

When does the agent use the test-driven development skill?

When a request matches its description. The agent keeps only the name and description of each installed skill in view, and reads the full instructions when a task fits. You can also ask for it by name.

Use your skills in every harness.

Longwave installs a skill collection once, and your Claude Code, Codex and OpenCode threads can all use it.

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