Use when a class or method cannot be instantiated or exercised in a test because of its dependencies: heavy constructors, singletons, static calls, global state, or hidden side effects that make the code impossible to isolate. Use it to choose a specific dependency-breaking technique (Sprout Method, Wrap Method, Extract Interface, Parameterize Constructor, Subclass and Override Method, Break Out Method Object, and the full Feathers dependency-breaking catalogue), even when the technique is not named. Use it also when new behaviour must be added immediately alongside untested code without first bringing that surrounding code under test. For the overall approach to changing legacy code safely, including seam identification, characterization tests, effect sketching, and the five-step algorithm that calls these techniques at step three, use the sibling skill legacy-code-changes.
EnglishReview codebase conventions — a specific domain or all domains in parallel. Use when asked to review or check conventions.
English
AGENT SKILLS ATLASIncludes Legacy Dependency Breaking and Review Conventions.
Claude Code
Codex
Cursor
GitHub Copilot
Gemini CLISupported by the Atlas install prompt. Skill-specific requirements vary.
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What’s included
Legacy Dependency Breaking
Use when a class or method cannot be instantiated or exercised in a test because of its dependencies: heavy constructors, singletons, static calls, global state, or hidden side effects that make the code impossible to isolate. Use it to choose a specific dependency-breaking technique (Sprout Method, Wrap Method, Extract Interface, Parameterize Constructor, Subclass and Override Method, Break Out Method Object, and the full Feathers dependency-breaking catalogue), even when the technique is not named. Use it also when new behaviour must be added immediately alongside untested code without first bringing that surrounding code under test. For the overall approach to changing legacy code safely, including seam identification, characterization tests, effect sketching, and the five-step algorithm that calls these techniques at step three, use the sibling skill legacy-code-changes.
Review Conventions
Review codebase conventions — a specific domain or all domains in parallel. Use when asked to review or check conventions.
Quick start
- Choose your skills. Select individual skills above, or choose the entire pack.
- Copy the install prompt. Use Copy install prompt above the list.
- Send it to your agent. Paste into your coding agent’s chat. Your agent reviews the source and guides the setup.
Try it with your agent
After installation, start with a request like:
Use the Legacy Dependency Breaking skill to help with my task.
Ask me for the context you need before getting started.Requirements & license
- A coding agent that can access your project files and install skills.
- Your agent checks each skill’s instructions, dependencies, and permissions during setup.
- Reported license for the skills shown: MIT. The author’s terms apply.