Add new behavior test-first (write failing test → make it pass → refactor). Use when asked to "add a test for", "implement X with tests", or extending a codebase that already has a test suite.
$npx -y skills add av/mi --skill tddInstalls into the current project.
Run `npx skills use "https://github.com/av/mi" --skill "av/mi/tdd"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.
Use the skills in "https://github.com/av/mi" that are relevant to the current task. Run `npx skills add "https://github.com/av/mi"` and select the relevant skills, then follow their instructions.