Deliver one releasable increment from increments/<feature>.md — strict TDD by default (one test-lists/<feature>.md, unit tests). ATDD only when a real outer seam exists (API/UI/contract). One increment per invocation; RED before GREEN; all project verify steps green before done; commit then stop. Not for whole-feature planning (skills/new-feature).
$npx -y skills add dan-the-dev/xp-developer-skills --skill new-incrementInstalls into the current project.
Run `npx skills use "https://github.com/dan-the-dev/xp-developer-skills" --skill "dan-the-dev/xp-developer-skills/new-increment"` 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/dan-the-dev/xp-developer-skills" that are relevant to the current task. Run `npx skills add "https://github.com/dan-the-dev/xp-developer-skills"` and select the relevant skills, then follow their instructions.