Reusable SKILL.md capabilities that give your agent new expertise — installed into .claude/skills/ and friends.
.claude/skills/
Help user create a new skill - interview them about the task, verify assumptions, ask clarifying questions, then write the skill file
Create a new Claude Code skill with tests
# DoWhy — Causal Inference DoWhy answers the question every analyst actually wants answered: **"Does X cause Y, or is it just correlated?"** Correlation is everywhere. Causation requires structure —
How to properly create Claude Code skills - teaches global vs project-local, naming conventions, and proper file structure