Skill-tree: finding the Claude Code habits you never touch

Anthropics February 2026 AI Fluency Index studied 9,830 Claude conversations and classified them across 11 observable behaviors and three axes: Description, Discernment, Delegation. I read it and immediately wanted to run the same classification on my own sessions — not to get a score, but to see which of the 11 behaviors I never touch at all. That gap is what skill-tree is built around. The growth quest doesn't pick a behavior you do occasionally and could do more. It picks the one you avoid en