Anthropics February 2026 study classified 11 observable collaboration behaviors across 9,830 Claude conversations. The researchers called it the AI Fluency Index. I wanted to run the same classification on my own session history — not to benchmark against other users, but to find out which of the 11 behaviors I never touched.
The result is skill-tree. It reads your Claude Code or Cowork session files, runs a remote classifier against the same 11-behavior taxonomy from Dakan and Feller's 4D AI Fluency Framework (three observable axes: Description, Discernment, Delegation — the fourth, Diligence, doesn't show up in chat logs), and assigns you one of seven archetype cards rendered as tarot cards with curated museum art.
The archetypes — Illuminator, Navigator, Alchemist, and four others — aren't just cosmetic. Each maps to a distinct behavioral cluster. The Illuminator front-loads context and over-explains; the Navigator iterates tightly and discards failed directions fast. Seeing which card you land on tells you something your git history doesn't: not what you shipped, but how you collaborated to get there. You can see a live rendered example at skill-tree-ai.fly.dev/fixture/illuminator.
