Anthropics February 2026 AI Fluency Index studied 9,830 Claude conversations and classified them across 11 observable collaboration behaviors — things like how often users delegate open-ended tasks versus hand-holding each step, or whether they push back on Claude's first answer at all.
I read the study and immediately wanted to know where my own sessions landed. Not in aggregate intuition, but actually classified against the same taxonomy.
So I built skill-tree: it reads your Claude Code or Cowork session history, runs the same 11-behavior classification against Anthropic's baseline population, assigns one of seven archetype cards rendered as tarot cards with museum art, and picks one behavior you haven't touched as a growth quest for your next session.
The output is a stable URL — hosted on Fly.io — so you can share or revisit it. Here's what the archetype card looks like for the Illuminator type: skill-tree-ai.fly.dev/fixture/illuminator
The behavior taxonomy comes from Dakan & Feller's 4D AI Fluency Framework (Description, Discernment, Delegation, and Diligence — the fourth isn't classifiable from chat logs alone). The classifier runs as Claude Haiku on Fly.io and takes 30–60 seconds end-to-end across 7 steps: find session files, extract user messages, classify, assign archetype, synthesize narrative, render, return URL.
The growth quest persists across sessions via a SessionStart hook. Claude Code stores state at ~/.skill-tree/; Cowork uses $CLAUDE_PLUGIN_ROOT/.user-state/ because its $HOME is ephemeral.
Install in Claude Code:
claude plugin marketplace add robertnowell/ai-fluency-skill-cards
claude plugin install skill-tree-ai@ai-fluency-skill-cards
Also available as an MCP server (npm: skill-tree-ai) for Cursor, VS Code, and Windsurf.
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