Anthropology's AI Fluency Index study (February 2026) classified 11 observable collaboration behaviors across 9,830 Claude conversations and published the population baseline. I read it and immediately wanted to know: which of those 11 behaviors show up in my sessions, and which ones I've never once triggered in months of daily use.
So I built skill-tree: a tool that runs the same classification against your own Claude Code or Cowork session history, maps you against the population baseline, and picks one behavior you haven't tried as a growth quest for your next session.
The 11 behaviors come from Dakan & Feller's 4D AI Fluency Framework — Description, Discernment, Delegation, Diligence — though Diligence isn't observable in chat logs, so only three axes show up in your results. The classifier runs on Fly.io (Claude Haiku), takes 30–60 seconds end-to-end across 7 steps, and returns a stable URL. The output is one of seven archetype cards rendered as tarot cards with curated museum art. Live example at skill-tree-ai.fly.dev/fixture/illuminator.
The growth quest isn't cosmetic. It persists across sessions via a SessionStart hook, so Claude Code surfaces it at the start of your next session and you can decide whether to engage with it. State lives at ~/.skill-tree/ in Claude Code; 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 install skill-tree-ai) for Cursor, VS Code, and Windsurf, and as skill-tree-ai.zip for Cowork.
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