Anthropik published a fluency study in February — 9,830 Claude conversations, 11 observable collaboration behaviors scored across the population. I read it and immediately wanted to know which of those behaviors I'd never touched in months of daily Claude Code use.
The answer was uncomfortable. I was fast at prompting, but my session history showed I'd collapsed into three habits: clarifying scope, asking for code, reviewing output. The other eight behaviors on the index — things like delegating judgment calls, surfacing conflicting constraints, using Claude to stress-test my own assumptions — barely appeared.
skill-tree classifies your Claude Code or Cowork session history against all 11 behaviors from Anthropic's AI Fluency Index, then assigns one of seven archetype cards. The growth quest mechanic is the part I actually care about: it doesn't pick something you already do. It finds a behavior you've been avoiding and assigns it as a target for your next session.
That anti-local-optimum rule is deliberate. A system that tells you to keep doing what you're already good at just accelerates the same rut. The behavior taxonomy comes from Dakan & Feller's 4D AI Fluency Framework — Description, Discernment, Delegation, and Diligence (the fourth axis doesn't appear in chat logs, so it's not scored). The quest persists via a SessionStart hook so Claude surfaces it at the top of your next conversation before you've already defaulted to old patterns.
The 7-step orchestration (find session files, extract user messages, remote classifier, archetype assignment, narrative synthesis, render, return URL) runs in 30–60 seconds. The classifier runs on Fly.io using Claude Haiku; the resulting card renders as a tarot-style visualization with museum art, and you get a stable URL back. A live fixture is at skill-tree-ai.fly.dev/fixture/illuminator.
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.
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