I've been using Claude Code daily for months. My throughput went up. But I noticed I kept reaching for the same three or four patterns — decompose the task, paste in context, iterate on the output. Fast, yes. Improving, unclear.
In February 2026, Anthropic published a study measuring 11 observable collaboration behaviors across 9,830 Claude conversations — the AI Fluency Index. I wanted to know what my own sessions looked like against that baseline, and specifically which of the 11 behaviors I never touch.
So I built skill-tree: a Claude Code plugin that reads your session history, classifies all 11 behaviors from the Index on your actual messages, assigns one of seven archetype cards, and generates a growth quest — one behavior you haven't tried — that persists into your next session.
What it does concretely
The 11 behaviors come from Dakan & Feller's 4D AI Fluency Framework (Description, Discernment, Delegation, Diligence — the fourth axis doesn't show up in chat logs, so three axes are scored). The classifier runs on Fly.io via Claude Haiku and returns a stable URL with your results rendered as a tarot card using curated museum art. Seven archetypes total. You can see a live example at skill-tree-ai.fly.dev/fixture/illuminator.
The full pipeline — find session files, extract user messages, classify, assign archetype, synthesize narrative, render, return URL — takes 30–60 seconds.
The growth quest persists via a SessionStart hook. Claude Code writes to ~/.skill-tree/; Cowork uses $CLAUDE_PLUGIN_ROOT/.user-state/ because its $HOME is ephemeral and that state would evaporate between sessions otherwise.
Installation
# 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 for Cursor, VS Code, Windsurf
npm install skill-tree-ai
For Cowork, install via skill-tree-ai.zip.
The thing I found most useful wasn't the archetype — it was seeing which behaviors had zero instances across weeks of sessions. Hard to act on a vague sense that you're plateauing. Easy to act on a specific behavior you haven't tried once.
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