PencilPlaybook is the UI Skills / Taste-Skill for Pencil.dev + Claude Code — a design playbook that gives Claude real perceptual psychology and senior-level guardrails so it stops producing averaged-out AI slop.

Claude Code skill for naming products, SaaS, and brands. Metaphor-driven naming that avoids AI slop.

Open-source Agent Skill that scores AI-sounding writing 0–100, edits it with your assistant.

AI made building cheap. It didn't make deciding cheap. Mycelium is a Claude Code harness that makes your agent run discovery and weigh evidence before it writes code. It earns the right to start. Built for software, courses, AI tools, and services.