Skill Builder for Claude Code (github.com)

Anthropic skill "Skill Builder" is a meta-skill for Claude Code that creates, edits and converts other Claude Code skills—essentially a skill that teaches Claude how to build skills. Built by Ken Collins on Anthropic’s Agent Skills architecture, it’s distributed as a CLI-first, production-oriented template you install locally (git clone to ~/.claude/skills/skill-builder) and invoke with natural prompts like “Help me create a skill for deploying AWS Lambda functions.” It automatically references Anthropic docs, asks clarifying questions, and generates well-structured skills with invocation-optimized descriptions, YAML frontmatter, progressive disclosure, validation checklists and runnable examples. This matters because it standardizes best practices for building system-wide, reusable skills (not just project-scoped agents), speeding developer workflows and improving invocation reliability. Key technical choices: Node.js v24+ with ESM (no Python), CLI tooling (gh, aws, npm, jq), gerund-form naming, intention-revealing filenames, and removal of agent-specific fields when converting sub-agents to skills. The repo includes SKILL.md, conversion guides, and templates (900+ lines of curated guidance) and is MIT-licensed and customizable, so teams can fork it to match different clouds, languages, or toolchains—lowering friction for production-grade Claude Code skill development.