Complete Claude Code plugin development system. PROACTIVELY activate when users want to: (1) Create/build/make plugins, (2) Add/create skills/commands/agents, (3) Package existing code as plugins, (4) Publish to marketplace, (5) Validate plugin structure, (6) Get plugin development guidance, (7) Export skills for claude.ai web app.
Install
npx skills add JosiahSiegel/claude-plugin-marketplace --skill plugin-masternpx skills add JosiahSiegel/claude-plugin-marketplace --skill plugin-master -a claude-code -gnpx skills add JosiahSiegel/claude-plugin-marketplace --skill plugin-master -a codex -ggemini skills install https://github.com/JosiahSiegel/claude-plugin-marketplace.git --path plugins/plugin-master/skills/plugin-mastergh skill install JosiahSiegel/claude-plugin-marketplace plugin-mastergit clone --depth 1 https://github.com/JosiahSiegel/claude-plugin-marketplace /tmp/JosiahSiegel__claude-plugin-marketplace
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/JosiahSiegel__claude-plugin-marketplace/plugins/plugin-master/skills/plugin-master ~/.claude/skills/plugin-master # Claude Code
cp -R /tmp/JosiahSiegel__claude-plugin-marketplace/plugins/plugin-master/skills/plugin-master ~/.agents/skills/plugin-master # Codex, Cursor, Gemini CLI, Copilot, OpenCode