Claude Code Skills & Plugins — Agent Skills for Every Coding Tool 388 production ready Claude Code skills, plugins, and agent skills for 13 AI coding tools. The most comprehensive open source library of Claude Code skills and agent plugins — also works with OpenAI Codex, Gemini CLI, Cursor, and 9 more coding agents. Reusable expertise packages covering engineering, DevOps, marketing (incl. AEO — Answer Engine Optimization for LLM citation), security (PreToolUse hooks), compliance, C level advisory (incl. founder mode CFO/CMO/CRO/CPO/COO/CHRO/CISO/GC/CDO/CAIO/CCO/VPE personas + 21 /cs: slash commands), productivity (capture/email/reflect/weekly review/deep work/meetings), an academic research stack (litreview/grants/dossier/patent/syllabus/pulse/notebooklm/deep research + hybrid router), and enterprise Research Operations (clinical research/research finance/market research/product research, v2.9.0). Works with: Claude Code · OpenAI Codex · Gemini CLI · OpenClaw · Hermes Agent[^hermes] · Mistral Vibe[^vibe] · Cursor · Aider · Windsurf · Kilo Code · OpenCode · Augment · Antigravity [^hermes]: Hermes Agent is BYO sync tier : the repo ships a pre generated .hermes/skills/claude skills/ tree, but you run python scripts/sync hermes skills.py once locally to install into /.hermes/skills/ . Uses the same agentskills.io SKILL.md standard — no format conversion. [^vibe]: Mistral Vibe is also BYO sync tier : the repo ships a pre generated .vibe/skills/claude skills/ tree, run ./scripts/vibe install.sh once locally to install into /.vibe/skills/ . Same agentskills.io SKILL.md standard — no format conversion. Docs: . 5,200+ GitHub stars — the most comprehensive open source Claude Code skills & agent plugins library. What Are Claude Code Skills & Agent Plugins? Claude Code skills (also called agent skills or coding agent plugins) are modular instruction packages that give AI coding agents domain expertise they don't have out of the box. Each skill includes: SKILL.md — structured i