16 October 2026

The official Claude Code plugin directory, maintained by Anthropic

A curated collection of Claude Code plugins. The /plugins folder holds Anthropic's internal plugins, and /external_plugins holds plugins from partners and the community.

• Install with /plugin install {nama}@claude-plugins-official, or browse via /plugin > Discover.
• Standard structure: .claude-plugin/plugin.json is required, plus optional .mcp.json, commands, agents, and skills.
• The README reminds users to make sure a plugin is trustworthy before installing it, since Anthropic does not control the MCP servers or files inside.

An agent skill library for scientific research

177 ready-to-use skills and more than 100 scientific databases for biology, chemistry, medicine, and drug discovery. Works with Cursor, Claude Code, Codex, Pi, and Antigravity.

• Follows the open Agent Skills standard, so it is not tied to a single agent.
• Described in the paper arXiv:2609.00065.
• Also includes K-Dense BYOK: an open source co-scientist that runs on the desktop with your own API key and a choice of 40+ models.

Makes coding agents talk and read fewer tokens

A skill and proxy for coding agents that cuts tokens with a terse, caveman-style way of speaking. The code stays intact.

• README example: a 63-token answer becomes 20 tokens with the same fix.
• The README reports 33.2% fewer input tokens across 54 Claude Code runs, with 18 of 18 answers correct.
• Requires Node.js 22.13+. Once installed, claude, Codex, Gemini CLI, and OpenCode also use caveman mode.