prompts.chat: 173K-star open prompt library with an MCP server
A public-domain prompt library accessible via CLI, MCP server, Claude Code plugin or CSV export, with a self-hostable private version.
A 173K-star GitHub repo gives you one of the largest AI prompt libraries completely free It's called prompts. chat, and it works with ChatGPT, Claude, Gemini and almost any other model. The project has reportedly even been referenced by Harvard and Columbia This is more than a website full of prompts. You can access the library through a CLI or MCP server, install it as a Claude Code plugin or export everything as CSV for your own scripts You can also self-host a private version with your own branding and login system, making it useful for teams and internal AI workflows The best part is the licensing. The prompts are released into the public domain, so you can copy, modify and use them in commercial projects without paying for access No subscriptions or locked prompt packs. Just an open-source library you can plug directly into your AI stack