# AgentContext > The open-source AI Context & llms.txt Registry for Antigravity, Cursor, Claude Code, and modern AI developer environments. ## Site Overview AgentContext catalogs verified, token-efficient Markdown documentation endpoints (llms.txt), validated system prompts (.cursorrules), and Model Context Protocol (MCP) servers. ## Verified Stacks & Contexts - [Supabase Context](https://agentcontext.dev/supabase/): Official llms.txt, AI rules, troubleshooting, and MCP config. - [Stripe Context](https://agentcontext.dev/stripe/): Official llms.txt, AI rules, troubleshooting, and MCP config. - [Next.js 15 Context](https://agentcontext.dev/nextjs/): Official llms.txt, AI rules, troubleshooting, and MCP config. - [Tailwind CSS v4 Context](https://agentcontext.dev/tailwindcss/): Official llms.txt, AI rules, troubleshooting, and MCP config. - [Shadcn UI Context](https://agentcontext.dev/shadcn/): Official llms.txt, AI rules, troubleshooting, and MCP config. - [Playwright Context](https://agentcontext.dev/playwright/): Official llms.txt, AI rules, troubleshooting, and MCP config. - [Drizzle ORM Context](https://agentcontext.dev/drizzle/): Official llms.txt, AI rules, troubleshooting, and MCP config. - [Prisma ORM Context](https://agentcontext.dev/prisma/): Official llms.txt, AI rules, troubleshooting, and MCP config. - [Redis Context](https://agentcontext.dev/redis/): Official llms.txt, AI rules, troubleshooting, and MCP config. - [FastAPI Context](https://agentcontext.dev/fastapi/): Official llms.txt, AI rules, troubleshooting, and MCP config. - [Cloudflare Workers & R2 Context](https://agentcontext.dev/cloudflare/): Official llms.txt, AI rules, troubleshooting, and MCP config. - [Docker Context](https://agentcontext.dev/docker/): Official llms.txt, AI rules, troubleshooting, and MCP config. - [OpenAI API Context](https://agentcontext.dev/openai/): Official llms.txt, AI rules, troubleshooting, and MCP config. - [Anthropic Claude API Context](https://agentcontext.dev/anthropic/): Official llms.txt, AI rules, troubleshooting, and MCP config. - [Vercel AI SDK Context](https://agentcontext.dev/vercel-ai/): Official llms.txt, AI rules, troubleshooting, and MCP config. - [LangChain Context](https://agentcontext.dev/langchain/): Official llms.txt, AI rules, troubleshooting, and MCP config. - [Astro Context](https://agentcontext.dev/astro/): Official llms.txt, AI rules, troubleshooting, and MCP config. - [Hugging Face Context](https://agentcontext.dev/huggingface/): Official llms.txt, AI rules, troubleshooting, and MCP config. - [MongoDB Context](https://agentcontext.dev/mongodb/): Official llms.txt, AI rules, troubleshooting, and MCP config. - [Lemon Squeezy Context](https://agentcontext.dev/lemonsqueezy/): Official llms.txt, AI rules, troubleshooting, and MCP config. ## Specification References - [llmstxt.org Specification](https://llmstxt.org/): Jeremy Howard's proposal for agentic website consumption. - [Model Context Protocol](https://modelcontextprotocol.io/): Open standard for secure tool and database integration.