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GitHub Repos for AI Agents

Big open-source repos you can plug into Claude Code, Codex or Cursor, each with what it does, how to use it and the loadout it fits.

Open-source algorithms

Code that shows how a platform ranks content, so your agent can plan around it.

xai-org/x-algorithm33,800+ stars

X Algorithm

The code behind the For You feed on X, published by xAI.

MCP servers and skills

Plug-ins that give Claude Code, Codex and Cursor new tools and know-how.

modelcontextprotocol/servers91,500+ stars

MCP Servers

The official reference servers for the Model Context Protocol.

anthropics/skills183,900+ stars

Anthropic Agent Skills

Public repo of Agent Skills: folders of instructions and scripts an agent loads when needed.

github/github-mcp-server33,900+ stars

GitHub MCP Server

GitHub's official MCP server for issues, pull requests and repos.

microsoft/playwright-mcp38,900+ stars

Playwright MCP

Microsoft's MCP server that lets an agent drive a real browser.

openfilm/openfilm3,600+ stars

OpenFilm

An open-source skill that lets your coding agent make videos you can then edit by hand.

microsoft/TokenEconomizer3,400+ stars

TokenEconomizer

A plugin that makes Claude Code, Codex and Copilot CLI cheaper to run in repos you use often.

heydamir/unslop4,000+ stars

unslop

A Claude Code and Codex skill that turns AI-looking UI into a designed interface.

haydenschmitty/floorplan2,000+ stars

Floorplan

A Claude Code and Codex plugin that draws a plain-English map of the app you built, plus a health check.

Open-source coding agents

Terminal agents you can read, run and extend yourself.

openai/codex131,000+ stars

OpenAI Codex CLI

OpenAI's open-source coding agent that runs in your terminal.

google-gemini/gemini-cli108,500+ stars

Gemini CLI

Google's open-source agent that brings Gemini into your terminal.

Agent frameworks

Libraries for building your own agents and browser automations.

browser-use/browser-use119,200+ stars

Browser Use

Open-source Python library for AI agents that use a web browser.

langchain-ai/langgraph43,900+ stars

LangGraph

LangChain framework for long-running, stateful agents.

crewAIInc/crewAI60,100+ stars

CrewAI

Python framework for teams of role-playing AI agents.

vercel-labs/agent-desktop3,000+ stars

agent-desktop

Lets your AI agent see and click desktop apps through the accessibility tree instead of screenshots.

Local model tools

Run open models on your own machine and point your agent at them.

ollama/ollama184,800+ stars

Ollama

Run open models like Qwen, DeepSeek, gpt-oss and Gemma on your own machine.

ggml-org/llama.cpp132,400+ stars

llama.cpp

The C/C++ engine for running LLMs locally on almost any hardware.

FAQ

What GitHub repos can AI agents use?

MCP servers and skills add tools to Claude Code, Codex and Cursor. Agent frameworks like LangGraph and CrewAI help you build your own. Local model tools like Ollama let agents run on your hardware.

Is the X algorithm on GitHub?

Yes. xai-org/x-algorithm has the For You ranking code, including the scoring weights in home-mixer/params/param.rs.

How do you pick these repos?

By GitHub stars and recent activity, and whether an agent can actually use them. Numbers come from the GitHub API on the date shown.