Agent frameworks
Open source
LangGraph
LangGraph is a library for agents that follow a graph of steps, with pauses and retries. It comes from the LangChain team.
- agents
- workflows
- Python
Open sourcelangchain.com
Multi-agent orchestration and agent SDKs
Code for orchestration and agent SDKs: LangGraph, CrewAI, the OpenAI Agents SDK, and the Claude Agent SDK.
4 tools · How to build a business agent system
Agent frameworks
Open sourceCrewAI
CrewAI lets you define agents with roles and tasks that they work through together. The framework is open source, with a paid cloud for running crews.
- multi-agent
- Python
Open sourcecrewai.comAgent frameworks
Open sourceOpenAI Agents SDK
The OpenAI Agents SDK is a Python library for agents that call tools, hand work to other agents, and check results. It is open source.
- Python
- OpenAI
- tools
Open sourceopenai.github.ioAgent frameworks
Claude Agent SDK
The Claude Agent SDK is Claude Code's agent loop as a Python and TypeScript library, with tools, hooks, subagents, MCP, permissions, and sessions.
- agents
- Python
- MCP
Freedocs.claude.com