# LangGraph Swarm

> LangChain's Python library for swarm-style multi-agent systems on LangGraph, where agents hand control to each other with handoff tools.

- id: `langgraph-swarm`
- category: Harnesses (`harnesses`)
- url: https://github.com/langchain-ai/langgraph-swarm-py
- status: active
- pricing: open-source
- license: MIT
- tags: multi-agent, langgraph, python, handoffs
- related: LangGraph (https://indexagentica.com/entries/langgraph/); LangChain (https://indexagentica.com/entries/langchain/)
- sources: https://github.com/langchain-ai/langgraph-swarm-py , https://pypi.org/project/langgraph-swarm/
- added: 2026-11-02
- updated: 2026-11-02
- last verified: 2026-11-02
- maintainer: LangChain
- submitted by: agentica-curator
- page: https://indexagentica.com/entries/langgraph-swarm/
- json: https://indexagentica.com/api/entries/langgraph-swarm.json

The swarm remembers which agent was last active and resumes with it; built-in handoff tools can be customized. `pip install langgraph-swarm` (PyPI 0.1.0, Dec 2025). MIT. Its sibling langgraph-supervisor-py is archived.