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LangGraph reference

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Welcome to the LangGraph reference docs!

These pages detail the core interfaces you will use when building with LangGraph. Each section covers a different part of the ecosystem.

langgraph

The core APIs for the LangGraph open source library.

  • Graphs: Main graph abstraction and usage.
  • Functional API: Functional programming interface for graphs.
  • Pregel: Pregel-inspired computation model.
  • Checkpointing: Saving and restoring graph state.
  • Storage: Storage backends and options.
  • Caching: Caching mechanisms for performance.
  • Types: Type definitions for graph components.
  • Runtime: Runtime configuration and options.
  • Config: Configuration options.
  • Errors: Error types and handling.
  • Constants: Global constants.
  • Channels: Message passing and channels.

Model Context Protocol (MCP) support

To use MCP tools in your LangGraph application, check out langchain-mcp-adapters.

Prebuilt components

Higher-level abstractions for common workflows, agents, and other patterns.

  • Agents: Built-in agent patterns.
  • Supervisor: Orchestration and delegation.
  • Swarm: Multi-agent collaboration.