Reference

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.
• Config: Configuration options.
• Errors: Error types and handling.
• Constants: Global constants.
• Channels: Message passing and channels.

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.
• MCP Adapters: Integrations with external systems.