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LangChain and LangGraph
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LangChain reference
API reference (v0.3)
LangGraph reference
Overview
Graphs
Functional API
Pregel
Checkpointers
Storage
Caching
Types
Runtime
Config
Errors
Constants
Channels
Prebuilt reference
Agents
Supervisor
Swarm
MCP
Error troubleshooting
Overview
GRAPH_RECURSION_LIMIT
INVALID_CHAT_HISTORY
INVALID_CONCURRENT_GRAPH_UPDATE
INVALID_GRAPH_NODE_RETURN_VALUE
MULTIPLE_SUBGRAPHS
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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.
Checkpointers
: 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.
API reference (v0.3)
Graphs
Assistant
Responses are generated using AI and may contain mistakes.