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langgraph-fundamentals

by langchain-ai/langchain-skills

INVOKE THIS SKILL when writing ANY LangGraph code. Covers StateGraph, state schemas, nodes, edges, Command, Send, invoke, streaming, and error handling.

Skill content

- StateGraph: Main class for building stateful graphs

- Nodes: Functions that perform work and update state

- Edges: Define execution order (static or conditional)

- START/END: Special nodes marking entry and exit points

- State with Reducers: Control how state updates are merged

Graphs must be compile()d before execution.

Designing a LangGraph application

Follow these 5 steps when building a new graph:
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