Subgraphs and Modular Agent Graph Composition (EXPLAINED)
TL;DR — Quick Answer
Subgraphs encapsulate reusable workflows (research, approval, RAG) with defined input/output state mapping — compose into parent graphs via add_node(subgraph) patterns, enabling modular testing and team ownership.
The Interview Question
When should you extract LangGraph subgraphs? Explain composition, state mapping, and reuse across products.
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