Patterns · Vol. 14

Pattern

LangChain and LangGraph

Provide a comprehensive Python and TypeScript framework for building LLM-powered applications and agents, with LangChain as the broader application framework and LangGraph as the specific orchestration layer for multi-step agent workflows.

Classification — The dominant agent framework as of mid-2026 — broad ecosystem, complex feature surface.

Full entry

The complete treatment — problem, how it works, when to use it, sources, and examples — lives in the volume below.

Browse the full pattern index or the catalog.