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LangGraph
Graph-based agent orchestration — durable state, conditional routing, native HITL.
6 hours2 resources1 prereqs
LangChain's agent-focused framework. Agent = directed graph (nodes = function/LLM, edges = conditional routing). Central shared state.
Strengths:
- Durable execution — agent crash/pause/resume
- HITL primitive —
interrupt()waits for user input - Streaming first-class — partial state streams to UI
- Subgraph composition — modular complex agents
- LangSmith integration — observability built-in
Trade-off: opinionated API, steep learning curve. But the most mature framework for production multi-agents (as of 2025-2026).