AI Engineering in Practice8 min read
FastAPI + LangGraph: production chatbot API pattern
How to wire LangGraph into a FastAPI chatbot API with streaming, persistence, and per-user threads. The production pattern that scales past demos.
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LangGraph
Explore our latest articles and insights about LangGraph.
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15 posts in total
LLM Engineering11 min read
Stateful agents with LangGraph: beyond linear chains
Why linear LangChain chains fall over on real agents and how LangGraph's stateful graphs replace them. The state model, loops, and upgrade path.
LLM Engineering11 min read
Sub-graphs in LangGraph for complex RAG queries
How to use sub-graphs in LangGraph to keep complex RAG pipelines sane. The composition pattern, the state isolation rule, and when to split.
LLM Engineering10 min read
Visualizing RAG pipelines with LangGraph StateGraph
How to render a RAG pipeline as a graph with LangGraph StateGraph. The diagram, the state schema, and the debugging workflow that saves hours.
LLM Engineering11 min read
Hybrid retrieval in RAG: vector + graph search
How hybrid retrieval combines vector search and graph traversal in RAG. The when, the why, and the 60-line fusion that beats either alone.
LLM Engineering12 min read
Agentic RAG with LangGraph: planning, rewriting, tool use
How agentic RAG uses LangGraph to plan, rewrite queries, and call tools. The graph, the state, and the nodes that turn single-pass RAG into reasoning.
LLM Engineering12 min read
Dynamic RAG: re-planning retrieval strategies mid-pipeline
How dynamic RAG re-plans retrieval mid-pipeline. The replanner prompt, the loop that recovers from bad chunks, and when this beats single-pass RAG.
AI Engineering in Practice12 min read
LangGraph persistence: thread models for production agents
Why production LangGraph agents need a postgres checkpointer and thread model. How persistence survives restarts, and the trap that loses every chat.
AI Engineering7 min read
Workflow orchestration with LangGraph
Learn how to build agentic workflows with LangGraph using nodes, edges, and shared state. Move from simple chains to cyclic state machines that can loop...
AI Engineering7 min read
Multi-hop RAG: when one retrieval isn't enough
Learn how to build multi-hop RAG agents that can decompose complex queries into sub-questions and chain multiple retrieval steps. Understand query decom...
AI Engineering8 min read
Assembling and running your thinking RAG agent
How assembling works in production. Learn how to wire up all the nodes in LangGraph to create a complete, self-correcting RAG agent. See it in action with
AI Engineering7 min read
Building a self-correcting RAG agent
Learn how to build the decision-making nodes for an intelligent RAG agent: routing, grading, and generation. Understand how self-correction loops make a...