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Phoenix has first-class support for LangGraph applications.
LangGraph is supported by our LangChain instrumentor. If you’ve already set up instrumentation with LangChain, you don’t need to complete the set up below

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Install

Install the OpenInference Langchain library before your application code. Our LangChainInstrumentor works for both standard LangChain applications and for LangGraph agents.

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Setup

Connect your application to Phoenix with the register function:

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Run LangGraph

By instrumenting LangGraph, spans will be created whenever an agent is invoked and will be sent to the Phoenix server for collection.

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Observe

Now that you have tracing setup, all invocations of chains will be streamed to your running Phoenix for observability and evaluation.

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Resources