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Documentation Index

Fetch the complete documentation index at: https://docs.trynexus.io/llms.txt

Use this file to discover all available pages before exploring further.

Nexus helps you trace AI execution in three ways:
  • Automatic tracing via a LangChain callback handler.
  • OpenAI Agents SDK tracing via NexusOpenAITracingProcessor.
  • Manual tracing via NexusClient spans in your own code.
You can log runs, connect parent and child operations, and inspect tree structures from stored traces.

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Start here

Quickstart

Install the package and send your first trace.

LangChain integration

Attach LangHandler to chains, tools, and agents.

OpenAI Agents SDK

Trace OpenAI agents with NexusOpenAITracingProcessor.

Configuration

Configure DB and trigger behavior for your environment.

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What Nexus captures

  • run_id, trace_id, parent_run_id, and user_id
  • event category (chain, llm, tool, agent, retriever, and more)
  • name metadata (for model, chain, tool, and agent nodes)
  • JSON payloads for input, output, and error
This structure lets you reconstruct execution trees after a run and debug both failed and successful paths.

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Choose your tracing path

I use LangChain

Plug in a callback and collect traces with minimal code changes.

I use OpenAI Agents SDK

Register a trace processor and capture every agent span automatically.

I need full control

Add spans exactly where your app does meaningful work.
Your Nexus API key (nexus_api_key) is available on the Nexus platform.