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Phoenix provides seamless observability and tracing for NVIDIA NeMo Agent Toolkit workflows. This guide walks you through setting up telemetry to view traces in the Phoenix UI.

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Install

Install the Phoenix subpackage to enable tracing capabilities: 
uv pip install -e '.[phoenix]'

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Setup

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Step 1: Start the Phoenix Server

Run the following command to start Phoenix server locally: 
phoenix serve
Phoenix should now be accessible at http://0.0.0.0:6006.

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Step 2: Configure Your Workflow

Update your workflow configuration file to include the telemetry settings. Add the following to your workflow configuration: 
general:
  telemetry:
    tracing:
      phoenix:
        _type: phoenix
        endpoint: http://localhost:6006/v1/traces
        project: my_workflow_project
This setup enables tracing through Phoenix at http://localhost:6006/v1/traces, with traces grouped into your specified project.

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Run Your Workflow

From the root directory of the NeMo Agent toolkit library, install dependencies and run your workflow: 
# Install the workflow and plugins
uv pip install -e examples/observability/simple_calculator_observability/

# Run the workflow with Phoenix telemetry settings
nat run --config_file examples/observability/simple_calculator_observability/configs/config-phoenix.yml --input "What is 1*2?"
As the workflow runs, trace data will show up in Phoenix.

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Observe

Open your browser and navigate to http://0.0.0.0:6006 to view your workflow traces:
  • Locate your workflow traces under your project name in projects
  • Inspect execution details (latency, tokens, etc.) and run evaluations on your traces

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Resources

NVIDIA NeMo Agent Toolkit Documentation

NeMo Agent Toolkit Overview