W&B Weave

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Step 1: Get your W&B API key

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Step 2: Enable Broadcast in OpenRouter

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Step 3: Configure W&B Weave

• Api Key: Your W&B API key
• Entity: Your W&B username or team name
• Project: The project name where traces will be logged
• Base Url (optional): Default is https://trace.wandb.ai

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Step 4: Test and save

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Step 5: Send a test trace

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Custom Metadata

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Supported Metadata Keys

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Example

{
  "model": "openai/gpt-4o",
  "messages": [{ "role": "user", "content": "Write a poem about AI..." }],
  "user": "user_12345",
  "session_id": "session_abc",
  "trace": {
    "trace_name": "Creative Writing Agent",
    "prompt_template": "poem_v2",
    "experiment_name": "creative_benchmark",
    "dataset_version": "1.0.0"
  }
}

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Attributes and Inputs

• Attributes: Metadata about the call (user IDs, organization IDs, trace identifiers, custom metadata)
• Inputs: The actual request data including messages, model parameters (temperature, max_tokens, etc.)
• Summary: Token usage, costs, and timing metrics

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Additional Context

• The user field maps to user_id in attributes
• The session_id field maps to session_id in attributes
• Custom metadata keys from trace are merged into the call’s attributes
• Model parameters (temperature, max_tokens, top_p) are included in inputs for easy filtering

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