> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter-d02e98a0-mintlify-5b6e02fd.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# ToolDefinitionJSON - Python SDK

> ToolDefinitionJSON method reference

<Warning>
  The Python SDK and docs are currently in beta.
  Report issues on [GitHub](https://github.com/OpenRouterTeam/python-sdk/issues).
</Warning>

## Fields

| Field      | Type                                                                                               | Required             | Description |
| ---------- | -------------------------------------------------------------------------------------------------- | -------------------- | ----------- |
| `type`     | *Literal\["function"]*                                                                             | :heavy\_check\_mark: | N/A         |
| `function` | [components.ToolDefinitionJSONFunction](/client-sdks/python/components/tooldefinitionjsonfunction) | :heavy\_check\_mark: | N/A         |