> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter-d02e98a0-mintlify-7021d5f4.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# FormatGrammar - Python SDK

> FormatGrammar 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 |
| ------------ | ---------------------------------------------------------------------------------------------- | -------------------- | ----------- |
| `definition` | *str*                                                                                          | :heavy\_check\_mark: | N/A         |
| `syntax`     | [components.Syntax](/client-sdks/python/api-reference/components/syntax)                       | :heavy\_check\_mark: | N/A         |
| `type`       | [components.FormatTypeGrammar](/client-sdks/python/api-reference/components/formattypegrammar) | :heavy\_check\_mark: | N/A         |