> ## 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.

# ToolCustom - Python SDK

> ToolCustom 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                                                                                                                                                                                                 | Example                 |
| --------------- | -------------------------------------------------------------------------------------------------------- | -------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------- |
| `cache_control` | [Optional\[components.AnthropicCacheControlDirective\]](../components/anthropiccachecontroldirective.md) | :heavy\_minus\_sign: | Enable automatic prompt caching. When set at the top level, the system automatically applies cache breakpoints to the last cacheable block in the request. Currently supported for Anthropic Claude models. | `{"type": "ephemeral"}` |
| `description`   | *Optional\[str]*                                                                                         | :heavy\_minus\_sign: | N/A                                                                                                                                                                                                         |                         |
| `input_schema`  | [components.InputSchema](/client-sdks/python/api-reference/components/inputschema)                       | :heavy\_check\_mark: | N/A                                                                                                                                                                                                         |                         |
| `name`          | *str*                                                                                                    | :heavy\_check\_mark: | N/A                                                                                                                                                                                                         |                         |
| `type`          | [Optional\[components.ToolTypeCustom\]](../components/tooltypecustom.md)                                 | :heavy\_minus\_sign: | N/A                                                                                                                                                                                                         |                         |