openrouter-python-sdk-retry-errors/docs/components/chatfunctiontoolfunction.mdx

---
title: "ChatFunctionToolFunction"
---

## Fields

| Field                                                                                                                                                                                                                              | Type                                                                                                                                                                                                                               | Required                                                                                                                                                                                                                           | Description                                                                                                                                                                                                                        | Example                                                                                                                                                                                                                            |
| ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `cache_control`                                                                                                                                                                                                                    | [Optional[components.ChatContentCacheControl]](../components/chatcontentcachecontrol.mdx)                                                                                                                                           | :heavy_minus_sign:                                                                                                                                                                                                                 | Anthropic-style cache breakpoint for the content part. Interchangeable with the OpenAI-style `prompt_cache_breakpoint` marker: OpenRouter converts between the two based on the provider serving the request.                      | \{<br/>"ttl": "5m",<br/>"type": "ephemeral"<br/>}                                                                                                                                                                                   |
| `function`                                                                                                                                                                                                                         | [components.ChatFunctionToolFunctionFunction](../components/chatfunctiontoolfunctionfunction.mdx)                                                                                                                                   | :heavy_check_mark:                                                                                                                                                                                                                 | Function definition for tool calling                                                                                                                                                                                               | \{<br/>"description": "Get the current weather for a location",<br/>"name": "get_weather",<br/>"parameters": \{<br/>"properties": \{<br/>"location": \{<br/>"description": "City name",<br/>"type": "string"<br/>}<br/>},<br/>"required": [<br/>"location"<br/>],<br/>"type": "object"<br/>}<br/>} |
| `type`                                                                                                                                                                                                                             | [components.ChatFunctionToolType](../components/chatfunctiontooltype.mdx)                                                                                                                                                           | :heavy_check_mark:                                                                                                                                                                                                                 | N/A                                                                                                                                                                                                                                |                                                                                                                                                                                                                                    |