> ## Documentation Index
> Fetch the complete documentation index at: https://docs.auriko.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# hosted_tool_not_supported

> HTTP 400 — Model does not support the requested hosted tool on available providers.

## HTTP status

`400 invalid_request_error`

## Typical cause

You included a hosted tool (e.g., `web_search_preview`, `file_search`) that the selected model doesn't support.

## Resolution

Remove the hosted tool from the request, or switch to a model that supports it. Function tools (`type: "function"`) work with all models that support tool calling.