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

# ServerToolOutputName

## Fields

| Field | Type | Required | Description | Example |
| - | - | - | - | - |
| `api_format` | [components.ServerToolOutputNameAPIFormat](../components/servertooloutputnameapiformat.mdx) | :heavy\_check\_mark: | N/A | |
| `name` | *Optional\[str]* | :heavy\_minus\_sign: | Anthropic Messages `server_tool_use` block `name`, when the call surfaces as one | web\_search |
| `type` | *str* | :heavy\_check\_mark: | Output item `type` on Responses, content block `type` on Anthropic Messages, `reasoning_details[].type` on Chat Completions | web\_search\_call |