---
title: "SubagentServerToolOpenRouter"
---

OpenRouter built-in server tool: delegates self-contained tasks to a smaller, cheaper, faster worker model (any OpenRouter model) mid-generation and returns its outcome. The worker may run as a sub-agent with its own tools.


## Fields

| Field                                                                                            | Type                                                                                             | Required                                                                                         | Description                                                                                      | Example                                                                                          |
| ------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------ |
| `parameters`                                                                                     | [Optional[components.SubagentServerToolConfig]](../components/subagentservertoolconfig.mdx)       | :heavy_minus_sign:                                                                               | Configuration for the openrouter:subagent server tool.                                           | \{<br/>"model": "~anthropic/claude-haiku-latest"<br/>}                                            |
| `type`                                                                                           | [components.SubagentServerToolOpenRouterType](../components/subagentservertoolopenroutertype.mdx) | :heavy_check_mark:                                                                               | N/A                                                                                              |                                                                                                  |