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

# Use MCP App

> Call a server tool through an open MCP App.

## Parameters

**app\_id** `string` *required*

App instance ID from open\_mcp\_app in this conversation.

**tool\_name** `string` *required*

Exact server tool name.

**arguments** `object` *required*

Tool arguments matching its input schema.


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.