> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter-d02e98a0-mintlify-5b6e02fd.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# McpCallItem - Python SDK

> McpCallItem method reference

<Warning>
  The Python SDK and docs are currently in beta.
  Report issues on [GitHub](https://github.com/OpenRouterTeam/python-sdk/issues).
</Warning>

An MCP tool call with its output or error

## Fields

| Field          | Type                                                                                       | Required             | Description |
| -------------- | ------------------------------------------------------------------------------------------ | -------------------- | ----------- |
| `arguments`    | *str*                                                                                      | :heavy\_check\_mark: | N/A         |
| `error`        | *OptionalNullable\[str]*                                                                   | :heavy\_minus\_sign: | N/A         |
| `id`           | *str*                                                                                      | :heavy\_check\_mark: | N/A         |
| `name`         | *str*                                                                                      | :heavy\_check\_mark: | N/A         |
| `output`       | *OptionalNullable\[str]*                                                                   | :heavy\_minus\_sign: | N/A         |
| `server_label` | *str*                                                                                      | :heavy\_check\_mark: | N/A         |
| `type`         | [components.McpCallItemType](/client-sdks/python/api-reference/components/mcpcallitemtype) | :heavy\_check\_mark: | N/A         |