---
title: "McpCallItem"
---

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](../components/mcpcallitemtype.mdx) | :heavy_check_mark:                                             | N/A                                                            |