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

# Call MCP tool

> Invoke an approved integration tool with inputs mapped from workflow data.

Use **Call MCP tool** for a specific integration operation, such as looking up an order or submitting an approved change. The tool must be available through an approved [MCP connection](https://docs.livefaces.ai/console/tools.md).

## Configure

1. Choose the **Approved MCP tool**. Its definition supplies the input fields.
2. Map each required field from workflow inputs or earlier node outputs.
3. Pair a write action with [Confirm action](https://docs.livefaces.ai/workflows/nodes/confirm-action.md).
4. Connect every outcome, including uncertain results.

## Outcomes

| Outcome | Meaning |
| - | - |
| `success` | The tool reported a successful result. |
| `rejected` | The action was rejected. |
| `unknown` | The action's result is uncertain. |
| `error` / `timeout` | The call failed or exceeded its execution limit. |

Do not treat `unknown` as proof that nothing happened. Check the action's status or arrange review before trying a change again.

## Scenario: look up an order

A collection [Conversation](https://docs.livefaces.ai/workflows/nodes/conversation.md) has returned a confirmed `order_number`. Bind it to the order lookup tool's input. Connect `success` to a Conversation that explains the returned status and answers follow-up questions.

Send unsuccessful outcomes to an appropriate recovery message or support path. If the workflow later updates the order, add a separate confirmation paired with that write tool.


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