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# Book appointment

> Book a client into an open time for an appointment type. Input schema, a tools/call example and an example result.

Source: https://cotlet.dev/docs/mcp/acuity-scheduling/book_appointment

Docs sections: [Get started](https://cotlet.dev/docs.md) · [REST API](https://cotlet.dev/docs/api.md) · [MCP](https://cotlet.dev/docs/mcp.md) · [SDKs & CLI](https://cotlet.dev/docs/sdks.md) · [Integrations](https://cotlet.dev/docs/integrations.md)

Book a client into an open time for an appointment type.

Acuity Scheduling MCP tools: https://cotlet.dev/docs/mcp/acuity-scheduling.md

MCP tool: `acuity_scheduling_write → book_appointment`

Access: write. Confirm: waits for the user's OK before it runs.

Creates an appointment for the client at the datetime you pass, for the appointment type and calendar. Pass a time returned by check_availability_times. The client needs a first and last name (Acuity requires both for a client profile). Returns the new appointment with its ID and confirmation link. By default you confirm each call; you can switch that off for this tool.

## Parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `appointment_type_id` | integer | yes | Appointment type ID from list_appointment_types. |
| `datetime` | string | yes | Start time from check_availability_times, e.g. '2026-11-03T10:00:00-0500'. |
| `first_name` | string | yes | Client first name. |
| `last_name` | string | yes | Client last name. |
| `email` | string | no | Client email. |
| `phone` | string | no | Client phone. |
| `calendar_id` | integer | no | Calendar ID from list_appointment_types or list_appointments. Without it, every calendar that offers the type is checked. |
| `timezone` | string | no | Long-form timezone ID, e.g. 'America/New_York'. |

## tools/call

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "acuity_scheduling_write",
    "arguments": {
      "operation": "book_appointment",
      "arguments": {
        "appointment_type_id": 5120043,
        "calendar_id": 27238,
        "datetime": "2026-11-03T10:00:00-0500",
        "first_name": "Dana",
        "last_name": "Reyes",
        "email": "dana@example.com"
      }
    }
  }
}
```

## Example response

```json
{
  "content": [
    {
      "type": "text",
      "text": "{ ... same JSON as structuredContent ... }"
    }
  ],
  "structuredContent": {
    "appointment_id": 1841502,
    "first_name": "Dana",
    "last_name": "Reyes",
    "email": "dana@example.com",
    "type": "Initial consult",
    "calendar": "Main",
    "datetime": "2026-11-03T10:00:00-0500",
    "duration": 60,
    "price": "90.00",
    "paid": "no",
    "confirmation_page": "https://acuityscheduling.com/schedule.php?owner=11111111&action=appt&id%5B%5D=def456"
  },
  "isError": false
}
```

Previous: [Check availability times](https://cotlet.dev/docs/mcp/acuity-scheduling/check_availability_times.md)
Next: [Reschedule appointment](https://cotlet.dev/docs/mcp/acuity-scheduling/reschedule_appointment.md)

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