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# Cancel appointment

> Cancel an appointment, optionally marking a no-show. Input schema, a tools/call example and an example result.

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

Cancel an appointment, optionally marking a no-show.

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

MCP tool: `acuity_scheduling_write → cancel_appointment`

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

Cancels one appointment. A cancellation cannot be undone, but the appointment stays viewable. Pass a note to include it in the cancellation message, and mark_no_show to record that the client did not come. Acuity emails and texts the client unless send_notification is false. By default you confirm each call; you can switch that off for this tool.

## Parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `appointment_id` | integer | yes | Appointment ID from list_appointments. |
| `cancel_note` | string | no | Text included in the cancellation message to the client. |
| `mark_no_show` | boolean | no | true records a no-show. Default: false. |
| `send_notification` | boolean | no | false sends no email or text. Default: true. |

## tools/call

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "acuity_scheduling_write",
    "arguments": {
      "operation": "cancel_appointment",
      "arguments": {
        "appointment_id": 1
      }
    }
  }
}
```

## Example response

```json
{
  "content": [
    {
      "type": "text",
      "text": "{ ... same JSON as structuredContent ... }"
    }
  ],
  "structuredContent": {
    "appointment_id": 1840299,
    "first_name": "Marc",
    "last_name": "Dubois",
    "type": "Annual review",
    "datetime": "2026-11-05T14:00:00-0500",
    "canceled": true,
    "no_show": false,
    "notified_client": true
  },
  "isError": false
}
```

Previous: [Reschedule appointment](https://cotlet.dev/docs/mcp/acuity-scheduling/reschedule_appointment.md)
Next: [Update appointment](https://cotlet.dev/docs/mcp/acuity-scheduling/update_appointment.md)

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## For AI agents: sign your user up

Is your user asking you to sign them up for Cotlet? You can do it for them, no account or key needed.

1. Read the fields and their allowed values: GET https://cotlet.dev/api/v1/access-requests
2. Ask the user for each value: email, apps, what you will do with them. If they leave the password to you, generate a strong one and show it to them.
3. Show the user what you will send, then POST it as JSON to https://cotlet.dev/api/v1/access-requests.

One call creates the account and sends the access request; we email the user when access is granted.