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# Change subscription

> Change the plan or quantity of a subscription now, on the next bill date or at renewal. Input schema, a tools/call example and an example result.

Source: https://cotlet.dev/docs/mcp/recurly/change_subscription

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)

Change the plan or quantity of a subscription now, on the next bill date or at renewal.

Recurly MCP tools: https://cotlet.dev/docs/mcp/recurly.md

MCP tool: `recurly_write → change_subscription`

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

Changes the plan or the quantity of one subscription. With timeframe now the change applies at once, an invoice is created and, with automatic collection, a payment is attempted right away. With bill_date or renewal it applies later with no proration. Only one pending change is kept, and a new one replaces it. Existing add-ons are removed unless you list them in add_ons. Changes bill or credit the customer. By default you confirm each call; you can switch that off for this tool.

## Parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `subscription_id` | string | yes | Subscription UUID from list_subscriptions. |
| `plan_code` | string | no | New plan code. Omit to keep the plan. |
| `quantity` | integer | no | New quantity. Omit to keep it. |
| `timeframe` | enum | no | now, bill_date or renewal. Default: now. |
| `proration` | enum | no | For immediate changes: prorated, full or none. Default: the site setting. |
| `add_ons` | array | no | Add-on codes that should exist after the change. Add-ons you leave out are removed. |

## tools/call

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "recurly_write",
    "arguments": {
      "operation": "change_subscription",
      "arguments": {
        "subscription_id": "subscription_8c41d2"
      }
    }
  }
}
```

## Example response

```json
{
  "content": [
    {
      "type": "text",
      "text": "{ ... same JSON as structuredContent ... }"
    }
  ],
  "structuredContent": {
    "subscription_id": "44f83d0cbf86d2b8a5b3d3e6c3e8b16f",
    "account_code": "bright-lab",
    "plan_code": "starter",
    "state": "active",
    "timeframe": "renewal",
    "effective_at": "2026-11-02T00:00:00Z",
    "status": "pending"
  },
  "isError": false
}
```

Previous: [List transactions](https://cotlet.dev/docs/mcp/recurly/list_transactions.md)
Next: [Cancel subscription](https://cotlet.dev/docs/mcp/recurly/cancel_subscription.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.