Add a subscriber
Adds one person to a list.
MCP tool campaign_monitor_write → add_subscriber
write Confirm
Returns the subscriber's state on the list. On a list with double opt-in the state is Unconfirmed until the person confirms. The list's own opt-in settings decide which email the new subscriber gets, so the call reaches that person. By default you confirm each call; you can switch that off for this tool.
Parameters
| Name | Type | Description |
|---|---|---|
| list_id string required | string | List ID from list_lists. |
| email string required | string | Email address of the new subscriber. |
| name string | string | Full name. |
| custom_fields object | object | Custom field values by field name, for example {"Frequency": "Weekly"}. |
tools/call
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/call",
"params": {
"name": "campaign_monitor_write",
"arguments": {
"operation": "add_subscriber",
"arguments": {
"list_id": "list_8c41d2",
"email": "jane@example.com"
}
}
}
}Example response
{
"content": [
{
"type": "text",
"text": "{ ... same JSON as structuredContent ... }"
}
],
"structuredContent": {
"email": "noor.haddad@example.com",
"list_id": "1c4e8a2b6d9f4073a5b1c8d2e6f30495",
"state": "Unconfirmed"
},
"isError": false
}