Add contacts to a list
Add up to 500 contacts, or a whole segment, to a list.
MCP tool constant_contact_write → add_contacts_to_list
write Confirm
Adds contacts to a list in one call. Give contact_ids (up to 500) or segment_id, not both. The contacts then receive any email scheduled to that list, and a large add can move your account into a higher contact tier. 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 or create_list. |
| contact_ids array | array | Up to 500 contact IDs. Use this or segment_id. |
| segment_id integer | integer | Add every contact of this segment. Use this or contact_ids. |
tools/call
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/call",
"params": {
"name": "constant_contact_write",
"arguments": {
"operation": "add_contacts_to_list",
"arguments": {
"list_id": "9d2e4b7a-1c3f-4a58-b6e0-7f8a2c5d1e90",
"contact_ids": [
"c1a2b3d4-0001-4e5f-8a9b-1c2d3e4f5a01",
"c1a2b3d4-0002-4e5f-8a9b-1c2d3e4f5a02",
"c1a2b3d4-0003-4e5f-8a9b-1c2d3e4f5a03"
]
}
}
}
}Example response
{
"content": [
{
"type": "text",
"text": "{ ... same JSON as structuredContent ... }"
}
],
"structuredContent": {
"list_id": "9d2e4b7a-1c3f-4a58-b6e0-7f8a2c5d1e90",
"requested": 3,
"added": 3
},
"isError": false
}