list_merge_fields
Retrieve merge fields defined for a Mailchimp audience to discover available tags and field details before adding or updating members.
Instructions
List merge fields (custom data fields) defined for an audience, including tags, types, and defaults.
Use to discover available merge fields and their tag names before adding or updating members. Default fields (FNAME, LNAME, ADDRESS, PHONE) are always present. Use create_merge_field to add custom fields. Merge field tags are used in add_member/update_member merge_fields objects and in email content as |TAG| merge tags.
Authenticated via API key. Subject to Mailchimp API rate limits (max 10 concurrent requests). Read-only, safe to retry.
Args: list_id: The Mailchimp audience/list ID (e.g. 'abc123def4'). Obtain from list_audiences. count: Number of merge fields to return (1-1000, default 50). offset: Pagination offset. Use when total_items exceeds count.
Returns: JSON with total_items and merge_fields array. Each field: merge_id (int, use with update_merge_field/delete_merge_field), tag (string, e.g. 'FNAME'), name (display name), type ('text', 'number', 'date', etc.), required (boolean), default_value, options (choices for dropdown/radio types).
Example: list_merge_fields(list_id="abc123") -> {"total_items": 6, "merge_fields": [{"merge_id": 1, "tag": "FNAME", "name": "First Name", "type": "text", ...}]}
Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| list_id | Yes | ||
| count | No | ||
| offset | No |
Output Schema
| Name | Required | Description | Default |
|---|---|---|---|
| result | Yes |