List all audiences (lists) with subscriber counts and key stats.

List email campaigns, optionally filtered by status (save, paused, schedule, sending, sent).

Create a new email campaign. Returns the campaign ID for use with update_campaign_content and send/schedule. Returns compact confirmation by default — set verbose=true for full response.

Set the HTML content or template for a campaign. Provide either html OR template_id. Returns compact confirmation by default — set verbose=true for full response.

Schedule a campaign to send at a specific time. Returns compact confirmation by default — set verbose=true for full response.

Send a campaign immediately. The campaign must have content set first via update_campaign_content. Returns compact confirmation by default — set verbose=true for full response.

Get performance report for a sent campaign: opens, clicks, bounces, unsubscribes, and more.

List available email templates.

Search for audience members by name or email address across all audiences.

Add a new subscriber or update an existing one (upsert). Automatically computes the required subscriber hash from the email. Returns compact confirmation by default — set verbose=true for full response.

Search the Mailchimp Marketing API catalog to discover endpoints. Returns method, path, summary, and parameter details. Call with no arguments to see all available categories.

Execute any Mailchimp Marketing API call. Use the search tool first to discover available endpoints and their parameters. Write operations return compact summaries by default — set verbose=true for full response.