launch_test

MCP tool · send subject line split tests with tracking

launch_test randomly assigns recipients to subject line variants, sends the campaign through marginal's hosted delivery layer, and records a tracking token per message for opens and clicks. Returns an experiment_id for later analysis.

When to use it

• Running a subject line A/B or A/B/C test from an agent workflow
• Programmatic email experiments without wiring Mailchimp or Klaviyo APIs
• Cart recovery, launch promos, or lifecycle tests to a CSV-style recipient list

Example

{
  "variants": [
    { "variant_text": "Your cart is waiting" },
    { "variant_text": "Still thinking about it?" },
    { "variant_text": "20% off ends tonight" }
  ],
  "recipients": [
    { "email": "[email protected]", "name": "You" }
  ],
  "winner_criteria": "clicks",
  "destination_url": "https://yourstore.com/cart"
}

Response

Save experiment_id from the tool result, then call get_results after engagement accumulates.