Loops MCP by usefulapi

Send a transactional email

loops_send_transactional

Destructive

SENDS a real transactional email via a Loops template. This dispatches an actual email to the recipient. Loops API: POST /v1/transactional.

TableJSON Schema

Name	Required	Description
`email`	Yes	Recipient email address (required).
`attachments`	No	Optional attachments: array of { filename, contentType, data } objects.
`addToAudience`	No	Whether to add the recipient to your audience.
`dataVariables`	No	Template data variables (string/number) to interpolate into the template.
`transactionalId`	Yes	The Loops transactional template id (required).

Changes observed during successful MCP inspections.

Changed3 schema fields changedOct 9, 2026

changedInput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

removedInput schema / properties / dataVariables / additionalProperties / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "number"
-  }
-]

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