SendKit MCP

Let AI agents run your email marketing.

Connect Claude, ChatGPT, or any MCP client to SendKit. Agents can design on-brand newsletters, preview them, and schedule campaigns with your approval.

Get started Raw markdown

Brand-aware design

Agents read your theme, logo, header, and footer, then build newsletters with structured blocks that stay editable.

Preview before sending

Render drafts, check warnings and spam scores, and send tests before anything reaches your audience.

Human-approved scheduling

Scheduling requires explicit confirmation and returns recipient count and quota impact first.

Endpoint and authentication

SendKit exposes a stateless Streamable HTTP MCP server. Every request uses the public API key as the identifier and the secret key as the credential. Custom clients can send an HMAC X-Signature over the raw request body instead of X-Secret-Key.

https://send-kit.com/mcp
Authorization: Bearer pk_your_public_key
X-Secret-Key: sk_your_secret_key

Scopes

Scope	Allows
read	Brand, block schema, newsletters, analytics, segments, audience summary, templates, products, quota
draft	Create, update, preview, duplicate, and delete newsletters
send	Send test, schedule, and pause campaigns

Tools

Read

get_brand
get_block_schema
list_newsletters
get_newsletter
get_newsletter_analytics
list_segments
get_audience_summary
list_templates
get_template
list_products
get_quota
get_usage_guide

Draft

create_newsletter
update_newsletter
render_newsletter_preview
duplicate_newsletter
delete_newsletter

Send

send_test_newsletter
schedule_newsletter
pause_newsletter

Design with blocks

Blocks are the recommended design mode. SendKit renders them with your theme, logo, header, and footer, and the result stays editable in the visual editor.

Call get_brand and get_block_schema.
Create a draft with content.mode = "blocks".
Call render_newsletter_preview and review warnings.
Refine with update_newsletter.
Send a test, then call schedule_newsletter. The MCP client asks the user to confirm.

{
  "title": "Weekly update",
  "subject": "What's new this week",
  "content": {
    "mode": "blocks",
    "blocks": {
      "selectedBlocks": [
        { "id": "hero", "name": "Rich Text" },
        { "id": "cta", "name": "Button" }
      ],
      "blockContents": {
        "hero": { "body": "<h1>Hello {{first_name}}</h1>" },
        "cta": { "text": "Read more", "href": "https://example.com" }
      }
    }
  }
}

HTML fallback

HTML is supported for advanced layouts. HTML newsletters are not editable in the visual editor and must include an unsubscribe link.

{
  "title": "Launch announcement",
  "subject": "We launched",
  "content": {
    "mode": "html",
    "html": "<h1>We launched</h1><a href=\"{{unsubscribe_link}}\">Unsubscribe</a>"
  }
}

Scheduling safely

MCP clients ask the user to confirm through the client's elicitation UI before the server commits a schedule. The REST v1 endpoint uses the same action and requires an explicit confirm: true field. The response includes the recipient count and quota impact, so agents can show both before sending. Pausing also asks the user to confirm.

{
  "newsletterId": "newsletter-id",
  "scheduledAt": "2026-11-20T09:00:00.000Z",
  "segmentId": "optional-segment-id",
  "confirm": true
}

Agent discovery

Agents can find the documentation and server metadata at these stable URLs:

https://send-kit.com/docs/mcp
https://send-kit.com/docs/mcp.md
https://send-kit.com/llms.txt
https://send-kit.com/.well-known/mcp.json

Connected agents can also call get_usage_guide or read the sendkit://docs resource.