Mailchimp MCP Server

Instructions

Implementation Reference

• mcp_mailchimp/server.py:268-290 (handler)

  The set_campaign_content tool definition and implementation, registered with the FastMCP decorator. It takes a campaign_id and either HTML/plain text content or a template_id to update the campaign's content via a PUT request to the Mailchimp API.

  async def set_campaign_content(
      campaign_id: str,
      html: str = "",
      plain_text: str = "",
      template_id: int = 0,
  ) -> str:
      """Set campaign content. Provide html for custom content, or template_id to use a template."""
      mc = get_client()
      body: dict[str, Any] = {}
      if html:
          body["html"] = html
      if plain_text:
          body["plain_text"] = plain_text
      if template_id:
          body["template"] = {"id": template_id}
      if not body:
          return "Provide html, plain_text, or template_id."
      await mc.put(f"/campaigns/{campaign_id}/content", json=body)
      return _fmt({
          "campaign_id": campaign_id,
          "content_type": "template" if template_id else "custom_html",
          "message": "Campaign content set.",
      })