Mailchimp MCP Server

Instructions

Implementation Reference

• mcp_mailchimp/server.py:164-194 (handler)

  The update_campaign tool is defined using @mcp.tool() and handles patching campaign settings via the Mailchimp API.

  @mcp.tool()
  async def update_campaign(
      campaign_id: str,
      subject_line: str = "",
      from_name: str = "",
      reply_to: str = "",
      title: str = "",
      preview_text: str = "",
  ) -> str:
      """Update campaign settings. Only provide fields you want to change."""
      mc = get_client()
      settings: dict[str, str] = {}
      if subject_line:
          settings["subject_line"] = subject_line
      if from_name:
          settings["from_name"] = from_name
      if reply_to:
          settings["reply_to"] = reply_to
      if title:
          settings["title"] = title
      if preview_text:
          settings["preview_text"] = preview_text
      if not settings:
          return "No fields provided to update."
      c = await mc.patch(f"/campaigns/{campaign_id}", json={"settings": settings})
      return _fmt({
          "id": c["id"],
          "status": c.get("status", ""),
          "updated_fields": list(settings.keys()),
          "message": "Campaign updated.",
      })