action microsoft_add_message_attachment {
  label: "Add message attachment"
  description: "Attach a file to a draft message. Content is base64-encoded and limited to 3 MB; use it before sending the draft."
  provider: microsoft
  method: POST
  path: "/v1.0/me/messages/{message_id}/attachments"
  scopes: ["Mail.ReadWrite"]
  input: @json {
    {
      "type": "object",
      "required": ["message_id", "@odata.type", "name", "contentBytes"],
      "additionalProperties": false,
      "properties": {
        "message_id": { "type": "string", "description": "Draft message id." },
        "@odata.type": { "type": "string", "enum": ["#microsoft.graph.fileAttachment"], "description": "Always #microsoft.graph.fileAttachment." },
        "name": { "type": "string", "description": "Attachment file name." },
        "contentBytes": { "type": "string", "description": "Base64-encoded file content." },
        "contentType": { "type": "string", "description": "MIME type, e.g. text/plain." }
      }
    }
  }
  output: @json {
    {
      "type": "object",
      "additionalProperties": true,
      "properties": {
        "id": { "type": "string" },
        "name": { "type": "string" },
        "size": { "type": "integer" }
      }
    }
  }
}