Send an email to recipients
gmail:send-email
{ "type": "object", "properties": { "raw": { "type": "string", "description": "Base64url-encoded RFC 2822 email message" }, "end_user_id": { "type": "string", "description": "End-user ID for per-user OAuth token resolution" } }, "required": [ "raw" ], "description": "Input schema for the gmail:send-email tool." }