Errors

{
  "error": "ValidationError",
  "message": "Request failed schema validation",
  "details": [...]
}

​

Status codes

​

400

• 400 response
• Invalid request (missing prompt, too many mentions or attachments, currentHtml too long).
• Mcp-Session-Id header missing.
• Missing or invalid request.
• Validation error
• sessionId query param missing.

​

401

• 401 response
• Not signed in.
• OAuth token missing or invalid.

​

403

• 403 response
• Attachments without a plan that includes them.
• Missing, invalid or expired token
• Session belongs to a different user.

​

404

• 404 response
• No active session for the given session ID.
• Not found
• Unknown client identifier.

​

409

• 409 response

​

410

• 410 response

​

413

• 413 response

​

415

• 415 response

​

422

• 422 response

​

429

• 429 response
• AI usage limit reached, or the plan has no AI.
• Rate limited

​

500

• 500 response

​

502

• 502 response

​

503

• Extension not yet built on this server.