Unsupported media type

The MCP endpoint received an unsupported request content type.

Resolution

Send MCP JSON-RPC requests with Content-Type: application/json.

Response handling

Keep the response's request_id for diagnostics. Retry only transient 429 and 503 responses, using the rate-limit headers and exponential backoff with jitter. Correct 400, 401, and 403 requests before retrying.