payload_too_large

The request body is larger than the limit (1 MiB for REST and /mcp).

Common causes

• A body over the limit, or a Content-Length header that announces one.

How to fix

Send a smaller body.

Response

{
  "type": "https://castra.mehmetozer.dev/problems/payload_too_large",
  "title": "…",
  "status": 413,
  "detail": "…"
}

detail says what exactly went wrong for this request.