invalid_identity

The MCP as argument is not a valid identity.

Common causes

• On the local stdio server, roles were given without as.userId.

How to fix

Pass "anonymous" or { "userId": "..." }.

Response

{
  "type": "https://castra.mehmetozer.dev/problems/invalid_identity",
  "title": "…",
  "status": 400,
  "detail": "…"
}

detail says what exactly went wrong for this request.