Public response model. The secret below is fictional and is not a credential.

status: 500
body: reference Q-19; token demo-token-amber; file /lab/app/pay.py line 40

Worked public body, different reference:
status: 500
body: reference R-441; key club-demo-key-not-real; file /lab/app/pay.py line 12

Corrective rule: retain a safe message and reference in the public response. Omit or redact secrets from restricted diagnostics too.