Screaming-Stop Goal Hijacking in User Input (PromptInject) - ATR-2026-00507 (18503317-ca17-563a-816a-879835fb652b)
Detects the PromptInject 'screaming-stop' attack: an uppercase urgent imperative ('STOP EVERYTHING', 'HALT NOW') followed by a print/say/output directive with a rogue string. High-urgency framing designed to override agent behavior by simulating an emergency stop signal. Distinct from the 'ignore-print' variant in that it uses urgency framing (STOP EVERYTHING + NOW) rather than instruction cancellation. Generalised from PromptInject corpus (cluster size: 15 base instances) - hardcoded rogue strings replaced with generic output-verb + quoted-string pattern; exclamation count made flexible (1+ per marker); also covers lowercase variants.