Two-rule system prompt: no diagnostics, no discussing the underlying model

ctjlewis · x · 2026-09-30

ctjlewis highlights an AI app whose system prompt contains only two rules: it doesn't follow diagnostic or model-testing protocols, and it won't discuss which model powers the chat—a minimal setup that doubles as a defense against probing and injection attempts.

Related event: Mystery AI Site Refuses to Reveal Its Model With Two-Line System Prompt(2 posts)→

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