Developer Uses a Single Keyword to Detect When AI Loses Track of Instructions

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A developer has shared a simple technique to monitor AI consistency during long conversations: instructing the AI to begin every response with a chosen word, in this case 'RES'. If the word is missing from a reply, it signals that the AI may have drifted from earlier instructions, prompting a closer review. The method draws on a concept from cybersecurity called a canary token, which uses a hidden string to detect prompt injection attacks, though the developer's use is focused on catching natural model drift rather than malicious interference. The technique requires no tools or cost — just a single line added to custom instructions or a system prompt. The developer emphasizes it is a supplementary warning sign and does not replace careful human review of AI-generated responses.

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