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A canary-string regression suite for prompt injection

Prompt injection is the kind of bug that comes back. You fix a system prompt, swap a model, tweak a retrieval step, and an attack that failed last month works again. The cheap defense is the same one we use for normal code: a regression suite that runs on every change. Here is a simple way to build…

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  1. 2026-11-12 14:14 · DEV Community — AI
    A canary-string regression suite for prompt injection

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