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I mapped where a prompt-injection guard's score breaks. It's not length.

This story is from 2026-10-20. It is preserved in the archive; the latest stories are on the live feed.

In my last post I scored Rebuff 0.1.1's heuristic layer on its own documented example (0.824, flags) and on the canonical short form (0.700, under its 0.75 default, so it never fires). A reader asked for a phrase-length-vs-score table to find where the boundary actually sits. I ran it. The answer i…

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  1. 2026-10-20 15:18 · DEV Community — Machine Learning
    I mapped where a prompt-injection guard's score breaks. It's not length.

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