Blog
What the numbers say, and what they hide
Technical writing about building detectors. No announcements, and no post that does not contain a number we measured.
- Our regulated-advice detector scores 0.983. Its recall is 0.75.Both numbers are real, they measure different slices of the same test set, and the one we would have put on a slide is the one that matters least.
- Eight detectors was the wrong capThe memo that started this project capped v1 at eight detectors. The library ships 29, and the discipline the cap was protecting moved somewhere that holds better.
- Why the open-source layer of this category went unmaintainedThe acquisition and archive timeline, with sources, and what it means for anyone depending on a guardrail library today.
- Evaluating PII detection across 26 languagesA span either has the right type and both boundaries or it does not count. Scored that way, in every target language at once, including the two whose identifiers cannot be checksummed.