kassad

The README opens with

Kassad sits between your application and the language model. It runs every prompt, completion, tool call, and citation past a set of narrow, typed checks and hands your code an Allow / Flag / Review / Block verdict with the probability and confidence behind it. Your code decides what to do; Kassad never does.

The checks are answered by a System One decision model, TypeSafe's Jev by default: a model trained to return calibrated probabilities for typed questions instead of generating text. Every policy for a stage is batched into one request, so ten checks cost one round trip.