Exam-style
An insurance assistant answers eligibility questions from a published policy document. Compliance will not accept an answer that is merely supported by a retrieved passage: every eligibility statement has to provably follow from the rules written in that document. Which guardrail policy carries that requirement?
Reveal the answer
E. Automated Reasoning checks, with the policy document compiled into a formal logical model the answer is checked against
Automated Reasoning checks translate the policy document into a formal logical model, which a subject-matter expert reviews and corrects with test questions before it goes live. Each answer then comes back with a finding such as VALID, INVALID, SATISFIABLE, IMPOSSIBLE or TRANSLATION_AMBIGUOUS, so the application has to treat ambiguity as an outcome it handles rather than a rare error. The contextual grounding check measures whether a passage supports the claim, and a correctly quoted clause can still be applied to the wrong case. Denied topics refuses a subject rather than reasoning about it. A word filter is lexical where the rule is logical. An LLM-as-a-judge pass is offline, probabilistic measurement, not runtime enforcement.
Q. Every eligibility answer has to provably follow from the published policy. Which guardrail policy carries that, and why is grounding not enough?
A. Automated Reasoning checks. The policy document is compiled into a formal logical model, corrected with test questions before it goes live, and each answer returns a finding such as VALID, INVALID, SATISFIABLE, IMPOSSIBLE or TRANSLATION_AMBIGUOUS. The Contextual grounding checkA Guardrail check that tests an answer against the documents it was given and flags claims the source doesn’t support. check scores whether a retrieved passage supports the claim, which a correctly quoted clause can pass while being applied to the wrong case. Denied topicsSubjects you describe in plain language that a Bedrock Guardrail refuses to discuss, whichever way a user phrases the request. refuses subjects; it does not reason about them.
Why? Automated reasoning is the narrow tool for a bounded rule set someone has written down, which is what guardrails based on policy requirements means here. It is not a general-purpose hallucination check; that job belongs to grounding and to offline measurement.