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 extracted into formal logic rules the answer is checked against
Automated Reasoning checks extract the policy document into formal logic rules and a schema of variables. A fidelity report grounds each extracted rule back to the statement it came from, so a subject-matter expert can check it, and tests that mimic real questions refine it before deployment. Each claim in an answer then returns a finding: VALID, INVALID, SATISFIABLE, IMPOSSIBLE, TRANSLATION_AMBIGUOUS, TOO_COMPLEX or NO_TRANSLATIONS. The findings aggregate to the worst result, so the application has to handle ambiguity as a normal outcome. 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 blocks a subject rather than reasoning about it. A word filter matches exact terms where the rule is logical. An LLM-as-a-judge evaluation job runs offline over samples, so it measures rather than enforces at runtime.
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 extracted into formal logic rules and a schema of variables, checked against a fidelity report, then refined with tests before deployment. Each claim in an answer returns VALID, INVALID, SATISFIABLE, IMPOSSIBLE, TRANSLATION_AMBIGUOUS, TOO_COMPLEX or NO_TRANSLATIONS, and the findings aggregate to the worst result. 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. blocks subjects rather than reasoning 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. Two limits shape the design: validation runs on complete responses, with no streaming support, and English (US) is the only language supported.