---
format: "aidr-story-markdown/v1"
id: "95656bee021c75eca09680b76d3ec430a559e695a049093acb847e6640e6caf7"
canonical_url: "https://aidr.today/95656bee?lang=en"
title: "Semantic diffing of formal policies with anti-unification"
lang: "en"
requested_lang: "en"
available_langs: ["en","vi"]
translation_fallback: null
fallback_fields: []
published_at: "2026-11-11T23:33:03.000Z"
category: "Research"
topics: ["amazon","reasoning"]
source_urls: ["https://aws.amazon.com/blogs/machine-learning/semantic-diffing-of-formal-policies-with-anti-unification/"]
summary: "A symbolic, deterministic semantic diff using an open-source anti-unification engine can show reviewers only the genuine disagreements between two candidate authorization policies, avoiding cosmetic changes that hide behavioral differences."
---

# Semantic diffing of formal policies with anti\-unification

> [Open the canonical story](<https://aidr.today/95656bee?lang=en>)

**Published:** 2026-11-11T23:33:03.000Z
**Category:** Research
**Topics:** amazon, reasoning

## Summary

A symbolic, deterministic semantic diff using an open\-source anti\-unification engine can show reviewers only the genuine disagreements between two candidate authorization policies, avoiding cosmetic changes that hide behavioral differences\.

## Sources

- [Story source](<https://aws.amazon.com/blogs/machine-learning/semantic-diffing-of-formal-policies-with-anti-unification/>)