What is a Policy Diff?

Security policies should never change without review. A single-character change in a YAML policy can be the difference between blocking and allowing access to a sensitive tool. A modified regex pattern might broaden or narrow the scope of a rule in ways that aren't obvious from reading the new version alone. The diff — the precise delta between the old and new versions — is what reviewers need to evaluate the impact of a change.

Policy diffs serve multiple purposes. During code review, they let reviewers focus on what changed rather than re-reading the entire policy file. During incident investigation, they help determine whether a recent policy change caused the issue. During compliance audits, they provide evidence of what changed, when, and who approved it.

Because YAML policies for AI agent enforcement are declarative, diffs are particularly readable. A reviewer can see that a new rule was added to block a specific tool, or that a condition was modified to include an additional argument pattern. This readability is a major advantage of policy-as-code over UI-based policy management, where changes are often opaque.

Intercept policies are YAML files stored in git, making standard git diff the primary tool for policy comparison. Pull request workflows on GitHub, GitLab, or Bitbucket automatically display policy diffs for review. Teams can enhance this with custom CI checks that annotate diffs with the impact of changes — for example, highlighting when a rule's scope has been broadened or when a deny rule has been modified. Because YAML is human-readable, policy diffs are accessible to security reviewers who may not be software engineers.