8.5Key Takeaway

The five guardrails (Max Steps, Allowed Domains, Timeout, Token Budget, Action Allowlist) form a defense-in-depth system. Each catches a different failure mode. Together, they make agentic testing safe for CI/CD pipelines where an unconstrained agent could block deployments, consume expensive tokens, or interact with systems outside the test scope.

One more thing: guardrails are code, and code needs tests. As of July 2026, adversarially verifying that guardrails actually hold -- including against prompt injection arriving through tool outputs -- is a QA competency in its own right. See Testing Agentic Systems.