14.9Key Takeaway

Testing agentic systems is classical test discipline aimed at new surfaces: contract tests for MCP tool schemas and A2A agent cards, deterministic replay of recorded traces for debuggability, hard sandboxing because the SUT can act, pass^k repeat-run evaluation because single runs prove nothing, and adversarial guardrail testing because tool outputs are an attack channel. As of July 2026 this is a hiring-checklist competency -- the QA architect who can say "here is my pass^k gate, here is my injection suite, here is my schema-drift CI job" is testing the systems everyone else is merely demoing.