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14.8The Architect's Checklist
When you inherit an agentic system to test, work the surfaces in this order:
- Contracts first -- snapshot MCP tool schemas and A2A agent cards; wire drift detection into CI. Cheapest tests, catch the most common breakage.
- Sandbox second -- no meaningful agent testing happens until side effects are contained.
- Replay third -- turn every production incident trace into a deterministic regression test.
- pass^k fourth -- establish the reliability baseline before anyone promises an SLA.
- Guardrails last but forever -- adversarial tests grow with every new tool the agent gains.