Kubernetes manifest validation before rollout

Kubernetes manifest validation should extend beyond YAML syntax to verify that rendered resources will be accepted by the intended cluster, including API compatibility, admission policies, defaults, and server-side field ownership. Coding agents should receive clearly scoped manifest paths, rendering commands, Kubernetes versions, namespaces, overlays, and policy sources, while limiting changes to the reported deployment issue rather than unrelated refactoring. The recommended process renders final manifests and submits them to a matching non-production control plane through server-side dry run, then uses server-side apply dry run to identify conflicts with fields managed by other controllers. Because these checks cannot establish runtime safety, they should be complemented by separate policy, image, and workload-testing gates. Pull requests should preserve reproducible evidence such as render commands, target versions, validation results, ownership conflicts, and rendered-object diffs, while humans retain authority over rollout timing, production credentials, and deployment scope.

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