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A validation gate turns deployment expectations into a repeatable decision. It defines evidence required before a candidate model can be promoted, such as data integrity, performance against a baseline, slice behavior, calibration, latency, resource use, safety checks and rollback readiness. The gate should be tied to the model's use and consequences rather than copied from a generic checklist. Thresholds need context. A minimum metric may be meaningful only when the evaluation sample is representative and confidence intervals are narrow enough for the decision. Slice-level results can reveal harm hidden by an overall average, but tiny slices produce uncertain estimates. Define minimum sample requirements or treat results as inconclusive. Choose metrics before examining outcomes to reduce the temptation to select whichever threshold the candidate happens to pass. Compare with the currently deployed model and relevant simple baselines. A gate can include technical checks such as schema compatibility, model artifact signature, successful loading, latency under expected load, error rates and resource limits. It can include human review for high-impact outputs and documented ownership for monitoring. A model that passes offline metrics may still fail under live traffic due to distribution shift, user adaptation or integration bugs. Staged rollout, canary analysis and rollback criteria manage remaining uncertainty. Automated checks should produce a reviewable report with data version, model digest, metric definitions, slice counts and pass/fail reasons. Some decisions should allow an explicit, documented exception path for inconclusive evidence or a justified tradeoff, rather than silently weakening thresholds. Validation gates do not certify a model as universally safe or fair. They provide evidence for a defined context and release decision. Revisit them when intended use, population, model architecture or regulatory obligations change, and monitor after launch because predeployment evidence has a limited time horizon.