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May 1, 202612 min readPlatform

Feature Flag Control-Plane Consistency Models

How to classify flags by risk and assign consistency guarantees so kill switches are strong while experiments stay fast.

Not all flags deserve the same consistency guarantees. Over-constraining all flag reads increases latency and cost.

Consistency Tiers

  1. Safety flags: strongly consistent.
  2. Experiment flags: bounded staleness.
  3. Cosmetic flags: client-evaluated.
type FlagTier = "safety" | "experiment" | "cosmetic";

Correct consistency tiering is a major lever for both reliability and performance.

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