Backend Feature Flags

Purpose

Design feature flag systems with lifecycle management, targeting, and risk controls.

Agent Protocol

Trigger

Exact user phrases: "feature flag", "feature toggle", "canary release", "gradual rollout", "A/B test", "kill switch", "flag management", "LaunchDarkly", "Unleash", "flag evaluation", "targeting rule", "percentage rollout", "feature gate".

Input Context

Before activating, verify:

• Number of flags expected (10s, 100s, 1000s)
• Targeting requirements (user ID, group, percentage, custom attributes)
• Flag lifespan (short-lived release toggles vs long-lived ops toggles)
• Evaluation performance needs (latency budget, cache TTL tolerance)
• Flag management platform (LaunchDarkly, Unleash, Flagsmith, custom)