Feature Flags

Overview

Feature flags (also called feature toggles or feature gates) enable runtime control over feature availability without code deployments. They support gradual rollouts, A/B testing, user targeting, emergency kill switches, ML model switching, and infrastructure configuration. This skill covers implementation patterns, best practices, integration with LaunchDarkly/Unleash, and flag lifecycle management.

Agents

• senior-software-engineer - Feature flag strategy, architecture decisions, rollout planning
• software-engineer - Implements feature flags, integrations, and flag evaluation logic
• security-engineer - Feature flag security, access controls, audit logging
• senior-infrastructure-engineer - Feature flag infrastructure, distributed systems, caching strategies

Key Concepts

Flag Types

Boolean Flags - Simple on/off toggles: