Feature Flag Template

This template helps you implement feature flags (feature toggles) to enable controlled feature rollouts, A/B testing, and safe deployment practices. It covers flag management, targeting strategies, and monitoring.

Sample Prompt

Implement feature flags for a new checkout flow:
- Boolean flags for enabling/disabling the new checkout
- User targeting based on roles, regions, or percentage rollouts
- A/B testing infrastructure with experiment tracking
- Real-time flag updates without application deployment
- Analytics integration for measuring feature impact
- Cleanup strategy for removing obsolete flags

What This Template Covers

Flag types and strategies including boolean, multivariate, and percentage-based flags
User targeting with sophisticated segmentation and rollout controls
Real-time updates and flag management without code deployments
A/B testing integration with experiment design and statistical analysis
Monitoring and analytics for feature performance and user behavior
Flag lifecycle management including creation, testing, and cleanup procedures

Best Practices

Start with simple boolean flags before implementing complex targeting
Use descriptive flag names that clearly indicate the feature being controlled
Implement flag fallbacks to handle service outages gracefully
Monitor flag performance and impact on application metrics
Clean up obsolete flags regularly to avoid technical debt
Test flag configurations thoroughly in staging environments
Document flag purposes and expected behavior for team understanding
Use gradual rollouts to minimize risk when releasing new features

When to Use This Template

Implementing controlled feature rollouts and canary deployments
Setting up A/B testing and experimentation frameworks
Managing feature access for different user segments
Reducing deployment risk with feature toggles
Creating kill switches for quick feature disabling in emergencies

The Script

peep feature-flag