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adding-feature-flags

Implement PostHog and environment-variable feature flags for staged rollouts.

672|104|Updated Apr 10, 2026
Search Tags:#feature flags#feature toggles#posthog#launchdarkly#gradual rollout#kill switch
One-click install
npx skills add https://github.com/spencerpauly/awesome-cursor-skills --skill adding-feature-flags
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: adding-feature-flags
Source: https://github.com/spencerpauly/awesome-cursor-skills/tree/main/resources/adding-feature-flags
Command: npx skills add https://github.com/spencerpauly/awesome-cursor-skills --skill adding-feature-flags

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Feature releases often need safer rollouts, experiments, and the ability to turn risky changes off quickly without a redeploy.

Core Features & Use Cases

  • PostHog feature flags for client-side and server-side evaluation.
  • Simple local flags driven by environment variables for lightweight projects.
  • Use cases: staged rollouts, A/B testing, kill switches, and feature cleanup after launch.

Quick Start

Use this skill to add feature flags to your app with PostHog or a simple local environment-variable setup.

Frequently Asked Questions about adding-feature-flags

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I implement feature flags for a gradual rollout?▼

Implement feature flags by integrating evaluation logic into client-side and server-side code to control gradual exposure. This approach enables staged rollouts by toggling features on for specific user segments without requiring a redeploy.

What is a kill switch and how do feature toggles enable it?▼

A kill switch is a feature toggle that instantly disables risky changes without redeploying. Feature toggles evaluate flag states at runtime, allowing you to immediately turn off malfunctioning features across your application components or API routes.

Can I use PostHog feature flags for both client-side and server-side evaluation?▼

Yes, PostHog feature flags support both client-side and server-side evaluation. You can apply PostHog client hooks for frontend components and perform server-side flag evaluation within your API routes to control feature rollout.

Do I need a platform like PostHog to add feature toggles, or can I use local environment variables?▼

You do not need a platform like PostHog; you can implement simple local flags driven by environment variables. This lightweight setup is ideal for smaller projects that still need feature toggles for application releases.

What is the best way to manage A/B testing and feature cleanup after launch?▼

The best way to manage A/B testing and post-launch feature cleanup is using feature flags. Flags allow you to run controlled experiments and easily remove obsolete code paths once the feature is fully rolled out to all users.

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