Ask Claude to Wrap New Features in Feature Flags for Safe Rollout

Deploying new features without a way to turn them off is risky. Feature flags let you ship code to production and enable it gradually — or disable it instantly if something goes wrong. Claude Code can add flag checks around any feature, following your existing patterns.

Wrap the new checkout flow in a feature flag called 'new-checkout'. 
When the flag is off, use the existing checkout. When it's on, use the new one. 
Follow the feature flag pattern we already use in the codebase.

Claude reads your existing feature flag setup (LaunchDarkly, Unleash, a custom config, or just an env variable) and adds the toggle:

// Claude wraps the feature, preserving both paths
if (featureFlags.isEnabled('new-checkout', { userId: user.id })) {
  return <NewCheckoutFlow cart={cart} />;
}
return <LegacyCheckoutFlow cart={cart} />;

If you don't have a feature flag system yet, Claude sets one up:

We don't have feature flags yet. Create a simple feature flag system 
using environment variables. Add flags for the three features we're 
about to ship: new-checkout, redesigned-dashboard, and bulk-export.

Target different flagging needs:

# Percentage rollout
Add a flag that enables the new search for 10% of users, 
with the percentage configurable via an env variable.

# User-segment flags
Flag the premium dashboard so it only shows for users 
with the 'enterprise' plan.

# Kill switch for a risky migration
Wrap the new payment processor integration in a flag. 
If the flag is off, fall back to the old processor. 
Include logging so we can see which processor handled each payment.

# Clean up old flags
Find all feature flags in the codebase that are set to 'always on'. 
Remove the flag checks and the old code paths — 
these features are fully launched and the flags are dead weight.

Feature flags are insurance for deployments — let Claude add the safety net so you ship with confidence and roll back without a redeploy.

via Claude Code