Feature Flags Flutter — Agent Skill by PostHog

From the author

PostHog feature flags for Flutter applications

— the description by PostHog

AutoGineer summary

Written by AutoGineer from the skill’s own files, not by the author

This skill provides guidance and best practices for implementing PostHog feature flags within Flutter applications. It covers the integration process, recommended coding patterns to minimize technical debt, and strategies for ensuring consistent user experiences across sessions. The skill emphasizes efficient flag management, including the use of environment variables for security and server-side evaluation to optimize performance and reduce UI flicker.

What it does

Provides instructions for integrating PostHog feature flags into Flutter projects.
Outlines best practices for flag naming and organization to maintain code clarity.
Offers guidance on using server-side evaluation to improve application performance.
Explains how to manage flag dependencies and user properties for consistent targeting.
Supports the use of PostHog MCP tools for direct flag management within the development environment.

When to use it

When you need to perform controlled feature rollouts or A/B testing in a Flutter app.
When you want to decouple feature releases from code deployments.
When you need to manage user-specific feature access or permissions dynamically.
When you are setting up a new Flutter project and want to incorporate experimentation capabilities.

Advantages

Reduces the risk of deploying new features by allowing instant toggling.
Improves application performance through local evaluation and efficient flag handling.
Enhances code maintainability by promoting clean, centralized flag management patterns.
Ensures consistent user experiences by leveraging proper identification and targeting strategies.

Usage examples

“How do I check if a feature flag is enabled in my Flutter app?”: The agent provides the code pattern for checking a boolean flag using the PostHog SDK, ensuring the check is integrated cleanly into your existing logic.
“What is the best way to name my feature flags?”: The agent suggests using descriptive, type-prefixed names like 'is_premium_user' or 'new-billing-experiment' to keep your dashboard organized and your code readable.

Install

Download the skill as a ZIP:
https://autogineer.com/agent-skills/posthog/feature-flags-flutter/download

Unzip it into the cross-client skills folder of your project:

mkdir -p .agents/skills && unzip feature-flags-flutter.zip -d .agents/skills

Documentation by PostHog

PostHog feature flags for Flutter

This skill helps you add PostHog feature flags to Flutter applications.

Reference files

references/flutter.md - Flutter feature flags installation - docs
references/adding-feature-flag-code.md - Adding feature flag code - docs
references/best-practices.md - Feature flag best practices - docs

Consult the documentation for API details and framework-specific patterns.

Key principles

Environment variables: Always use environment variables for PostHog keys. Never hardcode them.
Minimal changes: Add feature flag code alongside existing logic. Don't replace or restructure existing code.
Boolean flags first: Default to boolean flag checks unless the user specifically asks for multivariate flags.
Server-side when possible: Prefer server-side flag evaluation to avoid UI flicker.

PostHog MCP tools

Check if a PostHog MCP server is connected. If available, look for tools related to feature flag management (creating, listing, updating, deleting flags). Use these tools to manage flags directly in PostHog rather than requiring the user to do it manually in the dashboard.

Framework guidelines

No specific framework guidelines.

Files

ATTRIBUTION.mdAdded by AutoGineer963 B
LICENSELicence file added by AutoGineer1.0 KiB
SKILL.md1.3 KiB
references/adding-feature-flag-code.md108.7 KiB
references/best-practices.md7.9 KiB
references/flutter.md5.9 KiB

Requirements and compatibility

Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Kiro, OpenCode, Goose, Amp, Roo Code, JetBrains Junie, Factory Droid, Devin (ex-Windsurf), Mistral Vibe, OpenHands, Letta

“Works with” means the tool reads the open Agent Skills format; a skill written for one tool may use features others lack.

Needs: Needs an MCP server

Security

No issues found by our static scan· No issues found

A static scan is not a guarantee. Skills are third-party content: review a skill before you let an agent use it.

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