How do I install feature-flags-java?

Run `npx skills add https://github.com/PostHog/skills --skill feature-flags-java` in your terminal. You need to have run `npx skills init` once in your project first.

Which agent frameworks does feature-flags-java support?

feature-flags-java works with any agent framework supported by the Skills registry, including Claude Code, Cursor, GitHub Copilot, Cline, Codex, and Gemini CLI.

Is feature-flags-java free to use?

Yes. feature-flags-java is free to install and use. It is available from the open explainx.ai skill registry published by PostHog.

PostHogofficial

feature-flags-java▌

Name: feature-flags-java
Availability: InStock
Author: PostHog

PostHog/skills · updated Apr 10, 2026

$npx skills add https://github.com/PostHog/skills --skill feature-flags-java

summary

### PostHog Java Feature Flags

›Install the PostHog Java library and integrate flag checks directly into existing application logic using the provided documentation.
›Securely manage PostHog API keys using environment variables and prioritize server-side evaluation to prevent UI flickering.
›Utilize available PostHog MCP tools to programmatically create, list, and update feature flags directly from your development environment.

skill.md

PostHog feature flags for Java

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

Reference files

references/java.md - Java 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.