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feature-flags-elixir

feature-flags-elixir

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Repository

About feature-flags-elixir

A skill for adding PostHog feature flags to Elixir applications. It provides implementation guidance, favors boolean and server-side evaluations, and can use connected PostHog MCP tools to manage flags.

Key features

  1. 01Elixir flag setup guidance
  2. 02Boolean flag checks by default
  3. 03Server-side evaluation guidance
  4. 04Environment variable configuration
  5. 05MCP-based flag management

Use cases

  1. 01Add feature flags to an Elixir app
  2. 02Choose server-side flag evaluation
  3. 03Manage flags through connected PostHog MCP tools

MCP support

When a PostHog MCP server is connected, the skill can use its tools to create, list, update, and delete feature flags in PostHog.

Install

Copy the command and run it in a terminal.

$npx skills add https://github.com/posthog/skills --skill feature-flags-elixir

After installing, type/feature-flags-elixirin Claude Code to confirm it loaded.

Bundled files

References and scripts installed along with SKILL.md.

references/
adding-feature-flag-code.md
best-practices.md
elixir.md

Details

From the project README

PostHog feature flags for Elixir

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

Reference files

  • references/elixir.md - Elixir 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.

Comments

Markdown supported