# Elixir Phoenix

> Build scalable web applications using Elixir Phoenix framework.

- Skill: `heldinhow/elixir-phoenix` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add heldinhow/elixir-phoenix`
- Raw SKILL.md: https://api.skillmd.com/api/skills/heldinhow/elixir-phoenix/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: Heldinhow (https://skillmd.com/u/heldinhow)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/heldinhow/elixir-phoenix

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# Elixir Phoenix

## Overview
Phoenix is a productive web framework for Elixir that builds on Erlang's strengths. This skill should be invoked when building scalable web applications that benefit from Elixir's concurrency model and Phoenix's real-time capabilities.

## Core Principles
- **Conventions**: Follow Phoenix conventions for structure
- **Context**: Use contexts to encapsulate business logic
- **LiveView**: Leverage LiveView for real-time features
- **Ecto**: Use Ecto for database interactions

## Preparation Checklist
- [ ] Install Elixir and Phoenix
- [ ] Design application structure
- [ ] Plan contexts and schemas
- [ ] Set up database

## Step-by-Step Process
1. **Install**: Run `mix phx.new`
2. **Generate**: Create resources with generators
3. **Context**: Build business logic contexts
4. **Views**: Create views and templates
5. **LiveView**: Add real-time with LiveView
6. **Deploy**: Configure for deployment

## Do's and Don'ts
- ✅ **Do** use contexts for business logic
- ✅ **Do** leverage LiveView for interactivity
- ✅ **Do** follow Phoenix conventions
- ❌ **Don't** put logic in views
- ❌ **Don't** skip Ecto for complex queries
- ❌ **Don't** ignore Phoenix documentation

## Anti-Patterns
- **Fat Controllers**: Putting logic in controllers
- **No Contexts**: Not using application contexts
- **Missing LiveView**: Not leveraging real-time
- **Skip Testing**: Not writing Elixir tests