How does this skill handle multi-tenant security?

It implements a security-first 'Scope' pattern that threads authorization context through all queries and PubSub topics to prevent broken access control.

Does it provide help with file uploads?

Yes, it includes security best practices for validating file content types using magic bytes rather than trusting user-provided metadata.

What is the recommended way to load data asynchronously?

The skill guides users to use assign_async/3, allowing the page to mount instantly while data loads in the background without blocking the UI.

Why does this skill discourage database queries in mount/3?

The mount/3 function is called twice—once for the initial HTTP request and again for the WebSocket connection. Querying in mount results in duplicate database calls, which harms performance.

Can it help with real-time broadcast issues?

Yes, it provides specific guidance on scoping PubSub topics and handling stale socket states in Channel intercepts.

Phoenix Thinking

Name: Phoenix Thinking
Author: georgeguimaraes

bygeorgeguimaraes

•

API Development

Enforces advanced architectural patterns and performance optimizations for Elixir and Phoenix LiveView applications.

Phoenix Thinking is a specialized Claude Code skill that guides developers through high-performance Elixir development by enforcing industry-standard patterns and Phoenix core team insights. It primary focuses on the 'Iron Law' of avoiding database queries in mount/3 to prevent duplicate execution, while providing deep architectural guidance on multi-tenant security scopes, async data loading, and real-time PubSub communication. This skill is essential for building production-ready LiveView applications that are secure, scalable, and free from common lifecycle pitfalls.

Key Features

01Prevents data leaks through strictly scoped PubSub topics

02Enforces the 'No Database Queries in mount' rule for optimal performance

03Guides async data loading patterns using assign_async/3

04Provides expert solutions for LiveView termination and stale socket states

05Implements security-first scoping for multi-tenant data protection

0676 GitHub stars

Use Cases

01Debugging complex WebSocket and Channel communication issues

02Building high-performance Phoenix LiveView pages with real-time updates

03Implementing secure multi-tenant architectures in Elixir applications

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add georgeguimaraes/claude-code-elixir phoenix-thinking

For use in Claude.ai and ChatGPT

Download Skill