Does this replace static analysis tools like Credo?

It complements tools like Credo by not only flagging the issue but providing the actual refactored code and explaining the architectural logic behind the change.

Why does it flag structs with more than 32 fields?

In the Erlang VM, maps (and thus structs) with 32 or fewer fields use an efficient flat-map representation. Beyond 32, they switch to hash maps, which consume more memory and can impact performance.

Can it help with complex error handling in Elixir?

Yes, it identifies 'Complex else clauses in with' and suggests refactoring them into smaller, assertive functions that keep your success paths clean and readable.

How does this skill improve Elixir application security?

It specifically monitors for dynamic atom creation using user-provided strings, which can lead to Denial of Service (DoS) attacks since atoms are not garbage collected in the Erlang VM.

Elixir Anti-Pattern Refactoring

Name: Elixir Anti-Pattern Refactoring
Author: vinnie357

byvinnie357

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Developer Tools

Identifies common Elixir code smells and provides idiomatic refactoring suggestions to improve code quality, performance, and security.

This skill empowers Claude to act as a senior Elixir architect by scanning your codebase for anti-patterns such as complex 'else' clauses in 'with' statements, unsafe dynamic atom creation, and non-assertive pattern matching. By providing clear detection criteria and step-by-step refactoring examples, it helps developers transition from functional-but-flawed code to idiomatic, maintainable Elixir that follows the 'Let it Crash' philosophy and BEAM best practices. It is particularly useful during code reviews or when modernizing legacy Elixir projects.

Key Features

019 GitHub stars

02Simplifies complex 'with' statements by isolating error handling into discrete private functions

03Optimizes large structs (32+ fields) into nested structures for better memory efficiency

04Refactors 'Boolean Obsession' and 'Primitive Obsession' into expressive domain-specific types

05Detects unsafe dynamic atom creation to prevent memory leaks and security vulnerabilities

06Identifies non-assertive map access and pattern matching to ensure fail-fast behavior

Use Cases

01Conducting deep code reviews to ensure Elixir projects adhere to idiomatic industry standards

02Modernizing legacy Elixir codebases by applying current best practices and performance optimizations

03Onboarding developers by providing automated feedback on Elixir-specific architectural patterns

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add vinnie357/claude-skills anti-patterns

For use in Claude.ai and ChatGPT

Download Skill