Elixir Expert

This is comprehensive coverage of Elixir development, from language fundamentals through OTP primitives and Phoenix framework patterns. You get working examples of GenServers, supervisors, Ecto queries, and LiveView implementations that show real concurrent system design. The code samples are production-grade, covering things like dynamic query building, proper error handling with pattern matching, and supervision trees. If you're building fault-tolerant systems or real-time Phoenix apps, this gives you the reference implementations and OTP patterns you actually need. The focus on concurrency primitives and supervisor strategies is especially solid for anyone moving beyond Rails-style CRUD into proper distributed systems.

skills.sh installs: 192
GitHub stars: 44
last updated: Aug 21, 2026

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Install

$ npx -y skills add personamanagmentlayer/pcl --skill elixir-expert --agent claude-code

Installs into .claude/skills of the current project.

Files

Elixir Expert

Expert guidance for Elixir programming, Phoenix framework, OTP, and building highly concurrent, fault-tolerant systems.

Core Concepts

Elixir Fundamentals

Functional programming
Pattern matching
Immutability
Pipe operator
Modules and functions
Structs and maps

OTP (Open Telecom Platform)

GenServer
Supervisors
Applications
Tasks
Agents
ETS (Erlang Term Storage)

Phoenix Framework

Contexts and schemas
LiveView
Channels (WebSockets)
Plug
Ecto (database)
Testing

Elixir Basics

# Pattern matching
{:ok, result} = {:ok, 42}
[head | tail] = [1, 2, 3, 4]

# Functions
defmodule Math do
  def add(a, b), do: a + b

  def factorial(0), do: 1
  def factorial(n) when n > 0, do: n * factorial(n - 1)
end

# Pipe operator
"hello"
|> String.upcase()
|> String.reverse()
# "OLLEH"

# Anonymous functions
add = fn a, b -> a + b end
add.(1, 2)  # 3

# Capture operator
add = &(&1 + &2)
Enum.map([1, 2, 3], &(&1 * 2))

# Structs
defmodule User do
  defstruct [:id, :name, :email, age: 0]
end

user = %User{id: "123", name: "John", email: "john@example.com"}

# Pattern matching with structs
%User{name: name} = user

SKILL.md on GitHub