Automated summary
Provides expert guidance for writing idiomatic Elixir, designing OTP supervision trees, and building Phoenix LiveView and Ecto applications with concurrency and fault tolerance in mind.
Strengths
- Covers the core ecosystem: GenServer, Supervisor, Application, Phoenix contexts, Ecto changesets and distributed clustering.
- Enforces a structured approach: let-it-crash philosophy, pattern matching, process isolation and immutability.
- States concrete output expectations: Dialyzer specs, ExUnit tests with doctests, Benchee benchmarks and Telemetry instrumentation.
- Points to an implementation playbook when deeper worked examples are needed.
Limitations
- No Elixir, OTP or Phoenix version is specified, so it offers no release-specific guidance.
- The SKILL.md contains no code snippets and relies on an external `resources/implementation-playbook.md` file existing in the repo.
- The 'use this skill when' section is very generic, so it may trigger on trivial Elixir tasks.
Use it when refactoring Elixir code, designing an OTP supervision tree, or debugging concurrency and performance issues on the BEAM.
Avoid it for non-Elixir stacks or for basic syntax help that needs no architectural reasoning.
Security analysis
SafeThe skill contains only advisory text about Elixir best practices, OTP, Phoenix, and testing. It declares no allowed tools and does not instruct any file system, network, shell, or destructive operations. There is no code execution or exfiltration risk.
No concerns found
How this analysis is madeExamples
Refactor this Elixir module so each conversation owns its own process with isolated state, and add a supervision tree that only restarts the failing child. Here is the current GenServer implementation: ...Design an OTP application for a job queue using a DynamicSupervisor and Task, with back-pressure and graceful shutdown. Include Dialyzer specs, an ExUnit test with async: true, and Telemetry events.My Phoenix LiveView re-renders too often and BEAM CPU spikes under load. Help me profile it with :observer and :recon, then propose changes to the socket assigns and process structure.name: elixir-pro description: Write idiomatic Elixir code with OTP patterns, supervision trees, and Phoenix LiveView. Masters concurrency, fault tolerance, and distributed systems. Use PROACTIVELY for Elixir refactoring, OTP design, or complex BEAM optimizations. metadata: model: inherit
Use this skill when
- Working on elixir pro tasks or workflows
- Needing guidance, best practices, or checklists for elixir pro
Do not use this skill when
- The task is unrelated to elixir pro
- You need a different domain or tool outside this scope
Instructions
- Clarify goals, constraints, and required inputs.
- Apply relevant best practices and validate outcomes.
- Provide actionable steps and verification.
- If detailed examples are required, open
resources/implementation-playbook.md.
You are an Elixir expert specializing in concurrent, fault-tolerant, and distributed systems.
Focus Areas
- OTP patterns (GenServer, Supervisor, Application)
- Phoenix framework and LiveView real-time features
- Ecto for database interactions and changesets
- Pattern matching and guard clauses
- Concurrent programming with processes and Tasks
- Distributed systems with nodes and clustering
- Performance optimization on the BEAM VM
Approach
- Embrace "let it crash" philosophy with proper supervision
- Use pattern matching over conditional logic
- Design with processes for isolation and concurrency
- Leverage immutability for predictable state
- Test with ExUnit, focusing on property-based testing
- Profile with :observer and :recon for bottlenecks
Output
- Idiomatic Elixir following community style guide
- OTP applications with proper supervision trees
- Phoenix apps with contexts and clean boundaries
- ExUnit tests with doctests and async where possible
- Dialyzer specs for type safety
- Performance benchmarks with Benchee
- Telemetry instrumentation for observability
Follow Elixir conventions. Design for fault tolerance and horizontal scaling.
From the file to a first result
The download contains exactly the content displayed on this page. This copy may differ from the latest version in the source repository.
View the source and supporting filesThis download contains SKILL.md only. Any scripts, references, templates and dependencies are not included. Get the required files from the source, preserving their directory structure, before continuing.
1. Download the file
Download SKILL.mdFrom the root of a test project, save the file as .skill-downloads/elixir-pro-expert-mrwakc8n/SKILL.md, or use the command below. This folder is for inspecting the skill before installation.
Command for macOS/Linux or WSL: requires a POSIX shell and curl. On Windows without WSL, use the download button and create the folder manually.
mkdir -p '.skill-downloads/elixir-pro-expert-mrwakc8n' && curl --fail --show-error --location 'https://skills-guides.com/api/skills/elixir-pro-expert-mrwakc8n/download' --output '.skill-downloads/elixir-pro-expert-mrwakc8n/SKILL.md.part' && mv '.skill-downloads/elixir-pro-expert-mrwakc8n/SKILL.md.part' '.skill-downloads/elixir-pro-expert-mrwakc8n/SKILL.md'2. Check prerequisites
Read SKILL.md before using it. If it references scripts or external services, inspect them and prepare the required access in your test environment.
No recognized prerequisites section in this file. This does not mean it is self-contained: libraries, tools and access requirements may be mentioned elsewhere in the content or source repository.
The platforms on this page are catalog indications. The paths below follow tool documentation; they do not prove this skill has been run in those tools. No minimum tool version is confirmed for this listing.
3. Load the skill
After inspection, copy the complete folder into your project using one of the commands below, then open a new tool session. The command stops if a folder with the same name already exists: compare the files before replacing it.
Claude Code
test -f '.skill-downloads/elixir-pro-expert-mrwakc8n/SKILL.md' && test -s '.skill-downloads/elixir-pro-expert-mrwakc8n/SKILL.md' && mkdir -p '.claude/skills' && test ! -e '.claude/skills/elixir-pro' && cp -R '.skill-downloads/elixir-pro-expert-mrwakc8n' '.claude/skills/elixir-pro'Cursor
test -f '.skill-downloads/elixir-pro-expert-mrwakc8n/SKILL.md' && test -s '.skill-downloads/elixir-pro-expert-mrwakc8n/SKILL.md' && mkdir -p '.cursor/skills' && test ! -e '.cursor/skills/elixir-pro' && cp -R '.skill-downloads/elixir-pro-expert-mrwakc8n' '.cursor/skills/elixir-pro'Codex
test -f '.skill-downloads/elixir-pro-expert-mrwakc8n/SKILL.md' && test -s '.skill-downloads/elixir-pro-expert-mrwakc8n/SKILL.md' && mkdir -p '.agents/skills' && test ! -e '.agents/skills/elixir-pro' && cp -R '.skill-downloads/elixir-pro-expert-mrwakc8n' '.agents/skills/elixir-pro'OpenSkills
OpenSkills must already be installed. The local install/read procedure is checked with OpenSkills 1.5.0, which requires Node.js ≥ 20.6.0. Catalog slugs are not resolved automatically.
Official OpenSkills installationopenskills install './.skill-downloads/elixir-pro-expert-mrwakc8n'openskills read 'elixir-pro-expert-mrwakc8n'Reading should display the installed file content and its base directory. It does not run the skill or install its dependencies.
For an agent that reads AGENTS.md, then sync the index. This command changes AGENTS.md: review the diff before using it.
openskills syncManual method or another tool: attach SKILL.md to a conversation, or open it in an agent that can read files. Include any required supporting resources. No universal folder is recognized by every tool.
4. Try a first task
Use a short, synthetic input: an API endpoint, a small document or an interface brief. In a new conversation, attach the file or give the agent its path, then adapt this request:
Read .skill-downloads/elixir-pro-expert-mrwakc8n/SKILL.md and apply its instructions to this example: [describe a test input]. Identify any missing files, dependencies or access. Produce the result requested by the skill without inventing data or running unreviewed scripts.Expected result: output matching the skill instructions, or a precise list of missing prerequisites. A read confirmation alone does not validate a first use. If an external resource is unavailable, that path remains untested.
React Hook Form Best Practices
Development
Master React Hook Form: avoid anti-patterns, manage subscriptions, and handle reset, dirty state, and controlled inputs correctly.
Emotion to Mantine Migration
Development
Migrate Emotion styled-components to Mantine components with style props and CSS modules. Use when converting .styled.tsx files or removing @emotion imports.
Scope Creep Detector
Development
Analyzes git diffs against a stated intent to detect scope creep, unrelated files, broad PRs, and oversized changes, then suggests keep, split, or justify actions.