Phoenix
ericrisco/rsc-harness
A skill your agent uses when building an Elixir web app with Phoenix — contexts, Ecto schemas, changesets and migrations, LiveView, channels and PubSub, the generators, and the boundary between…
Expert in Elixir, Phoenix Framework, and OTP. An agent skill from pass-agent/loomkin.
Install Elixir Expert
$ npx skills add pass-agent/loomkin --skill elixir-expert -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install pass-agent/loomkin elixir-expert --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/pass-agent/loomkin.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/elixir-expert .claude/skills/elixir-expert && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "elixir-expert" agent skill from https://github.com/pass-agent/loomkin/tree/main/.agents/skills/elixir-expert into .claude/skills/elixir-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "elixir-expert", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/pass-agent/loomkin/tree/main/.agents/skills/elixir-expertType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add pass-agent/loomkin --skill elixir-expert -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install pass-agent/loomkin elixir-expert --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/pass-agent/loomkin.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/elixir-expert .agents/skills/elixir-expert && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "elixir-expert" agent skill from https://github.com/pass-agent/loomkin/tree/main/.agents/skills/elixir-expert into .agents/skills/elixir-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "elixir-expert", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add pass-agent/loomkin --skill elixir-expert -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install pass-agent/loomkin elixir-expert --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/pass-agent/loomkin.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/elixir-expert .cursor/skills/elixir-expert && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "elixir-expert" agent skill from https://github.com/pass-agent/loomkin/tree/main/.agents/skills/elixir-expert into .cursor/skills/elixir-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "elixir-expert", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/pass-agent/loomkin.git --path .agents/skills/elixir-expert--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add pass-agent/loomkin --skill elixir-expert -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install pass-agent/loomkin elixir-expert --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/pass-agent/loomkin.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/elixir-expert .gemini/skills/elixir-expert && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "elixir-expert" agent skill from https://github.com/pass-agent/loomkin/tree/main/.agents/skills/elixir-expert into .gemini/skills/elixir-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "elixir-expert", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install pass-agent/loomkin elixir-expertInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add pass-agent/loomkin --skill elixir-expert -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/pass-agent/loomkin.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/elixir-expert .github/skills/elixir-expert && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "elixir-expert" agent skill from https://github.com/pass-agent/loomkin/tree/main/.agents/skills/elixir-expert into .github/skills/elixir-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "elixir-expert", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add pass-agent/loomkin --skill elixir-expert -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install pass-agent/loomkin elixir-expert --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/pass-agent/loomkin.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/elixir-expert .opencode/skills/elixir-expert && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "elixir-expert" agent skill from https://github.com/pass-agent/loomkin/tree/main/.agents/skills/elixir-expert into .opencode/skills/elixir-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "elixir-expert", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
elixir-expert- GitHub stars
- 181
- Used in
- 1 other repo
- Token cost
- ~796 tokens
- SKILL.md length
- 294 words
- Files
- 1
- Skills in repo
- 14
- Repo updated
- First seen
- Licence
- MIT
At a glance
Expert in Elixir, Phoenix Framework, and OTP. An agent skill from pass-agent/loomkin.
- Works in 3 steps: Phoenix Application Setup → OTP Application Design → Real-Time with LiveView
- Building Elixir applications
- SKILL.md covers Purpose, When to Use, Quick Start and Decision Framework, plus 3 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Elixir Expert is an agent skill from pass-agent/loomkin. Expert in Elixir, Phoenix Framework, and OTP. Specializes in building concurrent, fault-tolerant, and real-time applications using the BEAM. Use when building Elixir applications, working with Phoenix, implementing GenServers, or designing distributed systems on the BEAM.
Its SKILL.md is about 800 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in AI & LLM Engineering, covering LLM observability. It works with Elixir. The repository describes itself as: What if AI agents could form teams as fluidly as humans? Spawn specialists in milliseconds, share discoveries in real-time, review each other's work, and remember everything… The licence is MIT.
When your agent uses it
- Building Elixir applications
- Working with Phoenix
- Implementing GenServers
- Designing distributed systems on the BEAM
Example prompts
- “/elixir-expert”
Requirements
- Python 3
- Node.js
Workflow steps
3 steps, taken from the step headings in SKILL.md.
What it can do on your machine
Read from SKILL.md and the folder at commit f769ae7. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Elixir Expert loads about 796 tokens when it runs. Until then it costs about 72 tokens; SKILL.md has 294 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from pass-agent/loomkin at commit f769ae7, republished under its MIT licence (© pass-agent). 294 words, ~796 tokens.
Download SKILL.mdSave it as
.claude/skills/elixir-expert/SKILL.md (or your agent's skills folder).- name
- elixir-expert
- description
- Expert in Elixir, Phoenix Framework, and OTP. Specializes in building concurrent, fault-tolerant, and real-time applications using the BEAM. Use when building Elixir applications, working with Phoenix, implementing GenServers, or designing distributed systems on the BEAM.
Elixir Expert
Purpose
Provides expertise in Elixir development, Phoenix Framework, and OTP patterns. Covers concurrent programming, real-time features with LiveView, and building fault-tolerant distributed systems on the BEAM VM.
When to Use
- Building Elixir applications
- Developing Phoenix web applications
- Implementing real-time features with LiveView
- Using OTP patterns (GenServer, Supervisor)
- Building distributed systems on BEAM
- Designing fault-tolerant architectures
- Working with Ecto for database access
Quick Start
Invoke this skill when:
- Building Elixir applications
- Developing Phoenix web applications
- Implementing real-time features with LiveView
- Using OTP patterns
- Designing fault-tolerant systems
Do NOT invoke when:
- Building Ruby on Rails apps (use rails-expert)
- Building Node.js backends (use javascript-pro)
- Building Python backends (use python-pro)
- Infrastructure automation (use terraform-engineer)
Decision Framework
Concurrency Pattern:
├── Stateful process → GenServer
├── Async work → Task
├── Background job → Oban or Task.Supervisor
├── Event streaming → GenStage / Broadway
├── Real-time UI → Phoenix LiveView
└── External service → Retry with exponential backoff
Supervision Strategy:
├── Process can crash independently → one_for_one
├── Processes depend on each other → one_for_all
├── Ordered restart needed → rest_for_one
└── Dynamic children → DynamicSupervisorCore Workflows
1. Phoenix Application Setup
- Generate Phoenix project
- Configure database with Ecto
- Define schemas and migrations
- Create contexts for business logic
- Build controllers or LiveViews
- Add authentication
- Deploy with releases
2. OTP Application Design
- Identify stateful components
- Design supervision tree
- Implement GenServers for state
- Add proper error handling
- Implement graceful shutdown
- Test supervision strategies
3. Real-Time with LiveView
- Generate LiveView module
- Define assigns and state
- Implement handle_event callbacks
- Use pubsub for broadcasts
- Optimize with temporary_assigns
- Add JS hooks if needed
Best Practices
- Let it crash - design for failure recovery
- Use supervision trees for fault tolerance
- Keep GenServer state minimal
- Use contexts to organize business logic
- Prefer immutable data transformations
- Test concurrent code with async: true
Anti-Patterns
| Anti-Pattern | Problem | Correct Approach |
|---|---|---|
| Large GenServer state | Memory and serialization | External storage, ETS |
| Defensive coding | Hides bugs | Let it crash, supervise |
| Blocking GenServer | Process bottleneck | Async tasks for I/O |
| No supervision | Unrecoverable crashes | Proper supervision tree |
| Mutable mindset | Bugs and race conditions | Embrace immutability |
© pass-agent, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in .agents/skills/elixir-expert of pass-agent/loomkin.
Open the folder on GitHubat commit f769ae7
Used in 1 other repository
We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in pass-agent/loomkin, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Elixir Expert next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Elixir Expert this skillpass-agent/loomkin | 181 | 1 repos | ~796 | Automated safety check: Pass | MIT | |
| Phoenixericrisco/rsc-harness | 156 | — | ~2.9k | Automated safety check: Notes | MIT | |
| Phx Watch PRoliver-kriska/claude-elixir-phoenix | 564 | — | ~1k | Automated safety check: Pass | MIT | |
| Ash Frameworkpodlove/radiator | 136 | — | ~2.1k | Automated safety check: Pass | MIT | |
| Elixir Architectmaxim-ist/elixir-architect | 145 | — | ~7.6k | Automated safety check: Pass | MIT | |
| Phoenix Frameworkpodlove/radiator | 136 | — | ~562 | Automated safety check: Pass | MIT |
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oliver-kriska/claude-elixir-phoenix
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podlove/radiator
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Elixir Architect
maxim-ist/elixir-architect
A skill your agent uses when designing or architecting Elixir/Phoenix applications, creating comprehensive project documentation, planning OTP supervision trees, defining domain models with Ash…
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podlove/radiator
Use this skill working with Phoenix Framework. An agent skill from podlove/radiator.
- Official
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Related
Works with
Categories
Questions about Elixir Expert
What does Elixir Expert do?
Expert in Elixir, Phoenix Framework, and OTP. An agent skill from pass-agent/loomkin. Elixir Expert is an agent skill from pass-agent/loomkin. Expert in Elixir, Phoenix Framework, and OTP.
When should I use Elixir Expert?
Elixir Expert fits situations like: building Elixir applications; working with Phoenix; implementing GenServers; designing distributed systems on the BEAM.
How do I install Elixir Expert in Claude Code?
Run `npx skills add pass-agent/loomkin --skill elixir-expert -a claude-code`. Or copy the skill folder (.agents/skills/elixir-expert in pass-agent/loomkin) into .claude/skills/elixir-expert in your project. Claude Code loads it when a task matches its description.
How do I install Elixir Expert in Codex?
Run `npx skills add pass-agent/loomkin --skill elixir-expert -a codex`. Or copy the skill folder (.agents/skills/elixir-expert in pass-agent/loomkin) into .agents/skills/elixir-expert in your project. Codex loads it when a task matches its description.
Can I use Elixir Expert in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add pass-agent/loomkin --skill elixir-expert -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/elixir-expert, .gemini/skills/elixir-expert, .github/skills/elixir-expert and .opencode/skills/elixir-expert in your project.
What does Elixir Expert need to run?
SKILL.md names no scripts, command-line tools or credentials: Elixir Expert is instructions for the agent only. Our summary lists: Python 3; Node.js.
Does Elixir Expert access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Elixir Expert safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Elixir Expert use?
Elixir Expert is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Elixir Expert use?
About 796 tokens (SKILL.md is roughly 3.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Elixir Expert?
Skills that share tags, products or a category with Elixir Expert: Phoenix (ericrisco/rsc-harness, 156 stars), Phx Watch PR (oliver-kriska/claude-elixir-phoenix, 564 stars), Ash Framework (podlove/radiator, 136 stars) and Elixir Architect (maxim-ist/elixir-architect, 145 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Elixir Expert?
pass-agent (a GitHub organization) maintains it in pass-agent/loomkin, which has 181 GitHub stars. The repository holds 14 skills in this directory. The repository was last updated on May 17, 2026.
Source: pass-agent/loomkin on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.