Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add j4flmao/agent-skills --skill elixirgit clone --depth 1 https://github.com/j4flmao/agent-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/j4flmao/agent-skills/elixir)<a href="https://agentmods.dev/skills/j4flmao/agent-skills/elixir"><img src="https://agentmods.dev/badge/skills/j4flmao/agent-skills/elixir/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/j4flmao/agent-skills/elixir"><img src="https://agentmods.dev/badge/skills/j4flmao/agent-skills/elixir.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Tool Misuse · line 260 Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).Fix: Validate all tool parameters against an allowlist. Reject dangerous parameter values (shell=True, --force, -rf /) and use safe defaults.
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00079 | $0.05033 |
| Opus 5.5 | $0.00032 | $0.02013 |
| Sonnet 5.5 | $0.00016 | $0.01007 |
| Haiku 4.5 | $0.00008 | $0.00503 |
Grade A, and why
elixir scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 614 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Elixir
Purpose
Build fault-tolerant, concurrent applications with Elixir/OTP — Phoenix web layer, LiveView interactivity, Ecto persistence, supervision trees, process architecture.
Agent Protocol
Trigger
User request includes: Elixir, Phoenix, Phoenix LiveView, OTP, BEAM, Elixir macros, Ecto, mix, phx.gen, Supervisor, GenServer, Phoenix channels, Phoenix PubSub, Elixir processes, iex.
Input Context
- Framework (Phoenix, Phoenix LiveView, bare Elixir)
- Persistence (Ecto with PostgreSQL, Ecto with SQLite, ETS)
- State management (GenServer, Agent, ETS, Phoenix PubSub)
- Deployment (Elixir releases, Docker, Gigalixir, Fly.io)
Output Artifact
Phoenix project structure, OTP supervision tree, Ecto schema, LiveView module, router config.
Response Format
Produce artifact directly. No preamble, no postamble, no explanations. No filler, no hedging, no transitions. Strip articles a/an/the where unambiguous. Compress output — why use many token when few do trick.
Completion Criteria
- Phoenix project generated with mix phx.new
- Contexts separated by domain boundary
- Ecto schemas with proper associations
- LiveView with state management and event handling
- Supervision tree with appropriate restart strategy
Max Response Length
4096 tokens
Workflow
Step 1: Phoenix Project Setup
# Install Phoenix
mix archive.install hex phx_new
# Create new Phoenix app
mix phx.new my_app --database postgres
mix phx.new my_app --database sqlite3 # Alternative
# Setup database
mix ecto.create
mix ecto.migrate
# Start server
mix phx.server
my_app/
lib/
my_app/
application.ex # OTP application start
repo.ex # Ecto Repo
accounts/ # Context: accounts
user.ex # Ecto schema
user_notifier.ex # Boundary call
user_token.ex
accounts.ex # Context module (public API)
catalog/ # Context: catalog
product.ex
category.ex
catalog.ex
store/ # Context: orders
order.ex
line_item.ex
store.ex
web/
endpoint.ex # Phoenix endpoint
router.ex # Router
controllers/ # Controllers (non-LiveView)
user_session_controller.ex
live/ # LiveViews
product_live/
index.ex
show.ex
cart_live/
index.ex
components/ # Shared components
layout.ex # App layout
navbar.ex
product_card.ex
templates/ # Templates (non-LiveView)
layout/
mailer.ex # Mailer (Swoosh/Bamboo)
my_app.ex # Module aliases
priv/
repo/
migrations/
20250101000000_create_users.exs
config/
config.exs
dev.exs
prod.exs
runtime.exs
mix.exs
What ships with it
6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 614 lines · 79 tokens per session scan A 03aaa696220b
elixir is a skill published in the GitHub repository j4flmao/agent-skills (33 stars, last pushed 10d ago), licensed MIT. It adds 79 tokens to every session and 5,033 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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elixir-phoenix-help
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