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 jscraik/Agent-Skills --skill elixir-progit clone --depth 1 https://github.com/jscraik/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/jscraik/agent-skills/elixir-pro)<a href="https://agentmods.dev/skills/jscraik/agent-skills/elixir-pro"><img src="https://agentmods.dev/badge/skills/jscraik/agent-skills/elixir-pro/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/jscraik/agent-skills/elixir-pro"><img src="https://agentmods.dev/badge/skills/jscraik/agent-skills/elixir-pro.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
SkillSpector: 1 finding, up to low
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 →
- low Excessive Agency · line 99 Skill's behavior or capabilities extend beyond its stated purpose. Scope creep allows an agent to perform actions unrelated to its documented functionality, increasing the attack surface.Fix: Limit the skill's scope to its documented purpose. Remove instructions that enable the agent to perform actions outside its stated functionality.
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 | $0.00040 | $0.00671 |
| Opus 5 | $0.00020 | $0.00336 |
| Sonnet 5 | $0.00008 | $0.00134 |
| Haiku 4.5 | $0.00004 | $0.00067 |
Grade A, and why
elixir-pro 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 6d 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 — 112 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Table of Contents
When to use
- Use for Elixir/OTP implementation and review work.
- Use when fault tolerance or process boundaries are central.
Required inputs
- App context and supervision tree scope.
- Expected process lifecycle behavior.
- Error and retry expectations.
Deliverables
- Idiomatic Elixir updates.
- Clear OTP process boundaries.
- Explicit reliability notes when behavior changes.
OTP Structure
- Keep supervision trees explicit and shallow.
- Model long-lived state with GenServer only when state is required.
- Prefer pure modules for domain logic outside process boundaries.
Reliability
- Let supervisors restart failed workers.
- Use pattern matching to make invalid states impossible.
- Keep message protocols explicit and documented.
Examples
defmodule PortParser do
def parse(value) do
case Integer.parse(value) do
{port, ""} when port > 0 -> {:ok, port}
_ -> {:error, :invalid_port}
end
end
end
Failure mode
- If supervision strategy is unclear, hold structural changes and confirm intent.
Gotchas
- Process state mutations without clear ownership cause flaky behavior.
See Also
| Skill | When to use |
|---|---|
| [[rust-pro]] | Systems-level concurrency patterns that share OTP-style supervision thinking |
| [[he-fix-bugs]] | Triage distributed process failures with evidence-first diagnosis |
Topic map: [[agent-ops]]
Philosophy
- Optimize for clear, verifiable outcomes with the minimum necessary changes.
- Keep guidance deterministic so repeated runs produce consistent decisions.
Procedure
- Confirm scope, constraints, and required inputs before edits.
- Apply focused changes tied directly to the requested outcome.
- Re-run the highest-signal validations and capture concrete evidence.
What ships with it
4 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.
- 6d ago First seen · 112 lines · 40 tokens per session scan A e2ac15365a68
elixir-pro is a skill published in the GitHub repository jscraik/Agent-Skills (8 stars, last pushed 8d ago), licensed Apache-2.0. It adds 40 tokens to every session and 671 once invoked, about $0.0002 per session on Opus 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 2026-09-03.
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