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 pproenca/dot-skills --skill staff-level-elixirgit clone --depth 1 https://github.com/pproenca/dot-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/pproenca/dot-skills/staff-level-elixir)<a href="https://agentmods.dev/skills/pproenca/dot-skills/staff-level-elixir"><img src="https://agentmods.dev/badge/skills/pproenca/dot-skills/staff-level-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/pproenca/dot-skills/staff-level-elixir"><img src="https://agentmods.dev/badge/skills/pproenca/dot-skills/staff-level-elixir.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00133 | $0.01562 |
| Opus 5 | $0.00067 | $0.00781 |
| Sonnet 5 | $0.00027 | $0.00312 |
| Haiku 4.5 | $0.00013 | $0.00156 |
Grade A, and why
staff-level-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 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 — 88 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Staff-Level Elixir
Distilled staff-level judgment for Elixir on the BEAM — the design decisions Elixir, OTP, Ecto, and Phoenix force, and how an experienced engineer settles them, written so an agent applies them while writing or reviewing code. Each rule corrects a specific wrong default; there is no rule for things the model already gets right (syntax, basic idioms, the standard library).
When to Apply
- Writing or reviewing OTP code — deciding whether something needs a process, and which (GenServer, Task, Agent, ETS, supervisor)
- Handling failure — choosing between tagged tuples, exceptions,
with, and letting a process crash - Writing Ecto — queries, associations, transactions, changesets, large result sets
- Building Phoenix controllers and LiveViews — context boundaries, socket state, mount lifecycle
- Running concurrent work — parallel fan-out, fire-and-forget tasks, handling untrusted input
- Any request to make Elixir code more idiomatic, more fault-tolerant, or "staff-level"
Rule Categories
| # | Category | Prefix | Covers |
|---|---|---|---|
| 1 | Process & OTP Design | otp- |
Whether a problem needs a process, and which one; supervision |
| 2 | Error Handling & Let-It-Crash | err- |
Signalling failure; when to raise, rescue, or crash |
| 3 | Idioms & Design Choices | data- |
Pattern matching, Stream/Enum, iolists, pipes, macros |
| 4 | Concurrency & the Scheduler | conc- |
Bounded/isolated parallelism; atom-table safety |
| 5 | Ecto & Data Access | ecto- |
N+1, atomic writes, constraint races, large sets |
| 6 | Phoenix & LiveView | phx- |
Context boundaries, socket memory, mount lifecycle |
Quick Reference
1. Process & OTP Design
otp-genserver-not-default— a GenServer is a serialization point, not the default abstractionotp-ets-for-shared-reads— read-heavy shared state belongs in ETS, not behind a GenServer.getotp-supervise-over-manual-restart— child specs + DynamicSupervisor/Registry, not hand-rolled restart logicotp-handle-continue-init— defer heavy startup tohandle_continue;init/1blocks the supervisor
What ships with it
27 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.
- AGENTS.md 5.3 KB
- assets/templates/_template.md 994 B
- metadata.json 1.3 KB
- references/_sections.md 2.1 KB
- references/conc-async-stream-bounded.md 1.8 KB
- references/conc-atom-exhaustion.md 1.7 KB
- references/conc-task-supervised-nolink.md 1.2 KB
- references/data-functions-over-macros.md 1.5 KB
- references/data-iolists-over-concat.md 1.5 KB
- references/data-pattern-match-over-conditionals.md 1.6 KB
- references/data-pipe-idioms.md 1.4 KB
- references/data-stream-vs-enum.md 1.4 KB
- references/ecto-atomic-counters.md 1.4 KB
- references/ecto-db-constraints-over-validation.md 1.7 KB
- references/ecto-multi-for-transactions.md 1.6 KB
- references/ecto-preload-n-plus-one.md 1.4 KB
- references/ecto-stream-large-sets.md 1.3 KB
- references/err-let-it-crash.md 1.5 KB
- references/err-tagged-tuples-vs-raise.md 1.5 KB
- references/err-with-happy-path.md 1.6 KB
- references/otp-ets-for-shared-reads.md 1.7 KB
- references/otp-genserver-not-default.md 1.6 KB
- references/otp-handle-continue-init.md 1.3 KB
- references/otp-supervise-over-manual-restart.md 1.8 KB
- references/phx-context-boundary.md 1.5 KB
- references/phx-liveview-streams.md 1.4 KB
- references/phx-mount-twice-connected.md 1.3 KB
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 · 88 lines · 133 tokens per session scan A 376baee47344
staff-level-elixir is a skill published in the GitHub repository pproenca/dot-skills (205 stars, last pushed 24d ago), licensed MIT. It adds 133 tokens to every session and 1,562 once invoked, about $0.0007 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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