Deno Patterns

Deno Patterns is a skill for Claude Code, Codex from AmariahAK/atlarix-skills. It costs 3 tokens per session (348 once invoked), scanned A, original, Apache-2.0.

A guide to Deno projects, where Deno is a JavaScript and TypeScript runtime with explicit permissions for network, file, and other access. It covers imports, project structure, tests, formatting, and permission choices.

In plain words
What is it for?
Use it to inspect Deno projects, configure imports, run tests and formatting, and choose minimal permissions for scripts.
Why use it?
It helps prevent unexpected permission failures and keeps dependencies and project entry points organized.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to inspect Deno projects, configure imports, run tests and formatting, and choose minimal permissions for scripts.

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Install with agentmods
npx agentmods add skills/amariahak/atlarix-skills/deno
Install

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.

Any agent
npx skills add AmariahAK/atlarix-skills --skill deno
Clone the repo
git clone --depth 1 https://github.com/AmariahAK/atlarix-skills

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for Deno Patterns

README.md
[![agentmods](https://agentmods.dev/badge/skills/amariahak/atlarix-skills/deno/github.svg)](https://agentmods.dev/skills/amariahak/atlarix-skills/deno)
Your own site
<a href="https://agentmods.dev/skills/amariahak/atlarix-skills/deno"><img src="https://agentmods.dev/badge/skills/amariahak/atlarix-skills/deno/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.

agentmods 80×15 button for Deno Patterns

Your own site · 80×15
<a href="https://agentmods.dev/skills/amariahak/atlarix-skills/deno"><img src="https://agentmods.dev/badge/skills/amariahak/atlarix-skills/deno.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 3 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 348 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00003 $0.00348
Opus 5 $0.00002 $0.00174
Sonnet 5 $0.00001 $0.00070
Haiku 4.5 $0.00000 $0.00035

Measured 8d ago against content hash 15daad7d3682, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

Deno Patterns 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 8d 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.

skills/deno/SKILL.md · 53 lines

What it actually says

Deno Patterns

When to use this skill

Use this skill when working on Deno projects and you want predictable module imports, permission-aware runtime behavior, and clean project structure.

Core patterns

Permissions are part of the contract

Deno requires explicit permissions. Make them intentional:

  • --allow-net for network
  • --allow-read for filesystem reads
  • avoid --allow-all in production scripts

Project structure

Common:

  • deno.json / deno.jsonc
  • mod.ts as entrypoint for libraries
  • main.ts for apps

Dependency management

  • prefer import maps
  • keep third-party imports centralized

Testing

  • use deno test
  • keep tests deterministic

Atlarix tool notes

  • Explore: inspect deno.json and entrypoints; trace imports.
  • Build: run deno test and deno fmt if configured.
  • Debug: check permission errors first; they’re common.
  • Review: verify permission flags are minimal and documented.

Common mistakes to avoid

  • Using --allow-all by default
  • Scattering dependencies across files
  • Ignoring permission failures and “fixing” by widening permissions

Mini-checklist

  • Minimal permissions
  • Imports centralized
  • Tests use deno tooling
Changes

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.

  1. 8d ago First seen · 53 lines · 3 tokens per session scan A 15daad7d3682

Subscribe to this mod's changes

Deno Patterns is a skill published in the GitHub repository AmariahAK/atlarix-skills (2 stars, last pushed 4d ago), licensed Apache-2.0. It adds 3 tokens to every session and 348 once invoked, about $0.0000 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.