new-deno-app

new-deno-app is a skill for Claude Code from jackfranklin/dotfiles. It costs 50 tokens per session (3,937 once invoked), scanned A, original, MIT.

A starter setup for a personal web app using Deno 2, Hono, Deno KV, Eta, HTMX, and PicoCSS. It includes password login and support for installing the app as a progressive web app (PWA).

In plain words
What is it for?
Use it when starting a personal app with server-side pages, a built-in key-value database, simple browser interactions, password protection, and PWA support.
Why use it?
It removes the repetitive setup work for a small app built with this specific technology combination. It also provides conventions for authentication, templates, storage, browser interaction, and deployment.

Skill for Claude Code

Written for Claude Code: disable-model-invocation in frontmatter. Also seen: mentions CLAUDE.md.

Good fit Use it when starting a personal app with server-side pages, a built-in key-value database, simple browser interactions, password protection, and PWA support.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/jackfranklin/dotfiles/new-deno-app
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 jackfranklin/dotfiles --skill new-deno-app
Clone the repo
git clone --depth 1 https://github.com/jackfranklin/dotfiles

Made for: Claude Code.

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 new-deno-app

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

Your own site · 80×15
<a href="https://agentmods.dev/skills/jackfranklin/dotfiles/new-deno-app"><img src="https://agentmods.dev/badge/skills/jackfranklin/dotfiles/new-deno-app.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,937 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 2 findings, 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 Privilege Escalation · line 402
    Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.
    Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
  • medium Excessive Agency · line 438
    Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.
    Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
How audits are shown
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 $0.00050 $0.03937
Opus 5 $0.00025 $0.01969
Sonnet 5 $0.00010 $0.00787
Haiku 4.5 $0.00005 $0.00394

Measured 9d ago against content hash 9da0a414724b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

new-deno-app scanned grade A with 1 finding 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 9d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

self.addEventListener("fetch", (e) => e.respondWith(fetch(e.request)))
claude/skills/new-deno-app/SKILL.md · 484 lines

How it starts

The opening of the file, as written. The whole thing — 484 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are scaffolding a new personal web app. These apps follow a strict set of conventions:

  • Deno 2 runtime, no build step — TypeScript runs natively
  • Hono for routing (from JSR: jsr:@hono/hono@^4)
  • Deno KV for the database (built-in to Deno)
  • Eta for server-side HTML templates (from JSR: jsr:@eta-dev/eta@^3)
  • HTMX 2 for frontend interactivity (CDN, no npm)
  • PicoCSS classless for styling (CDN, no npm)
  • Single shared APP_PASSWORD env var for auth — SHA-256 hash in a session cookie
  • PWA: manifest.json + minimal pass-through service worker
  • Deployed to Deno Deploy via GitHub push to main

Step 1: Gather information

Always ask the user for all of the following interactively — do not attempt to parse $ARGUMENTS:

  1. app-name — kebab-case, used for directory name and GitHub repo name
  2. Display Name — full title shown in browser tab and manifest (e.g. "Book Tracker")
  3. Short name — ≤12 characters, shown on Android home screen under the icon (e.g. "Books")
  4. Description — one sentence describing what the app does
  5. Theme color — hex color for PWA theme/background (default: #ffffff)
  6. Emoji — single emoji used as the app logo in the header (default: 📋)
  7. Data model — what are the main things this app stores? Describe the entity name(s) and their fields briefly.

Confirm all values with the user before proceeding.

Step 2: Determine project directory

Check whether the current working directory is empty (contains no files or subdirectories, ignoring dotfiles like .git).

  • If the current directory is empty: use it as the project root. All files will be created here.
  • If the current directory is not empty: tell the user: "The current directory isn't empty. Please create and switch to a new empty directory for the project, then run /new-deno-app again." Stop here — do not proceed.

Step 3: Create project

Create all files in the project root determined in Step 2. All files below use the exact patterns from the reference app.

Read the full file on GitHub · 484 lines

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. 9d ago First seen · 484 lines · 50 tokens per session scan A 9da0a414724b

Subscribe to this mod's changes

new-deno-app is a skill published in the GitHub repository jackfranklin/dotfiles (254 stars, last pushed yesterday), licensed MIT. It adds 50 tokens to every session and 3,937 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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