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 oaustegard/claude-skills --skill developing-preactgit clone --depth 1 https://github.com/oaustegard/claude-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/oaustegard/claude-skills/developing-preact)<a href="https://agentmods.dev/skills/oaustegard/claude-skills/developing-preact"><img src="https://agentmods.dev/badge/skills/oaustegard/claude-skills/developing-preact/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/oaustegard/claude-skills/developing-preact"><img src="https://agentmods.dev/badge/skills/oaustegard/claude-skills/developing-preact.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 3 findings, up to medium
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 →
- medium MCP Rug Pull · line 186 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 464 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 514 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
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 | $0.00076 | $0.04191 |
| Opus 5.5 | $0.00030 | $0.01676 |
| Sonnet 5.5 | $0.00015 | $0.00838 |
| Haiku 4.5 | $0.00008 | $0.00419 |
Grade A, and why
developing-preact 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 — 519 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Preact Developer
Overview
Transform Claude into a specialized Preact developer with expertise in building standards-based web applications using native-first architecture. This skill prioritizes native JavaScript, HTML, and Web APIs over external dependencies, enabling creation of performant, maintainable applications with minimal tooling overhead.
Core Philosophy
Native-First Development: Leverage ES modules, Import Maps, Web Components, native form validation, Fetch API, and built-in DOM methods before reaching for external libraries. Default to zero-build solutions with HTM and vendored ESM imports for rapid prototyping and small-to-medium applications.
Always Deliver in Artifacts: All code should be created as artifacts to enable iterative editing across sessions.
When to Use This Skill
Trigger this skill when working on:
- Preact projects of any complexity level
- Data visualization applications requiring CSV/JSON parsing and interactive charts
- Single-page applications using HTM tagged template literals
- WebGL/shader-based mathematical visualizations
- Web Components integration projects
- Zero-build prototypes with CDN-based dependencies
- Progressive web applications emphasizing accessibility and performance
Project Type Decision Tree
Follow this decision tree to determine the optimal architecture:
1. Standalone Prototype or Demo
Characteristics: Quick prototype, demo, educational example, or proof of concept
Architecture:
- HTM syntax with import maps
- Vendored ESM dependencies (fetched from npm registry via
scripts/vendor.sh) - Tailwind CSS via CLI (purged, minified)
- Single HTML file or minimal file structure
- No build process
Start with: Run bash scripts/vendor.sh to fetch dependencies, then use assets/boilerplate.html as the foundation
2. Small-to-Medium Application (No Build Tooling)
Characteristics: Production application without existing build infrastructure, <10 components, straightforward state management
What ships with it
7 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 Changed · -2 lines 7fbac4cab4ec
- 1mo ago First seen · 521 lines · 76 tokens per session scan A a2b1311bd13a
developing-preact is a skill published in the GitHub repository oaustegard/claude-skills (154 stars, last pushed 3d ago), licensed MIT. It adds 76 tokens to every session and 4,191 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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