Agent Skills (MengTo/Skills)

Why it's ranked here

The format is the selling point: no runtime, no package, no lock-in. Any agent that can read Markdown can use it, and the README gives loading instructions for Codex, Claude Code and Cursor. It is MIT licensed. The repository also polices its own demos with a validation script that rejects thin prompt recipes, oversized previews and pages that call remote URLs. That is more quality control than most prompt collections carry, and it is why this ranks above a typical folder of saved prompts.

What's good

The demo checks have real numbers behind them. Every skill demo needs a standalone page with a doctype, viewport tag and title, a recreation prompt of at least 120 words with three fixed headings, and a preview screenshot at least 1200 by 700 pixels and under 2 MB. Non-workflow demos must include a reduced-motion fallback. Demos imported from the Neuform design source run inside a sandboxed frame that allows scripts but not same-origin access, behind a content security policy, with checksums that a test script verifies. The 3D and workflow guides each include a table telling you which skill to reach for.

Tradeoffs

Parts of the repository still read as one person's working folder. The web-design notes call themselves an internal draft pending finalization, and the agent guide points at the author's own machine path. Some skills are personal, such as one that drafts X posts in the author's voice. The counts drift: the Codex section is headed nineteen but lists sixteen, and the 3D guide describes fifteen skills while the README tree shows nine. Codex is the first-class target; the README tells agents to use the Codex browser for browser work in the repository. There is no installer, so updates mean recopying folders by hand.

How to use it well

Pick the narrowest skill for the job rather than loading the whole library, which is what the 3D guide itself advises. It suits a designer or front-end developer who wants an agent to reproduce a specific effect: a gradient border, progressive blur, a scroll reveal, a globe, a water surface. Open the skill's demo page and recreation prompt first to judge whether the output matches your taste. It does not cover backend, data or testing work beyond its own browser-game QA and screenshot workflows.

Observed

License

MIT

Format

Plain Markdown skill folders, one required instructions file per skill

Install surface

No package; copy a skill folder into the agent's skills directory or load it as context

Agents documented

Codex, Claude Code, Cursor

Demo validation

Node script with built-in modules only, enforcing demo page, prompt and preview rules

Imported demo isolation

Sandboxed iframe with scripts allowed and same-origin denied, plus content security policy

Draft status

Web-design folder notes describe it as an internal draft pending finalization