Scoped, optional reference to Modern Web Guidance so the agent can look up native platform features on web work, filling the gap at rung 3 of the ladder. Three additive changes, no compact-ruleset surgery: - skills/ponytail/SKILL.md: "Web tasks: rung 3 lookup" section after the ladder. Runtime source only, not byte-compared, so no six-file sync. - README.md: one "Pairs well with" line, matching the Caveman pattern. - examples/web-platform-lookup.md: a <dialog closedby> vs Radix before/after in the date-picker.md style. Lookup, not license: MWG suggests, the ladder filters. Absent CLI changes nothing. No new INVARIANT phrase; rule-copy check stays green. Co-authored-by: Claude <noreply@anthropic.com>
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Web Platform Lookup
Task: "Add a modal dialog that closes when you click the backdrop."
Rung 3 of the ladder is "native platform feature covers it?" On web work the
trap is that the agent forgets what the platform already does and reaches for a
library. When ponytail has Modern Web Guidance
on hand, rung 3 gets a lookup: modern-web search "modal dialog light dismiss".
Without Ponytail
npm install @radix-ui/react-dialog
import * as Dialog from "@radix-ui/react-dialog";
export default function Modal({ open, onOpenChange, children }) {
return (
<Dialog.Root open={open} onOpenChange={onOpenChange}>
<Dialog.Portal>
<Dialog.Overlay className="overlay" />
<Dialog.Content className="content">
{children}
<Dialog.Close className="close">×</Dialog.Close>
</Dialog.Content>
</Dialog.Portal>
</Dialog.Root>
);
}
A dependency, a portal, an overlay node, and controlled open state, to put a box on top with a backdrop.
With Ponytail
modern-web search "modal dialog light dismiss" →
modern-web retrieve light-dismiss-a-dialog. The platform has it:
<!-- ponytail: <dialog> + closedby, browser does the backdrop, focus trap, and Esc -->
<dialog closedby="any">
<p>...</p>
</dialog>
document.querySelector("dialog").showModal();
1 dependency + portal/overlay machinery → 0 dependencies + a <dialog>.
The ::backdrop is free, focus is trapped and restored for you, Esc closes
it, and closedby="any" adds click-outside dismissal. The browser team did the
work.
The point
MWG suggests the cutting edge, ponytail keeps only the rung that holds. The
lookup found light-dismiss-a-dialog; the ladder took it because it deletes a
dependency. The same search would have offered scroll-driven animations and
view transitions for other tasks, and the ladder would have skipped them when
the task didn't need them. Lookup, not license.