web-perf skillA
web-perf is agent-read markdown (skill) from vanducng/skills: Measure Core Web Vitals (LCP, CLS, INP, FCP, TTFB), JS heap, and record DevTools performance traces against a running Chrome - attaches to vd:browser-profile's deterministic CDP ports, no Puppeteer, no separate browser. Use when the user says "why is this page slow", "measure web vitals", "check LCP/CLS/INP", "record a performance trace", "profile page load", or wants performance evidence in an e2e run..
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
How to install
mdr add vanducng/skills/web-perf@v0.1.0mdr add vanducng/skills/web-perf@sha256:d0466e0f4ffd46c2Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_cnlnpha4gph4c26v)
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Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v0.1.0 latest | 2026-08-16 | c83d21b | 5,811 B | A | view · diff |
| v0.1.0 | 2026-07-24 | 51405ee | 5,799 B | A | view · diff |
| v0.1.0 | 2026-07-10 | 6f1e7cf | 5,825 B | A | view · diff |
| v0.1.0 | 2026-06-12 | 68fc8f7 | 5,538 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (5811 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
vanducng/skills · 8 stars · license MIT · pushed 2026-09-17 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_cnlnpha4gph4c26v GET https://markdownregistry.com/api/v1/resolve?ref=vanducng/skills/web-perf GET https://markdownregistry.com/api/v1/blob/d0466e0f4ffd46c24dd487e885f1b415caace82a07ca6d8bbad94bb66d65e5b7
Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.