web-perf-ops SKILL.md skillA
web-perf-ops from 0xdarkmatter/claude-mods is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add 0xdarkmatter/claude-mods/web-perf-ops@git:20261005.2bd5197Pins git:20261005.2bd5197 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- 0xdarkmatter/claude-mods
- Path
skills/web-perf-ops/SKILL.md- Versions recorded
- 2
- Latest version
- git:20261005.2bd5197, committed Oct 5, 2026
- First version recorded
- Oct 5, 2026
- Size
- 13,855 bytes
- Repository stars
- 68
- License
- MIT
Frontend page speed and Core Web Vitals (LCP, INP, CLS), method first: field data (CrUX, RUM) vs lab (Lighthouse, WebPageTest), find the failing metric's subpart, then fix images, fonts, JavaScript and third-party tags, critical CSS and caching/CDN headers, and lock wins with Lighthouse CI budgets. Covers Craft CMS levers (Blitz, eager loading, transforms, craft-vite). Use when pages load or respond slowly, PageSpeed/Lighthouse scores drop, or Search Console flags Core Web Vitals.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Web Performance Operations
> Verified against web.dev + Chrome docs (2026-10-05). Every threshold below lives once in
> `assets/web-perf-facts.json`. `scripts/check-web-perf-facts.py --offline` fails if this
> table and the catalog disagree, and `--live` (weekly) fails if Google moves a number.
Diagnose and fix frontend page speed the way Core Web Vitals are judged: **field data
decides whether there is a problem, lab data explains it, and each fix targets the
failing metric's dominant subpart**, not "the score". Server-side profiling, load
testing and backend latency belong to `perf-ops`; this skill takes over once the question
is about what a browser experiences.
## The method
```
1 FIELD Is it real? CrUX p75 (PSI field block, CrUX API, Search Console) or your RUM.
Phone and desktop separately. No field data -> say the verdict is lab-only.
2 METRIC Which Core Web Vital fails, and which SUBPART:
LCP = TTFB | load delay | load duration | render delay
INP = input delay | processing | presentation CLS = which element, why
3 LAB Reproduce for a trace: Lighthouse, DevTools Performance panel, WebPageTest
…Read the whole file at its exact version.
How to install
mdr add 0xdarkmatter/claude-mods/web-perf-ops@sha256:d67ab92c5aa33790The line at the top of this page pins the label git:20261005.2bd5197, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_4ff5rdv52m7h5j7s)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, all committed on Oct 5, 2026.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261005.2bd5197 latest | 2026-10-05 | 2bd5197 | 13,855 B | A | view · diff |
| git:20261005.57e4648 | 2026-10-05 | 57e4648 | 13,502 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 (13855 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
0xdarkmatter/claude-mods · 68 stars · license MIT · pushed 2026-10-14 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_4ff5rdv52m7h5j7s GET https://markdownregistry.com/api/v1/resolve?ref=0xdarkmatter/claude-mods/web-perf-ops GET https://markdownregistry.com/api/v1/blob/d67ab92c5aa337901ef35bc51e1b7e98d537bd14dbca8f35746bd3376ac70b62
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.