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Install in OpenClaw
/install webperf-core-web-vitals
Description
Intelligent Core Web Vitals analysis with automated workflows and decision trees. Measures LCP, CLS, INP with guided debugging that automatically determines...
Usage Guidance
This skill appears to be what it claims: a collection of JavaScript snippets meant to run inside a page via Chrome DevTools to measure LCP, CLS, INP and related diagnostics. Before you run it, consider: 1) these snippets execute in the page context and will read performance entries and resource URLs/timings (they do not contain network exfiltration code), 2) they add outlines and observers and expose window functions (which may remain active in the page until the page is reloaded), and 3) cross-skill references mean deeper workflows may call other snippet sets — review/trust those other skills before using them on sensitive pages. If you have sensitive/secure sessions (banking, auth flows), run the snippets on a staging copy or non-sensitive page first. If you want higher assurance, review the repository link in SKILL.md (https://github.com/nucliweb/webperf-snippets) to confirm source integrity and recent commits.
Capability Analysis
Type: OpenClaw Skill
Name: webperf-core-web-vitals
Version: 0.1.0
The bundle is a legitimate collection of web performance diagnostic tools designed for use with Chrome DevTools. The JavaScript snippets (e.g., CLS.js, INP.js, LCP.js) utilize standard browser Performance APIs to measure Core Web Vitals and provide structured feedback to the AI agent. The SKILL.md file contains logical workflows and decision trees for performance auditing without any evidence of prompt injection attacks, data exfiltration, or malicious intent.
Capability Assessment
Purpose & Capability
Name/description promise (LCP, CLS, INP analysis and decision tree) lines up with the provided JS snippets and SKILL.md instructions that tell the agent to run those snippets in Chrome DevTools. No unrelated environment variables, binaries, or install steps are requested.
Instruction Scope
SKILL.md instructs the agent to evaluate the provided scripts via the chrome-devtools MCP and capture results. The scripts operate on performance APIs, DOM, and set PerformanceObservers and window helper functions (e.g., getINP). This is expected for in-page diagnostics, but note the scripts modify page DOM (outline styling) and register observers/globals that persist for the page lifetime.
Install Mechanism
No install spec is present (instruction-only skill with included JS snippets). No downloads or package installs are performed by the skill manifest itself.
Credentials
The skill declares no environment variables, no credentials, and no config paths. All required capabilities are limited to in-browser APIs and are proportional to the stated purpose.
Persistence & Privilege
always:false and normal model-invocation behavior. The only persistence is in-page: the scripts register observers and sometimes expose window functions to fetch tracked results. They do not modify agent or system-wide settings or request permanent platform presence.
How to Use
- Make sure OpenClaw is installed (local or Docker)
- Run the install command in chat:
/install webperf-core-web-vitals - After installation, invoke the skill by name or use
/webperf-core-web-vitals - Provide required inputs per the skill's parameter spec and get structured output
Version History
v0.1.0
Initial release of webperf-core-web-vitals with intelligent, automated workflows for Core Web Vitals debugging and optimization.
- Provides JavaScript snippets for measuring LCP, CLS, and INP in Chrome DevTools.
- Features guided debugging with decision trees that determine follow-up analysis based on audit results.
- Includes deep dive workflows for LCP (5 phases), CLS (loading vs. interaction), and INP (phase breakdown + attribution).
- Supports cross-skill integration with loading, interaction, and media investigation tools.
- Designed for use with Chrome DevTools MCP and compatible with related webperf skills.
Metadata
Frequently Asked Questions
What is Webperf Core Web Vitals?
Intelligent Core Web Vitals analysis with automated workflows and decision trees. Measures LCP, CLS, INP with guided debugging that automatically determines... It is an AI Agent Skill for Claude Code / OpenClaw, with 267 downloads so far.
How do I install Webperf Core Web Vitals?
Run "/install webperf-core-web-vitals" in the OpenClaw or Claude Code chat to install it in one step — no extra setup required.
Is Webperf Core Web Vitals free?
Yes, Webperf Core Web Vitals is completely free, licensed under MIT-0. You can download, install and use it at no cost.
Which platforms does Webperf Core Web Vitals support?
Webperf Core Web Vitals is cross-platform and runs anywhere OpenClaw / Claude Code is available (cross-platform).
Who created Webperf Core Web Vitals?
It is built and maintained by nucliweb (@nucliweb); the current version is v0.1.0.
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