#168168th of 324 in Skills, plugins and prompts
webperf-snippets
Tested web performance snippets for DevTools, CLI, MCP and agent skills
Documentation ↗
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- Stars
- 1.5k
- License
- MIT
- Last commit
- Nov 2026
- Last release
- Oct 2026
- Language
- JavaScript
1,419 on 10 Apr 20261,457 on 30 Oct 2026
From GitHub's daily star counts.
Checked on GitHub.
Overview
56 JavaScript snippets that measure Core Web Vitals, loading, interaction and media performance, each returning an object that follows one schema. They run in the DevTools console, a Playwright-based CLI, an MCP server, a DevTools extension (beta) or as Agent Skills, so an AI agent interprets fixed measurement code instead of writing its own.
Who it is for: Web developers and AI-agent users auditing page performance
Strengths
- Same snippets run in console, CLI, MCP server, extension and Agent Skills
- Snippets are tested in CI and return structured objects under one schema
- CLI supports performance budgets and a GitHub Action for pull request gating
- Skills include decision trees that pick the next snippet from the previous result
Weaknesses
- Snippets are tested only in Chrome; Safari has limited Performance API support
- DevTools extension is beta and installs from a zip
- CLI and MCP server need Playwright with headless Chromium
- Lab measurements of single page loads; field data needs a CrUX key
What it needs
- no GPU
- Needs Node.js (npx), Playwright / headless Chromium, Chrome DevTools MCP (for skills), CrUX API key (optional)
- Models: Claude Code, Cursor, VS Code, Gemini CLI, OpenCode
Quick answers
Is webperf-snippets open source?
Yes. Its code is on GitHub under the MIT license.
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