Webperf
Webperf is an agent skill (a SKILL.md file) from nucliweb/webperf-snippets. Web performance measurement and debugging toolkit. It works with Claude Code, Cursor, Gemini CLI and OpenCode and has 1,454 GitHub stars across a repository of 2 listed skills. Install it by copying the skill folder into your agent's skills directory.
github.com/nucliweb/webperf-snippets/skills/webperf (opens in a new tab)
Data as of from the GitHub API; description from the skill's SKILL.md. Report an error
Add this skill
Claude
This repository is a Claude Code plugin marketplace. In Claude Code:
/plugin marketplace add nucliweb/webperf-snippets
/plugin install webperf@webperf-snippetsIn the Claude apps, zip the webperf folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).
ChatGPT / Codex
Codex reads skills from .agents/skills/ in a repo or ~/.agents/skills/ for every project:
git clone --depth 1 https://github.com/nucliweb/webperf-snippets.git
cp -r webperf-snippets/skills/webperf .agents/skills/webperf # repo; ~/.agents/skills for all projectsStandalone skills also load in the ChatGPT desktop app.
Cursor
Cursor loads skills from .cursor/skills/ (or ~/.cursor/skills/) and also reads .claude/skills/:
git clone --depth 1 https://github.com/nucliweb/webperf-snippets.git
cp -r webperf-snippets/skills/webperf .cursor/skills/webperf # project; ~/.cursor/skills for all projectsSource (checked Oct 7, 2026): code.claude.com/docs/en/skills (opens in a new tab), code.claude.com/docs/en/plugin-marketplaces (opens in a new tab), support.claude.com/en/articles/12512180-using-skills-in-claude (opens in a new tab), learn.chatgpt.com/docs/build-skills (opens in a new tab), cursor.com/docs/context/skills (opens in a new tab)
What this skill does
Web performance measurement and debugging toolkit. Use when the user asks about web performance, wants to audit a page, or says "analyze performance", "debug lcp", "check ttfb", "measure core web vitals", "audit images", or similar. A collection of 56 JavaScript snippets for measuring and debugging web performance in Chrome DevTools. Each snippet runs in the page and returns a structured result object.
When it triggers
- Use when the user asks about web performance, wants to audit a page, or says "analyze performance", "debug lcp", "check ttfb", "measure core web vitals", "audit images", or similar.
- "analyze performance"
- "debug lcp"
- "check ttfb"
- "measure core web vitals"
- "audit images"
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How do I install the Webperf skill?
In Claude Code, run /plugin marketplace add nucliweb/webperf-snippets and then /plugin install webperf@webperf-snippets. For Codex or Cursor, copy the webperf folder into .agents/skills/ or .cursor/skills/.
Is the Webperf skill free?
Yes. The repository is open source under the MIT license.
Is Webperf maintained?
The repository's most recent commit was on Oct 26, 2026. Its latest release is v2.1.0. appsgit only lists skills from repositories with a commit in the last six months.