Render
LeoYeAI/openclaw-master-skills
Deploy and operate apps on Render (Blueprint + one-click Dashboard deeplink, same flow as Codex render-deploy).
A skill your agent uses when reviewing templates, rendered HTML, or shared components related to Analyze performance with WebPageTest.
MITAuto-check passed
Install Webpagetest
$ npx skills add thedaviddias/Front-End-Checklist --skill webpagetest -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install thedaviddias/Front-End-Checklist webpagetest --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/webpagetest .claude/skills/webpagetest && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "webpagetest" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/webpagetest into .claude/skills/webpagetest/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "webpagetest", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/webpagetestType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add thedaviddias/Front-End-Checklist --skill webpagetest -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install thedaviddias/Front-End-Checklist webpagetest --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/webpagetest .agents/skills/webpagetest && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "webpagetest" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/webpagetest into .agents/skills/webpagetest/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "webpagetest", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add thedaviddias/Front-End-Checklist --skill webpagetest -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install thedaviddias/Front-End-Checklist webpagetest --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/webpagetest .cursor/skills/webpagetest && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "webpagetest" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/webpagetest into .cursor/skills/webpagetest/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "webpagetest", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/thedaviddias/Front-End-Checklist.git --path skills/webpagetest--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add thedaviddias/Front-End-Checklist --skill webpagetest -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install thedaviddias/Front-End-Checklist webpagetest --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/webpagetest .gemini/skills/webpagetest && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "webpagetest" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/webpagetest into .gemini/skills/webpagetest/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "webpagetest", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install thedaviddias/Front-End-Checklist webpagetestInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add thedaviddias/Front-End-Checklist --skill webpagetest -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/webpagetest .github/skills/webpagetest && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "webpagetest" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/webpagetest into .github/skills/webpagetest/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "webpagetest", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add thedaviddias/Front-End-Checklist --skill webpagetest -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install thedaviddias/Front-End-Checklist webpagetest --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/webpagetest .opencode/skills/webpagetest && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "webpagetest" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/webpagetest into .opencode/skills/webpagetest/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "webpagetest", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
webpagetest- GitHub stars
- 74k
- Token cost
- ~431 tokens
- SKILL.md length
- 152 words
- Files
- 2 (incl. references)
- Skills in repo
- 390
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses when reviewing templates, rendered HTML, or shared components related to Analyze performance with WebPageTest.
- Reviewing templates
- SKILL.md covers Quick Reference, Check, Fix and Explain, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Shared components related to Analyze performance with WebPageTest
What it does
Webpagetest is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing templates, rendered HTML, or shared components related to Analyze performance with WebPageTest. Validate the final browser-facing markup, not just the source framework abstraction.
Its SKILL.md is about 430 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/rule.md`).
The repository describes itself as: 🗂 The essential checklist for modern web development, for humans and AI agents. The licence is MIT.
When your agent uses it
- Reviewing templates
- Shared components related to Analyze performance with WebPageTest
Example prompts
- “/webpagetest”
What it can do on your machine
Read from SKILL.md and the folder at commit e8d14d0. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
frontendchecklist.io
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Webpagetest loads about 431 tokens when it runs, and up to ~8k if it reads all its reference files. Until then it costs about 53 tokens; SKILL.md has 152 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from thedaviddias/Front-End-Checklist at commit e8d14d0, republished under its MIT licence (© thedaviddias). 152 words, ~431 tokens.
Download SKILL.mdSave it as
.claude/skills/webpagetest/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- webpagetest
- description
- Use when reviewing templates, rendered HTML, or shared components related to Analyze performance with WebPageTest. Validate the final browser-facing markup, not just the source framework abstraction.
- metadata.category
- html
- metadata.priority
- high
- metadata.difficulty
- intermediate
- metadata.estimatedTime
- 30
- metadata.source
- frontendchecklist.io
- metadata.url
- https://frontendchecklist.io/rules/html/webpagetest
Analyze performance with WebPageTest
WebPageTest reveals real-world performance issues that synthetic tools miss—like TTFB from actual locations, render-blocking patterns, and third-party script impact.
Quick Reference
- Run 3+ tests to get consistent results
- Test from locations near your users
- Use filmstrip view to identify visual progress
- Check waterfall for blocking resources and slow third-parties
Check
Use WebPageTest to analyze page performance, identify bottlenecks, and measure real-world loading metrics across different devices and connections.
Fix
Implement recommended optimizations from WebPageTest results including resource compression, caching, and critical path improvements.
Explain
Explain how WebPageTest provides insights into Core Web Vitals, loading waterfalls, and performance opportunities that synthetic testing can't reveal.
Code Review
Review templates, server-rendered HTML, and shared components that output markup related to Analyze performance with WebPageTest. Flag exact elements, attributes, and routes where the rendered HTML violates the rule.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
Rule page: https://frontendchecklist.io/rules/html/webpagetest
© thedaviddias, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 1 other file (references) in skills/webpagetest of thedaviddias/Front-End-Checklist.
- SKILL.md
- references/rule.md
Open the folder on GitHubat commit e8d14d0
Compare with similar skills
Webpagetest next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Webpagetest this skillthedaviddias/Front-End-Checklist | 74k | — | ~431 | Automated safety check: Pass | MIT | |
| RenderLeoYeAI/openclaw-master-skills | 2.2k | — | ~4.8k | Automated safety check: Pass | MIT | |
| Markdown Renderingsickn33/agentic-awesome-skills | 47k | 1 repos | ~751 | Automated safety check: Pass | MIT | |
| RenderAnil-matcha/awesome-muse-connectors | 1.3k | — | ~433 | Automated safety check: Pass | MIT | |
| Web Renderer Testremotion-dev/remotion | 63k | — | ~547 | Automated safety check: Pass | Custom licence | |
| Render HTMLwanshuiyin/Auto-claude-code-research-in-sleep | 17k | 1 repos | ~5.4k | Automated safety check: Notes | MIT |
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Markdown Rendering
sickn33/agentic-awesome-skills
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Render
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- Official
Web Renderer Test
remotion-dev/remotion
Add explicitly requested web renderer tests or update existing ones for implementation changes.
Render HTML
wanshuiyin/Auto-claude-code-research-in-sleep
Render an ARIS Markdown / JSON artifact (IDEAREPORT, AUTOREVIEW, KILLARGUMENT, PAPERPLAN, research-wiki state, etc.) into a single-file HTML view designed for human reading.
Cloudflare Browser Rendering Automation
ComposioHQ/awesome-claude-skills
Automate Cloudflare Browser Rendering tasks via Rube MCP (Composio).
More from thedaviddias/Front-End-Checklist
All 390 skills in this repoContent Dates Audit
thedaviddias/Front-End-Checklist
Audits article and blog pages for visible publish dates, Article JSON-LD with datePublished and dateModified, and Open Graph time tags, then fixes what is missing.
FAQPage Schema Markup
thedaviddias/Front-End-Checklist
Adds, checks and fixes FAQPage JSON-LD on pages with visible question-and-answer sections so it matches what readers see and can qualify for rich results.
Favicon Audit and Setup
thedaviddias/Front-End-Checklist
Checks that a site's favicon is linked, reachable and large enough for Google search results, and sets up ICO, SVG and Apple touch icon files when they are missing.
Content Freshness Signals
thedaviddias/Front-End-Checklist
Audits article pages for freshness signals, covering the Last-Modified header, Article JSON-LD dateModified and a visible last-updated date, and fixes mismatches.
Geo Meta Tags Audit
thedaviddias/Front-End-Checklist
Audits and fixes geo.region, geo.placename and geo.position meta tags on regional pages, noting where they help (Bing) and where they do not (Google).
Improve a Front-End Checklist Rule
thedaviddias/Front-End-Checklist
Scores and rewrites a Front-End Checklist rule MDX file against a scored quality rubric, replacing generic stub prompts with specific, actionable ones.
Questions about Webpagetest
What does Webpagetest do?
A skill your agent uses when reviewing templates, rendered HTML, or shared components related to Analyze performance with WebPageTest. Webpagetest is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing templates, rendered HTML, or shared components related to Analyze performance with WebPageTest.
When should I use Webpagetest?
Webpagetest fits situations like: reviewing templates; shared components related to Analyze performance with WebPageTest.
How do I install Webpagetest in Claude Code?
Run `npx skills add thedaviddias/Front-End-Checklist --skill webpagetest -a claude-code`. Or copy the skill folder (skills/webpagetest in thedaviddias/Front-End-Checklist) into .claude/skills/webpagetest in your project. Claude Code loads it when a task matches its description.
How do I install Webpagetest in Codex?
Run `npx skills add thedaviddias/Front-End-Checklist --skill webpagetest -a codex`. Or copy the skill folder (skills/webpagetest in thedaviddias/Front-End-Checklist) into .agents/skills/webpagetest in your project. Codex loads it when a task matches its description.
Can I use Webpagetest in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add thedaviddias/Front-End-Checklist --skill webpagetest -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/webpagetest, .gemini/skills/webpagetest, .github/skills/webpagetest and .opencode/skills/webpagetest in your project.
What does Webpagetest need to run?
SKILL.md names no scripts, command-line tools or credentials: Webpagetest is instructions for the agent only.
Does Webpagetest access the network?
SKILL.md names 1 domain. As links in the text: frontendchecklist.io. This is read from the text; nothing was executed.
Is Webpagetest safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Webpagetest use?
Webpagetest is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Webpagetest use?
About 431 tokens (SKILL.md is roughly 1.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 7.5k tokens, read only when the agent opens those files.
What are the alternatives to Webpagetest?
Skills that share tags, products or a category with Webpagetest: Render (LeoYeAI/openclaw-master-skills, 2.2k stars), Markdown Rendering (sickn33/agentic-awesome-skills, 47k stars), Render (Anil-matcha/awesome-muse-connectors, 1.3k stars) and Web Renderer Test (remotion-dev/remotion, 63k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Webpagetest?
thedaviddias (a GitHub user) maintains it in thedaviddias/Front-End-Checklist, which has 74,421 GitHub stars. The repository holds 390 skills in this directory. The repository was last updated on October 6, 2026.
Source: thedaviddias/Front-End-Checklist on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.