Production Audit
affaan-m/ECC
Local-evidence production readiness audit for shipped apps, pre-launch reviews, post-merge checks, and "what breaks in prod?" questions without sending repo data to an external audit service.
A skill your agent uses when auditing page weight for crawl efficiency, investigating why certain page content is not appearing in Google's index, or reviewing server-rendered pages that embed large…
MITAuto-check passed
Install HTML Size
$ npx skills add thedaviddias/Front-End-Checklist --skill html-size -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install thedaviddias/Front-End-Checklist html-size --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/html-size .claude/skills/html-size && 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 "html-size" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/html-size into .claude/skills/html-size/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "html-size", 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/html-sizeType 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 html-size -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install thedaviddias/Front-End-Checklist html-size --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/html-size .agents/skills/html-size && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "html-size" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/html-size into .agents/skills/html-size/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "html-size", 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 html-size -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install thedaviddias/Front-End-Checklist html-size --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/html-size .cursor/skills/html-size && 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 "html-size" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/html-size into .cursor/skills/html-size/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "html-size", 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/html-size--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 html-size -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install thedaviddias/Front-End-Checklist html-size --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/html-size .gemini/skills/html-size && 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 "html-size" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/html-size into .gemini/skills/html-size/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "html-size", 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 html-sizeInstalls 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 html-size -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/html-size .github/skills/html-size && 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 "html-size" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/html-size into .github/skills/html-size/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "html-size", 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 html-size -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 html-size --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/html-size .opencode/skills/html-size && 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 "html-size" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/html-size into .opencode/skills/html-size/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "html-size", 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
html-size- GitHub stars
- 74k
- Token cost
- ~786 tokens
- SKILL.md length
- 389 words
- Files
- 2 (incl. references)
- Skills in repo
- 390
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses when auditing page weight for crawl efficiency, investigating why certain page content is not appearing in Google's index, or reviewing server-rendered pages that embed large…
- Works in 6 steps: Measure: curl -so /dev/null -w… → If large inline JSON is the cause… → If inline SVG is the cause: move SVGs to… → …
- Auditing page weight for crawl efficiency
- SKILL.md covers Quick Reference, Check, Fix and Explain, plus 1 more section
- Calls curl
What it does
HTML Size is an agent skill from thedaviddias/Front-End-Checklist. Use when auditing page weight for crawl efficiency, investigating why certain page content is not appearing in Google's index, or reviewing server-rendered pages that embed large JSON payloads in HTML.
Its SKILL.md is about 790 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
- Auditing page weight for crawl efficiency
- Investigating why certain page content is not appearing in Googles index
- Reviewing server-rendered pages that embed large JSON payloads in HTML
Example prompts
- “/html-size”
Workflow steps
6 steps, taken from the first numbered list in SKILL.md.
- Measure: curl -so /dev/null -w '%{size_download}' https://yoursite.com/page | awk '{print $1/1024 " KB"}'
- If large inline JSON is the cause (common in Next.js NEXT_DATA)
- If inline SVG is the cause: move SVGs to external files and load with or .
- If base64 images are the cause: serve images from a CDN and reference via URL.
- Enable gzip/Brotli compression on the server — Googlebot fetches the compressed response.
- Minify HTML output in production (remove whitespace and comments).
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
Shell commands in SKILL.md call:
curl
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
HTML Size loads about 786 tokens when it runs, and up to ~1.7k if it reads all its reference files. Until then it costs about 53 tokens; SKILL.md has 389 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). 389 words, ~786 tokens.
Download SKILL.mdSave it as
.claude/skills/html-size/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- html-size
- description
- Use when auditing page weight for crawl efficiency, investigating why certain page content is not appearing in Google's index, or reviewing server-rendered pages that embed large JSON payloads in HTML.
- metadata.category
- seo
- metadata.priority
- medium
- metadata.difficulty
- intermediate
- metadata.estimatedTime
- 10
- metadata.source
- frontendchecklist.io
- metadata.url
- https://frontendchecklist.io/rules/seo/html-size
Keep HTML documents under crawl limits
Googlebot has a documented crawl size limit of approximately 15MB per HTML document. Content beyond this threshold is not parsed or indexed. Excessively large HTML also slows Googlebot crawls, reducing how many of your pages are crawled per budget period.
Quick Reference
- Googlebot stops parsing HTML beyond approximately 15MB; content after that point is not indexed
- Large HTML is usually caused by inline JSON data dumps, excessive inline SVG, or unminified JavaScript in
<script>tags - Target HTML document size under 2MB for optimal crawl efficiency; investigate anything over 5MB
Check
Measure the raw HTML response size (before compression) for each page. Flag pages over 2MB (investigate) and over 5MB (critical). Identify the cause of oversized HTML: (1) Large inline JSON (<script id='__NEXT_DATA__'> or similar). (2) Inline SVG files. (3) Base64-encoded images in HTML. (4) Inline CSS with large amounts of utility classes. (5) Unminified scripts in <script> tags.
Fix
- Measure:
curl -so /dev/null -w '%{size_download}' https://yoursite.com/page | awk '{print $1/1024 " KB"}' - If large inline JSON is the cause (common in Next.js
__NEXT_DATA__):- Reduce data passed to
getServerSideProps/getStaticProps— only pass what the page renders - Use React Server Components (Next.js 13+) to avoid client hydration payloads
- Reduce data passed to
- If inline SVG is the cause: move SVGs to external files and load with
<img>or<use>. - If base64 images are the cause: serve images from a CDN and reference via URL.
- Enable gzip/Brotli compression on the server — Googlebot fetches the compressed response.
- Minify HTML output in production (remove whitespace and comments).
Show full SKILL.md (132 more words)Show less
Explain
Google's crawl infrastructure parses only the first ~15MB of an HTML document. Pages that exceed this limit have their tail content silently omitted from Google's index. Beyond the hard limit, large HTML documents consume more crawl budget, meaning fewer of your pages are crawled per day. This particularly affects large e-commerce sites or pages that server-render large datasets into HTML.
Code Review
Check the response Content-Length header or measure the raw HTML byte count. Inspect <script type='application/json'> or <script id='__NEXT_DATA__'> blocks — count their size in bytes. Flag any single block over 500KB. Check for inline SVG elements (look for <svg> in body HTML) that should be external files. Verify HTML is served with gzip or Brotli encoding.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
© 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/html-size of thedaviddias/Front-End-Checklist.
- SKILL.md
- references/rule.md
Open the folder on GitHubat commit e8d14d0
Compare with similar skills
HTML Size 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 |
|---|---|---|---|---|---|---|
| HTML Size this skillthedaviddias/Front-End-Checklist | 74k | — | ~786 | Automated safety check: Pass | MIT | |
| Production Auditaffaan-m/ECC | 276k | 1 repos | ~1.9k | Automated safety check: Pass | MIT | |
| SEO Auditevery-app/open-seo | 23k | — | ~3.8k | Automated safety check: Pass | MIT | |
| Aims Auditalirezarezvani/claude-skills | 28k | — | ~1.3k | Automated safety check: Pass | MIT | |
| Geo Auditsickn33/agentic-awesome-skills | 47k | 1 repos | ~3.4k | Automated safety check: Notes | MIT | |
| OmniRoute Audit and Policy CLIdiegosouzapw/OmniRoute | 74k | — | ~733 | Automated safety check: Pass | MIT |
Similar skills
SEO Audit
every-app/open-seo
Audit a website, investigate its real search opportunities, and deliver a short data-backed report on the few changes most likely to grow organic traffic that converts.
Aims Audit
alirezarezvani/claude-skills
/cs:aims-audit <scope — ISO/IEC 42001 AIMS internal-audit 6-question forcing interrogation.
Geo Audit
sickn33/agentic-awesome-skills
Full website GEO+SEO audit with parallel subagent delegation.
OmniRoute Audit and Policy CLI
diegosouzapw/OmniRoute
Command reference for omniroute's audit, logs, policy and telemetry commands: search and export audit trails, manage access policies and review request history for compliance work.
Audit Preparation
sickn33/agentic-awesome-skills
Audit preparation register: required document, period covered, request and receipt dates, preparer and reviewer, auditor queries and adjustments.
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 HTML Size
What does HTML Size do?
A skill your agent uses when auditing page weight for crawl efficiency, investigating why certain page content is not appearing in Google's index, or reviewing server-rendered pages that embed large…. HTML Size is an agent skill from thedaviddias/Front-End-Checklist. Use when auditing page weight for crawl efficiency, investigating why certain page content is not appearing in Google's index, or reviewing server-rendered pages that embed large JSON payloads in HTML.
When should I use HTML Size?
HTML Size fits situations like: auditing page weight for crawl efficiency; investigating why certain page content is not appearing in Googles index; reviewing server-rendered pages that embed large JSON payloads in HTML.
How do I install HTML Size in Claude Code?
Run `npx skills add thedaviddias/Front-End-Checklist --skill html-size -a claude-code`. Or copy the skill folder (skills/html-size in thedaviddias/Front-End-Checklist) into .claude/skills/html-size in your project. Claude Code loads it when a task matches its description.
How do I install HTML Size in Codex?
Run `npx skills add thedaviddias/Front-End-Checklist --skill html-size -a codex`. Or copy the skill folder (skills/html-size in thedaviddias/Front-End-Checklist) into .agents/skills/html-size in your project. Codex loads it when a task matches its description.
Can I use HTML Size 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 html-size -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/html-size, .gemini/skills/html-size, .github/skills/html-size and .opencode/skills/html-size in your project.
What does HTML Size need to run?
Going by SKILL.md and its folder, HTML Size needs the command-line tools its instructions call (curl).
Does HTML Size 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 HTML Size 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 HTML Size use?
HTML Size 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 HTML Size use?
About 786 tokens (SKILL.md is roughly 3.1k 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 901 tokens, read only when the agent opens those files.
What are the alternatives to HTML Size?
Skills that share tags, products or a category with HTML Size: Production Audit (affaan-m/ECC, 276k stars), SEO Audit (every-app/open-seo, 23k stars), Aims Audit (alirezarezvani/claude-skills, 28k stars) and Geo Audit (sickn33/agentic-awesome-skills, 47k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains HTML Size?
thedaviddias (a GitHub user) maintains it in thedaviddias/Front-End-Checklist, which has 74,412 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.