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Agent skill

Save As Standalone HTML

by asgeirtj in asgeirtj/system_prompts_leaks

Single self-contained file that works offline. An agent skill from asgeirtj/system_prompts_leaks.

CC0-1.0Auto-check passedFrontend & Design

Install Save As Standalone HTML

skills CLI
$ npx skills add asgeirtj/system_prompts_leaks --skill save-as-standalone-html -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install asgeirtj/system_prompts_leaks save-as-standalone-html --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/asgeirtj/system_prompts_leaks.git skills-src && mkdir -p .claude/skills && cp -r skills-src/Anthropic/claude-design/skills/save-as-standalone-html .claude/skills/save-as-standalone-html && rm -rf skills-src

Use ~/.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/

Facts

Skill name
save-as-standalone-html
GitHub stars
69k
Token cost
~1.4k tokens
SKILL.md length
760 words
Files
1
Skills in repo
128
Repo updated
First seen
Licence
CC0-1.0

At a glance

Single self-contained file that works offline. An agent skill from asgeirtj/system_prompts_leaks.

  • Works in 6 steps: Make a copy of the HTML file and update… → Add ext-resource-dependency meta tags → Create a thumbnail (REQUIRED — the… → …
  • Tasks that involve HTML artifacts
  • Reaches w3.org

What it does

Save As Standalone HTML is an agent skill from asgeirtj/system_prompts_leaks. Single self-contained file that works offline

Its SKILL.md is about 1.4k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Frontend & Design, covering HTML artifacts. The repository describes itself as: Documented system prompts from Anthropic - Claude Fable 5.1, Opus 5.5, Claude Design, Claude Code. OpenAI - ChatGPT GPT-6-Astra, Codex. Google - Gemini 3.8 Flash, 3.1 Pro… The licence is CC0-1.0.

When your agent uses it

  • Tasks that involve HTML artifacts

Example prompts

  • “/save-as-standalone-html”

Workflow steps

6 steps, taken from the step headings in SKILL.md.

  1. Make a copy of the HTML file and update code-referenced resources
  2. Add ext-resource-dependency meta tags
  3. Create a thumbnail (REQUIRED — the bundler will reject the file without it)
  4. Run the bundler
  5. Verify (internal check only)
  6. Present for download — MANDATORY

What it can do on your machine

Read from SKILL.md and the folder at commit 60d44cc. 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 (its code samples are html).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Hosts in commands or code, which the agent is likely to contact:

    • w3.org

    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

Save As Standalone HTML loads about 1.4k tokens when it runs. Until then it costs about 17 tokens; SKILL.md has 760 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~17
When it runs · the whole SKILL.md, loaded when a task matches
~1.4k

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 asgeirtj/system_prompts_leaks at commit 60d44cc, republished under its CC0-1.0 licence (© asgeirtj). 760 words, ~1,449 tokens.

Download SKILL.mdSave it as .claude/skills/save-as-standalone-html/SKILL.md (or your agent's skills folder).
name
save-as-standalone-html
description
Single self-contained file that works offline
user-invocable
true

Save as standalone HTML

Export the current design as a single self-contained HTML file that works completely offline — no external dependencies.

How it works

There is a deterministic bundler (super_inline_html tool) that can inline resources referenced directly in HTML attributes — img src/srcset, source src/srcset, video/audio/track src, video poster, SVG <image href>/<use href>, link href (stylesheets, favicons), script src, CSS url() and @import, inline style attributes. However, it CANNOT discover resources that are only referenced as strings in JavaScript or JSX code — for example:

  • An image src set in React: <img src={"./hero.png"} />
  • A background URL in a styled-component: background: url('./pattern.svg')
  • A dynamically imported script

Your job is to prepare the HTML file so the bundler can capture everything, then run it.

Step 1: Make a copy of the HTML file and update code-referenced resources

Copy the current HTML file. Read it. Copy its dependencies. Look through ALL the code (inline scripts, imported JSX files, styled-components, etc) for any resource URL that is referenced as a string in code rather than as an HTML attribute. This includes:

  • Image URLs in React/JSX (<img src={...} />, style={{ backgroundImage: ... }})
  • URLs in CSS-in-JS (styled-components, inline styles set via JS)
  • Script tags that import other scripts which themselves reference resources
  • Any fetch() or XMLHttpRequest calls that load assets
  • Audio/video sources set programmatically

Note: if you use the Anthropic API in the project, it will not work standalone. If this is core to the project, STOP and tell the user!

Step 2: Add ext-resource-dependency meta tags

For EACH resource found in step 1, add a <meta> tag in the <head>:

html
<meta name="ext-resource-dependency" content="<url>" data-resource-id="<id>" />

Where:

  • content is the URL of the resource (relative to the HTML file, or absolute)
  • data-resource-id is a short, unique identifier (e.g. "heroImage", "patternSvg")

Then update the code to reference window.__resources[id] instead of the hardcoded URL. At runtime in the bundled file, window.__resources[id] will contain a blob URL pointing to the inlined resource data.

Example:

html
<!-- In <head>: -->
<meta name="ext-resource-dependency" content="./hero.png" data-resource-id="heroImg" />
<meta name="ext-resource-dependency" content="./pattern.svg" data-resource-id="patternBg" />

<!-- In code, replace: -->
<!-- <img src={"./hero.png"} /> -->
<!-- with: -->
<!-- <img src={window.__resources.heroImg} /> -->

IMPORTANT:

  • The relative paths in content are relative to the HTML page itself
  • You must also do this for any external script tags that are imported and themselves reference resources — those scripts will be inlined by the bundler, but their resource references need to be lifted too
  • Be thorough! Missing even one resource means a broken image or missing asset in the final file
Show full SKILL.md (380 more words)Show less
Step 3: Create a thumbnail (REQUIRED — the bundler will reject the file without it)

Create a lightweight SVG thumbnail that acts as a splash screen while the bundled file unpacks. This SVG should be a simplified, representative preview of the design — e.g. the key shapes, layout silhouette, or a branded loading visual. It doesn't need to be pixel-perfect, just visually representative so the user sees something meaningful instantly. It will be displayed TINY so a simple glyph on a vibrant color BG is enough.

Add it as a <template> tag in the source HTML:

html
<template id="__bundler_thumbnail" data-bg-color="#0a5e3e">
  <svg viewBox="0 0 1200 800" xmlns="http://www.w3.org/2000/svg">
    <!-- Simplified icon -->
  </svg>
</template>
  • Set data-bg-color to match the page's background color
  • The SVG should use viewBox for proper aspect-fit scaling
  • Keep it simple — this is just a loading placeholder, not a full reproduction
  • Use the design's actual colors so the transition feels seamless

The bundler will extract this and display it fullscreen (aspect-fit with the background color) while unpacking assets, then replace it with the real page. It also remains visible as the permanent fallback when JavaScript is disabled.

Step 4: Run the bundler

If you made changes in steps 1-3, save the modified HTML file first. Then (or if no changes were needed) call:

super_inline_html({ input_path: "<path-to-html>", output_path: "My Deck.html" })

Give the output file a friendly human name.

Step 5: Verify (internal check only)

Read the tool result first — if any asset couldn't be resolved, super_inline_html lists it directly in its output ("N asset(s) could not be bundled: - asset not found: ./foo.png"). That's the authoritative miss list; fix those references and re-run before opening anything.

Then open the bundled output with show_html TO CHECK IT WORKS — this is a private verification step for YOU, not the delivery mechanism. Check get_webview_logs for runtime errors (JS exceptions, failed decodes). If there are issues, fix the source file and re-run.

Step 6: Present for download — MANDATORY

You MUST deliver the final file using present_fs_item_for_download pointing directly at the inlined HTML output. This is the ONLY correct way to hand off a standalone export.

  • Do NOT use show_html / show_to_user as the delivery step — those are preview tools, not download tools. The user cannot save the file from them.
  • Do NOT ask whether they want to download it — just call present_fs_item_for_download.
  • If you skip this step, the user has no way to get the file. This step is non-negotiable.

© asgeirtj, CC0-1.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in Anthropic/claude-design/skills/save-as-standalone-html of asgeirtj/system_prompts_leaks.

Open the folder on GitHubat commit 60d44cc

Compare with similar skills

Save As Standalone HTML 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.

Save As Standalone HTML compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Save As Standalone HTML this skillasgeirtj/system_prompts_leaks69k—~1.4kAutomated safety check: PassCC0-1.0
LobeHub Interactive Prototypelobehub/lobehub83k—~1.6kAutomated safety check: PassCustom licence
Paperclip Pagepaperclipai/paperclip99k—~1kAutomated safety check: PassMIT
Openkb Deck NeonVectifyAI/OpenKB4.8k1 repos~4.3kAutomated safety check: PassApache-2.0
Webhome Homepage Builderwebhtv/webhtv1.7k—~3.8kAutomated safety check: PassGPL-3.0
Solo Artifactssolo-agent/solo698—~961Automated safety check: PassMIT

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Categories

Questions about Save As Standalone HTML

What does Save As Standalone HTML do?

Single self-contained file that works offline. An agent skill from asgeirtj/system_prompts_leaks. Save As Standalone HTML is an agent skill from asgeirtj/system_prompts_leaks.

When should I use Save As Standalone HTML?

Save As Standalone HTML fits situations like: tasks that involve HTML artifacts.

How do I install Save As Standalone HTML in Claude Code?

Run `npx skills add asgeirtj/system_prompts_leaks --skill save-as-standalone-html -a claude-code`. Or copy the skill folder (Anthropic/claude-design/skills/save-as-standalone-html in asgeirtj/system_prompts_leaks) into .claude/skills/save-as-standalone-html in your project. Claude Code loads it when a task matches its description.

How do I install Save As Standalone HTML in Codex?

Run `npx skills add asgeirtj/system_prompts_leaks --skill save-as-standalone-html -a codex`. Or copy the skill folder (Anthropic/claude-design/skills/save-as-standalone-html in asgeirtj/system_prompts_leaks) into .agents/skills/save-as-standalone-html in your project. Codex loads it when a task matches its description.

Can I use Save As Standalone HTML 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 asgeirtj/system_prompts_leaks --skill save-as-standalone-html -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/save-as-standalone-html, .gemini/skills/save-as-standalone-html, .github/skills/save-as-standalone-html and .opencode/skills/save-as-standalone-html in your project.

What does Save As Standalone HTML need to run?

SKILL.md names no scripts, command-line tools or credentials: Save As Standalone HTML is instructions for the agent only.

Does Save As Standalone HTML access the network?

SKILL.md names 1 domain. In commands or code: w3.org; the agent is likely to contact it when it follows the instructions. This is read from the text; nothing was executed.

Is Save As Standalone HTML 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 Save As Standalone HTML use?

Save As Standalone HTML is published under the CC0-1.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Save As Standalone HTML use?

About 1.4k tokens (SKILL.md is roughly 5.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Save As Standalone HTML?

Skills that share tags, products or a category with Save As Standalone HTML: LobeHub Interactive Prototype (lobehub/lobehub, 83k stars), Paperclip Page (paperclipai/paperclip, 99k stars), Openkb Deck Neon (VectifyAI/OpenKB, 4.8k stars) and Webhome Homepage Builder (webhtv/webhtv, 1.7k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Save As Standalone HTML?

asgeirtj (a GitHub user) maintains it in asgeirtj/system_prompts_leaks, which has 69,280 GitHub stars. The repository holds 128 skills in this directory. The repository was last updated on October 10, 2026.

Source: asgeirtj/system_prompts_leaks on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.