What is html-artifact?

A process for creating a single self-contained HTML file, with its styles and scripts included inside the file. It supports formats such as reports, prototypes, diagrams, editors, and data visualizations.

Use it to generate offline HTML artifacts with layouts, visual elements, and optional interactions.

It helps you share or open rich interactive results without a build step, framework, or internet connection.

html-artifact — Skill for Claude Code by notque: A process for creating a single self-contained HTML file…

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add skills/notque/vexjoy-agent/html-artifact

Any agent

npx skills add notque/vexjoy-agent --skill html-artifact

Clone the repo

git clone --depth 1 https://github.com/notque/vexjoy-agent

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/notque/vexjoy-agent/html-artifact.svg)](https://agentmods.dev/skills/notque/vexjoy-agent/html-artifact)

Your own site

<a href="https://agentmods.dev/skills/notque/vexjoy-agent/html-artifact"><img src="https://agentmods.dev/badge/skills/notque/vexjoy-agent/html-artifact.svg" alt="Measured on agentmods" height="20"></a>

Per session 89 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 6,429 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00089	$0.06429
Opus 5	$0.00044	$0.03214
Sonnet 5	$0.00018	$0.01286
Haiku 4.5	$0.00009	$0.00643

Measured 2d ago against content hash e0e2df1a9968, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

html-artifact scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

The scan reads SKILL.md. This mod also ships 30 executable files (scripts/assemble-template.py, scripts/css_slop_rules.py, scripts/detect-shape.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/meta/html-artifact/SKILL.md · 456 lines

How it starts

The opening of the file, as written. The whole thing — 456 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/html - Self-Contained HTML Artifacts

Generate single self-contained .html files that replace markdown when the output needs color, interactivity, layout, or visualization. Auto-detect artifact shape from the request, load shape-specific patterns, generate, validate, deliver.

Core constraint: Every artifact is ONE .html file. All CSS in <style>, all JS in <script>. No CDN links, no frameworks, no build steps, no external dependencies. Works offline, opens in any browser.

Instructions

Overview

5-phase pipeline: DETECT SHAPE, LOAD CONTEXT, GENERATE, VALIDATE, DELIVER. Phase 1 classifies the request into one of 8 shapes via deterministic script. Phase 2 loads the Birchline design system plus shape-specific reference. Phase 3 dispatches a subagent to generate the HTML. Phase 4 validates structure. Phase 5 delivers the file path and offers browser preview. Phase 6 EXPORT (optional) renders to PDF when the user asks for one.

Phase 0: CHECK SAVED TEMPLATE (clone-first)

Before detecting a shape, check whether the request names or matches a saved template. A saved template is a frozen, human-authored layout; cloning it beats regenerating structure because the layout cannot drift.

Run: python3 skills/meta/html-artifact/scripts/fill-template.py --list

If the request names a listed template (e.g. "project kickoff", "business review", "system design") or clearly matches one:

Read templates/saved/<name>.slots.json to learn the slots.
Generate ONLY the slot content — never the layout, CSS, or chrome.
Write the slot values to a JSON file and run fill-template.py --template <name> --slots <file> --out <artifact>.
Skip Phases 1–3 (shape detection, assembly, generation). Go to Phase 4 VALIDATE.

The fill script fails loud on a missing required slot, an undeclared slot name, or a leftover marker. Fix the slot JSON; do not edit the template.

If no saved template matches, continue to Phase 1.

See "Fidelity & Authority" below for the content-vs-layout rule that governs clone mode.

Read the full file on GitHub · 456 lines

Files

What ships with it

60 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2d ago First seen · 456 lines · 89 tokens per session scan A e0e2df1a9968

Subscribe to this mod's changes

html-artifact is a skill published in the GitHub repository notque/vexjoy-agent (419 stars, last pushed yesterday), licensed MIT. It adds 89 tokens to every session and 6,429 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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html-artifact