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.
npx skills add joshuadavidthomas/agent-skills --skill html-artifactsgit clone --depth 1 https://github.com/joshuadavidthomas/agent-skillsWrote 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.
[](https://agentmods.dev/skills/joshuadavidthomas/agent-skills/html-artifacts)<a href="https://agentmods.dev/skills/joshuadavidthomas/agent-skills/html-artifacts"><img src="https://agentmods.dev/badge/skills/joshuadavidthomas/agent-skills/html-artifacts.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00112 | $0.02162 |
| Opus 5 | $0.00056 | $0.01081 |
| Sonnet 5 | $0.00022 | $0.00432 |
| Haiku 4.5 | $0.00011 | $0.00216 |
Grade A, and why
html-artifacts 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 8d ago.
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.
How it starts
The opening of the file, as written. The whole thing — 167 lines — stays where its author put it; the contents beside it link to each section on GitHub.
HTML Artifacts
Generate a visual document that earns its use of HTML: the result should be easier to look at, compare, or manipulate than prose alone. Default to a self-contained local .html document, not a website, dashboard, or slide deck.
Non-Negotiables
- Ground first. Read the source material and trace the relevant behavior before designing the artifact.
- Default to document mode. The artifact must stand on its own for an asynchronous reader. Use presentation mode only when explicitly requested or clearly intended for a live talk.
- Keep the static story complete. Interaction may deepen the explanation; it must not be required to discover the main conclusion.
- Make interaction answer a question. Every control must satisfy: reader question → action → immediate visible answer. Remove controls that do not.
- Produce one true offline file by default. Inline CSS, JavaScript, SVG, data, and essential assets. Do not rely on CDNs, remote fonts,
fetch, or a server. - Keep it local unless asked. Artifacts may expose source code, architecture, or review findings. Do not publish, upload, or create a public URL without explicit permission.
- Validate the final file in a browser. Do not call an artifact finished from source inspection alone.
Choose the Mode
| Mode | Use for | Shape |
|---|---|---|
| Document (default) | Codebase, feature, PR, plan, incident, or research explanation | Scrollable, skimmable, complete prose, stable anchors, citations, print-friendly |
| Explorable document | Causal mechanisms, parameter tradeoffs, before/after states, coupled representations | Complete default state plus a few local controls with immediate feedback |
| Presentation | A live walkthrough where a speaker supplies context | One idea per view, keyboard navigation, explicit progress, speaker notes or captions |
If HTML adds no useful spatial comparison, diagram, or interaction, say so. If the user explicitly requested HTML, honor the request and make a restrained document rather than inventing spectacle.
What ships with it
7 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.
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.
- 8d ago First seen · 167 lines · 112 tokens per session scan A e9a635525f30
html-artifacts is a skill published in the GitHub repository joshuadavidthomas/agent-skills (50 stars, last pushed 1mo ago), licensed MIT. It adds 112 tokens to every session and 2,162 once invoked, about $0.0006 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 2026-08-30.
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