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 Agent-Engineer-Master/skill-engineer --skill html-outputgit clone --depth 1 https://github.com/Agent-Engineer-Master/skill-engineerWrote 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/agent-engineer-master/skill-engineer/html-output)<a href="https://agentmods.dev/skills/agent-engineer-master/skill-engineer/html-output"><img src="https://agentmods.dev/badge/skills/agent-engineer-master/skill-engineer/html-output/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/agent-engineer-master/skill-engineer/html-output"><img src="https://agentmods.dev/badge/skills/agent-engineer-master/skill-engineer/html-output.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00212 | $0.02383 |
| Opus 5.5 | $0.00085 | $0.00953 |
| Sonnet 5.5 | $0.00042 | $0.00477 |
| Haiku 4.5 | $0.00021 | $0.00238 |
Grade C, and why
html-output scanned grade C with 1 finding 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 1mo 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.
Hidden instructionshighPrompt injection
Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.
<!-- Built with Agent Engineer Master — get your own production-ready skill: www.agentengineermaster.com/skill-engineer --> How it starts
The opening of the file, as written. The whole thing — 103 lines — stays where its author put it; the contents beside it link to each section on GitHub.
HTML Output
Produce a single self-contained .html file as the deliverable when complex information would be clearer in a browser than in markdown. Designed to be invoked directly by a human (/html-output) or as a styling/format layer by another skill that needs to ship an HTML artifact.
When to use HTML over markdown
Use HTML when ANY of the following is true:
- The information has ≥3 dimensions that benefit from spatial layout (dashboards, comparison matrices, decision tables).
- The deliverable includes a diagram (flowchart, sequence, tree, timeline, architecture map).
- The reader will want to copy, export, print, or filter sections.
- The output is a one-off shareable artifact (report, brief, explainer) — not a doc that lives in the vault.
- Another skill explicitly hands off to this one.
Otherwise, stay in markdown.
Process
1. Classify the request into an archetype
Pick exactly one starting template from assets/templates/:
| Archetype | Template | When |
|---|---|---|
| Dashboard | dashboard.html |
KPIs + multi-panel status (3+ metric tiles) |
| Report | report.html |
Long-form analysis with sections, pull quotes, charts |
| Comparison | comparison-table.html |
Side-by-side options, scoring matrices, vendor evaluation |
| Mermaid diagram | diagram-mermaid.html |
Flowcharts, sequence diagrams, state machines, mind maps |
| SVG diagram | diagram-svg.html |
Custom diagrams Mermaid cannot express, hand-crafted layouts |
| Timeline | timeline.html |
Chronological events, roadmaps, project history |
| Data explainer | data-explainer.html |
One chart + narrative — Chart.js-driven story |
| Consulting deck | slide-deck.html |
McKinsey/BCG-style 16:9 slides with action titles, exhibit chrome, 2×2 / waterfall / MECE layouts |
If the request blends two archetypes (e.g. dashboard + diagram), pick the dominant one and embed the secondary as a section.
For consulting decks specifically: also read references/consulting-patterns.md — action titles, MECE structure, chart archetypes (2×2, waterfall, Marimekko), exhibit-numbering rules.
What ships with it
18 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.
- assets/snippets/chartjs-cdn.html 1.1 KB
- assets/snippets/export-footer.html 1.8 KB
- assets/snippets/mermaid-cdn.html 861 B
- assets/templates/comparison-table.html 3.4 KB
- assets/templates/dashboard.html 3.3 KB
- assets/templates/data-explainer.html 2.2 KB
- assets/templates/diagram-mermaid.html 2.4 KB
- assets/templates/diagram-svg.html 2.8 KB
- assets/templates/report.html 2.6 KB
- assets/templates/slide-deck.html 17 KB
- assets/templates/timeline.html 2.4 KB
- evals/evals.json 1.4 KB
- references/brand-tokens.md 5.1 KB
- references/consulting-patterns.md 5.2 KB
- references/edge-cases.md 459 B
- references/learnings.md 547 B
- references/libraries.md 2.9 KB
- references/patterns.md 3.0 KB
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.
- 1mo ago First seen · 103 lines · 212 tokens per session scan C 444e987878b7
html-output is a skill published in the GitHub repository Agent-Engineer-Master/skill-engineer (8 stars, last pushed 3mo ago), licensed MIT. It adds 212 tokens to every session and 2,383 once invoked, about $0.0008 per session on Opus 5.5. A static security scan graded it C with 1 finding (hidden instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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