Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add f-labs-io/agent-html-skills/plugin install html-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/f-labs-io/agent-html-skills/html-comparison-matrix)<a href="https://agentmods.dev/skills/f-labs-io/agent-html-skills/html-comparison-matrix"><img src="https://agentmods.dev/badge/skills/f-labs-io/agent-html-skills/html-comparison-matrix/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/f-labs-io/agent-html-skills/html-comparison-matrix"><img src="https://agentmods.dev/badge/skills/f-labs-io/agent-html-skills/html-comparison-matrix.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 | $0.00113 | $0.03193 |
| Opus 5 | $0.00056 | $0.01597 |
| Sonnet 5 | $0.00023 | $0.00639 |
| Haiku 4.5 | $0.00011 | $0.00319 |
Grade A, and why
html-comparison-matrix 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 5d 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 — 185 lines — stays where its author put it; the contents beside it link to each section on GitHub.
HTML Comparison Matrix
When picking between candidates on multiple criteria, a comparison matrix beats a paragraph. A weighted matrix beats an unweighted one — weights surface the implicit priorities and let the user argue with their own past judgments.
Phase boundary. This skill handles the evaluative phase of comparison — scoring candidates that already exist. If the user hasn't named candidates yet and is still asking "what are the options" or "show me approaches", hand off to
html-brainstorm-gridinstead. The boundary signal is whether candidates appear in the prompt: if so, score them here; if not, generate them there. The two skills are designed to compose — generate options there, then evaluate them here.
Pre-flight — run BEFORE writing the artifact
Invoke html-skills:html-skills-listen (Skill tool) first; it is idempotent. If it returns a URL, inject it verbatim as window.__CLAUDE_SUBMIT_URL__ in the HTML you are about to write, ?t= query string included (a local, single-session loopback handshake — not a credential). If it reported web/sandbox mode, leave that line out; submitToClaude then falls back to clipboard mode.
When to use this skill
- "Compare X, Y, and Z" (libraries, vendors, frameworks, designs)
- "Which [tool, library, vendor, approach] should we use?"
- "Help me decide between A and B"
- "Evaluate [X] against [Y, Z]"
- Build-vs-buy decisions
- Anything with multiple named candidates and multiple selection criteria
When NOT to use this skill
- The user is asking the skill to generate options ("brainstorm approaches", "show me ways"). Use
html-brainstorm-grid. - Only one candidate is named — no comparison to make. Use
html-spec-planningto write up the rationale. - The "comparison" is two paragraphs that don't need a weighted scoring system. A simple side-by-side in prose is fine.
Output requirements
The artifact has:
- A matrix of candidates × criteria
- Per-criterion weight sliders that update totals live
- Per-candidate score breakdowns
- A clear "verdict" pane that updates as weights change
- One Submit button that sends the configured matrix and current verdict back in the standard envelope
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.
- 5d ago Changed · -48 lines · -115 tokens per session 14450a967d36
- 9d ago First seen · 233 lines · 228 tokens per session scan A 9c98f115a464
html-comparison-matrix is a skill published in the GitHub repository f-labs-io/agent-html-skills (55 stars, last pushed 7d ago), licensed MIT. It adds 113 tokens to every session and 3,193 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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