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-brainstorm-grid)<a href="https://agentmods.dev/skills/f-labs-io/agent-html-skills/html-brainstorm-grid"><img src="https://agentmods.dev/badge/skills/f-labs-io/agent-html-skills/html-brainstorm-grid/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-brainstorm-grid"><img src="https://agentmods.dev/badge/skills/f-labs-io/agent-html-skills/html-brainstorm-grid.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 | $0.00115 | $0.03008 |
| Opus 5 | $0.00057 | $0.01504 |
| Sonnet 5 | $0.00023 | $0.00602 |
| Haiku 4.5 | $0.00012 | $0.00301 |
Grade A, and why
html-brainstorm-grid 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 — 172 lines — stays where its author put it; the contents beside it link to each section on GitHub.
HTML Brainstorm Comparison Grid
When the user is undecided between approaches, the strongest move is a grid of distinctly different options laid out side-by-side, each labeled with the tradeoff it makes. The grid forces contrast — if two options are too similar, one of them isn't pulling its weight.
Phase boundary. This skill handles the generative phase of comparison — generating candidates the user hasn't named yet. Once specific candidates exist and the question shifts to "which one wins on these criteria", hand off to
html-comparison-matrix. The boundary signal is whether candidates appear in the prompt: if not, generate them here; if so, score them there. The two skills are designed to compose — explore here, then evaluate there.
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
- "Generate a few approaches for X"
- "I'm not sure which direction to take"
- "Show me variations / alternatives / options"
- "Compare directions for X before I commit"
- "Try different X" (where X is layout, naming, structure, tone, etc.)
- Any time the user is exploring rather than committing
When NOT to use this skill
- The user names specific candidates ("compare React, Vue, Svelte"). Use
html-comparison-matrix. - The user has already chosen and just wants to score the choice. Use
html-comparison-matrix. - The output is a single recommendation rather than a set of alternatives. Use
html-spec-planning. - The user wants to capture and rearrange their own ideas as an editable tree. Use
html-mind-map.
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 · -52 lines · -120 tokens per session 44b8267be052
- 10d ago First seen · 224 lines · 235 tokens per session scan A 56a149d62058
html-brainstorm-grid is a skill published in the GitHub repository f-labs-io/agent-html-skills (55 stars, last pushed 7d ago), licensed MIT. It adds 115 tokens to every session and 3,008 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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