Borrowing it
Nothing to install: this file belongs to ashishpatill/tell-proof. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/ashishpatill/tell-proof/master/.cursor/skills/responsive-performance/SKILL.mdgit clone --depth 1 https://github.com/ashishpatill/tell-proofWrote 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/ashishpatill/tell-proof/responsive-performance)<a href="https://agentmods.dev/skills/ashishpatill/tell-proof/responsive-performance"><img src="https://agentmods.dev/badge/skills/ashishpatill/tell-proof/responsive-performance/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/ashishpatill/tell-proof/responsive-performance"><img src="https://agentmods.dev/badge/skills/ashishpatill/tell-proof/responsive-performance.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 | $0.00064 | $0.00406 |
| Opus 5.5 | $0.00026 | $0.00162 |
| Sonnet 5.5 | $0.00013 | $0.00081 |
| Haiku 4.5 | $0.00006 | $0.00041 |
Grade A, and why
responsive-performance 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 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.
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.
What it actually says
responsive-performance
Always-on for every site build. Parent: premium-content-custom-web. Engine always
routes this node via routeSkills. Agents must execute it — not only list it.
Full playbook: agent-skills/web-design/premium-content-custom-web/responsive-performance/SKILL.md
Non-negotiables (auto-apply)
- WebP at display size — after adding photography under
apps/web/public/**, runpnpm media:site(orpnpm media:webp). Hero ≤1600w @q82; editorial ≤1200w; other ≤1000w. Prefer pruning superseded jpg/png (--prune). - Use
SiteImg(apps/web/src/components/site-media/SiteImg.tsx) for specimen media — rewrites.jpg/.png→.webp, setswidth/height,loading,fetchPriority,decoding. - LCP — one priority/eager hero image max; everything else lazy + async decode.
- CLS — always reserve intrinsic width/height; never un-sized
<img>. - Mobile-first — stack grids under ~800px; no autoplay video heroes.
- No heavy formats on the hot path — no multi-MB JPEG heroes in commits.
Verify
pnpm media:site -- --prune
# HTML should reference .webp; public/** should not keep hot-path multi-MB jpg after prune
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 · 35 lines · 64 tokens per session scan A 34f51d6aa88b
responsive-performance is a skill published in the GitHub repository ashishpatill/tell-proof (2 stars, last pushed 22d ago), licensed MIT. It adds 64 tokens to every session and 406 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-08-31.
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