web-perf

web-perf is a skill for Claude Code, Codex from secondsky/sap-skills. It costs 96 tokens per session (2,051 once invoked), scanned A, original, GPL-3.0.

A web-performance audit tool that uses Chrome DevTools to measure loading and interaction behavior in a browser. It checks Core Web Vitals—metrics for loading speed, responsiveness, and visual stability—along with related network and accessibility problems.

In plain words
What is it for?
Use it to audit, profile, debug, or optimize websites; measure LCP, INP, CLS, FCP, TBT, and Speed Index; and investigate rendering, network, layout, caching, and accessibility issues.
Why use it?
It replaces guesswork with measurements and points to likely causes such as blocking files, slow request chains, layout shifts, and caching problems. This makes it easier to decide what to fix first.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing. Also seen: installed under .agents/ (shared by several agents).

Good fit Use it to audit, profile, debug, or optimize websites; measure LCP, INP, CLS, FCP, TBT, and Speed Index; and investigate rendering, network, layout, caching, and accessibility issues.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/secondsky/sap-skills/web-perf
Install

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.

Any agent
npx skills add secondsky/sap-skills --skill web-perf
Clone the repo
git clone --depth 1 https://github.com/secondsky/sap-skills

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for web-perf

README.md
[![agentmods](https://agentmods.dev/badge/skills/secondsky/sap-skills/web-perf/github.svg)](https://agentmods.dev/skills/secondsky/sap-skills/web-perf)
Your own site
<a href="https://agentmods.dev/skills/secondsky/sap-skills/web-perf"><img src="https://agentmods.dev/badge/skills/secondsky/sap-skills/web-perf/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.

agentmods 80×15 button for web-perf

Your own site · 80×15
<a href="https://agentmods.dev/skills/secondsky/sap-skills/web-perf"><img src="https://agentmods.dev/badge/skills/secondsky/sap-skills/web-perf.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 96 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,051 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00096 $0.02051
Opus 5.5 $0.00038 $0.00820
Sonnet 5.5 $0.00019 $0.00410
Haiku 4.5 $0.00010 $0.00205

Measured 1mo ago against content hash 94c5cb377666, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

web-perf 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.

.agents/skills/web-perf/SKILL.md · 202 lines

The source is not reproduced here

Licensed GPL-3.0

The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Changes

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.

  1. 1mo ago First seen · 202 lines · 96 tokens per session scan A 94c5cb377666

Subscribe to this mod's changes

web-perf is a skill published in the GitHub repository secondsky/sap-skills (469 stars, last pushed 4d ago), licensed GPL-3.0. It adds 96 tokens to every session and 2,051 once invoked, about $0.0004 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 2026-08-30.

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