performance-tuner

performance-tuner is a skill for Claude Code from kevinaimonster/skill-hub. It costs 176 tokens per session (3,385 once invoked), scanned A, original, no licence file.

A web performance helper for improving page speed, loading metrics, and build size.

In plain words
What is it for?
Use it to investigate Core Web Vitals, large bundles, slow first rendering, layout shifts, and other front-end performance issues.
Why use it?
It helps identify why a site loads slowly or receives poor Lighthouse results, where Lighthouse is a tool that audits website quality and speed.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter.

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.

agentmods
npx agentmods add skills/kevinaimonster/skill-hub/performance-tuner
Any agent
npx skills add kevinaimonster/skill-hub --skill performance-tuner
Clone the repo
git clone --depth 1 https://github.com/kevinaimonster/skill-hub

Made for: Claude Code.

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 performance-tuner

README.md
[![agentmods](https://agentmods.dev/badge/skills/kevinaimonster/skill-hub/performance-tuner.svg)](https://agentmods.dev/skills/kevinaimonster/skill-hub/performance-tuner)
Your own site
<a href="https://agentmods.dev/skills/kevinaimonster/skill-hub/performance-tuner"><img src="https://agentmods.dev/badge/skills/kevinaimonster/skill-hub/performance-tuner.svg" alt="Measured on agentmods" height="20"></a>
Per session 176 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,385 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00176 $0.03385
Opus 5 $0.00088 $0.01692
Sonnet 5 $0.00035 $0.00677
Haiku 4.5 $0.00018 $0.00338

Measured 6d ago against content hash 0ae6ab132c9b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

performance-tuner 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 6d 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.

skills/performance-tuner/SKILL.md · 403 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

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. 6d ago First seen · 403 lines · 176 tokens per session scan A 0ae6ab132c9b

Subscribe to this mod's changes

performance-tuner is a skill published in the GitHub repository kevinaimonster/skill-hub (3 stars, last pushed 5mo ago), with no licence file. It adds 176 tokens to every session and 3,385 once invoked, about $0.0009 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 2026-08-31.

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