performance-reviewer

performance-reviewer is an agent for Claude Code from Dragoon0x/everything-design-taste. It costs 20 tokens per session (186 once invoked), scanned A, original, MIT.

A reviewer for website and app frontend speed. It examines measures such as Core Web Vitals, which are standard indicators of loading speed, responsiveness, and layout stability.

In plain words
What is it for?
Auditing loading performance, reviewing image and font handling, checking JavaScript bundle size and caching, and organizing improvement suggestions by impact.
Why use it?
It identifies causes of slow or unstable pages, including oversized images, fonts, JavaScript, caching, and mobile network conditions.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the edt plugin — 117 skills, 80 agents shipped together

Good fit Auditing loading performance, reviewing image and font handling, checking JavaScript bundle size and caching, and organizing improvement suggestions by impact.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/dragoon0x/everything-design-taste/performance-reviewer
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.

Clone the repo
git clone --depth 1 https://github.com/Dragoon0x/everything-design-taste

Made for: Claude Code.

Or install edt, the plugin that ships this one along with the rest of its 117 skills, 80 agents.

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-reviewer

README.md
[![agentmods](https://agentmods.dev/badge/agents/dragoon0x/everything-design-taste/performance-reviewer.svg)](https://agentmods.dev/agents/dragoon0x/everything-design-taste/performance-reviewer)
Your own site
<a href="https://agentmods.dev/agents/dragoon0x/everything-design-taste/performance-reviewer"><img src="https://agentmods.dev/badge/agents/dragoon0x/everything-design-taste/performance-reviewer.svg" alt="Measured on agentmods" height="20"></a>
Per session 20 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 186 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.
Origin original 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 $0.00020 $0.00186
Opus 5 $0.00010 $0.00093
Sonnet 5 $0.00004 $0.00037
Haiku 4.5 $0.00002 $0.00019

Measured 8d ago against content hash 95e272639427, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

performance-reviewer 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 8d 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/performance-reviewer.md · 26 lines

What it actually says

You review frontend performance.

What You Check

  1. Largest Contentful Paint (LCP) < 2.5s.
  2. First Input Delay (FID) < 100ms.
  3. Cumulative Layout Shift (CLS) < 0.1.
  4. Image optimization (format, size, lazy loading).
  5. Font loading strategy.
  6. JavaScript bundle size.
  7. Critical rendering path.
  8. Caching strategy.
  9. Perceived performance (skeleton screens, progressive loading).
  10. Mobile performance (3G simulation).

Output: Performance Audit

Core Web Vitals

Loading Strategy Issues

Asset Optimization

Recommendations by Impact

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. 8d ago First seen · 26 lines · 20 tokens per session scan A 95e272639427

Subscribe to this mod's changes

performance-reviewer is an agent published in the GitHub repository Dragoon0x/everything-design-taste (11 stars, last pushed 4mo ago), licensed MIT. It adds 20 tokens to every session and 186 once invoked, about $0.0001 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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