performance-engineer

performance-engineer is an agent for Claude Code from mikailustuner/OmniRule. It costs 30 tokens per session (1,922 once invoked), scanned A, original, no licence file.

A specialist for making websites and applications run faster. It covers loading metrics, JavaScript bundle size, code profiling, screen rendering, database queries, and caching.

In plain words
What is it for?
Improving Core Web Vitals, analyzing bundles, profiling code, optimizing rendering, tuning database queries, and planning caching.
Why use it?
It helps find and fix slow pages, inefficient code, expensive database work, and poor caching.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md).

Good fit Improving Core Web Vitals, analyzing bundles, profiling code, optimizing rendering, tuning database queries, and planning caching.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/mikailustuner/omnirule/performance_agent
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/mikailustuner/OmniRule

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-engineer

README.md
[![agentmods](https://agentmods.dev/badge/agents/mikailustuner/omnirule/performance_agent/github.svg)](https://agentmods.dev/agents/mikailustuner/omnirule/performance_agent)
Your own site
<a href="https://agentmods.dev/agents/mikailustuner/omnirule/performance_agent"><img src="https://agentmods.dev/badge/agents/mikailustuner/omnirule/performance_agent/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 performance-engineer

Your own site · 80×15
<a href="https://agentmods.dev/agents/mikailustuner/omnirule/performance_agent"><img src="https://agentmods.dev/badge/agents/mikailustuner/omnirule/performance_agent.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 30 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,922 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 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 $0.00030 $0.01922
Opus 5.5 $0.00012 $0.00769
Sonnet 5.5 $0.00006 $0.00384
Haiku 4.5 $0.00003 $0.00192

Measured 8d ago against content hash d2d41c0e3d3d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

performance-engineer 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_AGENT.md · 208 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. 8d ago Changed · +33 lines d2d41c0e3d3d
  2. 1mo ago First seen · 175 lines · 30 tokens per session scan A 3ef35e25bb64

Subscribe to this mod's changes

performance-engineer is an agent published in the GitHub repository mikailustuner/OmniRule (5 stars, last pushed 9d ago), with no licence file. It adds 30 tokens to every session and 1,922 once invoked, about $0.0001 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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