performance-expert

performance-expert is an agent for Claude Code from kirich1409/claude-global-settings. It costs 102 tokens per session (665 once invoked), scanned A, original, no licence file.

A code and plan reviewer focused on speed, resource use, network activity, background work, and battery life. It also suggests ways to measure performance.

In plain words
What is it for?
Use it to review code for repeated database queries, missing pagination, blocked UI work, coroutine leaks, excessive UI updates, inefficient networking, and poor background or battery behaviour.
Why use it?
It helps find slow operations, unnecessary work, UI freezes, memory leaks, and battery-draining behaviour before they reach users.

Agent for Claude Code

Written for Claude Code: effort in frontmatter. Also seen: model 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 agents/kirich1409/claude-global-settings/performance-expert
Clone the repo
git clone --depth 1 https://github.com/kirich1409/claude-global-settings

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-expert

README.md
[![agentmods](https://agentmods.dev/badge/agents/kirich1409/claude-global-settings/performance-expert.svg)](https://agentmods.dev/agents/kirich1409/claude-global-settings/performance-expert)
Your own site
<a href="https://agentmods.dev/agents/kirich1409/claude-global-settings/performance-expert"><img src="https://agentmods.dev/badge/agents/kirich1409/claude-global-settings/performance-expert.svg" alt="Measured on agentmods" height="20"></a>
Per session 102 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 665 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 $0.00102 $0.00665
Opus 5 $0.00051 $0.00332
Sonnet 5 $0.00020 $0.00133
Haiku 4.5 $0.00010 $0.00067

Measured 6d ago against content hash 8c7643de1ca3, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

performance-expert 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.

agents/performance-expert.md · 49 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 · 49 lines · 102 tokens per session scan A 8c7643de1ca3

Subscribe to this mod's changes

performance-expert is an agent published in the GitHub repository kirich1409/claude-global-settings (20 stars, last pushed 1mo ago), with no licence file. It adds 102 tokens to every session and 665 once invoked, about $0.0005 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.

Related

Other agents, from other repositories

swiftui-performance-analyzer

Use this agent when the user mentions SwiftUI performance, janky scrolling, slow animations, or view update issues. Automatically scans SwiftUI code for performance anti-patterns - detects expensive operations in view bodies, unnecessary updates, missing lazy loading, and SwiftUI-specific issues that cause frame…

CharlesWiltgen/Axiom · 155 tokens

Minimal Change Engineer

Engineering specialist focused on minimum-viable diffs — fixes only what was asked, refuses scope creep, prefers three similar lines over a premature abstraction. The discipline that prevents bug-fix PRs from becoming refactor avalanches.

SHAdd0WTAka/Zen-Ai-Pentest · 50 tokens

predictive-analyst

Precognition agent. Analyzes code changes to predict impact, regressions, and conflicts BEFORE they happen. Uses dependency graphs and historical data.

softspark/ai-toolkit · 35 tokens

error-handling-reviewer

Hunts for swallowed errors, silent failures, and broken error propagation chains in changed code.

OutSystems/outsystems-mcp · 24 tokens

silent-failure-hunter

Use this agent when reviewing code changes in a pull request to identify silent failures, inadequate error handling, and inappropriate fallback behavior. Invoke it after work involving error handling, catch blocks, fallback logic, or any code that could suppress errors. See "When to invoke" in the agent body for…

nota-america/forgecat-agent-profiles · 67 tokens

fec-ui-checker

Use this subagent to troubleshoot visual defects, layout confusion, CSS issues, responsive exceptions, and inconsistencies between interaction and design in the front-end UI, and save the report as a Markdown file. Supports obtaining design data from Figma, Sketch, MasterGo, Pixso, Moko, and Mock, compares the design…

bovinphang/frontend-craft · 0 tokens