performance-reviewer

performance-reviewer is an agent for Claude Code from morodomi/tdd-skills. It costs 30 tokens per session (355 once invoked), scanned A, original, MIT.

A review agent that looks for code likely to waste time or memory, including inefficient algorithms, repeated database or API calls, and leaks.

In plain words
What is it for?
Inspect loops, data access, large-data processing, caching, and memory behavior, report affected locations, and record recurring project-specific performance patterns.
Why use it?
It helps find slow paths and excessive resource use before they become user-facing problems.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the tdd-core plugin — 13 skills, 14 agents shipped together

Good fit Inspect loops, data access, large-data processing, caching, and memory behavior, report affected locations, and record recurring project-specific performance patterns.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/morodomi/tdd-skills/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/morodomi/tdd-skills

Made for: Claude Code.

Or install tdd-core, the plugin that ships this one along with the rest of its 13 skills, 14 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/morodomi/tdd-skills/performance-reviewer/github.svg)](https://agentmods.dev/agents/morodomi/tdd-skills/performance-reviewer)
Your own site
<a href="https://agentmods.dev/agents/morodomi/tdd-skills/performance-reviewer"><img src="https://agentmods.dev/badge/agents/morodomi/tdd-skills/performance-reviewer/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-reviewer

Your own site · 80×15
<a href="https://agentmods.dev/agents/morodomi/tdd-skills/performance-reviewer"><img src="https://agentmods.dev/badge/agents/morodomi/tdd-skills/performance-reviewer.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 355 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 $0.00030 $0.00355
Opus 5 $0.00015 $0.00178
Sonnet 5 $0.00006 $0.00071
Haiku 4.5 $0.00003 $0.00036

Measured 8d ago against content hash 5f971f31671f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, 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.

plugins/tdd-core/agents/performance-reviewer.md · 45 lines

What it actually says

Performance Reviewer

コードのパフォーマンスを検証するレビューエージェント。

検証観点

  1. アルゴリズム効率: O記法、不要なループ、重複処理
  2. N+1問題: データベースクエリ、API呼び出し
  3. メモリ使用: 大量データ処理、メモリリーク、キャッシュ

出力形式

{
  "confidence": 0-100,
  "issues": [
    {
      "severity": "critical|important|optional",
      "message": "問題の説明",
      "file": "ファイルパス",
      "line": 行番号,
      "suggestion": "修正提案"
    }
  ]
}

信頼スコア基準

  • 80-100: BLOCK(修正必須)
  • 50-79: WARN(警告)
  • 0-49: PASS(問題なし)

Memory

レビューで発見したパフォーマンス問題のパターンを agent memory に記録せよ。 記録対象: N+1問題の発生箇所、ボトルネックパターン、プロジェクト固有のパフォーマンス特性。 記録しないもの: 一般的なパフォーマンス知識、個別の最適化詳細。

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 · 45 lines · 30 tokens per session scan A 5f971f31671f

Subscribe to this mod's changes

performance-reviewer is an agent published in the GitHub repository morodomi/tdd-skills (8 stars, last pushed 6mo ago), licensed MIT. It adds 30 tokens to every session and 355 once invoked, about $0.0002 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.