codex-harness: Skill for Claude Code

.codex/skills/parallel-workflows/SKILL.md

parallel-workflows is a skill for Claude Code, Codex from Chachamaru127/codex-harness. It costs 47 tokens per session (2,102 once invoked), scanned A, original, MIT.

A workflow guide for finding tasks that can run at the same time, such as checking several folders or running tests and code checks together.

In plain words
What is it for?
Use it when asking to run work in parallel, together, or all at once, including repository analysis, checks, and independent feature work.
Why use it?
It helps avoid waiting through independent tasks one after another while keeping tasks that depend on earlier results in the correct order.

Skill for Claude CodeCodex

Written for Claude Code and Codex: allowed-tools in frontmatter, but also installed under .codex/. Also seen: mentions Claude Code.

This is Chachamaru127/codex-harness's own configuration. It tells Claude Code and Codex how to work on codex-harness itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything codex-harness configures →

Reuse

Borrowing it

Nothing to install: this file belongs to Chachamaru127/codex-harness. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/Chachamaru127/codex-harness/main/.codex/skills/parallel-workflows/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/Chachamaru127/codex-harness

Made for: Claude Code, Codex.

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 parallel-workflows

README.md
[![agentmods](https://agentmods.dev/badge/skills/chachamaru127/codex-harness/parallel-workflows/github.svg)](https://agentmods.dev/skills/chachamaru127/codex-harness/parallel-workflows)
Your own site
<a href="https://agentmods.dev/skills/chachamaru127/codex-harness/parallel-workflows"><img src="https://agentmods.dev/badge/skills/chachamaru127/codex-harness/parallel-workflows/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 parallel-workflows

Your own site · 80×15
<a href="https://agentmods.dev/skills/chachamaru127/codex-harness/parallel-workflows"><img src="https://agentmods.dev/badge/skills/chachamaru127/codex-harness/parallel-workflows.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 47 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,102 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 $0.00047 $0.02102
Opus 5.5 $0.00019 $0.00841
Sonnet 5.5 $0.00009 $0.00420
Haiku 4.5 $0.00005 $0.00210

Measured 1mo ago against content hash 3eb688e52cac, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

parallel-workflows 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 1mo 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.

.codex/skills/parallel-workflows/SKILL.md · 284 lines

How it starts

The opening of the file, as written. The whole thing — 284 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Parallel Workflows Skill

複数タスクの並列実行を最適化するスキル。 Task ツールを活用して、独立したタスクを同時に処理します。


トリガーフレーズ

このスキルは以下のフレーズで自動起動します:

  • 「並列で実行して」「同時にやって」
  • 「まとめてやって」「一気にやって」
  • 「効率的にやって」「速くやって」
  • "run in parallel", "do these together"

関連コマンド

  • /work - Plans.md のタスクを実行(並列実行対応)

概要

Claude Code は複数のタスクを並列実行できます。 このスキルは、どのタスクが並列化可能かを判断し、最適な実行計画を立てます。


並列化パターン

パターン1: 複数ファイルの同時分析

使用場面: コードレビュー、構造把握

Task tool を並列起動:
- agent1: src/components/ を分析
- agent2: src/lib/ を分析
- agent3: src/app/ を分析

VibeCoder向け言い方:

「このプロジェクトの構造を教えて」
→ 自動的に並列分析を実行

パターン2: テストとビルドの同時実行

使用場面: CI/CD、品質チェック

並列実行:
- npm run lint
- npm run type-check
- npm run test

直列実行(依存あり):
- npm run build(上記が全て成功後)

VibeCoder向け言い方:

「チェックして」
→ lint, type-check, test を並列実行

パターン3: 複数機能の同時実装

使用場面: 独立した機能の開発

Plans.md:
- [ ] ヘッダーコンポーネント作成
- [ ] フッターコンポーネント作成
- [ ] サイドバーコンポーネント作成

→ 3つのTask agentを並列起動

VibeCoder向け言い方:

「レイアウトを全部作って」
→ 独立したコンポーネントを並列実装

判定ロジック

並列化可能な条件

  1. ファイル依存なし: 同じファイルを編集しない
  2. データ依存なし: 出力が他の入力にならない
  3. 順序依存なし: 実行順序が結果に影響しない

並列化不可の例

❌ 並列化不可:
1. API クライアント作成
2. API クライアントを使うコンポーネント作成
→ 2は1の出力に依存

✅ 並列化可能:
1. ログインページ作成
2. 会員登録ページ作成
→ 互いに独立

実装ガイド

Task ツールを使った並列実行

// 並列実行パターン
const tasks = [
  { name: "タスクA", prompt: "..." },
  { name: "タスクB", prompt: "..." },
  { name: "タスクC", prompt: "..." }
];

// 全てのタスクを run_in_background: true で起動
// TaskOutput で結果を収集

統合レポートの生成

各タスク完了後、以下の形式でレポートを生成:

## 📊 並列タスク実行レポート

**実行日時**: {{timestamp}}
**タスク数**: {{count}}件(並列実行)
**所要時間**: {{duration}}秒

### 完了タスク

| # | タスク | ステータス | 所要時間 | 成果物 |
|---|-------|----------|---------|-------|
{{#each tasks}}
| {{index}} | {{name}} | {{status}} | {{duration}}秒 | {{output}} |
{{/each}}

### 変更ファイル一覧

{{#each files}}
- `{{path}}` ({{action}})
{{/each}}

実行例

例1: プロジェクト分析

ユーザー: 「このプロジェクトについて教えて」

Claude Code:
🔍 プロジェクトを並列分析中...

├── [Agent 1] 構造分析中...
├── [Agent 2] 依存関係チェック中...
└── [Agent 3] コード品質分析中...

完了!

📁 プロジェクト概要:
- フレームワーク: Next.js 14
- 主要ディレクトリ: 15個
- ファイル数: 87個
- 依存パッケージ: 23個
- コード品質: 良好(lint警告: 3件)

Read the full file on GitHub · 284 lines

Files

What ships with it

5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 1mo ago First seen · 284 lines · 47 tokens per session scan A 3eb688e52cac

Subscribe to this mod's changes

parallel-workflows is a skill published in the GitHub repository Chachamaru127/codex-harness (2 stars, last pushed 8mo ago), licensed MIT. It adds 47 tokens to every session and 2,102 once invoked, about $0.0002 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.