engineer-software-design

engineer-software-design is a skill for Claude Code, Codex from eaglesakura/agent-skills. It costs 171 tokens per session (1,161 once invoked), scanned A, original, MIT.

A detailed software-design guide for turning requirements into concrete file changes, implementation steps, tests, and comments that a junior engineer can follow.

In plain words
What is it for?
Use it to create or update detailed design plans, file trees, code-level change proposals, and test plans.
Why use it?
It removes guesswork from implementation planning and exposes missing requirements before production code is changed.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to create or update detailed design plans, file trees, code-level…

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Install with agentmods
npx agentmods add skills/eaglesakura/agent-skills/engineer-software-design
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.

Any agent
npx skills add eaglesakura/agent-skills --skill engineer-software-design
Clone the repo
git clone --depth 1 https://github.com/eaglesakura/agent-skills

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 engineer-software-design

README.md
[![agentmods](https://agentmods.dev/badge/skills/eaglesakura/agent-skills/engineer-software-design.svg)](https://agentmods.dev/skills/eaglesakura/agent-skills/engineer-software-design)
Your own site
<a href="https://agentmods.dev/skills/eaglesakura/agent-skills/engineer-software-design"><img src="https://agentmods.dev/badge/skills/eaglesakura/agent-skills/engineer-software-design.svg" alt="Measured on agentmods" height="20"></a>
Per session 171 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,161 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 $0.00171 $0.01161
Opus 5 $0.00086 $0.00580
Sonnet 5 $0.00034 $0.00232
Haiku 4.5 $0.00017 $0.00116

Measured 6d ago against content hash 0f8af967f2c5, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

engineer-software-design 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.

packages/coding-xm3/.apm/skills/engineer-software-design/SKILL.md · 83 lines

What it actually says

エンジニア / 詳細設計

主題は どう実装するか を、ジュニアエンジニアが手を動かせる粒度で提案することである。 要件の洗い出しそのものは engineer-software-requirement の役目である。

いつ使うか

  • 要件(または要件セクション付き計画)があり、実装差分・手順が必要なとき
  • /coding.design や Plan の詳細設計フェーズ
  • 「ジュニアが作業可能」な計画へ落とし込むとき

要件が曖昧なまま詳細設計だけ求められた場合は、先に不足要件を指摘するか engineer-software-requirement へ戻す。

アセットディレクトリ

  • ../../assets/
  • apm_modules/**/coding-xm3/.apm/assets/

入力

必須に近いもの

  • 要件定義、または要件が書かれた既存計画ファイル
  • 関連プロンプト(意図の補足)

計画ファイルの場所は workspace-agent-temporary.ai-agent/plan/)に従う。職能粒度は agent-job-description のジュニア定義に合わせる。

ガードレール

  • プロダクションコードは変更しない(計画ファイルとレビュー用 Markdown のみ)
  • 抽象方針のまま「あとは実装で」と逃げない。差分が書けないなら要件不足として止める

設計の基本

  • 関連 SKILL / ドキュメントを積極的にロードする
  • ドキュメントの DO / 推奨 に沿って提案する(DO NOT は example・ナレッジ側)

実行手順

ステップ1. 要件確認

  • 要件定義・計画・追加プロンプトから完了条件を把握する
  • 変更対象の箇所(パッケージ/レイヤー)を特定する
  • 要件が抽象的すぎる場合は詳細設計を進めず、不足点を返す

ステップ2. 関連ドキュメント確認

  • アーキテクチャ/レイヤー構成ドキュメント
  • コーディング規約
  • 既存の類似実装パターン(近い Usecase / Screen / Repository 等)
  • 不明点は推測で埋めず確認する

ステップ3. 変更提案

  • {assets}/coding/design.md(詳細設計テンプレート)をロードする(プロンプト指示による軽微なフォーマット差は可)
  • 具体的な変更差分を提示する(前後コードまたは同等の完全手順)
  • 編集対象すべてのファイルツリー([New] / [Del] / 変更はサフィックスなし)
  • 十分なコードコメント方針とテストコード提案
  • ステップ・バイ・ステップの実装手順

ステップ4. 出力前チェック

  • agent-job-description のジュニアが実装可能な粒度か
  • ファイルツリー・差分・手順・テストが揃っているか
  • {assets}/coding/design.md(詳細設計テンプレート)に沿って計画へ出力する

満たすべき品質

ジュニアが「方針に従って」ではなく、提示差分を写経・手順実行で完了できること。

  • ファイルツリーによる全体像
  • わかりやすい差分(疑似コードですべての分岐が追えるレベル以上)
  • 詳細なコードコメント
  • 十分なテスト提案(ケースと期待値)
  • 実装手順がチェックリストで分割されていること
Files

What ships with it

1 file 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. 6d ago First seen · 83 lines · 171 tokens per session scan A 0f8af967f2c5

Subscribe to this mod's changes

engineer-software-design is a skill published in the GitHub repository eaglesakura/agent-skills (2 stars, last pushed yesterday), licensed MIT. It adds 171 tokens to every session and 1,161 once invoked, about $0.0009 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.

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