dev-screen-spec

A tool that creates and updates screen specification documents from source code or acceptance criteria. These documents describe individual screens and are saved as Markdown files.

In plain words
What is it for?
It helps generate an initial screen catalogue, update only screens affected by a Git change, or create screen specifications from planned acceptance requirements.
Why use it?
It translates code changes into updates to the affected screens, so testing plans do not have to be rebuilt manually after every change.

Skill for Claude CodeCodex

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 skills/classmethod/tsumiki/dev-screen-spec
Any agent
npx skills add classmethod/tsumiki --skill dev-screen-spec
Clone the repo
git clone --depth 1 https://github.com/classmethod/tsumiki

Made for: Claude Code, Codex.

Per session 98 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 8,060 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 1 finding. Scan, not verified.
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 $0.00098 $0.08060
Opus 5 $0.00049 $0.04030
Sonnet 5 $0.00020 $0.01612
Haiku 4.5 $0.00010 $0.00806

Measured 2d ago against content hash 894a39765a5a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade C, and why

dev-screen-spec scanned grade C with 1 finding 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 2d 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.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

rm -rf "$(git rev-parse --show-toplevel)/tmp/screen-spec/"
skills/dev-screen-spec/SKILL.md · 551 lines

How it starts

The opening of the file, as written. The whole thing — 551 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Dev Screen Spec

ソースコードから画面仕様ドキュメント(Screen Spec)を生成・差分更新するスキル。 docs/dev/screen-specs/ 配下に画面ごとの Markdown with frontmatter 形式で出力する。 webtest 計画の差分更新パイプラインにおいて、ソースコード変更を画面・機能単位の変更に翻訳する中間レイヤーとして機能する。

前提知識

dev-* スキルフロー内の位置

[ソースコード変更]  ← dev-impl / 手作業 / 何でも
       │
       │  git diff (last_synced_commit → HEAD)
       ▼
[dev-screen-spec]   ← 手動実行(本スキル)
       │
       │  画面仕様の差分
       ▼
[dev-webtest-plan]  ← 既存の受け入れ要件 + 画面仕様を入力に
       │
       ▼
[dev-webtest]       ← 既存のまま

引数フォーマット

/dev-screen-spec              # 自動判定(初回 or 差分更新)
/dev-screen-spec init         # 強制的に初回生成モード
/dev-screen-spec update       # 強制的に差分更新モード
/dev-screen-spec update login # 特定画面のみ更新
/dev-screen-spec from-plan              # AC変更のある plan を自動検出
/dev-screen-spec from-plan <plan-name>  # 特定の plan を明示指定

モード自動判定

docs/dev/screen-specs/_index.md の存在で自動判定する(ユーザー質問不要):

モード 判定条件 特徴
from-plan 引数が from-plan で始まる 受け入れ条件(AC + plan.md)から画面仕様を生成。ソースコード不要
初回生成 _index.md が存在しない、または引数 init ソースコード全体を解析して一括生成
差分更新 _index.md が存在する、または引数 update git diff で影響画面のみ更新

サブエージェント制約(重要)

サブエージェントは Task ツールを使用できない(ネスト不可のアーキテクチャ制約)。そのため:

  • コード探索は Glob/Grep/Read を直接使用する
  • TodoWrite は使用しない
  • サブエージェントに渡すのはファイルパスのみ。サブエージェントが自分で Read する

コンテキスト管理戦略

メインコンテキストの肥大化を防ぐため、中間ファイルとパス参照 を使用する:

  • メインエージェントはファイルの全文を Read しない(パス存在確認・Grep での部分情報取得のみ)
  • サブエージェントに渡すのはファイルパス。サブエージェントが自分で Read する
  • Phase 間のデータ受け渡しは中間ファイル経由(tmp/screen-spec/
  • サブエージェントの返却はマーカー+ファイルパス+行数のみ

中間ファイル

tmp/screen-spec/
├── explore-routes.md          # Phase 1: ルーティング探索結果
├── explore-pages.md           # Phase 1: ページコンポーネント一覧
├── group-<group-name>.md      # Phase 3: グループサマリー(初回生成)
├── diff-<screen_id>.md        # 差分更新 Phase 2: 各画面の変更サマリー
├── sync-<screen_id>.md        # 差分更新 Phase 1.5: from-plan ソース同期分析
└── from-plan/
    └── screen-analysis.md     # from-plan Phase 2: 画面構成分析結果

信号機

信号 基準
🔵 ソースコードから直接読み取れた情報(HTML要素、バリデーション属性、ルーティング定義等)
🟡 ソースコードから推測した情報(コンポーネント名から画面名を推定、import関係からの推論等)
🔴 AI推論補完(ソースに明示されていないが、一般的なWebアプリとして必要と判断した項目)

Read the full file on GitHub · 551 lines

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. 2d ago First seen · 551 lines · 98 tokens per session scan C 894a39765a5a

Subscribe to this mod's changes

dev-screen-spec is a skill published in the GitHub repository classmethod/tsumiki (974 stars, last pushed 25d ago), licensed MIT. It adds 98 tokens to every session and 8,060 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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