diagram-drawio

diagram-drawio is a skill for Claude Code from lc-semba-ryuichiro/semba-claude-plugins. It costs 147 tokens per session (3,063 once invoked), scanned A, original, MIT.

A guide for creating diagrams in draw.io, a tool for making editable technical diagrams. It covers flowcharts, sequence diagrams, architecture diagrams, database relationship diagrams, and AWS diagrams.

In plain words
What is it for?
Use it when planning or documenting software systems, data structures, integrations, or step-by-step processes for technical or non-technical readers.
Why use it?
It helps turn complex systems or processes into diagrams that are easier to read. It also provides consistent rules for arrows, colours, fonts, spacing, and diagram detail.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Part of the diagram-drawio plugin — 1 skill, 1 command shipped together

Good fit Use it when planning or documenting software systems, data structures, integrations, or step-by-step processes for technical or non-technical readers.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/lc-semba-ryuichiro/semba-claude-plugins/diagram-drawio
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 lc-semba-ryuichiro/semba-claude-plugins --skill diagram-drawio
Clone the repo
git clone --depth 1 https://github.com/lc-semba-ryuichiro/semba-claude-plugins

Made for: Claude Code.

Or install diagram-drawio, the plugin that ships this one along with the rest of its 1 skill, 1 command.

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 diagram-drawio

README.md
[![agentmods](https://agentmods.dev/badge/skills/lc-semba-ryuichiro/semba-claude-plugins/diagram-drawio/github.svg)](https://agentmods.dev/skills/lc-semba-ryuichiro/semba-claude-plugins/diagram-drawio)
Your own site
<a href="https://agentmods.dev/skills/lc-semba-ryuichiro/semba-claude-plugins/diagram-drawio"><img src="https://agentmods.dev/badge/skills/lc-semba-ryuichiro/semba-claude-plugins/diagram-drawio/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 diagram-drawio

Your own site · 80×15
<a href="https://agentmods.dev/skills/lc-semba-ryuichiro/semba-claude-plugins/diagram-drawio"><img src="https://agentmods.dev/badge/skills/lc-semba-ryuichiro/semba-claude-plugins/diagram-drawio.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 147 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,063 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 $0.00147 $0.03063
Opus 5 $0.00073 $0.01532
Sonnet 5 $0.00029 $0.00613
Haiku 4.5 $0.00015 $0.00306

Measured 12d ago against content hash c490333ccc52, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

diagram-drawio 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 12d 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/diagram-drawio/skills/diagram-drawio/SKILL.md · 291 lines

How it starts

The opening of the file, as written. The whole thing — 291 lines — stays where its author put it; the contents beside it link to each section on GitHub.

draw.io図作成ガイドライン

目次

事前準備チェックリスト

図を作成する前に以下を確認する。

  • 目的の明確化: この図で何を伝えたいか?
  • 対象者の特定: 誰が見る図か?(技術者 / 非技術者 / 経営層)
  • 抽象度の決定: どの程度の詳細が必要か?
  • 図の種類選択: 目的に最も合う図の種類は?

図の設計原則

段階的開示(Progressive Disclosure)

複雑なシステムは階層化して表現する。

Context図(全体俯瞰)
    ↓
System図(主要コンポーネント)
    ↓
Component図(詳細構成)
    ↓
Sequence図(処理フロー)

図の種類と用途

図の種類 用途 対象者
Context図 システム境界と外部連携 経営層、PM
アーキテクチャ図 技術構成の全体像 技術者、アーキテクト
シーケンス図 処理の時系列フロー 開発者
フローチャート 業務/処理フロー 全員
ER図 データ構造 開発者、DBA

シンプルさの原則

  • 1つの図に詰め込みすぎない
  • 1図1目的を心がける
  • 詳細は別図に分離する

凡例ルール

線のスタイル

スタイル 意味 XMLスタイル
実線 同期通信、直接呼び出し dashed=0
破線 非同期通信、イベント dashed=1
太線 主要フロー strokeWidth=2

矢印の方向

  • 矢印はデータや制御の流れ方向を示す。
  • 双方向は避け、単方向矢印×2で表現

色の意味(統一ルール)

意味
青系 エントリーポイント、API、フロントエンド
緑系 処理、サービス、バックエンド
黄系 データ、ストレージ、条件分岐
赤系 エラー、警告、重要
紫系 外部連携、サードパーティ
グレー 境界、グループ、ベース

メタデータ

Read the full file on GitHub · 291 lines

Files

What ships with it

3 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. 12d ago First seen · 291 lines · 147 tokens per session scan A c490333ccc52

Subscribe to this mod's changes

diagram-drawio is a skill published in the GitHub repository lc-semba-ryuichiro/semba-claude-plugins (1 stars, last pushed 5mo ago), licensed MIT. It adds 147 tokens to every session and 3,063 once invoked, about $0.0007 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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