An offline workflow for creating and editing draw.io diagrams from structured YAML files. Draw.io is a diagramming application used for architecture maps, flowcharts, network layouts, UML, and other technical visuals.

Use it for software architecture, network topologies, process maps, organization charts, UML and database diagrams, Mermaid or CSV conversions, and existing .drawio files.

It gives you a repeatable way to build, convert, validate, import, and export diagrams without relying on an online editor. It also keeps diagram structure separate from the final image.

drawio — Skill for Claude Code and Codex by bahayonghang

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 bahayonghang/drawio-skills --skill drawio

Clone the repo

git clone --depth 1 https://github.com/bahayonghang/drawio-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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/bahayonghang/drawio-skills/drawio/github.svg)](https://agentmods.dev/skills/bahayonghang/drawio-skills/drawio)

Your own site

<a href="https://agentmods.dev/skills/bahayonghang/drawio-skills/drawio"><img src="https://agentmods.dev/badge/skills/bahayonghang/drawio-skills/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/bahayonghang/drawio-skills/drawio"><img src="https://agentmods.dev/badge/skills/bahayonghang/drawio-skills/drawio.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 84 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,739 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. Third-party audits

Socket pass 18 Apr 2026
Snyk pass 18 Apr 2026
NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

medium Rogue Agent · line 78
Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.

Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.

How audits are shown

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.

Model	Per session	Once invoked
Fable 5.1	$0.00084	$0.03739
Opus 5	$0.00042	$0.01869
Sonnet 5	$0.00017	$0.00748
Haiku 4.5	$0.00008	$0.00374

Measured 10d ago against content hash 8f81c64e5bfe, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

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 10d 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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

drawio — 91% identical, 7 lines differ

skills/drawio/SKILL.md · 163 lines

How it starts

The opening of the file, as written. The whole thing — 163 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Draw.io Base Skill

Create, edit, validate, replicate, import, and export draw.io diagrams through a YAML-first offline workflow. It is the single maintained base for sibling overlays and owns the local CLI, schemas, references, themes, palettes, examples, style presets, and export helpers.

Scope

Use this base skill for general draw.io work: software/system architecture; network topologies and infrastructure maps; flowcharts, swimlanes, process maps, and org charts; UML class/sequence/state/ER; Mermaid and CSV conversion; structured redraw and non-academic replication; formula-bearing technical diagrams; .drawio import, sidecar export, and local validation.

For paper, thesis, IEEE, journal, manuscript, or publication-ready figure requests, route to the sibling drawio-academic-skills overlay; the base does not apply academic publication gates. Without the overlay, render the local YAML bundle but report that overlay policy was not applied.

Runtime Stack

Use the lightest path that satisfies the request:

Offline Authoring Path (default) — the YAML spec generates the final .drawio plus the default delivered image, a 300dpi PNG via draw.io Desktop (standalone SVG fallback).
Desktop-Enhanced Export — 300dpi PNG default, plus PDF/JPG or embedded .drawio.svg on explicit request.
Live Refinement Backend (optional) — browser refinement provider only; the offline bundle remains canonical. Provisioned by the tracked .mcp.json (pinned @next-ai-drawio/[email protected], fetched over the network by npx; see references/docs/mcp-tools.md); offline authoring never reads it.
Direct XML Exception — tiny one-off or raw mxGraph handoff when exact XML control is the real requirement.

The optional MCP/live backend is a refinement provider only. Never required for normal authoring, editing, import, replication, or export.

Task Routing

Choose the route first, then load only that route's references. All paths below live under references/; the reusable YAML example catalog is references/examples/README.md.

Read the full file on GitHub · 163 lines

Files

What ships with it

60 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.

10d ago First seen · 163 lines · 84 tokens per session scan A 8f81c64e5bfe

Subscribe to this mod's changes

drawio is a skill published in the GitHub repository bahayonghang/drawio-skills (281 stars, last pushed 2d ago), licensed MIT. It adds 84 tokens to every session and 3,739 once invoked, about $0.0004 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 2026-08-30.

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