Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/xiaohei-info/oh-my-multicanpx agentmods add skills/xiaohei-info/oh-my-multica/diagram-drawioWrote 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.
[](https://agentmods.dev/skills/xiaohei-info/oh-my-multica/diagram-drawio)<a href="https://agentmods.dev/skills/xiaohei-info/oh-my-multica/diagram-drawio"><img src="https://agentmods.dev/badge/skills/xiaohei-info/oh-my-multica/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.
<a href="https://agentmods.dev/skills/xiaohei-info/oh-my-multica/diagram-drawio"><img src="https://agentmods.dev/badge/skills/xiaohei-info/oh-my-multica/diagram-drawio.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to high
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 →
- high Prompt Injection · line 175 Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.Fix: Audit all comments and invisible characters. Remove any instructions that direct the agent to perform unauthorized actions. Use plain, reviewable content.
- medium Rogue Agent · line 138 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.
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 | $0.00120 | $0.08069 |
| Opus 5.5 | $0.00048 | $0.03228 |
| Sonnet 5.5 | $0.00024 | $0.01614 |
| Haiku 4.5 | $0.00012 | $0.00807 |
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 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.
How it starts
The opening of the file, as written. The whole thing — 470 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Draw.io Diagrams
Overview
Generate .drawio XML files and export to PNG/SVG/PDF/JPG locally using the native draw.io desktop app CLI.
Supported formats: PNG, SVG, PDF, JPG — no browser automation needed.
PNG, SVG, and PDF exports support --embed-diagram (-e) — the exported file contains the full diagram XML, so opening it in draw.io recovers the editable diagram. Use double extensions (name.drawio.png) to signal embedded XML.
Bundled resources
When the workflow references one of these, read it on demand — none of them need to be in context up front.
| File | Read it when |
|---|---|
references/diagram-types.md |
The user names a specific diagram type (ERD, UML class, sequence, architecture, ML/DL, flowchart) |
references/style-presets.md |
The user asks to learn / save / list / set-default / delete a style preset, or you've resolved an active preset and need the application rules |
references/style-extraction.md |
You're inside the Learn flow and need the extraction procedure (called from style-presets.md) |
references/format-comparison.md |
Choosing between drawio-skill, architecture-diagram, and excalidraw for a given task; multi-format workflow; Obsidian compatibility per format |
references/troubleshooting.md |
An export fails, vision rejects a PNG, or a rendering looks wrong |
references/obsidian-integration.md |
Embedding diagrams in Obsidian vault notes, architecture-from-doc patterns, cloud-platform color conventions |
scripts/repair_png.py |
After every -e PNG export — fixes draw.io's truncated IEND chunk (issue #8) |
scripts/encode_drawio_url.py |
The CLI is unavailable and you need a browser-fallback diagrams.net URL |
Prerequisites
The draw.io desktop app must be installed and the CLI accessible:
macOS sandbox / sandbox isolation note (e.g., codex.app): In some sandboxed macOS environments, invoking the draw.io desktop CLI (even draw.io --version) can crash the draw.io process or produce no output. If that happens, treat the CLI as unavailable in this sandbox isolation — do not keep retrying inside the sandbox. Prefer a non-sandboxed host environment (outside sandbox isolation) for any CLI export work, or use the browser fallback / XML-only outputs.
What ships with it
12 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.
- references/diagram-types.md 5.6 KB
- references/format-comparison.md 3.4 KB
- references/obsidian-integration.md 4.0 KB
- references/style-extraction.md 17 KB
- references/style-presets.md 9.6 KB
- references/troubleshooting.md 2.5 KB
- scripts/encode_drawio_url.py 1.1 KB runs code
- scripts/repair_png.py 1.1 KB runs code
- styles/built-in/corporate.json 1.4 KB
- styles/built-in/default.json 1.4 KB
- styles/built-in/handdrawn.json 1.4 KB
- styles/schema.json 3.9 KB
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.
- 1mo ago First seen · 470 lines · 120 tokens per session scan A 5a210df27bf0
diagram-drawio is a skill published in the GitHub repository xiaohei-info/oh-my-multica (37 stars, last pushed 17d ago), licensed MIT. It adds 120 tokens to every session and 8,069 once invoked, about $0.0005 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 2026-08-30.
Other skills, from other repositories
wireframe
Produce low-fidelity black-and-white UI wireframes as SVGs or viewer pages. Use when asked to wireframe, sketch a screen, draft a layout, make a low-fi mockup, or publish wireframes.
design-critique
Give a structured product design critique — user job clarity, hierarchy, affordance, error states, accessibility, and consistency — focused on what to change, in what order, and why.
paperclip-capsules
Generate, implement, or review Paperclip capsule visuals. Use for capsule art, agent capsules, heartbeat status capsules, identicons, capsule banks, or brand-usage validation.
frontend-design
Produce intentional, responsive, accessible UI work and perform visual QA instead of generic component assembly.
ui-mockup
Create UI mockups at three fidelity levels — ASCII wireframes for quick iteration, standalone HTML mockups for delivery with requirements, and live prototypes for interaction testing.
tutti-ui-system
Use when working with @tutti-os/ui-system components, replacing local UI with shared components, querying component ids or metadata, promoting UI into shared base or business components, or maintaining UI-system storyboard inventory.