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.
npx skills add Goodsmileduck/claude-registry --skill drawio-diagramminggit clone --depth 1 https://github.com/Goodsmileduck/claude-registryWrote 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/goodsmileduck/claude-registry/drawio-diagramming)<a href="https://agentmods.dev/skills/goodsmileduck/claude-registry/drawio-diagramming"><img src="https://agentmods.dev/badge/skills/goodsmileduck/claude-registry/drawio-diagramming/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/goodsmileduck/claude-registry/drawio-diagramming"><img src="https://agentmods.dev/badge/skills/goodsmileduck/claude-registry/drawio-diagramming.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00073 | $0.03219 |
| Opus 5 | $0.00036 | $0.01610 |
| Sonnet 5 | $0.00015 | $0.00644 |
| Haiku 4.5 | $0.00007 | $0.00322 |
Grade A, and why
drawio-diagramming 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.
How it starts
The opening of the file, as written. The whole thing — 252 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Draw.io MCP Server
Architecture / HLA diagrams (infra, Kubernetes, topology)
For polished architecture / High-Level-Architecture diagrams (cloud infra, GKE/k8s
clusters, network topology) — not generic flowcharts — follow the dedicated method:
read references/architecture-diagrams.md and
generate with scripts/gen_arch_drawio.py
(box / icon / note / edge / write_mxfile helpers).
Headline rules (full detail in the reference): derive every node from real source code
(Terraform/Helm/manifests) before drawing; generate via the Python helper (consistent
coords, edges by ID) rather than hand-XML; 64×54 stencil icons (mxgraph.kubernetes.icon
/ mxgraph.gcp2.*) colored by role; semantic edge colors with a legend; always set
explicit exit/entry anchors + waypoints (never target box centers); comb-bus a hub
into a single adjacent column; ladder/rail parallel edges ≥13px apart; short centered
container titles with qualifiers pushed into dashed notes; keep notes/legend out of edge
channels; leave ~40px breathing room at container bottoms. The rest of this file covers
the underlying MCP tools and XML mechanics those diagrams build on.
The official draw.io MCP (Model Context Protocol) server that enables LLMs to open and create diagrams in the draw.io editor.
Repository Structure
mcp-app-server/— MCP App server (renders diagrams inline in chat via iframe). Hosted athttps://mcp.draw.io/mcp. Can also be self-hosted via Node.js or Cloudflare Workers.mcp-tool-server/— Original MCP tool server (stdio-based, opens browser). Published as@drawio/mcpon npm.project-instructions/— Claude Project instructions (no MCP required, no install).skill-cli/— Claude Code skill (generates native.drawiofiles, opens in desktop app). No MCP required.
Each subdirectory has its own CLAUDE.md with implementation details.
MCP App Server Tool
create_diagram
What ships with it
2 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.
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 · 252 lines · 73 tokens per session scan A 593742ef02c5
drawio-diagramming is a skill published in the GitHub repository Goodsmileduck/claude-registry (1 stars, last pushed 1mo ago), licensed MIT. It adds 73 tokens to every session and 3,219 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 2026-08-31.
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