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drawio-mcp CLAUDE.md

drawio-mcp CLAUDE.md is an instructions file for coding agents from jgraph/drawio-mcp. It costs 3,005 tokens per session, scanned A, original, Apache-2.0.

Project instructions for the draw.io MCP server, a tool that lets an AI open and create diagrams in the draw.io editor. They describe the repository layout, plugin manifests, and diagram-related tools.

In plain words
What is it for?
Use them when changing the draw.io server, its plugin marketplace entries, or features for creating and searching diagram shapes.
Why use it?
They help an agent find the right plugin files and use the diagram server consistently across supported coding assistants.

Instructions file

not rated 5.3k +14 1mo ago A scan 3,005 tokens original Apache-2.0
View the source file jgraph/drawio-mcp
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 instructions/jgraph/drawio-mcp/claude-md
Clone the repo
git clone --depth 1 https://github.com/jgraph/drawio-mcp

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.

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README.md
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Per session 3,005 This file is loaded in full into every session.
When invoked 3,005 The same file — it is already loaded in full.
Security scan A 0 findings. 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 $0.03005 $0.03005
Opus 5 $0.01503 $0.01503
Sonnet 5 $0.00601 $0.00601
Haiku 4.5 $0.00300 $0.00300

Measured 4d ago against content hash 878d5e88ca79, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

drawio-mcp CLAUDE.md 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 4d 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.

CLAUDE.md · 165 lines

How it starts

The opening of the file, as written. The whole thing — 165 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Draw.io MCP Server

The official draw.io MCP (Model Context Protocol) server that enables LLMs to open and create diagrams in the draw.io editor.

Repository Structure

  • .claude-plugin/marketplace.json — Claude Code plugin marketplace manifest. Lists this repo's plugins (currently just drawio, sourced from ./plugins/claude-code); plugin metadata is inherited from each plugin's own plugin.json. Users install with /plugin marketplace add jgraph/drawio-mcp then /plugin install drawio@drawio.
  • .agents/plugins/marketplace.json — Codex CLI plugin marketplace manifest (Codex's format: source object + policy + category). Lists the drawio plugin sourced from ./plugins/codex/drawio; metadata is inherited from that plugin's own .codex-plugin/plugin.json. Users install with codex plugin marketplace add jgraph/drawio-mcp then codex plugin add drawio@drawio.
  • .github/plugin/marketplace.json — GitHub Copilot CLI plugin marketplace manifest (same schema family as Claude's, but plugin metadata is inlined in the plugins[] entry rather than inherited — keep it in sync with plugins/copilot/plugin.json). Lists the drawio plugin sourced from ./plugins/copilot. Users install with copilot plugin marketplace add jgraph/drawio-mcp then copilot plugin install drawio@drawio. Copilot CLI checks this path first and falls back to .claude-plugin/marketplace.json.
  • shared/ — Shared XML generation reference (xml-reference.md), the single source of truth for all LLM prompts.
  • mcp-app-server/ — MCP App server (renders diagrams inline in chat via iframe). Hosted at https://mcp.draw.io/mcp. Can also be self-hosted via Node.js or Cloudflare Workers. Its server.json is the MCP Community Registry manifest (io.draw/mcp — feeds github.com/mcp and VS Code's MCP browser); publish runbook in its README.
  • mcp-tool-server/ — Original MCP tool server (stdio-based, opens browser). Published as @drawio/mcp on npm.
  • project-instructions/ — Claude Project instructions (no MCP required, no install).
  • plugins/ — Assistant-side plugins grouped by host, one subdirectory per AI assistant.
    • plugins/claude-code/ — Claude Code plugin: ships the drawio skill (generates native .drawio files, authored as Mermaid — converted + laid out by the desktop CLI — or as XML directly with optional ELK --layout; exports to PNG/SVG/PDF, or opens as a browser URL via app.diagrams.net). Mermaid conversion, ELK layout, and image export need draw.io Desktop; plain XML .drawio/url output does not. Installable via the repo-root marketplace or claude --plugin-dir ./plugins/claude-code. No MCP required.
    • plugins/codex/drawio/ — Codex CLI plugin: the Codex port of the Claude Code plugin, shipping the same drawio skill. skills/drawio/SKILL.md is byte-identical to the Claude plugin's copy (Codex uses the same /drawio:drawio invocation and fetches the same shared references from GitHub). Differs only in host wrapping: a .codex-plugin/plugin.json manifest with an interface block (official draw.io SVG logo, brandColor, default prompts). Nested under codex/ because Codex requires the plugin root folder name to equal plugin.json "name" (drawio). No MCP required.
    • plugins/copilot/ — GitHub Copilot CLI plugin: the Copilot port of the Claude Code plugin, shipping the same drawio skill. skills/drawio/SKILL.md is byte-identical to the Claude plugin's copy (the in-skill /drawio:drawio example lines are model-facing; Copilot's user-facing command is plain /drawio since Copilot doesn't prefix plugin skills). Differs only in host wrapping: a root plugin.json manifest (Copilot's format, skills directory list); no folder-name rule, so copilot/ is itself the plugin root. The same skill folder also works in other Copilot surfaces (VS Code agent mode, coding agent, code review) when copied to a repo's .github/skills/. No MCP required.
  • shape-search/ — Shape search index generator. Loads draw.io's app.min.js via jsdom to extract all shape styles and tags into search-index.json, which powers the search_shapes MCP tool. Re-run after updating drawio-dev to pick up new or changed shapes.

Read the full file on GitHub · 165 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. 4d ago First seen · 165 lines · 3,005 tokens per session scan A 878d5e88ca79

Subscribe to this mod's changes

drawio-mcp CLAUDE.md is an instructions file published in the GitHub repository jgraph/drawio-mcp (5,332 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 3,005 tokens to every session, about $0.0150 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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