How to connect Excalidraw MCP to Claude Cowork

Connect Claude Cowork to Excalidraw MCP. Create hand-drawn system architecture diagram, draw user onboarding flowchart with notes, and more using natural language, with authentication handled for you.

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No Auth

Excalidraw MCP is a no-auth MCP server for creating hand-drawn style diagrams in Excalidraw. Use it to generate visual sketches with viewport camera control and fullscreen editing.

5 Tools

Introduction

Cowork is Anthropic's AI agent for knowledge work. Think of it as Claude Code for everything else. It works autonomously with your computer, local files, and applications to accomplish complex tasks.

This guide walks you through the easiest and most secure way to connect your Excalidraw account to Cowork via Composio Connect, enabling it to create hand-drawn system architecture diagram, draw user onboarding flowchart with notes, open fullscreen editor for wireframe review, and more such actions on your behalf without compromising your account security.

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Connecting Excalidraw to Claude Cowork

1. Open Customize

In Claude Desktop, click Customize in the left sidebar, then select Connectors and click the + icon at the top.

Claude Desktop connectors screen with Add custom connector selected

2. Add the Composio MCP server

Click Add custom connector and paste in the Composio MCP server URL:

bash
https://connect.composio.dev/mcp
Add custom connector dialog with Composio MCP server URL

3. Authorize in your browser

Click Connect. You'll be redirected to a browser window where you can authorize Composio to continue.

Composio authorization screen for Claude Cowork

4. Connect your Excalidraw account

Back in Cowork, ask the agent to connect to Excalidraw or give it any Excalidraw-related task.

For example, ask Cowork to:

  • "Create hand-drawn system architecture diagram"
  • "Draw user onboarding flowchart with notes"
  • "Open fullscreen editor for wireframe review"

It will prompt you to authenticate and authorize access.

That's it. Composio's tools are now available in Cowork, and your Excalidraw account is ready to use.

What is Claude Cowork?

Claude Cowork is Anthropic's agent for general knowledge work. It can use your computer, files, and connected applications to complete longer-running tasks across your work tools.

With Composio Connect, Cowork can securely access apps like Excalidraw through MCP without you sharing account credentials directly with the agent.

What is the Excalidraw MCP server, and what's possible with it?

The Excalidraw MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Excalidraw account. It provides structured and secure access so your agent can perform Excalidraw operations on your behalf.

TOOLS

Supported Tools

Every Excalidraw MCP action and event your agent gets out of the box.

Create view

Renders a hand-drawn diagram using Excalidraw elements.

Export to excalidraw

Upload diagram to excalidraw.

Read checkpoint

Read checkpoint state for restore.

Read me

Returns the Excalidraw element format reference with color palettes, examples, and tips.

Save checkpoint

Update checkpoint with user-edited state.

FRAMEWORKS

How to build Excalidraw MCP Agent with another framework

FAQ

Frequently asked questions

With a standalone Excalidraw MCP server, the agents and LLMs can only access a fixed set of Excalidraw tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Excalidraw and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Claude Cowork fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Excalidraw tools.

Yes, absolutely. You can configure which Excalidraw scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Excalidraw data and credentials are handled as safely as possible.

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