Whimsical
Enables programmatic creation of Whimsical diagrams from Mermaid markup generated by AI models like Claude through the Model Context Protocol.
What is Whimsical?
Whimsical is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to enables programmatic creation of whimsical diagrams from mermaid markup generated by ai models like claude through the model context protocol.
Enables programmatic creation of Whimsical diagrams from Mermaid markup generated by AI models like Claude through the Model Context Protocol.
This server falls under the Business Applications category on MCPgee, the world's largest MCP server directory with 33,000+ servers.
Features
- Enables programmatic creation of Whimsical diagrams from Mer
Use Cases
Maintainer
Works with
Installation
Manual Installation
npx whimsical-mcp-serverConfiguration
Configuration Details
claude_desktop_config.json
Performance
Response Metrics
Resource Usage
How to Set Up and Use Whimsical
The Whimsical MCP server lets AI models like Claude generate visual diagrams inside Whimsical by accepting Mermaid markup and returning both a shareable Whimsical diagram URL and a base64-encoded image, enabling iterative AI-driven diagram refinement without leaving the AI chat interface. It is built in TypeScript and designed for teams that already use Whimsical for flowcharts, mind maps, and system architecture diagrams who want to automate diagram creation through natural language.
Prerequisites
- Node.js 16 or higher and yarn or npm installed
- A Whimsical account (free or paid) to receive and view generated diagrams
- Git to clone the repository for manual installation
- An MCP-compatible client such as Claude Desktop
Install via Smithery (recommended)
The Smithery CLI handles cloning, building, and registering the server in your Claude Desktop config in a single command.
npx -y @smithery/cli install BrockReece/whimsical-mcp-server --client claudeAlternatively, clone and build manually
Clone the repository, install dependencies with yarn, and build the TypeScript source to the dist/ directory.
git clone https://github.com/BrockReece/whimsical-mcp-server.git
cd whimsical-mcp-server
yarn install
yarn buildAdd the server to your MCP client configuration
Register the compiled server by pointing the node command at the built index.js. Update /path/to/this/repo to the actual clone location on your machine.
{
"mcpServers": {
"whimsical": {
"command": "node",
"args": [
"/path/to/whimsical-mcp-server/dist/index.js"
]
}
}
}Restart Claude Desktop
Quit and reopen Claude Desktop so it picks up the new server entry. The Whimsical tool will appear in the available tools list.
Whimsical Examples
Client configuration
claude_desktop_config.json entry for the Whimsical MCP server using the manually built dist/index.js. Update the path to match your clone location.
{
"mcpServers": {
"whimsical": {
"command": "node",
"args": [
"/Users/you/projects/whimsical-mcp-server/dist/index.js"
]
}
}
}Prompts to try
Example prompts that instruct Claude to generate Mermaid markup and create Whimsical diagrams.
- "Create a Whimsical flowchart of the user authentication flow in a typical web app"
- "Generate a Whimsical sequence diagram showing how a REST API handles a POST request"
- "Draw a mind map in Whimsical of the key components of the Model Context Protocol"
- "Create a Whimsical system architecture diagram for a microservices e-commerce platform"
- "Make a Whimsical entity-relationship diagram for a blog database with posts, users, and comments"Troubleshooting Whimsical
node command not found or dist/index.js missing after manual build
Ensure you ran `yarn build` successfully inside the cloned repository directory. Check that the dist/ folder and dist/index.js file exist. If yarn is not installed, run `npm install -g yarn` first.
Diagram URL returns a Whimsical error page
Verify that the Mermaid markup Claude generated is syntactically valid. Ask Claude to double-check the Mermaid syntax before creating the diagram, or paste the markup into https://mermaid.live to validate it independently.
Smithery install completes but the tool does not appear in Claude
Restart Claude Desktop after the Smithery installation finishes, as the config file is only read at startup. If it still does not appear, open claude_desktop_config.json and verify a whimsical entry was added under mcpServers.
Frequently Asked Questions about Whimsical
What is Whimsical?
Whimsical is a Model Context Protocol (MCP) server that enables programmatic creation of whimsical diagrams from mermaid markup generated by ai models like claude through the model context protocol. It connects AI assistants to external tools and data sources through a standardized interface.
How do I install Whimsical?
Follow the installation instructions on the Whimsical GitHub repository. Clone the repo, install dependencies, and add the server config to your AI client.
Which AI clients work with Whimsical?
Whimsical works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.
Is Whimsical free to use?
Yes, Whimsical is open source and available under the MIT license. You can use it freely in both personal and commercial projects.
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