Lucid MCP Server

Model Context Protocol (MCP) server for Lucid App integration. Enables multimodal LLMs to access and analyze Lucid diagrams through visual exports.

Table of Contents

• Features
• Prerequisites
• Quick Start
• Usage
• VS Code Integration
• Contributing
• References
• License

Features

• 🔍 Document discovery and metadata retrieval from LucidChart, LucidSpark, and LucidScale
• 📑 Lightweight tab metadata for quick document structure overview
• 🖼️ PNG image export from Lucid diagrams
• 🤖 AI-powered diagram analysis with multimodal LLMs (supports Azure OpenAI and OpenAI)
• ⚙️ Environment-based API key management with automatic fallback from Azure to OpenAI.
• 📝 TypeScript implementation with full test coverage
• 🔧 MCP Inspector integration for easy testing

Prerequisites

Before you begin, ensure you have the following:

• Node.js: Version 18 or higher.
• Lucid API Key: A key from the Lucid Developer Portal is required for all features.
• AI Provider Key (Optional): For AI-powered diagram analysis, you need an API key for either:
  • Azure OpenAI
  • OpenAI

Quick Start

Follow these steps to get the server running.

Installing via Smithery

To install lucid-mcp-server for Claude Desktop automatically via Smithery:

npx -y @smithery/cli install @smartzan63/lucid-mcp-server --client claude

1. Install

Install the package globally from npm:

npm install -g lucid-mcp-server

2. Configure

Set the following environment variables in your terminal. Only the Lucid API key is required.

# Required for all features
export LUCID_API_KEY="your_api_key_here"

# Optional: For AI analysis, configure either Azure OpenAI or OpenAI

# Option 1: Azure OpenAI (takes precedence)
export AZURE_OPENAI_API_KEY="your_azure_openai_key"
export AZURE_OPENAI_ENDPOINT="https://your-resource.openai.azure.com"  
export AZURE_OPENAI_DEPLOYMENT_NAME="gpt-4o"

# Option 2: OpenAI (used as a fallback if Azure is not configured)
export OPENAI_API_KEY="your_openai_api_key"
export OPENAI_MODEL="gpt-4o" # Optional, defaults to gpt-4o

Note: The server automatically uses Azure OpenAI if AZURE_OPENAI_API_KEY is set. If not, it falls back to OpenAI if OPENAI_API_KEY is provided.

3. Verify

Test your installation using the MCP Inspector:

npx @modelcontextprotocol/inspector lucid-mcp-server

Usage

Once the server is running, you can interact with it using natural language or by calling its tools directly.

Example Prompts

• Basic commands (works with just a Lucid API key):

  • "Show me all my Lucid documents"
  • "Get information about the document with ID: [document-id]"

• AI Analysis (requires Azure OpenAI or OpenAI setup):

  • "Analyze this diagram: [document-id]"
  • "What does this Lucid diagram show: [document-id]"

Available Tools

🔍 search-documents

Lists documents in your Lucid account.

• Parameters:
  • keywords (string, optional): Search keywords to filter documents.
• Example:

  {
    "keywords": "architecture diagram"
  }
  

📋 get-document

Gets document metadata and can optionally perform AI analysis on its visual content.

• Parameters:
  • documentId (string): The ID of the document from the Lucid URL.
  • analyzeImage (boolean, optional): Set to true to perform AI analysis. ⚠️ Requires Azure or OpenAI key.
  • pageId (string, optional): The specific page to export (default: "0_0").
• Example:

  {
    "documentId": "demo-document-id-here-12345678/edit",
    "analyzeImage": true
  }
  

📑 get-document-tabs

Gets lightweight metadata about all tabs (pages) in a Lucid document without retrieving full content.

• Parameters:
  • documentId (string): The ID of the document from the Lucid URL.
• Returns: Document info with page metadata (id, title, index) for quick navigation and overview.
• Example:

  {
    "documentId": "demo-document-id-here-12345678/edit"
  }
  

VS Code Integration

You can integrate the server directly into Visual Studio Code.

Method 1: Through VS Code UI (Recommended)

1. Open the Command Palette (Ctrl+Shift+P or Cmd+Shift+P).
2. Run the command: "MCP: Add Server".
3. Choose "npm" as the source.
4. Enter the package name: lucid-mcp-server.
5. VS Code will guide you through the rest of the setup.
6. Verify automatically created configuration, because AI can make mistakes

Method 2: Quick Install Link

Click the "Install in VS Code" badge at the top of this README, then follow the on-screen prompts. You will need to configure the environment variables manually in your settings.json.

Method 3: Manual Configuration

{
  "mcp": {
    "servers": {
      "lucid-mcp-server": {
        "type": "stdio",
        "command": "lucid-mcp-server",
        "env": {
          "LUCID_API_KEY": "${input:lucid_api_key}",
          "AZURE_OPENAI_API_KEY": "${input:azure_openai_api_key}",
          "AZURE_OPENAI_ENDPOINT": "${input:azure_openai_endpoint}",
          "AZURE_OPENAI_DEPLOYMENT_NAME": "${input:azure_openai_deployment_name}",
          "OPENAI_API_KEY": "${input:openai_api_key}",
          "OPENAI_MODEL": "${input:openai_model}"
        }
      }
    },
    "inputs": [
      {
        "id": "lucid_api_key", 
        "type": "promptString",
        "description": "Lucid API Key (REQUIRED)"
      },
      {
        "id": "azure_openai_api_key",
        "type": "promptString", 
        "description": "Azure OpenAI API Key (Optional, for AI analysis)"
      },
      {
        "id": "azure_openai_endpoint",
        "type": "promptString",
        "description": "Azure OpenAI Endpoint (Optional, for AI analysis)"
      },
      {
        "id": "azure_openai_deployment_name",
        "type": "promptString",
        "description": "Azure OpenAI Deployment Name (Optional, for AI analysis)"
      },
      {
        "id": "openai_api_key",
        "type": "promptString", 
        "description": "OpenAI API Key (Optional, for AI analysis - used if Azure is not configured)"
      },
      {
        "id": "openai_model",
        "type": "promptString",
        "description": "OpenAI Model (Optional, for AI analysis, default: gpt-4o)"
      }
    ]
  }
}

Small Demo

🤝 Contributing

1. Fork the repository.
2. Create your feature branch (git checkout -b feature/amazing-feature).
3. Commit your changes (git commit -m 'Add amazing feature').
4. Push to the branch (git push origin feature/amazing-feature).
5. Open a Pull Request.

📚 References

• Model Context Protocol
• Lucid Developer API
• MCP Typescript SDK Documentation

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.