MCP Architector

Model Context Protocol (MCP) server for architecture and system design

Local-first MCP server that stores and manages project architecture information. All data is stored locally in ~/.mcp-architector for maximum privacy and confidentiality.

📦 Install: npm install -g mcp-architector or use via npx
🌐 npm: https://www.npmjs.com/package/mcp-architector
🔗 GitHub: https://github.com/theSharque/mcp-architect

Overview

Store and manage project architecture, modules, scripts, data flow, and usage examples - all locally with complete privacy.

Features

• Local Storage: All data stored in ~/.mcp-architector (privacy-first)
• Project Architecture: Store and retrieve overall project architecture
• Module Details: Detailed information about each module
• Resources: Access architecture data via resources

Storage Structure

~/.mcp-architector/
└── {projectId}/
    ├── architecture.json      # Overall architecture
    ├── modules/
    │   ├── {moduleId}.json    # Module details
    │   └── ...
    └── scripts/
        ├── {scriptId}.json    # Script documentation
        └── ...

Quick Start

For Users (using npm package)

# No installation needed - use directly in Cursor/Claude Desktop
# Just configure it as described in Integration section below

For Developers

1. Clone the repository:

git clone https://github.com/theSharque/mcp-architect.git
cd mcp-architect

2. Install dependencies:

npm install

3. Build the project:

npm run build

Usage

Development Mode

Run with hot reload:

npm run dev

Production Mode

Start the server:

npm start

MCP Inspector

Debug and test your server with the MCP Inspector:

npm run inspector

Integration

Cursor IDE

1. Open Cursor Settings → Features → Model Context Protocol
2. Click "Edit Config" button
3. Add one of the configurations below

Option 1: Via npm (Recommended)

Installs from npm registry automatically:

{
  "mcpServers": {
    "architector": {
      "command": "npx",
      "args": ["-y", "mcp-architector"],
      "env": {
        "MCP_PROJECT_ID": "${workspaceFolder}"
      }
    }
  }
}

Option 2: Via npm link (Development)

For local development with live changes:

{
  "mcpServers": {
    "architector": {
      "command": "mcp-architector",
      "env": {
        "MCP_PROJECT_ID": "${workspaceFolder}"
      }
    }
  }
}

Requires: cd /path/to/mcp-architector && npm link -g

Option 3: Direct path

{
  "mcpServers": {
    "architector": {
      "command": "node",
      "args": ["/path/to/mcp-architector/dist/index.js"],
      "env": {
        "MCP_PROJECT_ID": "${workspaceFolder}"
      }
    }
  }
}

Claude Desktop

Edit ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

{
  "mcpServers": {
    "architector": {
      "command": "npx",
      "args": ["-y", "mcp-architector"],
      "env": {
        "MCP_PROJECT_ID": "${workspaceFolder}"
      }
    }
  }
}

Continue.dev

Edit .continue/config.json:

{
  "mcpServers": {
    "architector": {
      "command": "npx",
      "args": ["-y", "mcp-architector"],
      "env": {
        "MCP_PROJECT_ID": "${workspaceFolder}"
      }
    }
  }
}

Using Project ID

When calling tools, you can:

1. Use automatic project ID (from ${workspaceFolder} env var): Just omit the projectId parameter
2. Override per call: Pass projectId explicitly in the tool call
3. Use default: If neither is provided, uses "default-project"

Tools

set-project-architecture

Creates or updates the overall architecture for a project.

Input:

• projectId (optional): Project ID (defaults to "default-project")
• description: Overall project description
• modules: Array of module objects with:
  • name: Module name
  • description: Brief description of the module
  • inputs (optional): What this module requires to work
  • outputs (optional): What this module produces or generates
• dataFlow (optional): Object describing data flow between modules:
  • Key: module name
  • Value: object with:
    • dependsOn (optional): Array of module names this module depends on
    • providesTo (optional): Array of module names that receive data from this module
    • dataTransformation (optional): How data is transformed between modules

Output:

• Project ID and success message

get-project-architecture

Retrieves the overall architecture of the project.

Input:

• projectId (optional): Project ID (defaults to "default-project")

Output:

• Complete project architecture

set-module-details

Creates or updates detailed information about a module.

Input:

• projectId (optional): Project ID
• name: Module name
• description: Detailed description of the module
• inputs: What the module accepts as input
• outputs: What the module produces as output
• dependencies (optional): List of module dependencies
• files (optional): List of files belonging to this module
• usageExamples (optional): Array of usage examples with fields:
  • title: Example title
  • description (optional): Description of the example
  • command (optional): Command or code snippet
  • input (optional): Input data
  • output (optional): Expected output
  • notes (optional): Additional notes about the example
• notes (optional): Additional notes

Output:

• Module ID and success message

get-module-details

Retrieves detailed information about a specific module.

Input:

• projectId (optional): Project ID
• moduleName: Name of the module to retrieve

Output:

• Complete module details

list-modules

Lists all modules in the project architecture.

Input:

• projectId (optional): Project ID

Output:

• Array of module summaries

delete-module

Deletes a module from the project architecture.

Input:

• projectId (optional): Project ID
• moduleName: Name of the module to delete

Output:

• Success message

set-script-documentation

Creates or updates documentation for a script or command.

Input:

• projectId (optional): Project ID
• scriptName: Name of the script
• description: Description of what the script does
• usage: Usage command or syntax
• examples: Array of usage examples
• parameters: Object mapping parameter names to descriptions
• notes (optional): Additional notes

Output:

• Script ID and success message

get-script-documentation

Retrieves documentation for a specific script.

Input:

• projectId (optional): Project ID
• scriptName: Name of the script to retrieve

Output:

• Script documentation

list-scripts

Lists all documented scripts in the project.

Input:

• projectId (optional): Project ID

Output:

• Array of script documentations

Resources

architecture

Provides access to project architecture as a resource.

Usage: Access via URI: arch://{projectId}

module

Provides access to module details as a resource.

Usage: Access via URI: module://{projectId}/{moduleId}

Development

Project Structure

mcp-architector/
├── src/
│   ├── index.ts          # Main server implementation
│   ├── types.ts          # Type definitions
│   └── storage.ts        # Storage utilities
├── dist/                 # Compiled output (generated)
├── package.json
├── tsconfig.json
└── README.md

Project ID and Workdir

The server uses projectId to organize data in separate directories. The priority for determining project ID is:

1. Explicitly passed in tool call parameters (highest priority)
2. From environment variable MCP_PROJECT_ID (set during initialization)
3. Default fallback "default-project" (lowest priority)

For Cursor integration, set MCP_PROJECT_ID to use the workspace directory automatically as the project ID.

Extending the Server

To add new tools, resources, or prompts, edit src/index.ts:

// Add a tool
server.registerTool(
  "tool-name",
  { /* tool config */ },
  async (params) => { /* handler */ }
);

// Add a resource
server.registerResource(
  "resource-name",
  new ResourceTemplate("uri-template", { /* options */ }),
  { /* resource config */ },
  async (uri, params) => { /* handler */ }
);

// Add a prompt
server.registerPrompt(
  "prompt-name",
  { /* prompt config */ },
  (args) => { /* handler */ }
);

License

MIT