JetBrains IDE WebSocket Monitor

by dortegau

1 stars

263 downloads

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GitHub

About

JetBrains MCP Server fork that broadcasts real-time WebSocket monitoring of all tool calls between clients and IDEs for debugging and extending integration functionality.

Details

Author: dortegau
Repository: dortegau/mcp-proxy-sidecar
GitHub stars: 1
Downloads: 263
License: Apache License 2.0
Categories: Developer Tools, AI, Infrastructure, Knowledge Base

Setting up with Highlight

This MCP is not yet compatible with Highlight’s one-click setup. However, you can still use it with Highlight by following these steps:

Download and install Highlight from highlightai.com/download
Navigate to the plugins tab and select "Add Custom Plugin"
Configure the plugin with the settings below
Plugin Name JetBrains IDE WebSocket Monitor

Command (node, npx, python, etc.) npx
Arguments
- Argument 1 -y
- Argument 2 mcp-proxy-sidecar
Environment
- HOST 127.0.0.1
- WS_PORT 27042
- IDE_PORT 63342
- LOG_ENABLED true
Please refer to the README for specific instructions on how to obtain API keys or other required environment variables.
Enable "Start Automatically" if you want the plugin to start when Highlight launches

Setting up with Cursor

Open Cursor's settings
Navigate to the MCP section
Click "Add new Global MCP server"
Copy and paste the configuration below based on your operating system

JSON

{
    "mcpServers": {
        "jetbrains ide websocket monitor": {
            "env": {
                "HOST": "127.0.0.1",
                "WS_PORT": "27042",
                "IDE_PORT": "63342",
                "LOG_ENABLED": "true"
            },
            "args": [
                "-y",
                "mcp-proxy-sidecar"
            ],
            "command": "npx"
        }
    }
}

JSON

{
    "mcpServers": {
        "jetbrains ide websocket monitor": {
            "env": {
                "HOST": "127.0.0.1",
                "WS_PORT": "27042",
                "IDE_PORT": "63342",
                "LOG_ENABLED": "true"
            },
            "args": [
                "/c",
                "npx",
                "-y",
                "mcp-proxy-sidecar"
            ],
            "command": "cmd"
        }
    }
}

JSON

{
    "mcpServers": {
        "jetbrains ide websocket monitor": {
            "env": {
                "HOST": "127.0.0.1",
                "WS_PORT": "27042",
                "IDE_PORT": "63342",
                "LOG_ENABLED": "true"
            },
            "args": [
                "-y",
                "mcp-proxy-sidecar"
            ],
            "command": "npx"
        }
    }
}

Setting up with Claude Desktop

Open Claude Desktop's settings
Go to the Integrations tab
Click "Add MCP Server"
Use the configuration below based on your operating system

Note: Make sure Claude Desktop is running before attempting to connect.

JSON

{
    "mcpServers": {
        "jetbrains ide websocket monitor": {
            "env": {
                "HOST": "127.0.0.1",
                "WS_PORT": "27042",
                "IDE_PORT": "63342",
                "LOG_ENABLED": "true"
            },
            "args": [
                "-y",
                "mcp-proxy-sidecar"
            ],
            "command": "npx"
        }
    }
}

JSON

{
    "mcpServers": {
        "jetbrains ide websocket monitor": {
            "env": {
                "HOST": "127.0.0.1",
                "WS_PORT": "27042",
                "IDE_PORT": "63342",
                "LOG_ENABLED": "true"
            },
            "args": [
                "/c",
                "npx",
                "-y",
                "mcp-proxy-sidecar"
            ],
            "command": "cmd"
        }
    }
}

JSON

{
    "mcpServers": {
        "jetbrains ide websocket monitor": {
            "env": {
                "HOST": "127.0.0.1",
                "WS_PORT": "27042",
                "IDE_PORT": "63342",
                "LOG_ENABLED": "true"
            },
            "args": [
                "-y",
                "mcp-proxy-sidecar"
            ],
            "command": "npx"
        }
    }
}

Setting up with Windsurf

Open Windsurf's preferences
Go to the Integrations section
Click "Add MCP Integration"
Use the configuration below based on your operating system

JSON

{
    "mcpServers": {
        "jetbrains ide websocket monitor": {
            "env": {
                "HOST": "127.0.0.1",
                "WS_PORT": "27042",
                "IDE_PORT": "63342",
                "LOG_ENABLED": "true"
            },
            "args": [
                "-y",
                "mcp-proxy-sidecar"
            ],
            "command": "npx"
        }
    }
}

JSON

{
    "mcpServers": {
        "jetbrains ide websocket monitor": {
            "env": {
                "HOST": "127.0.0.1",
                "WS_PORT": "27042",
                "IDE_PORT": "63342",
                "LOG_ENABLED": "true"
            },
            "args": [
                "/c",
                "npx",
                "-y",
                "mcp-proxy-sidecar"
            ],
            "command": "cmd"
        }
    }
}

JSON

{
    "mcpServers": {
        "jetbrains ide websocket monitor": {
            "env": {
                "HOST": "127.0.0.1",
                "WS_PORT": "27042",
                "IDE_PORT": "63342",
                "LOG_ENABLED": "true"
            },
            "args": [
                "-y",
                "mcp-proxy-sidecar"
            ],
            "command": "npx"
        }
    }
}

Setting up with Cline

Open Cline's settings
Navigate to the Integrations section
Click "Add MCP Server"
Copy and paste the configuration below based on your operating system

Note: Make sure to restart Cline after adding the configuration.

JSON

{
    "mcpServers": {
        "jetbrains ide websocket monitor": {
            "env": {
                "HOST": "127.0.0.1",
                "WS_PORT": "27042",
                "IDE_PORT": "63342",
                "LOG_ENABLED": "true"
            },
            "args": [
                "-y",
                "mcp-proxy-sidecar"
            ],
            "command": "npx"
        }
    }
}

JSON

{
    "mcpServers": {
        "jetbrains ide websocket monitor": {
            "env": {
                "HOST": "127.0.0.1",
                "WS_PORT": "27042",
                "IDE_PORT": "63342",
                "LOG_ENABLED": "true"
            },
            "args": [
                "/c",
                "npx",
                "-y",
                "mcp-proxy-sidecar"
            ],
            "command": "cmd"
        }
    }
}

JSON

{
    "mcpServers": {
        "jetbrains ide websocket monitor": {
            "env": {
                "HOST": "127.0.0.1",
                "WS_PORT": "27042",
                "IDE_PORT": "63342",
                "LOG_ENABLED": "true"
            },
            "args": [
                "-y",
                "mcp-proxy-sidecar"
            ],
            "command": "npx"
        }
    }
}

Setting up with Goose

Open Goose's preferences
Go to the Integrations tab
Select "MCP Servers"
Click "Add New Server"
Use the configuration below based on your operating system

JSON

{
    "mcpServers": {
        "jetbrains ide websocket monitor": {
            "env": {
                "HOST": "127.0.0.1",
                "WS_PORT": "27042",
                "IDE_PORT": "63342",
                "LOG_ENABLED": "true"
            },
            "args": [
                "-y",
                "mcp-proxy-sidecar"
            ],
            "command": "npx"
        }
    }
}

JSON

{
    "mcpServers": {
        "jetbrains ide websocket monitor": {
            "env": {
                "HOST": "127.0.0.1",
                "WS_PORT": "27042",
                "IDE_PORT": "63342",
                "LOG_ENABLED": "true"
            },
            "args": [
                "/c",
                "npx",
                "-y",
                "mcp-proxy-sidecar"
            ],
            "command": "cmd"
        }
    }
}

JSON

{
    "mcpServers": {
        "jetbrains ide websocket monitor": {
            "env": {
                "HOST": "127.0.0.1",
                "WS_PORT": "27042",
                "IDE_PORT": "63342",
                "LOG_ENABLED": "true"
            },
            "args": [
                "-y",
                "mcp-proxy-sidecar"
            ],
            "command": "npx"
        }
    }
}

From the repository

The WebSocket server runs on port 27042 by default. You can customize this port using the WS_PORT environment variable in your configuration:

"env": {
  "WS_PORT": "<custom port number>"  // Example: "8080"
}

Claude Desktop / Cursor

Paste into your MCP client config file to install this server.

{
    "mcpServers": {
        "jetbrains ide websocket monitor": {
            "env": {
                "HOST": "127.0.0.1",
                "WS_PORT": "27042",
                "IDE_PORT": "63342",
                "LOG_ENABLED": "true"
            },
            "args": [
                "-y",
                "mcp-proxy-sidecar"
            ],
            "command": "npx"
        }
    }
}

Linux

{
    "env": {
        "HOST": "127.0.0.1",
        "WS_PORT": "27042",
        "IDE_PORT": "63342",
        "LOG_ENABLED": "true"
    },
    "args": [
        "-y",
        "mcp-proxy-sidecar"
    ],
    "command": "npx"
}

Macos

{
    "env": {
        "HOST": "127.0.0.1",
        "WS_PORT": "27042",
        "IDE_PORT": "63342",
        "LOG_ENABLED": "true"
    },
    "args": [
        "-y",
        "mcp-proxy-sidecar"
    ],
    "command": "npx"
}

Windows

{
    "env": {
        "HOST": "127.0.0.1",
        "WS_PORT": "27042",
        "IDE_PORT": "63342",
        "LOG_ENABLED": "true"
    },
    "args": [
        "/c",
        "npx",
        "-y",
        "mcp-proxy-sidecar"
    ],
    "command": "cmd"
}

MCP Proxy Sidecar

A fork of the JetBrains MCP Server that adds WebSocket monitoring capabilities, created by @dortegau.

> This project extends the original MCP server functionality with WebSocket support while maintaining compatibility with all features of the original implementation.

Architecture

graph LR
    A[MCP Client<br>e.g. Claude<br>Desktop App]
    B[MCP Proxy<br>Sidecar<br>with WebSocket]
    C[JetBrains IDE]
    D[WebSocket Clients<br>Monitoring]
    
    A <--MCP requests/responses--> B
    B <--IDE commands/responses--> C
    B --WebSocket notifications<br>port 27042--> D
style A fill:#f5f5f5,stroke:#333,stroke-width:2px

    style B fill:#e1f5fe,stroke:#333,stroke-width:2px

    style C fill:#f5f5f5,stroke:#333,stroke-width:2px

    style D fill:#f5f5f5,stroke:#333,stroke-width:2px

The diagram above illustrates the system architecture and data flow:
1. MCP Clients (like Claude Desktop App) communicate with the Sidecar using MCP protocol
2. The Sidecar translates and forwards commands to JetBrains IDE
3. Responses from the IDE are sent back through the Sidecar
4. All tool calls are broadcasted via WebSocket for monitoring purposes

Features

WebSocket Message Format

interface MCPNotification {
  type: 'mcp-notification';
  payload: {
    endpoint: string;     // Tool name that was called
    content: any;         // Call arguments
    timestamp: string;    // ISO timestamp
  }
}

WebSocket Configuration

The WebSocket server runs on port 27042 by default. You can customize this port using the WS_PORT environment variable in your configuration:

"env": {
  "WS_PORT": "<custom port number>"  // Example: "8080"
}

Usage

Install MCP Server Plugin

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About

Details

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Setting up with Highlight

From the repository

Claude Desktop / Cursor

Linux

Macos

Windows

MCP Proxy Sidecar

Architecture

Features

WebSocket Message Format

WebSocket Configuration

Usage

Install MCP Server Plugin

Install

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