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Tampermonkey

I

by io.github.Tampermonkey

MCP server to manage your Tampermonkey scripts

Power your agent

Add this server

The publisher's own command. Not a PlugMCP endpoint.

Local command

npx -y [email protected]

Provider

Claude Code

claude mcp add io.github.tampermonkey-tampermonkey-mcp -- npx -y [email protected]

Run in a terminal.

Claude Desktop

{
  "mcpServers": {
    "io.github.tampermonkey-tampermonkey-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ]
    }
  }
}

claude_desktop_config.json

Step-by-step: add this in Claude

Remote URL or a command on your machine? How the two installs differ

Run on PlugMCP

Host a copy with our keys and logs.

A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.

Related MCP

Related skills

Questions

How do I install Tampermonkey?: Copy the stdio config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.
Does Tampermonkey need an API key?: No required environment variable is listed on this record.
What transport does Tampermonkey use?: Tampermonkey runs locally over stdio.
When was Tampermonkey last checked?: Last checked 2026-10-16. MCP server to manage your Tampermonkey scripts

How to use

First install the following browser extensions:

Tampermonkey
Tampermonkey Editors for Firefox or Chrome

Then install tampermonkey-mcp globally:

npm install -g tampermonkey-mcp@latest

Finally configure your AI assistant to use the tampermonkey tool:

{
  "mcpServers": {
    "tampermonkey": {
      "command": "npx",
      "args": [
        "-y",
        "tampermonkey-mcp@latest"
      ]
    }
  }
}

Your assistant will call tampermonkey_get_connection_code and return a connection code that you can enter in the Tampermonkey Editors extension.

Claude Code configuration example

npm install -g @anthropic-ai/claude-code

// either use your local checkout
npm run watch
claude mcp add --transport http --scope project tampermonkey http://localhost:4001/mcp

// or the npm package
npm install -g tampermonkey-mcp@latest
claude mcp add --transport stdio --scope project tampermonkey -- npx -y tampermonkey-mcp

// more browser control needed?
// Open chrome://inspect/#remote-debugging
// [x] Allow remote debugging for this browser instance
// or
chromium --user-data-dir=/tmp/chrome-devtools-mcp-test-profile --remote-debugging-port=9222

npm install -g chrome-devtools-mcp@latest
// install Tampermonkey and Tampermonkey Editors
claude mcp add --transport stdio --scope project chrome-devtools-mcp -- npx -y chrome-devtools-mcp@latest --slim --no-usage-statistics --auto-connect --browser-url http://127.0.0.1:9222

Build

npm install
npm run all

Tampermonkey MCP Server Architecture

Overview

This project implements an MCP (Model Context Protocol) server that allows AI assistants to read and modify Tampermonkey userscripts via the Tampermonkey Editors browser extension.

Architecture Components

┌─────────────────────────────────────────────────────────────────────────────┐
│                              AI Assistant                                   │
└─────────────────────────────────────────────────────────────────────────────┘
                                   │
                                   │ MCP Protocol (stdio transport)
                                   ▼
┌─────────────────────────────────────────────────────────────────────────────┐
│                         tampermonkey_mcp (MCP Server)                       │
│                                                                             │
│  ┌───────────────────────────────────────────────────────────────────────┐  │
│  │  server.ts                    │  Main entry point                     │  │
│  │                               │  - HTTP or stdio transport            │  │
│  │                               │  - MCP middleware                     │  │
│  └───────────────────────────────────────────────────────────────────────┘  │
│                                  │                                          │
│                                  ▼                                          │
│  ┌───────────────────────────────────────────────────────────────────────┐  │
│  │  tampermonkey.ts              │  MCP Tool Definitions                 │  │
│  │                               │  - tampermonkey_get_connection_code   │  │
│  │                               │  - tampermonkey_list                  │  │
│  │                               │  - tampermonkey_get                   │  │
│  │                               │  - tampermonkey_patch                 │  │
│  └───────────────────────────────────────────────────────────────────────┘  │
│                                  │                                          │
│                                  ▼                                          │
│  ┌───────────────────────────────────────────────────────────────────────┐  │
│  │  tampermonkey-ws-client.ts    │  WebSocket Server                     │  │
│  │                               │  - Connection code generation         │  │
│  │                               │  - Authentication handshake           │  │
│  │                               │  - Message relay to extension         │  │
│  └───────────────────────────────────────────────────────────────────────┘  │
└─────────────────────────────────────────────────────────────────────────────┘
                                   │
                                   │ WebSocket (local, port derived from code)
                                   ▼
┌─────────────────────────────────────────────────────────────────────────────┐
│                   Tampermonkey Editors Extension                            │
│                                                                             │
│  ┌───────────────────────────────────────────────────────────────────────┐  │
│  │  Service Worker               │  Receives connection code,            │  │
│  │                               │  establishes WebSocket connection     │  │
│  └───────────────────────────────────────────────────────────────────────┘  │
│                                  │                                          │
│                                  │ Chrome Extension Messaging               │
│                                  ▼                                          │
│  ┌───────────────────────────────────────────────────────────────────────┐  │
│  │  Content Script               │  Bridges extension ↔ Tampermonkey     │  │
│  └───────────────────────────────────────────────────────────────────────┘  │
│                                  │                                          │
│                                  ▼                                          │
│  ┌───────────────────────────────────────────────────────────────────────┐  │
│  │  Tampermonkey                 │  Userscript storage & execution       │  │
│  └───────────────────────────────────────────────────────────────────────┘  │
└─────────────────────────────────────────────────────────────────────────────┘

Connection Flow

MCP Server starts - Creates WebSocket server on a random available port
Connection code generated - Format: <base32(port - 1024)><auth_token><echo_token>
User calls tampermonkey_get_connection_code - Gets the connection code
User enters code in Tampermonkey Editors - Extension parses code to get port and auth
Extension connects to MCP server - WebSocket handshake with authentication
MCP tools become available - list, get, patch can now be called

Authentication Protocol

Extension                              MCP Server
    │                                      │
    │───── auth (token) ──────────────────>│
    │                                      │
    │<──── auth (echo_token) ──────────────│
    │                                      │
    │───── auth (echo_token) ─────────────>│
    │                                      │
    │<──── authOK ─────────────────────────│
    │                                      │
    │<───── pings (every 15s) ─────────────│  (keep-alive)
    │───── pongs ─────────────────────────>│
    │                                      │
    │<───── commands (list/get/patch) ─────│
    │───── responses ─────────────────────>│

MCP Tools

`tampermonkey_get_connection_code`

Purpose: Initialize connection by getting the WebSocket connection code.
Required: Must be called first to start the WebSocket server.
Output: Connection code to enter in Tampermonkey Editors.

`tampermonkey_list`

Purpose: List all available userscripts.
Input: Optional filter by name pattern or include URL pattern.
Output: Array of userscript metadata (name, namespace, path, requires).

`tampermonkey_get`

Purpose: Get content of a specific userscript.
Input: path (from list), optional ifNotModifiedSince timestamp.
Output: Script content, lastModified timestamp, or error.

`tampermonkey_patch`

Purpose: Update userscript content.
Input: path, value (new content), optional lastModified for optimistic locking.
Output: Success confirmation or error.

`tampermonkey_put`

Purpose: Create a new userscript with the given name and namespace.
Input: value (new script), optional lastModified.
Output: Success confirmation, path of created script, or error.
Requires: Tampermonkey Editors 1.0.6+ and Tampermonkey 5.6+

`tampermonkey_delete`

Purpose: Delete an existing userscript.
Input: path (from list).
Output: Success confirmation or error.
Requires: Tampermonkey Editors 1.0.6+ and Tampermonkey 5.6+

Basic testing

MCP Server capabilities

curl -X POST http://localhost:4001/mcp \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "initialize",
    "params": {
      "protocolVersion": "2024-11-05",
      "clientInfo": {
        "name": "curl-client",
        "version": "1.0.0"
      },
      "capabilities": {}
    }
  }'

test stdio

echo '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2024-11-05","clientInfo":{"name":"test-client","version":"1.0.0"},"capabilities":{}}}' | npx -y tampermonkey-mcp
echo '{"jsonrpc":"2.0","id":2,"method":"tools/list","params":{}}' | npx -y tampermonkey-mcp
echo '{"jsonrpc":"2.0","id":3,"method":"tools/call","params":{"name":"tampermonkey_list","arguments":{"pattern":""}}}' | npx -y tampermonkey-mcp