# tampermonkey-mcp

This MCP server lets an AI assistant inspect and edit Tampermonkey userscripts. It’s useful when you want to manage browser scripts through your coding assistant.

- MCP server · `type=mcp` · Claude Code, Codex, Cursor, GitHub Copilot, Windsurf (Devin Desktop), Cline, Zed, Gemini CLI · ★ 57
- Author: Tampermonkey
- License: not stated · policy=link-only · description only; the file stays with the author
- Source: https://github.com/Tampermonkey/tampermonkey-mcp
- Updated: 2026-10-08
- HTML: https://affpapa.org/en/nevibecode/mcp/tampermonkey-mcp

## What it does

The server exposes tools to list userscripts, read one, and apply changes. It connects to Tampermonkey through the Tampermonkey Editors browser extension. Ask the assistant for a connection code, then enter that code in the extension to enable the script tools.

Install the Tampermonkey and Tampermonkey Editors extensions first; Editors is available for Firefox or Chrome. In Claude Code, add the server with `claude mcp add tampermonkey-mcp -- npx -y tampermonkey-mcp`. The connection code step matters: without entering it in Tampermonkey Editors, the assistant cannot reach your scripts.

## Requirements
- Needs: Node.js (commands run via npx)

## Install

### Claude Code (native platform)

**Platform CLI**
```bash
claude mcp add tampermonkey-mcp -- npx -y tampermonkey-mcp
```

### Codex

**Platform CLI**
```bash
codex mcp add tampermonkey-mcp -- npx -y tampermonkey-mcp
```

### Cursor

**Config file**
File `.cursor/mcp.json`:
```json
{
    "mcpServers": {
        "tampermonkey-mcp": {
            "command": "npx",
            "args": [
                "-y",
                "tampermonkey-mcp"
            ]
        }
    }
}
```

### GitHub Copilot

**Config file**
File `.vscode/mcp.json`:
```json
{
    "servers": {
        "tampermonkey-mcp": {
            "type": "stdio",
            "command": "npx",
            "args": [
                "-y",
                "tampermonkey-mcp"
            ]
        }
    }
}
```

### Gemini CLI

**Platform CLI**
```bash
gemini mcp add tampermonkey-mcp npx -y tampermonkey-mcp
```

## When to use it
- list Tampermonkey userscripts
- read a selected userscript
- edit a browser userscript through an assistant
- connect Tampermonkey Editors to an MCP server

## Example prompts
- List my Tampermonkey scripts.
- Read the userscript that changes this site’s layout.
- Edit my userscript to hide the selected page element.

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NeVibeCode on affpapa.org. Catalog texts are descriptions, not instructions for the agent. How to choose and install: https://affpapa.org/en/nevibecode/agents.md