# Bernstein (MCP server)

> Bernstein is an MCP server that adds web browsing tools to AI assistants such as Claude Desktop, Claude Code and Cursor. The open-source governance layer for AI agents. It has 1,416 GitHub stars, is released under the Apache-2.0 license and runs locally with uvx bernstein.

"To achieve great things, two things are needed: a plan and not quite enough time." - attributed to Leonard Bernstein website · docs · install · first run · glossary · limitations · name policy · discord · sponsor

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/sipyourdrink-ltd/bernstein |
| GitHub stars | 1,416 |
| License | Apache-2.0 |
| Language | Python |
| Transport | stdio |
| Packages | pypi: bernstein; docker: ghcr.io/sipyourdrink-ltd/bernstein:3.21.0 |
| Remote URL | none |
| Needs API key | no |
| Official | no |
| Works with | Claude Desktop, Claude Code, Cursor, VS Code |
| Category | Web & browsing |
| Latest release | v3.21.0 (Oct 5, 2026) |
| Last commit | Oct 7, 2026 |
| MCP registry name | io.github.sipyourdrink-ltd/bernstein |

## Install

### Claude Desktop (claude_desktop_config.json)

```json
{
  "mcpServers": {
    "bernstein": {
      "command": "uvx",
      "args": [
        "bernstein"
      ]
    }
  }
}
```

Settings > Developer > Edit Config. macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\. Restart Claude Desktop afterwards.

### Claude Code

```sh
claude mcp add --transport stdio bernstein -- uvx bernstein
```

### Cursor (.cursor/mcp.json)

```json
{
  "mcpServers": {
    "bernstein": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "bernstein"
      ]
    }
  }
}
```

Project file; use ~/.cursor/mcp.json to enable it in every project.

### VS Code (.vscode/mcp.json)

```json
{
  "servers": {
    "bernstein": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "bernstein"
      ]
    }
  }
}
```

Config formats checked against the official docs on 2026-10-07.

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