# extension.dev MCP server

> Build, run, test, and submit browser extensions to Chrome, Firefox, Edge, and Safari stores from an AI client.

- Repository: https://github.com/extensiondev/mcp
- Page: https://hostedmcp.org/servers/extensiondev/mcp
- Transport: stdio
- Stars: 0
- License: Apache-2.0
- Latest version: 10.22.0

## Install

### Claude Code

```sh
claude mcp add mcp -- npx -y @extension.dev/mcp
```

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

```json
{
  "mcpServers": {
    "mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@extension.dev/mcp"
      ]
    }
  }
}
```

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

```json
{
  "servers": {
    "mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@extension.dev/mcp"
      ]
    }
  }
}
```

### VS Code CLI

```sh
code --add-mcp '{"name":"mcp","type":"stdio","command":"npx","args":["-y","@extension.dev/mcp"]}'
```

### Claude Desktop (`claude_desktop_config.json`)

```json
{
  "mcpServers": {
    "mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@extension.dev/mcp"
      ]
    }
  }
}
```

### Codex

```sh
codex mcp add mcp -- npx -y @extension.dev/mcp
```

### Codex config.toml (`~/.codex/config.toml`)

```toml
[mcp_servers.mcp]
command = "npx"
args = ["-y", "@extension.dev/mcp"]
```

### Gemini CLI

```sh
gemini mcp add -s user mcp npx -- -y @extension.dev/mcp
```

### Gemini settings.json (`~/.gemini/settings.json`)

```json
{
  "mcpServers": {
    "mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@extension.dev/mcp"
      ]
    }
  }
}
```

## FAQ

### Can I submit extensions to multiple stores?

Yes, you can submit builds to the Chrome Web Store, Firefox Add-ons, Microsoft Edge Add-ons, and the Apple App Store.

### Do I need a Mac to publish to the Safari App Store?

No, the Safari lane does not require a Mac because the platform signs with keys held encrypted at rest on the platform.

### Does the server submit extensions automatically?

No, the server requires a human workspace owner to approve real submissions or promotions on extension.dev.

### How do I use the platform tools?

You must enable the platform features and log in once via a device code at extension.dev/device.