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Browser automation

Mcp Session Bridge

io.github.t3ratech/mcp-session-bridge · v1.4.1

Drive a browser you are already signed into, through the free T3rnel Browser extension.

Website Source code Set it up

Connect Runs on your machine

Terminal
claude mcp add mcp-session-bridge -e T3RNEL_SESSION_MODE=<T3RNEL_SESSION_MODE> -e T3RNEL_SESSION_HEADLESS=<T3RNEL_SESSION_HEADLESS> -e T3RNEL_SESSION_TIMEOUT_MS=<T3RNEL_SESSION_TIMEOUT_MS> -- npx -y @t3ratech/[email protected]
claude_desktop_config.json
{
  "mcpServers": {
    "mcp-session-bridge": {
      "command": "npx",
      "args": [
        "-y",
        "@t3ratech/[email protected]"
      ],
      "env": {
        "T3RNEL_SESSION_MODE": "<T3RNEL_SESSION_MODE>",
        "T3RNEL_SESSION_HEADLESS": "<T3RNEL_SESSION_HEADLESS>",
        "T3RNEL_SESSION_TIMEOUT_MS": "<T3RNEL_SESSION_TIMEOUT_MS>"
      }
    }
  }
}
~/.cursor/mcp.json
{
  "mcpServers": {
    "mcp-session-bridge": {
      "command": "npx",
      "args": [
        "-y",
        "@t3ratech/[email protected]"
      ],
      "env": {
        "T3RNEL_SESSION_MODE": "<T3RNEL_SESSION_MODE>",
        "T3RNEL_SESSION_HEADLESS": "<T3RNEL_SESSION_HEADLESS>",
        "T3RNEL_SESSION_TIMEOUT_MS": "<T3RNEL_SESSION_TIMEOUT_MS>"
      }
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "mcp-session-bridge": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@t3ratech/[email protected]"
      ],
      "env": {
        "T3RNEL_SESSION_MODE": "<T3RNEL_SESSION_MODE>",
        "T3RNEL_SESSION_HEADLESS": "<T3RNEL_SESSION_HEADLESS>",
        "T3RNEL_SESSION_TIMEOUT_MS": "<T3RNEL_SESSION_TIMEOUT_MS>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

NameDescription
T3RNEL_SESSION_MODE
Optional		auto (default) uses the extension when its relay socket exists and falls back to a standalone browser; extension forces the extension; standalone forces its own browser.
T3RNEL_SESSION_HEADLESS
Optional		Set to 1 to run the standalone browser headless. Ignored in extension mode.
T3RNEL_SESSION_TIMEOUT_MS
Optional		How long a single tool call may take before it fails rather than hanging the client.

Details

Package@t3ratech/[email protected] (NPM, stdio)
First published7 Nov 2026
Last updated7 Nov 2026
Registry nameio.github.t3ratech/mcp-session-bridge

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