MCP Session Bridge

Name: MCP Session Bridge
Author: t3ratech

by t3ratechversion 1.2.0i★ –iRuns on your computer

Registry nameio.github.t3ratech/mcp-session-bridge

Install

Overview

Description from the maker (original English)

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

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Web & browsers

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: T3RNEL_SESSION_MODE, T3RNEL_SESSION_HEADLESS, T3RNEL_SESSION_TIMEOUT_MS

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "session-bridge": {
      "command": "npx",
      "args": [
        "-y",
        "@t3ratech/mcp-session-bridge"
      ],
      "env": {
        "T3RNEL_SESSION_MODE": "your-value",
        "T3RNEL_SESSION_HEADLESS": "your-value",
        "T3RNEL_SESSION_TIMEOUT_MS": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add session-bridge --env T3RNEL_SESSION_MODE=your-value --env T3RNEL_SESSION_HEADLESS=your-value --env T3RNEL_SESSION_TIMEOUT_MS=your-value -- npx -y @t3ratech/mcp-session-bridge

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "session-bridge": {
      "command": "npx",
      "args": [
        "-y",
        "@t3ratech/mcp-session-bridge"
      ],
      "env": {
        "T3RNEL_SESSION_MODE": "your-value",
        "T3RNEL_SESSION_HEADLESS": "your-value",
        "T3RNEL_SESSION_TIMEOUT_MS": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "session-bridge": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@t3ratech/mcp-session-bridge"
      ],
      "env": {
        "T3RNEL_SESSION_MODE": "your-value",
        "T3RNEL_SESSION_HEADLESS": "your-value",
        "T3RNEL_SESSION_TIMEOUT_MS": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

T3RNEL_SESSION_MODE env
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 env
Set to 1 to run the standalone browser headless. Ignored in extension mode.
T3RNEL_SESSION_TIMEOUT_MS env
How long a single tool call may take before it fails rather than hanging the client.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account t3ratech, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Web & browsersi

More stars than 0% of the other 881 servers in this category
Published to the registry more recently than 35% of the other 881 servers in this category
Basic checks equal to or better than 100% of the other 881 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is MCP Session Bridge safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.2.0) reached the registry 2 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Browser Use, Chrome DevTools MCP, MCP Server Browser

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Browser Use

by browser-use

Lets AI do web tasks for you, such as filling forms, searching and extracting data, in the maker’s cloud browsers or on your computer.

Computer or cloud★ 120,087MITUpdated 17 days ago

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Chrome DevTools MCP

by ChromeDevTools

Lets AI use Chrome’s developer tools to inspect pages, find what makes them slow and spot errors. Made by the Chrome DevTools team.

Runs on your computer★ 54,821Apache-2.0Updated 16 days ago

Install

MCP Server Browser

by bytedance

MCP server for browser use access

Runs on your computer★ 39,550Apache-2.0Updated 14 months ago

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

MCP Session Bridge

A free MCP (Model Context Protocol) server that exposes authenticated browser-session automation: session_* tools that run in the user's own Chrome profile and real logged-in session, which cloud browser APIs cannot do. A free standalone mode is also available; it launches a dedicated automation browser so the same session_* tools work without the extension or a license.

What it does

Serves MCP over stdio (newline-delimited JSON-RPC) to any client that speaks the Model Context Protocol. The setup guide covers the common ones.
Uses a dual-transport design:
Extension mode (free; Pro tools gated by the extension) — forwards calls over a local, owner-only relay socket to a native messaging host that Chrome spawns, and from there to the T3rnel Browser extension, which executes them against the live authenticated tabs.
Standalone mode (free) — launches its own headful or headless CDP browser on a persistent profile and drives it directly. No license, no extension, and no access to the user's everyday browser.
Returns structured page context, form values, snapshots, and screenshots without shipping session cookies to a remote browser.

Price

The bridge itself is free, and this package enforces no licence of its own.

Extension mode reaches the buyer's real authenticated session through the T3rnel Browser extension, and the Pro tools it exposes are gated by that extension's own Pro tier — $29.99 once, three devices. Standalone mode is free and needs neither the extension nor a licence. There is no separate subscription for this package, and nothing here checks for one; earlier drafts of this file advertised $9/mo and $39/mo tiers that were never implemented, never enforced and never purchasable.

Project layout

src/server.js — MCP stdio server: tool surface, schema validation, dual-transport routing, relay client with reconnect and timeouts, and standalone CDP launcher.
src/cdp.js — standalone CDP browser management and WebSocket client.
src/native-host.js — native messaging host spawned by Chrome; owns the relay socket and multiplexes concurrent MCP servers.
src/framing.js — the 4-byte length-prefixed JSON framing shared by native messaging and the relay socket.
src/tools.js — the session_* tool definitions, validation, and mapping to the extension's browser_* tools.
src/license.js — offline Ed25519 license verification helpers used by the extension and tests.
src/install.js — --install / --uninstall native host registration for Chrome, Chromium, Brave and Edge.
docs/setup-guide.md — installing on the common MCP clients, plus verification and troubleshooting.
docs/chrome-validation-checklist.md — end-to-end validation steps for Chrome with the T3rnel Browser extension.
ads/ — ad-copy.md, the shared headline and description copy used when submitting to MCPize, Smithery, mcp.so and PulseMCP.
tests/ — node --test suite, including end-to-end tests through a real relay socket and native-messaging framing, plus standalone-mode coverage.

Browser support

Extension mode needs the T3rnel Browser extension, which is packaged for Chrome, Brave, Edge, Opera, Chromium and Firefox and ships from each browser's own extension store. Brave and Chromium install from the Chrome Web Store; Edge, Opera and Firefox each have a separate package. Opera implements no side-panel API and Firefox no debugger API, so both are partly supported; the extension's manifest generator states which capabilities are absent on each. Standalone mode has no browser requirement at all — it launches its own CDP browser.

The extension exposes up to 100 browser tools, plus the bridge's own session_install setup tool. If the merged list would exceed 100 tools — which Google Antigravity refuses to install — the bridge drops the two lowest-value verbs (session_md_diff, session_check_spelling) so the published list stays at or under the ceiling for every extension build. Dropped tools still execute when called by name; all tools remain subject to the extension's Pro gating and approval gate.

Supported clients

Claude Code / Claude Cowork
Cursor
VS Code
Windsurf / Devin Desktop
Google Antigravity
IntelliJ
Codex
Grok Build
Kimi Code / Kimi Desktop
JCode
Cline
OpenCode
Continue.dev
KiloCode
Roo Code
Aider
OpenClaw
Hermes
OpenFang
Any client that speaks MCP stdio

Install the T3rnel Browser extension

The bridge works best with the T3rnel Browser extension, which lets your AI drive the browser you are already signed into:

https://browser.t3ratech.co.zw/

Where this is listed

npm · Official MCP registry · Smithery · Glama
Agent skills: skills.sh · ClawHub
Listed in the Claude Market skill directory

Licence

Licensed under the Apache License, Version 2.0. See LICENSE for the full text.

The published npm package is free to use for any purpose, commercial or otherwise. You may read and modify this source; redistribution is governed by the Apache-2.0 terms.

MCP Session Bridge

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Web & browsersi

Common questions

Alternatives

Browser Use

Chrome DevTools MCP

MCP Server Browser

README from the maker

MCP Session Bridge

What it does

Price

Project layout

Browser support

Supported clients

Install the T3rnel Browser extension

Where this is listed

Licence