chatgpt-review-mcp

A Model Context Protocol (MCP) server that lets Claude Code (or any MCP-compatible client) send prompts to your logged-in ChatGPT web session via Chrome DevTools Protocol. Use it to get a second opinion from GPT without consuming Anthropic tokens or OpenAI API quota — the request goes through your normal browser session using whichever model you have selected in the ChatGPT UI.

Runs on WSL2 (Ubuntu) + Windows Chrome. Adapting it to other setups is straightforward but not covered here.

Architecture

Claude Code (WSL)
   └─► MCP stdio ──► mcp_server.py (WSL)
                        └─► playwright.connect_over_cdp ──► 172.26.80.1:9222
                                                                  │
                                                         (netsh portproxy)
                                                                  ▼
                                                          Chrome CDP on ::1:9222
                                                                  │
                                                          chatgpt.com tab (logged in)

The MCP process runs in WSL. It reuses the Windows Chrome instance you have logged into ChatGPT — no headless browser, no API keys, no scraping-detection fights.

Prerequisites

• Windows 10/11 with WSL2 Ubuntu
• Chrome installed at C:\Program Files\Google\Chrome\Application\chrome.exe
• A paid or free ChatGPT account with a session that stays logged in
• Python 3.10+ inside WSL

Setup

1. Windows-side: launch a dedicated CDP Chrome

Use a separate profile so the CDP Chrome does not conflict with your daily Chrome. From WSL:

bash start-chrome.sh

This runs powershell.exe Start-Process chrome.exe --remote-debugging-port=9222 --user-data-dir=C:\chrome-cdp-profile https://chatgpt.com and opens a fresh Chrome window. Log in to ChatGPT once — the profile will remember it.

2. Windows-side: port forwarding for WSL access

Chrome 149+ only binds ::1:9222 (IPv6 loopback), so WSL cannot reach it directly through the 172.26.80.1 gateway. Fix with one command in administrator PowerShell:

netsh interface portproxy add v4tov6 listenaddress=0.0.0.0 listenport=9222 connectaddress=::1 connectport=9222

Optionally allow the port through Windows Firewall:

New-NetFirewallRule -DisplayName "Chrome CDP 9222 (WSL)" -Direction Inbound -Protocol TCP -LocalPort 9222 -Action Allow -Profile Any

To remove later: netsh interface portproxy delete v4tov4 listenaddress=0.0.0.0 listenport=9222

3. WSL-side: Python dependencies

cd chatgpt-review-mcp
python -m venv .venv
source .venv/bin/activate
pip install -r requirements.txt

playwright is used only for CDP connection — you do not need to run playwright install, no local browsers are downloaded.

4. Verify connectivity

python test_connect.py

Expected output includes Chrome: Chrome/..., the list of open tabs, and [✓] 找到 ChatGPT 页面. If it times out, the portproxy in step 2 is usually the culprit.

5. Register with Claude Code

claude mcp add --scope user chatgpt-review -- \
  /absolute/path/to/chatgpt-review-mcp/.venv/bin/python \
  /absolute/path/to/chatgpt-review-mcp/mcp_server.py

Restart Claude Code, then claude mcp list should show chatgpt-review: ... - ✓ Connected.

Usage

Once registered, ask Claude Code something like:

• "让 ChatGPT 审一下这个方案：..."
• "Get a second opinion from GPT on this design"
• "用 review_with_chatgpt 帮我看看这段代码"

The review_with_chatgpt tool takes:

Arg	Type	Default	Meaning
prompt	str	—	Message to send to ChatGPT (include enough context — GPT does not see your Claude Code conversation)
wait_timeout	int	180	Max seconds to wait for the reply to finish streaming
new_chat	bool	False	If True, open a fresh conversation so there is no prior turn history

Making new_chat=True truly context-free

ChatGPT has two other memory sources besides the current conversation:

1. Memory (explicitly saved facts about you)
2. Reference chat history (implicit recall of your other conversations)

Both default on. For a strict "independent reviewer with no context" setup, disable both in ChatGPT: profile picture → Settings → Personalization → toggle off Memory and Reference chat history.

Command-line use

chatgpt_client.py also works standalone:

python chatgpt_client.py "explain LogSumExp in one sentence"

Troubleshooting

• HTTP 探针失败: timed out — Windows Firewall or the portproxy rule is not in place. Confirm with powershell.exe -Command "netsh interface portproxy show all".
• Get-NetTCPConnection ... 9222 shows 127.0.0.1:9222 — you are on an old Chrome that still binds IPv4; use a v4tov4 rule instead of v4tov6.
• MCP returns "Retry" — happens if a previous ChatGPT generation was interrupted and the page still shows a Retry button. The client now polls for text stability and filters this out; if you still hit it, refresh the ChatGPT tab manually.
• Selectors break — ChatGPT occasionally changes its DOM. Update the constants at the top of chatgpt_client.py: INPUT_SELECTORS, STOP_BUTTON_SELECTORS, ASSISTANT_MSG_SELECTOR.

Files

File	Purpose
chatgpt_client.py	Core CDP + playwright logic; ask_chatgpt() async entry point
mcp_server.py	FastMCP wrapper exposing review_with_chatgpt tool
test_connect.py	Diagnostic script for the CDP handshake
start-chrome.sh	Launch CDP Chrome from WSL (recommended)
start-chrome.bat	Same, as a double-clickable batch file
requirements.txt	mcp, playwright, httpx

License

MIT.