Failed to discover browser connector server. Please ensure it's running.

[jianger666]

[San-Shui]

I also have the same problem.

[fatWill]

I also have the same problem.

[MuMuShy]

I also have the same problem.

[puchunjie]

I found the issue. The reason is that after starting browser-tools-mcp, it cannot detect the browser-tools-server. After checking the source code, I discovered that it uses fetch to check for availability. If your Node version is below 18, it doesn’t have built-in fetch. Upgrading your Node version to 18 or higher should resolve the problem.

[dariusz-wozniak]

My node version is v20.17.0 and I also have the same problem. Yesterday, the MCP tool was working without any issues.

[meisuTJU]

I also have the same problem.
Here in the Mcp configuration, a small green light has already appeared before. I have also started the local service locally through npx @agentdeskai/browser-tools-server@1.2.0. The plugin in the browser shows that it can already connect to the local server. However, it seems that the cursor cannot connect to the locally started server.
I don't why....

@tedjames

[dariusz-wozniak]

@meisuTJU — I'm having exactly the same case.

[savabarbarov96]

+1, I am experiencing this.

[hjgeek]

+1
my version is 1.2.0

[dariusz-wozniak]

I solved the issue.

1. Ensure you're running node v20.x.
2. Run npx @agentdeskai/browser-tools-server@1.2.0.
3. Verify connection in the Chrome extension:

I also removed and re-added extension to the Chrome.

Works fine now:

[ImBIOS]

npx @agentdeskai/browser-tools-server@1.2.0

https://browsertools.agentdesk.ai/installation

[meisuTJU]

@dariusz-wozniak So, is the key measure to solve the problem upgrading the version of node to v20.x?

[dariusz-wozniak]

@dariusz-wozniak So, is the key measure to solve the problem upgrading the version of node to v20.x?

Not sure to be honest, I've done all described steps at once and it helped.

[Wxw-Gu]

node -v ─╯
v20.18.1
is not working

[dariusz-wozniak]

Did you run npx @agentdeskai/browser-tools-server@1.2.0 and verified connection in the Chrome extension?

[tedjames]

Hey, thanks for sharing! There are three components to run this MCP tool:

1. Install our chrome extension
2. Install the MCP server from this command within your IDE (different IDE have different configs but this command is generally a good starting point; please reference your IDEs docs for the proper config setup): npx @agentdeskai/browser-tools-mcp@latest
3. Open a new terminal and run this command: npx @agentdeskai/browser-tools-server@latest

Do note the difference between:

• browser-tools-server (local nodejs server that's a middleware for gathering logs)
  and
• browser-tools-mcp (MCP server that you install into your IDE that communicates w/ the extension + browser-tools-server)

After that, open up your chrome dev tools and then the BrowserToolsMCP panel.

If you're still having issues try these steps:

• Quit / close down your browser. Not just the window but all of Chrome itself.
• Restart the local node server (browser-tools-server)
• Make sure you only have ONE instance of chrome dev tools panel open

After that, it should work but if it doesn't let me know and I can share some more steps to gather logs/info about the issue!