Cursor-ide-browser MCP missing from Agent chats even when Browser Tab is connected

Support Bug Reports
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1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

cursor-ide-browser MCP is not available to the Agent.

Setup

  • Cursor Settings → Browser & Network
  • Browser Automation: Connected to Browser Tab
  • Browser Protection: off
  • Cursor Browser tab is open with a logged-in page

What happens

  • Agent tools are only cursor and cursor-app-control
  • GetDynamicTools(“cursor-ide-browser”) → namespace not found / MCP server does not exist
  • New Agent chat in the same project: same result
  • @Browser does not attach browser tools
  • The visible Browser pane is not enough; the agent cannot call browser_tabs / browser_snapshot / browser_cdp

What I expected

  • Agent should see the existing Browser tab and be able to use cursor-ide-browser tools

Extra

  • Earlier in the same work session the browser tools WERE available, then they disappeared and never came back in new chats

Steps to Reproduce

  1. Open Cursor Browser tab (Settings show Connected to Browser Tab, protection off).
  2. Start an Agent chat in the same project.
  3. Ask the agent if cursor-ide-browser is available.

Expected Behavior

Agent should get cursor-ide-browser tools and see the existing Browser tab.

Operating System

MacOS

Version Information

Version: 2.x.x / VSCode:

Does this stop you from using Cursor

No - Cursor works, but with this issue

5

Hey, thanks for the detailed report. This is a known issue we’re tracking.

What’s happening is that the built-in browser server can drop out of the agent’s tool list during a session, often right after startup or after you change settings, and right now it doesn’t re-register itself, even in new chats. Cursor Settings still correctly shows Connected to Browser Tab, which is why it’s confusing. Your report that it worked at the start of the session, then disappeared and didn’t come back is exactly this case.

For now, the workaround is a full window reload. Open the command palette with Cmd+Shift+P and run Developer: Reload Window. After the reload, new agent chats should see the browser tools again.

If a reload doesn’t bring the tools back, please share your exact Cursor version from Cursor > About Cursor and we’ll dig deeper. I can’t share an ETA for a fix yet, but I’ll update this thread when there’s news.

7

After reloading, can browser_snapshot read the open tab, or are the tools listed but still not working?

9

Hey, @joinwell52 asked the right question. This is exactly what will help us narrow down the cause.

@Ludek_Skyva, after you run Developer: Reload Window, can you check two things and reply here:

  1. Did cursor-ide-browser show up again in the agent tools list in a new chat.
  2. If it did, do calls actually work, for example does browser_snapshot read the currently open tab, or do the tools show up in the list but calls still fail.

These are two different scenarios, and your answer will make it clearer where to dig.

10

After Developer: Reload Window:

  1. cursor-ide-browser in new agent chat: YES

  2. browser_snapshot on the open Browser Tab: WORKS

Workaround confirmed — reload fixes both tool registration and actual calls.

Thank you very much!

11

Hey, thanks for checking and sharing the results, this is exactly what helps narrow down the cause. The fact that reloading restores both the cursor-ide-browser registration and the real calls (since browser_snapshot reads the currently open tab) is a helpful confirmation for us.

For now, please use Developer: Reload Window as a workaround if the tools disappear again during the session. There’s no ETA on a permanent fix yet, but I’ll post an update in this thread as soon as I have one.