3.18.9 Linux Glass: cursor-ide-browser MCP disposed after No browser view — 30s re-register timeout

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Still broken on 3.18.9 (Linux Ubuntu 24.04 x64, Glass). Adding a local-agent repro that matches this thread’s No browser view available and also explains the 30s “re-register” failure the agent sees.

Error the agent gets

Server not found: cursor-ide-browser (MCP provider did not re-register within 30000ms)

GetDynamicTools can still list cursor-ide-browser as namespaceStatus: ready (stale catalog). The next CallDynamicTool then waits 30s and dies. Retrying the same call burns another 30s.

Logs (every new Glass workbench today)

~/.config/Cursor/logs/20260902T083539/window1_wb*/…/1-Cursor IDE Browser Automation.log

On all 11 workbenches (wb0–wb10):

Cursor Browser Automation extension activated
Using Browser MCP provider
injectBrowserUIScript called
[ERROR] Failed to inject browser UI script:: No browser view available
    at …/workbench.glass.main.js

On wb10 (created 09:52 local, same second as a move_agent_to_root abort):

Browser Automation MCP Provider disposed

After that dispose, browser MCP stays dead in the chat. Reproduced again at 10:08 by calling browser_tabs — same 30s re-register timeout, no new workbench.

Why it happens here

  • Glass + many workbenches in one Cursor window
  • move_agent_to_root (even when the destination folder is already in the multi-root workspace) spawns a new workbench
  • Extension activates before any Simple Browser view exists → inject fails once → provider disposed → no retry
  • Same race this thread already described; Reload Window is not a fix

Expected

  • If no browser view yet: keep the provider alive and inject when the first tab/view appears
  • Do not dispose after a single failed inject
  • Do not advertise tools as ready after dispose
  • Fail the tool in <1s, not after a 30s re-register wait
  • move_agent_to_root to an already-open multi-root folder must be a no-op (related: #169527)

Environment

  • Cursor 3.18.9 (2ba48ff), stable, Linux x64, Glass
  • Local Agent, not Cloud / not Remote-SSH
  • Multi-root .code-workspace (11 folders)

Related closed thread: Browser MCP Tools Not Available
Related move_agent_to_root: Move_agent_to_root aborts the in-flight turn and never resumes (“Switching workspace root”, then silence)

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3 posts were merged into an existing topic: Stale cursor-ide-browser provider disposal removes newer registration and leaves MCP catalog ready