Where does the bug appear (feature/product)?
Cursor IDE
Describe the Bug
Cursor version: 3.17.8 (stable channel, already confirmed up to date via Check for Updates)
OS: macOS, Apple Silicon (arm64)
Setup: Working entirely locally (not Remote-SSH — confirmed status bar shows “This Mac”)
Getting recurring “Agent Execution Timed Out” errors (ERROR_EXTENSION_HOST_TIMEOUT). Console shows the extension host repeatedly terminating unexpectedly (Code: 6) while these extensions were running: anysphere.cursor-agent-exec, anysphere.cursor-checkout, anysphere.cursor-retrieval, vscode.git, vscode.git-base. Provider registration for agent-exec times out and retries up to 9 times before failing.
Sample Request ID: 0934d09c-9763-4c47-8259-8c480a095f08
Already tried: force quitting and relaunching Cursor, confirming no update is available. Issue persists.
Steps to Reproduce
Issue appears to occur intermittently, not from a specific reproducible action:
Open Cursor and start a new conversation with the Agent/Composer (chat panel)
Send a message that requires the agent to execute a tool call
Agent returns “No first token received” warnings, followed by repeated “[agent-exec] Provider registration timed out” retries (up to 9 attempts)
Request ultimately fails with “Agent Execution Timed Out” (ERROR_EXTENSION_HOST_TIMEOUT)
Console confirms the extension host process terminated unexpectedly (Code: 6) while anysphere.cursor-agent-exec was running
Not consistently reproducible on demand — recurs periodically during normal use rather than after one specific trigger action.
Expected Behavior
The Agent should execute the request normally and return a response without the extension host crashing or timing out.
Operating System
MacOS
Version Information
Version: 3.17.8 (Universal)
VS Code Extension API: 1.128.0
Commit: 2fdd31c9f33f7fbe501f2d57772dc5bf64b63620
Date: 2026-08-20T02:18:12.724Z
Layout: Agent Window
Build Type: Stable
Release Track: Default
Electron: 40.10.3
Chromium: 144.0.7559.236
Node.js: 24.15.0
V8: 14.4.258.32-electron.0
xterm.js: 6.1.0-beta.291
OS: Darwin arm64 25.5.0
For AI issues: which model did you use?
auto
For AI issues: add Request ID with privacy disabled
0934d09c-9763-4c47-8259-8c480a095f08
Additional Information
From the console logs already captured:
The specific crash signal: Code: 6, Signal: unknown
It’s not a one-off — you saw it recur multiple times in a single session, with the same [agent-exec] Provider registration timed out pattern retrying up to attempt 9/9 each time before failing
Related errors appearing alongside it: PluginsProviderService Timed out waiting for plugins provider after 30000ms, BrowserSnapshotWatchdog Failed to trigger browser snapshot backfill, and CodebaseTelemetry Trigger snapshot command failed
Worth mentioning if true:
Whether it happens on every agent request now, or only some of the time
Whether it’s tied to a particular kind of request (e.g., ones that involve running a terminal command, editing a large file, or right after your Mac wakes from sleep) — if you’ve noticed any pattern
How long you’d had Cursor open / how many agent messages you’d sent before it first happened that session
Attach if the form allows file uploads:
One or two of the console screenshots you shared with me earlier — the ones showing the “Extension Host” section and the “[composer] Error in AI response” block are the most diagnostic, since they show the actual stack trace
Does this stop you from using Cursor
Yes - Cursor is unusable