Where does the bug appear (feature/product)?
Cursor IDE
Describe the Bug
When using Grok 4.5 in Cursor Agent, the model cannot access the AskQuestion tool. If prompted to use it, the model reports that the tool is not available and suggests switching to Plan mode, but Plan mode behaves the same way.
Composer 2.5 can access AskQuestion normally. Even when Composer 2.5 provides explicit instructions for Grok to call AskQuestion, Grok still cannot use it and asks questions inline in chat instead.
This looks like a model-specific tool availability or routing issue, not a user workflow problem.
Steps to Reproduce
Open Cursor Agent and select Grok 4.5 as the model.
Start a task where the agent needs a structured user choice (e.g. “Use AskQuestion to ask me which authentication approach to use”).
Observe Grok’s response.
Also tested:
Switch to Plan mode with Grok 4.5 and repeat step 2.
Switch to Composer 2.5, run the same prompt — AskQuestion works.
Ask Composer 2.5 to produce exact instructions for Grok on how/when to call AskQuestion.
Start a new Grok 4.5 session with those instructions.
Grok still does not call AskQuestion; it asks the same questions inline in prose.
Expected Behavior
Grok 4.5 should have access to the same AskQuestion tool as Composer 2.5 when the tool is enabled for the session.
When appropriate, Grok should invoke AskQuestion with structured multiple-choice options instead of asking inline in chat.
Plan mode should not be suggested as a workaround if the tool is equally unavailable there.
Operating System
MacOS
Version Information
Version: 3.9.16
VS Code Extension API: 1.105.1
Commit: 042b3c1a4c53f2c3808067f519fbfc67b72cad80
Date: 2026-06-27T06:41:01.941Z (1 wk ago)
Layout: editor
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.256
OS: Darwin arm64 24.6.0
For AI issues: which model did you use?
Cursor Grok 4.5
Does this stop you from using Cursor
No - Cursor works, but with this issue