Ctrl+T (toggle reasoning display) does not work in Sessions UI

[armaansood]

Bug

Ctrl+T is documented in /help as "toggle model reasoning display", but pressing it in the Sessions Insiders UI (VS Code-based) has no effect.

Steps to reproduce

1. Open Copilot CLI in Sessions Insiders (VS Code)
2. Remove any conflicting VS Code keybindings for Ctrl+T (e.g., "Go to Symbol in Workspace")
3. Focus the terminal and press Ctrl+T
4. Nothing happens. No reasoning/thinking output is toggled.

Expected behavior

Pressing Ctrl+T should toggle model reasoning display, as documented in /help.

Environment

• Sessions Insiders (VS Code-based terminal)
• Extension: github.copilot-chat-0.42.2026032501
• OS: Windows

Notes

• The keypress likely never reaches the CLI process because the VS Code terminal layer intercepts or drops it, even after removing known conflicting keybindings.
• Consider adding a slash command equivalent (e.g., /reasoning or /thinking) that would work regardless of terminal keybinding conflicts.

[devm33]

I can't reproduce this (on macos at least)

Screen.Recording.2026-03-25.at.23.36.11.mov

[armaansood]

Hey @devm33 , sorry, I don't know why this issue was opened in this repo (I blame Copilot 😃 ). I meant to open it in VSCode's repo - the "show thinking" doesn't work in VSCode/Sessions. Only in CLI on terminal. Not sure if you can do anything about this, feel free to close it.

[armaansood]

Moved: microsoft/vscode#305018