GitHub Copilot in Agent mode consistently omits first character when using Git Bash in terminal.

[garretwilson]

I'm using Git Bash with Java 25 in the terminal on Windows 11.

When using "Agent" mode, the LLM will often want to run some tests to see if its work is correct. It will ask to run e.g. Maven:

mvn test -Dtest=FooBarTest

Unfortunately a large percentage of the time, the first letter of its command will be cut off, causing the command to fail:

$ vn test -Dtest=FooBarTest
bash: vn: command not found

Sometimes the LLM can recover, but often it thinks it was in the wrong directory and tries the command again but first changing to the directory (which it was already in).

I'm glad the LLM is resilient, but I'm worried that this issue of missing the first letter of a command in the terminal is a larger systemic issue.

[LauraCSDev]

same here

[Tyriar]

I believe this is already fixed, can you see if you can reproduce in the Insiders build? Let us know if not.

[garretwilson]

This is still happening in the October 2025 release. 😢 Please reopen.

Version: 1.106.0 (user setup)
Commit: ac4cbdf48759c7d8c3eb91ffe6bb04316e263c57
Date: 2025-11-11T16:02:25.943Z
Electron: 37.7.0
ElectronBuildId: 12597478
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Windows_NT x64 10.0.26100

[bearx3f]

I’ve noticed that whenever Copilot drops the first character, VS Code simultaneously opens a new terminal, and I’m wondering if VS Code might be misinterpreting one of the characters sent by Copilot as a command to spawn an extra terminal.

[jlhervy]

I believe this is already fixed, can you see if you can reproduce in the Insiders build? Let us know if not.

This is still happening even on insiders. It it not the same thing as the problem in the issue, it is the first character of each command that is skipped in the terminal. (bash for me)

[garretwilson]

@Tyriar can you please reopen this? It was closed without verifying it was fixed, and it is not fixed.

[garretwilson]

This is really, really starting to get irritating.

Note that it usually happens when the LLM creates its own separate terminal in order to run commands (even though I already have one open). The earlier comment about this being somehow related to open a terminal may have some validity.

When the command fails because there is no such command, the LLM tries to run a different command. Rather than approving the command, I tell it that there is a GitHub Copilot bug that cut off the first characters, and for it to rerun the previous command. It does so, and that time it will run with no problem.

Please raise the priority of this.

[u84six]

I believe this is already fixed, can you see if you can reproduce in the Insiders build? Let us know if not.

This is not fixed in 1.106.0. I can confirm that it's still an issue