Codex VS Code extension crashes immediately with "Custom tool call output is missing" (SIGTRAP)

What version of the IDE extension are you using?

26.623.61825

What subscription do you have?

ChatGPT Pro

Which IDE are you using?

Visual Studio Code 1.101.x

What platform is your computer?

macOS 15.7.7 (Darwin 24.6.0) x86_64

What issue are you seeing?

The Codex VS Code extension crashes immediately after opening the Codex panel.

The extension was working normally until Friday. Today it crashes before responding to any prompt.

The regular ChatGPT chat panel inside VS Code works normally. Only the Codex panel crashes.

I have already tried all of the following:

• Restarting VS Code
• Restarting macOS
• Signing out and signing back in
• Reinstalling the extension
• Switching between Release and Pre-release versions
• Installing several previous extension versions
• Deleting the ~/.codex directory
• Deleting Codex logs and state databases
• Resetting config.toml to the minimal configuration
• Disabling other AI extensions (EasyCode)
• Testing in a clean VS Code window

The issue still occurs.

The most common error is:

Codex process errored: Codex app-server process exited unexpectedly (code=unknown, signal=SIGTRAP)

Last CLI error:
codex_core::util: Custom tool call output is missing for call id: ...

Other errors I encountered while troubleshooting included:

Codex process is not available

unknown feature key in config: thread_tools

prompt must be at most 128 characters

Those errors disappeared after cleaning the configuration, but the SIGTRAP / "Custom tool call output is missing" crash remains.

This started today. The extension worked correctly on Friday.

What steps can reproduce the bug?

1. Open Visual Studio Code.
2. Open any project (or even an empty folder).
3. Open the Codex panel.
4. Type any prompt (for example: "Hello").
5. Press Enter.

Expected result:
Codex responds normally.

Actual result:
The Codex process immediately crashes with:

Codex process errored: Codex app-server process exited unexpectedly (SIGTRAP)

Last CLI error:
codex_core::util: Custom tool call output is missing for call id...

What is the expected behavior?

The issue is fully reproducible.

Regular ChatGPT works inside VS Code.

Only the Codex extension crashes.

Additional information

<img width="285" height="649" alt="Image" src="https://github.com/user-attachments/assets/9cf733ec-5ae9-4b00-8e5b-e5adba13a7e9" />