VS Code extension returns invalid_request_error: request body JSON parse error (“Expected end of string… reached end of data”)

What version of the IDE extension are you using?

0.4.78

What subscription do you have?

API

Which IDE are you using?

VS Code

What platform is your computer?

Microsoft Windows NT 10.0.26200.0 x64

What issue are you seeing?

When using the Codex CLI through the VS Code extension, the request fails with an API error indicating the server could not parse the request body as JSON. Error message: { "error": { "type": "invalid_request_error", "message": "Failed to parse request body as json with error: \u0027c\u0027 is invalid after a value. Expected either \u0027,\u0027, \u0027}\u0027, or \u0027]\u0027. LineNumber: 0 | BytePositionInLine: 81178." } }

What steps can reproduce the bug?

1. Open VS Code.
2. Open a project folder
3. Use the VS Code extension (e.g., run a prompt/command via the Codex panel).
4. Submit any prompt (occurs consistently; also reproduced with a minimal prompt).
5. Observe the request fails and returns the JSON parse error shown above.

What is the expected behavior?

_No response_

Additional information

The extension should complete the request successfully.