File system operations fail on windows with azure provider #4374

Description

File system operations on windows do not work after using own agent in yaml notation with azure based model

With write and edit set to true, the agent will say, that he cannot write to a file.
With bash set to true, it will state, that everything works, but do nothing.

When changing the model manually to opencode/Big Pickle inside the agent and trying again, the file is written.

Expected behaviour: File access permissions should not depend on provider/model selection

OpenCode version

1.0.67

Steps to reproduce

1. create agent in yaml-format in appropriate folder with tool permissions write: true, edit: true, bash: false
2. set model to azure/gpt-5-chat in yaml (or whatever is in your deployment)
3. start opencode
4. switch to agent
5. enter write 'test' to test.md

Screenshot and/or share link

No response

Operating System

Windows 11

Terminal

cmd