Switching from chat/plan mode to agent doesn't work, cannot make edits

What version of Codex is running?

cursor ide extension, latest as per 9/17/25

Which model were you using?

gpt-5-codex

What platform is your computer?

_No response_

What steps can reproduce the bug?

start a conversation in chat, and switch to agent mode.

Model will say that there's no writing access and cannot make edits.

<img width="438" height="107" alt="Image" src="https://github.com/user-attachments/assets/5edb2a32-552e-4391-8877-01bcb041c607" />

What is the expected behavior?

_No response_

What do you see instead?

_No response_

Additional information

_No response_