Subagent's state rendering Markdown content is not rendered correctly in TUI

[vinhnx]

What version of Codex CLI is running?

v0.106.0

What subscription do you have?

Free

Which model were you using?

gpt-5.3-codex xhigh

What platform is your computer?

Darwin 25.3.0 arm64 arm

What terminal emulator and version are you using (if applicable)?

Ghostty

What issue are you seeing?

Hi Codex team, I observe a small rendering bug for Subagent feature. In the Spawn, Completed state, the messages are currently showing plain text, instead of Markdown in the message TUIs.

Thank you!

What steps can reproduce the bug?

Thread ID submitted 019cadc7-aedb-7ff0-9399-e4de1cd523ca

Or just spawn subagents.

What is the expected behavior?

Subagent's state rendering Markdown content should be rendered correctly in the message TUIs like other parts, eg: normal agent's message.

Additional information

Please let me know if you need any more information, thank you!

[palvaleri]

Follow-up: I opened #15001 specifically for the stronger symptom where the subagent TUI corrupts the displayed text itself (dropped characters / whitespace / broken inline-code boundaries) while the raw rollout remains correct.

Keeping this note here only as a cross-link, because that symptom seems broader than the original markdown-rendering report in #13220.