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TUI freeze during agent fan-out #16688
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TUIIssues related to the terminal user interface: text input, menus and dialogs, and terminal displayIssues related to the terminal user interface: text input, menus and dialogs, and terminal displaybugSomething isn't workingSomething isn't workingperformancesubagentIssues involving subagents or multi-agent featuresIssues involving subagents or multi-agent features
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TUIIssues related to the terminal user interface: text input, menus and dialogs, and terminal displayIssues related to the terminal user interface: text input, menus and dialogs, and terminal displaybugSomething isn't workingSomething isn't workingperformancesubagentIssues involving subagents or multi-agent featuresIssues involving subagents or multi-agent features
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What version of Codex CLI is running?
codex-cli 0.118.0
What subscription do you have?
Codex Pro
Which model were you using?
gpt-5.4
What platform is your computer?
Microsoft Windows NT 10.0.22631.0 x64
What terminal emulator and version are you using (if applicable)?
Windows Terminal (Command Prompt)
What issue are you seeing?
When spawning a large number of sub-agents (e.g. 100), the TUI becomes completely unresponsive.
What steps can reproduce the bug?
What is the expected behavior?
The TUI should remain responsive and codex should not freeze indefinitely.
Additional information
I've already fixed this issue locally, but like for the other issue I opened I noticed that PRs require approval before being opened.
I wanted to attach videos directly, but for whatever reason GitHub is not allowing me: https://streamable.com/63gerb