TUI hangs after a multi-question prompt (question tool, 3 questions) — keys and Ctrl+C unresponsive

Version

1.18.18

Environment

• OS: macOS (darwin)
• Terminal: iTerm2
• Shell: zsh

Summary

When the assistant uses the question tool with 3 questions (each with several options), the TUI occasionally freezes: the prompt renders, but no key presses are processed, Enter does not confirm, and even Ctrl+C does nothing. Only force-quitting the terminal tab (Cmd+W) recovers.

Evidence (from ~/.local/share/opencode/log/opencode.log)

timestamp=2026-08-19T02:51:22.951Z level=INFO run=1b64c3b7 message=asking id=que_017ee37c7001Lagagb98IBJpRm questions=3
timestamp=2026-08-19T02:52:04.300Z level=INFO run=50d90807 message=cleanup prune=7.days
timestamp=2026-08-19T03:10:05.649Z level=INFO run=241dc7a4 message="creating instance" directory=...

Note: after asking questions=3, there was no replied, no rejected, and no error — the backend never received an answer, but the process stayed alive (the cleanup timer kept firing ~40s later), which points to the TUI event loop being stuck rather than the process crashing.

Intermittent (not always reproducible)

Historical log shows questions=3 working fine in other sessions:

• 16:23:02 asking questions=3 → 16:29:57 replied (~7 min, user took time)
• 20:52:56 asking questions=3 → 20:55:58 replied (~3 min)
• 23:13:52 asking questions=3 → 23:16:14 rejected (user pressed Esc)

This hang is the first full freeze (neither replied nor rejected for ~19 min until the user force-quit).

Workaround found

Force-quit and relaunch opencode — session history is preserved in the DB (the same session.id continues after restart).