TUI hangs with blank screen on startup (regression in v1.17.1) #32560

Description

opencode (TUI mode) opens a blank terminal screen and hangs. The terminal enters the alternate screen buffer but never renders content. Ctrl-C exits cleanly.

opencode run "<message>" works — only TUI mode is affected. Starting from outside a project directory (e.g. $HOME) also works.

Bisect

Sample

sample of the hung process shows ~99.6% of samples in kevent64 from the TUI event loop. Not CPU-bound — waiting for an event that never arrives.

1693 kevent64 (in libsystem_kernel.dylib) + 8

Environment

• macOS ARM64
• opencode 1.17.7 (Homebrew)
• Reproduces with --pure and with MCP disabled in project config
• Shell: zsh

Reproduction

cd /path/to/any-project-with-agents-md
opencode
# → blank TUI, hangs
# Ctrl-C to exit

# Compare: run mode works
opencode run "hello"

Additional notes

--print-logs --log-level DEBUG produces no log output during the hang — the TUI stalls before logging initializes.