TUI freeze and show stray ANSI escape codes with piped or redirected stdin

[LordMikkel]

Description

What happened

Running opencode < instructions.txt or "echo hello | opencode" opens the TUI, but input becomes unusable (ANSI noise, no interaction).

Actual behavior

The TUI becomes unresponsive and shows stray ANSI characters.

Expected behavior

The prompt is auto-submitted and the TUIstays interactive.

Plugins

No response

OpenCode version

1.15.5

Steps to reproduce

1. opencode < test-prompt.txt
2. echo hello | opencode

Screenshot and/or share link

Operating System

Linux (Arch)

Terminal

Ghostty

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• Bug: Piping stdin into TUI breaks rendering (reproduced) #24195: Bug: Piping stdin into TUI breaks rendering (reproduced) — same echo test | opencode trigger, same ANSI rendering breakage
• Bug: Stdin piping breaks UI #3871: Bug: Stdin piping breaks UI (closed) — same root cause, stdin pipe breaking the TUI renderer