From aea299c5ebd6e1f3ae45a2559a2b30549c8c2a0b Mon Sep 17 00:00:00 2001
From: Michael Bolin <mbolin@openai.com>
Date: Tue, 7 Oct 2025 19:30:32 -0700
Subject: [PATCH] fix: tui launch latency by disabling osc probe

---
 codex-rs/tui/src/terminal_palette.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/codex-rs/tui/src/terminal_palette.rs b/codex-rs/tui/src/terminal_palette.rs
index c35b2cfff4..53fc5fecdd 100644
--- a/codex-rs/tui/src/terminal_palette.rs
+++ b/codex-rs/tui/src/terminal_palette.rs
@@ -104,6 +104,12 @@ mod imp {
             return Ok(None);
         }
 
+        // Many modern GPU terminals ignore OSC, so only perform the query on
+        // terminals known to support it.
+        if !codex_core::terminal::user_agent().starts_with("iTerm.app") {
+            return Ok(None);
+        }
+
         let mut tty = match OpenOptions::new().read(true).write(true).open("/dev/tty") {
             Ok(file) => file,
             Err(_) => return Ok(None),