diff --git a/codex-rs/core/src/error.rs b/codex-rs/core/src/error.rs
index c2bce1a2e72..6818f3c4ad0 100644
--- a/codex-rs/core/src/error.rs
+++ b/codex-rs/core/src/error.rs
@@ -22,7 +22,7 @@ use tokio::task::JoinError;
 pub type Result<T> = std::result::Result<T, CodexErr>;
 
 /// Limit UI error messages to a reasonable size while keeping useful context.
-const ERROR_MESSAGE_UI_MAX_BYTES: usize = 2 * 1024; // 4 KiB
+const ERROR_MESSAGE_UI_MAX_BYTES: usize = 2 * 1024; // 2 KiB
 
 #[derive(Error, Debug)]
 pub enum SandboxErr {