Treat user shell turns as non-steerable

codex-rs/core/src/codex.rs

@@ -216,6 +216,7 @@ impl SteerInputError {
                 let turn_kind_label = match turn_kind {
                     NonSteerableTurnKind::Review => "review",
                     NonSteerableTurnKind::Compact => "compact",
+                    NonSteerableTurnKind::UserShell => "user shell",
                 };
                 ErrorEvent {
                     message: format!("cannot steer a {turn_kind_label} turn"),
@@ -2787,6 +2788,11 @@ impl Session {
                     turn_kind: NonSteerableTurnKind::Compact,
                 });
             }
+            Some(crate::state::TaskKind::UserShell) => {
+                return Err(SteerInputError::ActiveTurnNotSteerable {
+                    turn_kind: NonSteerableTurnKind::UserShell,
+                });
+            }
             None => return Err(SteerInputError::NoActiveTurn(input)),
         }
 

codex-rs/core/src/codex_tests.rs

@@ -5391,6 +5391,7 @@ async fn steer_input_rejects_non_regular_turns() {
     for (task_kind, turn_kind) in [
         (TaskKind::Review, NonSteerableTurnKind::Review),
         (TaskKind::Compact, NonSteerableTurnKind::Compact),
+        (TaskKind::UserShell, NonSteerableTurnKind::UserShell),
     ] {
         let (sess, _tc, _rx) = make_session_and_context_with_rx().await;
         let input = vec![UserInput::Text {

codex-rs/core/src/state/turn.rs

@@ -64,6 +64,7 @@ pub(crate) enum TaskKind {
     Regular,
     Review,
     Compact,
+    UserShell,
 }
 
 pub(crate) struct RunningTask {

codex-rs/core/src/tasks/user_shell.rs

@@ -63,7 +63,7 @@ impl UserShellCommandTask {
 
 impl SessionTask for UserShellCommandTask {
     fn kind(&self) -> TaskKind {
-        TaskKind::Regular
+        TaskKind::UserShell
     }
 
     fn span_name(&self) -> &'static str {