diff --git a/codex-rs/app-server-protocol/src/protocol/v2.rs b/codex-rs/app-server-protocol/src/protocol/v2.rs
index f1d8392135..e35a54ed3e 100644
--- a/codex-rs/app-server-protocol/src/protocol/v2.rs
+++ b/codex-rs/app-server-protocol/src/protocol/v2.rs
@@ -1126,6 +1126,10 @@ pub enum ThreadItem {
         id: String,
         changes: Vec<FileUpdateChange>,
         status: PatchApplyStatus,
+        /// Captured stdout (summary printed by the underlying `apply_patch` tool call).
+        stdout: Option<String>,
+        /// Captured stderr (parser errors, IO failures, etc.).
+        stderr: Option<String>,
     },
     #[serde(rename_all = "camelCase")]
     #[ts(rename_all = "camelCase")]
diff --git a/codex-rs/app-server/src/bespoke_event_handling.rs b/codex-rs/app-server/src/bespoke_event_handling.rs
index df4cdb8980..64062d30ab 100644
--- a/codex-rs/app-server/src/bespoke_event_handling.rs
+++ b/codex-rs/app-server/src/bespoke_event_handling.rs
@@ -136,6 +136,8 @@ pub(crate) async fn apply_bespoke_event_handling(
                         id: item_id.clone(),
                         changes: patch_changes.clone(),
                         status: PatchApplyStatus::InProgress,
+                        stdout: None,
+                        stderr: None,
                     };
                     let notification = ItemStartedNotification {
                         thread_id: conversation_id.to_string(),
@@ -462,6 +464,8 @@ pub(crate) async fn apply_bespoke_event_handling(
                     id: item_id.clone(),
                     changes: convert_patch_changes(&patch_begin_event.changes),
                     status: PatchApplyStatus::InProgress,
+                    stdout: None,
+                    stderr: None,
                 };
                 let notification = ItemStartedNotification {
                     thread_id: conversation_id.to_string(),
@@ -489,6 +493,8 @@ pub(crate) async fn apply_bespoke_event_handling(
                 item_id,
                 changes,
                 status,
+                Some(patch_end_event.stdout),
+                Some(patch_end_event.stderr),
                 event_turn_id.clone(),
                 outgoing.as_ref(),
                 &turn_summary_store,
@@ -738,11 +744,14 @@ async fn emit_turn_completed_with_status(
         .await;
 }
 
+#[allow(clippy::too_many_arguments)]
 async fn complete_file_change_item(
     conversation_id: ConversationId,
     item_id: String,
     changes: Vec<FileUpdateChange>,
     status: PatchApplyStatus,
+    stdout: Option<String>,
+    stderr: Option<String>,
     turn_id: String,
     outgoing: &OutgoingMessageSender,
     turn_summary_store: &TurnSummaryStore,
@@ -758,6 +767,8 @@ async fn complete_file_change_item(
         id: item_id,
         changes,
         status,
+        stdout,
+        stderr,
     };
     let notification = ItemCompletedNotification {
         thread_id: conversation_id.to_string(),
@@ -1068,6 +1079,8 @@ async fn on_file_change_request_approval_response(
             item_id,
             changes,
             status,
+            None,
+            None,
             event_turn_id.clone(),
             outgoing.as_ref(),
             &turn_summary_store,
diff --git a/codex-rs/app-server/tests/suite/v2/turn_start.rs b/codex-rs/app-server/tests/suite/v2/turn_start.rs
index e4cd722947..f91751b774 100644
--- a/codex-rs/app-server/tests/suite/v2/turn_start.rs
+++ b/codex-rs/app-server/tests/suite/v2/turn_start.rs
@@ -688,12 +688,16 @@ async fn turn_start_file_change_approval_v2() -> Result<()> {
         ref id,
         status,
         ref changes,
+        stdout,
+        stderr,
     } = started_file_change
     else {
         unreachable!("loop ensures we break on file change items");
     };
     assert_eq!(id, "patch-call");
     assert_eq!(status, PatchApplyStatus::InProgress);
+    assert!(stdout.is_none());
+    assert!(stderr.is_none());
     let started_changes = changes.clone();
 
     let server_req = timeout(
@@ -763,11 +767,20 @@ async fn turn_start_file_change_approval_v2() -> Result<()> {
         }
     })
     .await??;
-    let ThreadItem::FileChange { ref id, status, .. } = completed_file_change else {
+    let ThreadItem::FileChange {
+        ref id,
+        status,
+        stdout,
+        stderr,
+        ..
+    } = completed_file_change
+    else {
         unreachable!("loop ensures we break on file change items");
     };
     assert_eq!(id, "patch-call");
     assert_eq!(status, PatchApplyStatus::Completed);
+    assert!(stdout.is_some());
+    assert!(stderr.is_some());
 
     timeout(
         DEFAULT_READ_TIMEOUT,
@@ -854,12 +867,16 @@ async fn turn_start_file_change_approval_decline_v2() -> Result<()> {
         ref id,
         status,
         ref changes,
+        stdout,
+        stderr,
     } = started_file_change
     else {
         unreachable!("loop ensures we break on file change items");
     };
     assert_eq!(id, "patch-call");
     assert_eq!(status, PatchApplyStatus::InProgress);
+    assert!(stdout.is_none());
+    assert!(stderr.is_none());
     let started_changes = changes.clone();
 
     let server_req = timeout(
@@ -909,11 +926,20 @@ async fn turn_start_file_change_approval_decline_v2() -> Result<()> {
         }
     })
     .await??;
-    let ThreadItem::FileChange { ref id, status, .. } = completed_file_change else {
+    let ThreadItem::FileChange {
+        ref id,
+        status,
+        stdout,
+        stderr,
+        ..
+    } = completed_file_change
+    else {
         unreachable!("loop ensures we break on file change items");
     };
     assert_eq!(id, "patch-call");
     assert_eq!(status, PatchApplyStatus::Declined);
+    assert!(stdout.is_none());
+    assert!(stderr.is_none());
 
     timeout(
         DEFAULT_READ_TIMEOUT,