diff --git a/codex-rs/tui/src/chatwidget.rs b/codex-rs/tui/src/chatwidget.rs
index 787e0980938..132760333d1 100644
--- a/codex-rs/tui/src/chatwidget.rs
+++ b/codex-rs/tui/src/chatwidget.rs
@@ -744,9 +744,8 @@ impl ChatWidget {
                 &ev.call_id,
                 CommandOutput {
                     exit_code: ev.exit_code,
-                    stdout: ev.stdout.clone(),
-                    stderr: ev.stderr.clone(),
                     formatted_output: ev.formatted_output.clone(),
+                    aggregated_output: ev.aggregated_output.clone(),
                 },
                 ev.duration,
             );
diff --git a/codex-rs/tui/src/chatwidget/tests.rs b/codex-rs/tui/src/chatwidget/tests.rs
index 3bfdf243bc9..7f93c2d0b38 100644
--- a/codex-rs/tui/src/chatwidget/tests.rs
+++ b/codex-rs/tui/src/chatwidget/tests.rs
@@ -70,18 +70,26 @@ fn upgrade_event_payload_for_tests(mut payload: serde_json::Value) -> serde_json
         && let Some(m) = msg.as_object_mut()
     {
         let ty = m.get("type").and_then(|v| v.as_str()).unwrap_or("");
-        if ty == "exec_command_end" && !m.contains_key("formatted_output") {
+        if ty == "exec_command_end" {
             let stdout = m.get("stdout").and_then(|v| v.as_str()).unwrap_or("");
             let stderr = m.get("stderr").and_then(|v| v.as_str()).unwrap_or("");
-            let formatted = if stderr.is_empty() {
+            let aggregated = if stderr.is_empty() {
                 stdout.to_string()
             } else {
                 format!("{stdout}{stderr}")
             };
-            m.insert(
-                "formatted_output".to_string(),
-                serde_json::Value::String(formatted),
-            );
+            if !m.contains_key("formatted_output") {
+                m.insert(
+                    "formatted_output".to_string(),
+                    serde_json::Value::String(aggregated.clone()),
+                );
+            }
+            if !m.contains_key("aggregated_output") {
+                m.insert(
+                    "aggregated_output".to_string(),
+                    serde_json::Value::String(aggregated),
+                );
+            }
         }
     }
     payload
diff --git a/codex-rs/tui/src/exec_cell/model.rs b/codex-rs/tui/src/exec_cell/model.rs
index 2893a005dc2..cf9acc54659 100644
--- a/codex-rs/tui/src/exec_cell/model.rs
+++ b/codex-rs/tui/src/exec_cell/model.rs
@@ -3,11 +3,12 @@ use std::time::Instant;
 
 use codex_protocol::parse_command::ParsedCommand;
 
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, Default)]
 pub(crate) struct CommandOutput {
     pub(crate) exit_code: i32,
-    pub(crate) stdout: String,
-    pub(crate) stderr: String,
+    /// The aggregated stderr + stdout interleaved.
+    pub(crate) aggregated_output: String,
+    /// The formatted output of the command, as seen by the model.
     pub(crate) formatted_output: String,
 }
 
@@ -82,9 +83,8 @@ impl ExecCell {
                 call.duration = Some(elapsed);
                 call.output = Some(CommandOutput {
                     exit_code: 1,
-                    stdout: String::new(),
-                    stderr: String::new(),
                     formatted_output: String::new(),
+                    aggregated_output: String::new(),
                 });
             }
         }
diff --git a/codex-rs/tui/src/exec_cell/render.rs b/codex-rs/tui/src/exec_cell/render.rs
index 98d9d072562..bc336b98e80 100644
--- a/codex-rs/tui/src/exec_cell/render.rs
+++ b/codex-rs/tui/src/exec_cell/render.rs
@@ -28,7 +28,6 @@ use unicode_width::UnicodeWidthStr;
 pub(crate) const TOOL_CALL_MAX_LINES: usize = 5;
 
 pub(crate) struct OutputLinesParams {
-    pub(crate) only_err: bool,
     pub(crate) include_angle_pipe: bool,
     pub(crate) include_prefix: bool,
 }
@@ -59,22 +58,12 @@ pub(crate) fn output_lines(
     params: OutputLinesParams,
 ) -> OutputLines {
     let OutputLinesParams {
-        only_err,
         include_angle_pipe,
         include_prefix,
     } = params;
     let CommandOutput {
-        exit_code,
-        stdout,
-        stderr,
-        ..
+        aggregated_output, ..
     } = match output {
-        Some(output) if only_err && output.exit_code == 0 => {
-            return OutputLines {
-                lines: Vec::new(),
-                omitted: None,
-            };
-        }
         Some(output) => output,
         None => {
             return OutputLines {
@@ -84,7 +73,7 @@ pub(crate) fn output_lines(
         }
     };
 
-    let src = if *exit_code == 0 { stdout } else { stderr };
+    let src = aggregated_output;
     let lines: Vec<&str> = src.lines().collect();
     let total = lines.len();
     let limit = TOOL_CALL_MAX_LINES;
@@ -398,7 +387,6 @@ impl ExecCell {
             let raw_output = output_lines(
                 Some(output),
                 OutputLinesParams {
-                    only_err: false,
                     include_angle_pipe: false,
                     include_prefix: false,
                 },
diff --git a/codex-rs/tui/src/history_cell.rs b/codex-rs/tui/src/history_cell.rs
index fe37d5fa09d..e4b33d95725 100644
--- a/codex-rs/tui/src/history_cell.rs
+++ b/codex-rs/tui/src/history_cell.rs
@@ -1156,12 +1156,10 @@ pub(crate) fn new_patch_apply_failure(stderr: String) -> PlainHistoryCell {
         let output = output_lines(
             Some(&CommandOutput {
                 exit_code: 1,
-                stdout: String::new(),
-                stderr,
                 formatted_output: String::new(),
+                aggregated_output: stderr,
             }),
             OutputLinesParams {
-                only_err: true,
                 include_angle_pipe: true,
                 include_prefix: true,
             },
@@ -1602,16 +1600,7 @@ mod tests {
             duration: None,
         });
         // Mark call complete so markers are ✓
-        cell.complete_call(
-            &call_id,
-            CommandOutput {
-                exit_code: 0,
-                stdout: String::new(),
-                stderr: String::new(),
-                formatted_output: String::new(),
-            },
-            Duration::from_millis(1),
-        );
+        cell.complete_call(&call_id, CommandOutput::default(), Duration::from_millis(1));
 
         let lines = cell.display_lines(80);
         let rendered = render_lines(&lines).join("\n");
@@ -1633,16 +1622,7 @@ mod tests {
             duration: None,
         });
         // Call 1: Search only
-        cell.complete_call(
-            "c1",
-            CommandOutput {
-                exit_code: 0,
-                stdout: String::new(),
-                stderr: String::new(),
-                formatted_output: String::new(),
-            },
-            Duration::from_millis(1),
-        );
+        cell.complete_call("c1", CommandOutput::default(), Duration::from_millis(1));
         // Call 2: Read A
         cell = cell
             .with_added_call(
@@ -1654,16 +1634,7 @@ mod tests {
                 }],
             )
             .unwrap();
-        cell.complete_call(
-            "c2",
-            CommandOutput {
-                exit_code: 0,
-                stdout: String::new(),
-                stderr: String::new(),
-                formatted_output: String::new(),
-            },
-            Duration::from_millis(1),
-        );
+        cell.complete_call("c2", CommandOutput::default(), Duration::from_millis(1));
         // Call 3: Read B
         cell = cell
             .with_added_call(
@@ -1675,16 +1646,7 @@ mod tests {
                 }],
             )
             .unwrap();
-        cell.complete_call(
-            "c3",
-            CommandOutput {
-                exit_code: 0,
-                stdout: String::new(),
-                stderr: String::new(),
-                formatted_output: String::new(),
-            },
-            Duration::from_millis(1),
-        );
+        cell.complete_call("c3", CommandOutput::default(), Duration::from_millis(1));
 
         let lines = cell.display_lines(80);
         let rendered = render_lines(&lines).join("\n");
@@ -1714,16 +1676,7 @@ mod tests {
             start_time: Some(Instant::now()),
             duration: None,
         });
-        cell.complete_call(
-            "c1",
-            CommandOutput {
-                exit_code: 0,
-                stdout: String::new(),
-                stderr: String::new(),
-                formatted_output: String::new(),
-            },
-            Duration::from_millis(1),
-        );
+        cell.complete_call("c1", CommandOutput::default(), Duration::from_millis(1));
         let lines = cell.display_lines(80);
         let rendered = render_lines(&lines).join("\n");
         insta::assert_snapshot!(rendered);
@@ -1743,16 +1696,7 @@ mod tests {
             duration: None,
         });
         // Mark call complete so it renders as "Ran"
-        cell.complete_call(
-            &call_id,
-            CommandOutput {
-                exit_code: 0,
-                stdout: String::new(),
-                stderr: String::new(),
-                formatted_output: String::new(),
-            },
-            Duration::from_millis(1),
-        );
+        cell.complete_call(&call_id, CommandOutput::default(), Duration::from_millis(1));
 
         // Small width to force wrapping on both lines
         let width: u16 = 28;
@@ -1772,16 +1716,7 @@ mod tests {
             start_time: Some(Instant::now()),
             duration: None,
         });
-        cell.complete_call(
-            &call_id,
-            CommandOutput {
-                exit_code: 0,
-                stdout: String::new(),
-                stderr: String::new(),
-                formatted_output: String::new(),
-            },
-            Duration::from_millis(1),
-        );
+        cell.complete_call(&call_id, CommandOutput::default(), Duration::from_millis(1));
         // Wide enough that it fits inline
         let lines = cell.display_lines(80);
         let rendered = render_lines(&lines).join("\n");
@@ -1800,16 +1735,7 @@ mod tests {
             start_time: Some(Instant::now()),
             duration: None,
         });
-        cell.complete_call(
-            &call_id,
-            CommandOutput {
-                exit_code: 0,
-                stdout: String::new(),
-                stderr: String::new(),
-                formatted_output: String::new(),
-            },
-            Duration::from_millis(1),
-        );
+        cell.complete_call(&call_id, CommandOutput::default(), Duration::from_millis(1));
         let lines = cell.display_lines(24);
         let rendered = render_lines(&lines).join("\n");
         insta::assert_snapshot!(rendered);
@@ -1827,16 +1753,7 @@ mod tests {
             start_time: Some(Instant::now()),
             duration: None,
         });
-        cell.complete_call(
-            &call_id,
-            CommandOutput {
-                exit_code: 0,
-                stdout: String::new(),
-                stderr: String::new(),
-                formatted_output: String::new(),
-            },
-            Duration::from_millis(1),
-        );
+        cell.complete_call(&call_id, CommandOutput::default(), Duration::from_millis(1));
         let lines = cell.display_lines(80);
         let rendered = render_lines(&lines).join("\n");
         insta::assert_snapshot!(rendered);
@@ -1855,16 +1772,7 @@ mod tests {
             start_time: Some(Instant::now()),
             duration: None,
         });
-        cell.complete_call(
-            &call_id,
-            CommandOutput {
-                exit_code: 0,
-                stdout: String::new(),
-                stderr: String::new(),
-                formatted_output: String::new(),
-            },
-            Duration::from_millis(1),
-        );
+        cell.complete_call(&call_id, CommandOutput::default(), Duration::from_millis(1));
         let lines = cell.display_lines(28);
         let rendered = render_lines(&lines).join("\n");
         insta::assert_snapshot!(rendered);
@@ -1891,9 +1799,8 @@ mod tests {
             &call_id,
             CommandOutput {
                 exit_code: 1,
-                stdout: String::new(),
-                stderr,
                 formatted_output: String::new(),
+                aggregated_output: stderr,
             },
             Duration::from_millis(1),
         );
@@ -1935,9 +1842,8 @@ mod tests {
             &call_id,
             CommandOutput {
                 exit_code: 1,
-                stdout: String::new(),
-                stderr,
                 formatted_output: String::new(),
+                aggregated_output: stderr,
             },
             Duration::from_millis(5),
         );
diff --git a/codex-rs/tui/src/pager_overlay.rs b/codex-rs/tui/src/pager_overlay.rs
index 84c325b6cbd..b02e02ef73b 100644
--- a/codex-rs/tui/src/pager_overlay.rs
+++ b/codex-rs/tui/src/pager_overlay.rs
@@ -724,8 +724,7 @@ mod tests {
             "exec-1",
             CommandOutput {
                 exit_code: 0,
-                stdout: "src\nREADME.md\n".into(),
-                stderr: String::new(),
+                aggregated_output: "src\nREADME.md\n".into(),
                 formatted_output: "src\nREADME.md\n".into(),
             },
             Duration::from_millis(420),