diff --git a/codex-rs/tui/src/snapshots/codex_tui__status_indicator_widget__summary_shimmer__tests__short_and_long_labels_sweep_smoothly_in_both_themes.snap b/codex-rs/tui/src/snapshots/codex_tui__status_indicator_widget__summary_shimmer__tests__short_and_long_labels_sweep_smoothly_in_both_themes.snap
index 482ec825dc..2e4636199a 100644
--- a/codex-rs/tui/src/snapshots/codex_tui__status_indicator_widget__summary_shimmer__tests__short_and_long_labels_sweep_smoothly_in_both_themes.snap
+++ b/codex-rs/tui/src/snapshots/codex_tui__status_indicator_widget__summary_shimmer__tests__short_and_long_labels_sweep_smoothly_in_both_themes.snap
@@ -1,35 +1,40 @@
 ---
 source: tui/src/summary_shimmer_tests.rs
-assertion_line: 27
 expression: "frames.join(\"\\n\")"
 ---
 dark Working 0ms: [128, 128, 128, 128, 128, 128, 128]
-dark Working 500ms: [238, 198, 144, 128, 128, 128, 128]
-dark Working 1000ms: [128, 156, 212, 240, 212, 156, 128]
-dark Working 1500ms: [128, 128, 128, 128, 144, 198, 238]
-dark Working 2000ms: [128, 128, 128, 128, 128, 128, 128]
+dark Working 850ms: [238, 198, 144, 128, 128, 128, 128]
+dark Working 1100ms: [128, 156, 212, 240, 212, 156, 128]
+dark Working 1350ms: [128, 128, 128, 128, 144, 198, 238]
+dark Working 3600ms: [128, 128, 128, 128, 128, 128, 128]
+dark Working 5100ms: [128, 156, 212, 240, 212, 156, 128]
 dark Preparing bootstrap diagnostics 0ms: [128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128]
-dark Preparing bootstrap diagnostics 500ms: [128, 128, 128, 132, 175, 226, 237, 198, 145, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128]
-dark Preparing bootstrap diagnostics 1000ms: [128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 159, 213, 240, 213, 159, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128]
-dark Preparing bootstrap diagnostics 1500ms: [128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 145, 198, 237, 226, 175, 132, 128, 128, 128]
-dark Preparing bootstrap diagnostics 2000ms: [128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128]
+dark Preparing bootstrap diagnostics 850ms: [128, 128, 128, 132, 175, 226, 237, 198, 145, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128]
+dark Preparing bootstrap diagnostics 1100ms: [128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 159, 213, 240, 213, 159, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128]
+dark Preparing bootstrap diagnostics 1350ms: [128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 145, 198, 237, 226, 175, 132, 128, 128, 128]
+dark Preparing bootstrap diagnostics 3600ms: [128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128]
+dark Preparing bootstrap diagnostics 5100ms: [128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 159, 213, 240, 213, 159, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128]
 dark 界é界 0ms: [128, 128, 128]
-dark 界é界 500ms: [198, 129, 128]
-dark 界é界 1000ms: [184, 240, 184]
-dark 界é界 1500ms: [128, 129, 198]
-dark 界é界 2000ms: [128, 128, 128]
+dark 界é界 850ms: [198, 129, 128]
+dark 界é界 1100ms: [184, 240, 184]
+dark 界é界 1350ms: [128, 129, 198]
+dark 界é界 3600ms: [128, 128, 128]
+dark 界é界 5100ms: [184, 240, 184]
 light Working 0ms: [128, 128, 128, 128, 128, 128, 128]
-light Working 500ms: [17, 57, 111, 128, 128, 128, 128]
-light Working 1000ms: [128, 100, 44, 16, 44, 100, 128]
-light Working 1500ms: [128, 128, 128, 128, 111, 57, 17]
-light Working 2000ms: [128, 128, 128, 128, 128, 128, 128]
+light Working 850ms: [17, 57, 111, 128, 128, 128, 128]
+light Working 1100ms: [128, 100, 44, 16, 44, 100, 128]
+light Working 1350ms: [128, 128, 128, 128, 111, 57, 17]
+light Working 3600ms: [128, 128, 128, 128, 128, 128, 128]
+light Working 5100ms: [128, 100, 44, 16, 44, 100, 128]
 light Preparing bootstrap diagnostics 0ms: [128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128]
-light Preparing bootstrap diagnostics 500ms: [128, 128, 128, 123, 80, 29, 18, 57, 110, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128]
-light Preparing bootstrap diagnostics 1000ms: [128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 127, 96, 42, 16, 42, 96, 127, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128]
-light Preparing bootstrap diagnostics 1500ms: [128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 110, 57, 18, 29, 80, 123, 128, 128, 128]
-light Preparing bootstrap diagnostics 2000ms: [128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128]
+light Preparing bootstrap diagnostics 850ms: [128, 128, 128, 123, 80, 29, 18, 57, 110, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128]
+light Preparing bootstrap diagnostics 1100ms: [128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 127, 96, 42, 16, 42, 96, 127, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128]
+light Preparing bootstrap diagnostics 1350ms: [128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 110, 57, 18, 29, 80, 123, 128, 128, 128]
+light Preparing bootstrap diagnostics 3600ms: [128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128]
+light Preparing bootstrap diagnostics 5100ms: [128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 127, 96, 42, 16, 42, 96, 127, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128]
 light 界é界 0ms: [128, 128, 128]
-light 界é界 500ms: [57, 126, 128]
-light 界é界 1000ms: [72, 16, 72]
-light 界é界 1500ms: [128, 126, 57]
-light 界é界 2000ms: [128, 128, 128]
+light 界é界 850ms: [57, 126, 128]
+light 界é界 1100ms: [72, 16, 72]
+light 界é界 1350ms: [128, 126, 57]
+light 界é界 3600ms: [128, 128, 128]
+light 界é界 5100ms: [72, 16, 72]
diff --git a/codex-rs/tui/src/summary_shimmer.rs b/codex-rs/tui/src/summary_shimmer.rs
index 16fab1f580..2bae071405 100644
--- a/codex-rs/tui/src/summary_shimmer.rs
+++ b/codex-rs/tui/src/summary_shimmer.rs
@@ -1,8 +1,9 @@
-//! Smooth, whole-grapheme status shimmer with a two-second sweep.
+//! Smooth, whole-grapheme status shimmer with the desktop's cadenced sweep.
 //!
 //! Only brightness changes: the moving band uses the terminal foreground, while
 //! the remaining text blends halfway into the background. The wave spans at
 //! least six terminal columns so short labels do not flash one letter at a time.
+//! New headers wait 600 ms, then sweep for one second every four seconds.
 //! Unknown palettes use static dim text instead of a stepped animation.
 
 use std::time::Duration;
@@ -20,6 +21,11 @@ use crate::terminal_palette::default_fg;
 use crate::terminal_palette::effective_stdout_color_level;
 use crate::terminal_palette::rgb_color;
 
+// Match the desktop app's thinking and reasoning header timings.
+const START_DELAY: Duration = Duration::from_millis(/*millis*/ 600);
+const SWEEP_SECONDS: f64 = 1.0;
+const INTERVAL_SECONDS: f64 = 4.0;
+
 pub(crate) fn summary_shimmer(
     text: &str,
     elapsed: Duration,
@@ -35,7 +41,9 @@ pub(crate) fn summary_shimmer(
     };
     let width = text.width() as f64;
     let half_width = (width * 0.1).max(/*other*/ 3.0);
-    let position = (elapsed.as_secs_f64() % 2.0) / 2.0 * (width + 2.0 * half_width) - half_width;
+    let sweep =
+        (elapsed.saturating_sub(START_DELAY).as_secs_f64() % INTERVAL_SECONDS).min(SWEEP_SECONDS);
+    let position = sweep / SWEEP_SECONDS * (width + 2.0 * half_width) - half_width;
     let mut column = 0.0;
     text.graphemes(/*is_extended*/ true)
         .map(|grapheme| {
diff --git a/codex-rs/tui/src/summary_shimmer_tests.rs b/codex-rs/tui/src/summary_shimmer_tests.rs
index a14cd8cc38..04fd9ade20 100644
--- a/codex-rs/tui/src/summary_shimmer_tests.rs
+++ b/codex-rs/tui/src/summary_shimmer_tests.rs
@@ -25,7 +25,8 @@ fn short_and_long_labels_sweep_smoothly_in_both_themes() {
     ] {
         with_test_default_colors(colors, || {
             for text in ["Working", "Preparing bootstrap diagnostics", "界e\u{301}界"] {
-                for ms in [0, 500, 1000, 1500, 2000] {
+                // Initial delay, the first sweep, the gap, and the next sweep.
+                for ms in [0, 850, 1100, 1350, 3600, 5100] {
                     let spans =
                         summary_shimmer(text, Duration::from_millis(ms), MotionMode::Animated);
                     let levels = spans
@@ -52,7 +53,8 @@ fn working_has_overlapping_highlights_without_frame_to_frame_flashes() {
         },
         || {
             let mut previous = Vec::new();
-            for ms in (0..=2000).step_by(/*step*/ 16) {
+            // Sample two sweeps and the intervening gap at the status row's 32 ms cadence.
+            for ms in (0..=5600).step_by(/*step*/ 32) {
                 let spans =
                     summary_shimmer("Working", Duration::from_millis(ms), MotionMode::Animated);
                 let brightness = spans
@@ -66,13 +68,15 @@ fn working_has_overlapping_highlights_without_frame_to_frame_flashes() {
                     assert!(brightness.iter().filter(|value| **value > 160).count() >= 2);
                 }
                 for (current, previous) in brightness.iter().zip(&previous) {
-                    assert!(u8::abs_diff(*current, *previous) <= 7);
+                    // At this speed the cosine band's maximum change over 32 ms is
+                    // 112 * sin(PI * (13 * 0.032) / 6), rounded up.
+                    assert!(u8::abs_diff(*current, *previous) <= 25);
                 }
                 previous = brightness;
             }
             let midpoint = summary_shimmer(
                 "Working",
-                Duration::from_secs(/*secs*/ 1),
+                Duration::from_millis(/*millis*/ 1100),
                 MotionMode::Animated,
             );
             let expected = "Working"