diff --git a/scripts/codex-fleet/lib/ios-nav-strip.sh b/scripts/codex-fleet/lib/ios-nav-strip.sh
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+++ b/scripts/codex-fleet/lib/ios-nav-strip.sh
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+#!/usr/bin/env bash
+# ios-nav-strip — apply an iOS-style window navigation strip to the TOP of a
+# given codex-fleet tmux session. Each tmux window renders as a chip; the
+# active window is highlighted in iOS blue, inactive windows in iOS gray.
+#
+# Palette (iOS systemColors):
+#   #007AFF  iOS blue       — active window accent dot
+#   #FFFFFF  white          — active window label
+#   #8E8E93  iOS gray       — inactive window label / right-side tag
+#   #3A3A3C  separator gray — pipe glyph between chips
+#
+# Sister to scripts/codex-fleet/style-tabs.sh. That script handles the broader
+# tab chrome (pills, half-circle caps, multi-row padding); this one is scoped
+# narrowly to the TOP nav strip and uses pure tmux options — no extra
+# processes spawned, no formatters, no daemons. Re-run is idempotent.
+#
+# Undo (per-option):
+#   tmux -L <session> set-option  -gu status-position
+#   tmux -L <session> set-option  -gu status
+#   tmux -L <session> set-option  -gu status-justify
+#   tmux -L <session> set-option  -gu status-style
+#   tmux -L <session> set-option  -gu status-left
+#   tmux -L <session> set-option  -gu status-right
+#   tmux -L <session> set-option  -gu status-interval
+#   tmux -L <session> set-window-option -gu window-status-format
+#   tmux -L <session> set-window-option -gu window-status-current-format
+#   tmux -L <session> set-window-option -gu window-status-separator
+#
+# Usage:
+#   bash scripts/codex-fleet/lib/ios-nav-strip.sh <session-name>
+
+set -euo pipefail
+
+SESSION="${1:-}"
+
+if [[ -z "$SESSION" ]]; then
+  echo "usage: bash scripts/codex-fleet/lib/ios-nav-strip.sh <session-name>" >&2
+  exit 1
+fi
+
+# Project convention: socket name == session name for codex-fleet sessions.
+if ! tmux -L "$SESSION" has-session -t "$SESSION" 2>/dev/null; then
+  echo "[ios-nav-strip] session '$SESSION' not running on socket -L $SESSION; skipping (idempotent)."
+  exit 0
+fi
+
+# iOS palette tokens (kept inline so the chrome reads as one continuous surface
+# with fleet-tick.sh / style-tabs.sh).
+IOS_BLUE="#007AFF"
+IOS_WHITE="#FFFFFF"
+IOS_GRAY="#8E8E93"
+IOS_SEP="#3A3A3C"
+
+# Inactive chip: gray label + a trailing separator pipe. Separator color is the
+# darker iOS gray so it reads as a divider, not as text.
+INACTIVE_FMT="#[fg=${IOS_GRAY},nobold] #I #W #[fg=${IOS_SEP}]|#[default]"
+# Active chip: leading iOS-blue dot + bold white label.
+ACTIVE_FMT="#[fg=${IOS_BLUE},bold]●#[fg=${IOS_WHITE},bold] #I #W #[default]"
+
+# Apply tmux options. Each set-option / set-window-option is idempotent — tmux
+# silently overwrites the previous value.
+tmux -L "$SESSION" set-option        -g  status-position    top
+tmux -L "$SESSION" set-option        -g  status             on
+tmux -L "$SESSION" set-option        -g  status-justify     left
+# bg=default keeps the strip transparent so it matches the glass chrome the
+# rest of the project paints with fleet-tick.sh + style-tabs.sh.
+tmux -L "$SESSION" set-option        -g  status-style       "fg=${IOS_WHITE},bg=default"
+tmux -L "$SESSION" set-option        -g  status-left        ""
+tmux -L "$SESSION" set-option        -g  status-right       "#[fg=${IOS_GRAY}] codex-fleet "
+tmux -L "$SESSION" set-option        -g  status-interval    2
+
+tmux -L "$SESSION" set-window-option -g  window-status-format         "$INACTIVE_FMT"
+tmux -L "$SESSION" set-window-option -g  window-status-current-format "$ACTIVE_FMT"
+# Separator is inlined inside window-status-format so adjacent chips don't get
+# a double divider.
+tmux -L "$SESSION" set-window-option -g  window-status-separator      ""
+
+# Verify by reading back status-position. Operators can grep this line in logs.
+position="$(tmux -L "$SESSION" show-option -gv status-position 2>/dev/null || true)"
+echo "[ios-nav-strip] session=${SESSION} status-position=${position:-<unset>}"