docs(tui): clarify terminal title behavior

codex-rs/core/config.schema.json

@@ -1422,6 +1422,14 @@
           },
           "type": "array"
         },
+        "terminal_title": {
+          "default": null,
+          "description": "Ordered list of terminal title item identifiers.\n\nWhen set, the TUI renders the selected items into the terminal window/tab title. When unset, the TUI defaults to: `project` and `status`.",
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
         "theme": {
           "default": null,
           "description": "Syntax highlighting theme name (kebab-case).\n\nWhen set, overrides automatic light/dark theme detection. Use `/theme` in the TUI or see `$CODEX_HOME/themes` for custom themes.",

codex-rs/core/src/config/edit.rs

@@ -55,7 +55,7 @@ pub enum ConfigEdit {
     ClearPath { segments: Vec<String> },
 }
 
-/// Produces a config edit that sets `[tui] theme = "<name>"`.
+/// Produces a config edit that sets `[tui].theme = "<name>"`.
 pub fn syntax_theme_edit(name: &str) -> ConfigEdit {
     ConfigEdit::SetPath {
         segments: vec!["tui".to_string(), "theme".to_string()],
@@ -63,6 +63,10 @@ pub fn syntax_theme_edit(name: &str) -> ConfigEdit {
     }
 }
 
+/// Produces a config edit that sets `[tui].status_line` to an explicit ordered list.
+///
+/// The array is written even when it is empty so "hide the status line" stays
+/// distinct from "unset, so use defaults".
 pub fn status_line_items_edit(items: &[String]) -> ConfigEdit {
     let mut array = toml_edit::Array::new();
     for item in items {
@@ -75,6 +79,22 @@ pub fn status_line_items_edit(items: &[String]) -> ConfigEdit {
     }
 }
 
+/// Produces a config edit that sets `[tui].terminal_title` to an explicit ordered list.
+///
+/// The array is written even when it is empty so "disabled title updates" stays
+/// distinct from "unset, so use defaults".
+pub fn terminal_title_items_edit(items: &[String]) -> ConfigEdit {
+    let mut array = toml_edit::Array::new();
+    for item in items {
+        array.push(item.clone());
+    }
+
+    ConfigEdit::SetPath {
+        segments: vec!["tui".to_string(), "terminal_title".to_string()],
+        value: TomlItem::Value(array.into()),
+    }
+}
+
 // TODO(jif) move to a dedicated file
 mod document_helpers {
     use crate::config::types::McpServerConfig;

codex-rs/core/src/config/mod.rs

@@ -295,6 +295,11 @@ pub struct Config {
     /// `current-dir`.
     pub tui_status_line: Option<Vec<String>>,
 
+    /// Ordered list of terminal title item identifiers for the TUI.
+    ///
+    /// When unset, the TUI defaults to: `project` and `status`.
+    pub tui_terminal_title: Option<Vec<String>>,
+
     /// Syntax highlighting theme override (kebab-case name).
     pub tui_theme: Option<String>,
 
@@ -2198,6 +2203,7 @@ impl Config {
                 .unwrap_or_default(),
             tui_status_line: cfg.tui.as_ref().and_then(|t| t.status_line.clone()),
             tui_theme: cfg.tui.as_ref().and_then(|t| t.theme.clone()),
+            tui_terminal_title: cfg.tui.as_ref().and_then(|t| t.terminal_title.clone()),
             otel: {
                 let t: OtelConfigToml = cfg.otel.unwrap_or_default();
                 let log_user_prompt = t.log_user_prompt.unwrap_or(false);
@@ -2639,6 +2645,7 @@ theme = "dracula"
                 show_tooltips: true,
                 alternate_screen: AltScreenMode::Auto,
                 status_line: None,
+                terminal_title: None,
                 theme: None,
             }
         );
@@ -4796,6 +4803,7 @@ model_verbosity = "high"
                 feedback_enabled: true,
                 tui_alternate_screen: AltScreenMode::Auto,
                 tui_status_line: None,
+                tui_terminal_title: None,
                 tui_theme: None,
                 otel: OtelConfig::default(),
             },
@@ -4922,6 +4930,7 @@ model_verbosity = "high"
             feedback_enabled: true,
             tui_alternate_screen: AltScreenMode::Auto,
             tui_status_line: None,
+            tui_terminal_title: None,
             tui_theme: None,
             otel: OtelConfig::default(),
         };
@@ -5046,6 +5055,7 @@ model_verbosity = "high"
             feedback_enabled: true,
             tui_alternate_screen: AltScreenMode::Auto,
             tui_status_line: None,
+            tui_terminal_title: None,
             tui_theme: None,
             otel: OtelConfig::default(),
         };
@@ -5156,6 +5166,7 @@ model_verbosity = "high"
             feedback_enabled: true,
             tui_alternate_screen: AltScreenMode::Auto,
             tui_status_line: None,
+            tui_terminal_title: None,
             tui_theme: None,
             otel: OtelConfig::default(),
         };

codex-rs/core/src/config/types.rs

@@ -682,6 +682,13 @@ pub struct Tui {
     #[serde(default)]
     pub status_line: Option<Vec<String>>,
 
+    /// Ordered list of terminal title item identifiers.
+    ///
+    /// When set, the TUI renders the selected items into the terminal window/tab title.
+    /// When unset, the TUI defaults to: `project` and `status`.
+    #[serde(default)]
+    pub terminal_title: Option<Vec<String>>,
+
     /// Syntax highlighting theme name (kebab-case).
     ///
     /// When set, overrides automatic light/dark theme detection.

codex-rs/tui/src/app.rs

@@ -583,6 +583,8 @@ pub(crate) struct App {
     pub(crate) commit_anim_running: Arc<AtomicBool>,
     // Shared across ChatWidget instances so invalid status-line config warnings only emit once.
     status_line_invalid_items_warned: Arc<AtomicBool>,
+    // Shared across ChatWidget instances so invalid terminal-title config warnings only emit once.
+    terminal_title_invalid_items_warned: Arc<AtomicBool>,
 
     // Esc-backtracking state grouped
     pub(crate) backtrack: crate::app_backtrack::BacktrackState,
@@ -667,6 +669,7 @@ impl App {
             feedback_audience: self.feedback_audience,
             model: Some(self.chat_widget.current_model().to_string()),
             status_line_invalid_items_warned: self.status_line_invalid_items_warned.clone(),
+            terminal_title_invalid_items_warned: self.terminal_title_invalid_items_warned.clone(),
             otel_manager: self.otel_manager.clone(),
         }
     }
@@ -1193,6 +1196,7 @@ impl App {
             feedback_audience: self.feedback_audience,
             model: Some(model),
             status_line_invalid_items_warned: self.status_line_invalid_items_warned.clone(),
+            terminal_title_invalid_items_warned: self.terminal_title_invalid_items_warned.clone(),
             otel_manager: self.otel_manager.clone(),
         };
         self.chat_widget = ChatWidget::new(init, self.server.clone());
@@ -1267,7 +1271,7 @@ impl App {
         for event in snapshot.events {
             self.handle_codex_event_replay(event);
         }
-        self.refresh_status_line();
+        self.refresh_status_surfaces();
     }
 
     fn should_wait_for_initial_session(session_selection: &SessionSelection) -> bool {
@@ -1380,6 +1384,7 @@ impl App {
         }
 
         let status_line_invalid_items_warned = Arc::new(AtomicBool::new(false));
+        let terminal_title_invalid_items_warned = Arc::new(AtomicBool::new(false));
 
         let enhanced_keys_supported = tui.enhanced_keys_supported();
         let wait_for_initial_session_configured =
@@ -1404,6 +1409,8 @@ impl App {
                     feedback_audience,
                     model: Some(model.clone()),
                     status_line_invalid_items_warned: status_line_invalid_items_warned.clone(),
+                    terminal_title_invalid_items_warned: terminal_title_invalid_items_warned
+                        .clone(),
                     otel_manager: otel_manager.clone(),
                 };
                 ChatWidget::new(init, thread_manager.clone())
@@ -1434,6 +1441,8 @@ impl App {
                     feedback_audience,
                     model: config.model.clone(),
                     status_line_invalid_items_warned: status_line_invalid_items_warned.clone(),
+                    terminal_title_invalid_items_warned: terminal_title_invalid_items_warned
+                        .clone(),
                     otel_manager: otel_manager.clone(),
                 };
                 ChatWidget::new_from_existing(init, resumed.thread, resumed.session_configured)
@@ -1465,6 +1474,8 @@ impl App {
                     feedback_audience,
                     model: config.model.clone(),
                     status_line_invalid_items_warned: status_line_invalid_items_warned.clone(),
+                    terminal_title_invalid_items_warned: terminal_title_invalid_items_warned
+                        .clone(),
                     otel_manager: otel_manager.clone(),
                 };
                 ChatWidget::new_from_existing(init, forked.thread, forked.session_configured)
@@ -1498,6 +1509,7 @@ impl App {
             has_emitted_history_lines: false,
             commit_anim_running: Arc::new(AtomicBool::new(false)),
             status_line_invalid_items_warned: status_line_invalid_items_warned.clone(),
+            terminal_title_invalid_items_warned: terminal_title_invalid_items_warned.clone(),
             backtrack: BacktrackState::default(),
             backtrack_render_pending: false,
             feedback: feedback.clone(),
@@ -1641,7 +1653,7 @@ impl App {
         if matches!(event, TuiEvent::Draw) {
             let size = tui.terminal.size()?;
             if size != tui.terminal.last_known_screen_size {
-                self.refresh_status_line();
+                self.refresh_status_surfaces();
             }
         }
 
@@ -2000,15 +2012,15 @@ impl App {
             }
             AppEvent::UpdateReasoningEffort(effort) => {
                 self.on_update_reasoning_effort(effort);
-                self.refresh_status_line();
+                self.refresh_status_surfaces();
             }
             AppEvent::UpdateModel(model) => {
                 self.chat_widget.set_model(&model);
-                self.refresh_status_line();
+                self.refresh_status_surfaces();
             }
             AppEvent::UpdateCollaborationMode(mask) => {
                 self.chat_widget.set_collaboration_mask(mask);
-                self.refresh_status_line();
+                self.refresh_status_surfaces();
             }
             AppEvent::UpdatePersonality(personality) => {
                 self.on_update_personality(personality);
@@ -2578,7 +2590,7 @@ impl App {
             AppEvent::UpdatePlanModeReasoningEffort(effort) => {
                 self.config.plan_mode_reasoning_effort = effort;
                 self.chat_widget.set_plan_mode_reasoning_effort(effort);
-                self.refresh_status_line();
+                self.refresh_status_surfaces();
             }
             AppEvent::PersistFullAccessWarningAcknowledged => {
                 if let Err(err) = ConfigEditsBuilder::new(&self.config.codex_home)
@@ -2871,11 +2883,38 @@ impl App {
             }
             AppEvent::StatusLineBranchUpdated { cwd, branch } => {
                 self.chat_widget.set_status_line_branch(cwd, branch);
-                self.refresh_status_line();
+                self.refresh_status_surfaces();
             }
             AppEvent::StatusLineSetupCancelled => {
                 self.chat_widget.cancel_status_line_setup();
             }
+            AppEvent::TerminalTitleSetup { items } => {
+                let ids = items.iter().map(ToString::to_string).collect::<Vec<_>>();
+                let edit = codex_core::config::edit::terminal_title_items_edit(&ids);
+                let apply_result = ConfigEditsBuilder::new(&self.config.codex_home)
+                    .with_edits([edit])
+                    .apply()
+                    .await;
+                match apply_result {
+                    Ok(()) => {
+                        self.config.tui_terminal_title = Some(ids.clone());
+                        self.chat_widget.setup_terminal_title(items);
+                    }
+                    Err(err) => {
+                        tracing::error!(error = %err, "failed to persist terminal title items; keeping previous selection");
+                        self.chat_widget.revert_terminal_title_setup_preview();
+                        self.chat_widget.add_error_message(format!(
+                            "Failed to save terminal title items: {err}"
+                        ));
+                    }
+                }
+            }
+            AppEvent::TerminalTitleSetupPreview { items } => {
+                self.chat_widget.preview_terminal_title(items);
+            }
+            AppEvent::TerminalTitleSetupCancelled => {
+                self.chat_widget.cancel_terminal_title_setup();
+            }
             AppEvent::SyntaxThemeSelected { name } => {
                 let edit = codex_core::config::edit::syntax_theme_edit(&name);
                 let apply_result = ConfigEditsBuilder::new(&self.config.codex_home)
@@ -2929,7 +2968,7 @@ impl App {
         self.chat_widget.handle_codex_event(event);
 
         if needs_refresh {
-            self.refresh_status_line();
+            self.refresh_status_surfaces();
         }
     }
 
@@ -3283,8 +3322,8 @@ impl App {
         };
     }
 
-    fn refresh_status_line(&mut self) {
-        self.chat_widget.refresh_status_line();
+    fn refresh_status_surfaces(&mut self) {
+        self.chat_widget.refresh_status_surfaces();
     }
 
     #[cfg(target_os = "windows")]
@@ -3860,6 +3899,7 @@ mod tests {
             enhanced_keys_supported: false,
             commit_anim_running: Arc::new(AtomicBool::new(false)),
             status_line_invalid_items_warned: Arc::new(AtomicBool::new(false)),
+            terminal_title_invalid_items_warned: Arc::new(AtomicBool::new(false)),
             backtrack: BacktrackState::default(),
             backtrack_render_pending: false,
             feedback: codex_feedback::CodexFeedback::new(),
@@ -3919,6 +3959,7 @@ mod tests {
                 enhanced_keys_supported: false,
                 commit_anim_running: Arc::new(AtomicBool::new(false)),
                 status_line_invalid_items_warned: Arc::new(AtomicBool::new(false)),
+                terminal_title_invalid_items_warned: Arc::new(AtomicBool::new(false)),
                 backtrack: BacktrackState::default(),
                 backtrack_render_pending: false,
                 feedback: codex_feedback::CodexFeedback::new(),

codex-rs/tui/src/app_event.rs

@@ -20,6 +20,7 @@ use codex_utils_approval_presets::ApprovalPreset;
 
 use crate::bottom_pane::ApprovalRequest;
 use crate::bottom_pane::StatusLineItem;
+use crate::bottom_pane::TerminalTitleItem;
 use crate::history_cell::HistoryCell;
 
 use codex_core::features::Feature;
@@ -390,6 +391,16 @@ pub(crate) enum AppEvent {
     },
     /// Dismiss the status-line setup UI without changing config.
     StatusLineSetupCancelled,
+    /// Apply a user-confirmed terminal-title item ordering/selection.
+    TerminalTitleSetup {
+        items: Vec<TerminalTitleItem>,
+    },
+    /// Apply a temporary terminal-title preview while the setup UI is open.
+    TerminalTitleSetupPreview {
+        items: Vec<TerminalTitleItem>,
+    },
+    /// Dismiss the terminal-title setup UI without changing config.
+    TerminalTitleSetupCancelled,
 
     /// Apply a user-confirmed syntax theme selection.
     SyntaxThemeSelected {

codex-rs/tui/src/bottom_pane/mod.rs

@@ -45,6 +45,7 @@ mod approval_overlay;
 mod multi_select_picker;
 mod request_user_input;
 mod status_line_setup;
+mod title_setup;
 pub(crate) use app_link_view::AppLinkView;
 pub(crate) use app_link_view::AppLinkViewParams;
 pub(crate) use approval_overlay::ApprovalOverlay;
@@ -92,6 +93,8 @@ pub(crate) use skills_toggle_view::SkillsToggleItem;
 pub(crate) use skills_toggle_view::SkillsToggleView;
 pub(crate) use status_line_setup::StatusLineItem;
 pub(crate) use status_line_setup::StatusLineSetupView;
+pub(crate) use title_setup::TerminalTitleItem;
+pub(crate) use title_setup::TerminalTitleSetupView;
 mod paste_burst;
 mod pending_thread_approvals;
 pub mod popup_consts;

codex-rs/tui/src/bottom_pane/snapshots/codex_tui__bottom_pane__title_setup__tests__terminal_title_setup_basic.snap

@@ -0,0 +1,19 @@
+---
+source: tui/src/bottom_pane/title_setup.rs
+expression: "render_lines(&view, 84)"
+---
+                                                                                    
+  Configure Terminal Title                                                          
+  Select which items to display in the terminal title.                              
+                                                                                    
+  Type to search                                                                    
+  >                                                                                 
+› [x] project        Project name (falls back to current directory name)            
+  [x] status         Compact session status (Ready, Working, Thinking, ...)         
+  [x] thread         Current thread title (omitted until available)                 
+  [ ] git-branch     Current Git branch (omitted when unavailable)                  
+  [ ] model          Current model name                                             
+  [ ] task-progress  Latest task progress from update_plan (omitted until availab…  
+                                                                                    
+  my-project | Working... | Investigate flaky test                                  
+  Use ↑↓ to navigate, ←→ to move, space to select, enter to confirm, esc to cancel.

codex-rs/tui/src/bottom_pane/title_setup.rs

@@ -0,0 +1,273 @@
+//! Terminal title configuration view for customizing the terminal window/tab title.
+//!
+//! This module provides an interactive picker for selecting which items appear
+//! in the terminal title. Users can:
+//!
+//! - Select items
+//! - Reorder items
+//! - Preview the rendered title
+
+use std::collections::HashSet;
+
+use ratatui::buffer::Buffer;
+use ratatui::layout::Rect;
+use ratatui::text::Line;
+use strum::IntoEnumIterator;
+use strum_macros::Display;
+use strum_macros::EnumIter;
+use strum_macros::EnumString;
+
+use crate::app_event::AppEvent;
+use crate::app_event_sender::AppEventSender;
+use crate::bottom_pane::CancellationEvent;
+use crate::bottom_pane::bottom_pane_view::BottomPaneView;
+use crate::bottom_pane::multi_select_picker::MultiSelectItem;
+use crate::bottom_pane::multi_select_picker::MultiSelectPicker;
+use crate::render::renderable::Renderable;
+
+/// Available items that can be displayed in the terminal title.
+#[derive(EnumIter, EnumString, Display, Debug, Clone, Eq, PartialEq)]
+#[strum(serialize_all = "kebab_case")]
+pub(crate) enum TerminalTitleItem {
+    /// Project root name, or a compact cwd fallback.
+    Project,
+    /// Compact runtime status (Ready, Working, Thinking, ...).
+    Status,
+    /// Current thread title (if available).
+    Thread,
+    /// Current git branch (if available).
+    GitBranch,
+    /// Current model name.
+    Model,
+    /// Latest checklist task progress from `update_plan` (if available).
+    #[strum(to_string = "task-progress")]
+    TaskProgress,
+}
+
+impl TerminalTitleItem {
+    pub(crate) fn description(&self) -> &'static str {
+        match self {
+            TerminalTitleItem::Project => "Project name (falls back to current directory name)",
+            TerminalTitleItem::Status => "Compact session status (Ready, Working, Thinking, ...)",
+            TerminalTitleItem::Thread => "Current thread title (omitted until available)",
+            TerminalTitleItem::GitBranch => "Current Git branch (omitted when unavailable)",
+            TerminalTitleItem::Model => "Current model name",
+            TerminalTitleItem::TaskProgress => {
+                "Latest task progress from update_plan (omitted until available)"
+            }
+        }
+    }
+
+    pub(crate) fn render(&self) -> &'static str {
+        match self {
+            TerminalTitleItem::Project => "my-project",
+            TerminalTitleItem::Status => "Working...",
+            TerminalTitleItem::Thread => "Investigate flaky test",
+            TerminalTitleItem::GitBranch => "feat/awesome-feature",
+            TerminalTitleItem::Model => "gpt-5.2-codex",
+            TerminalTitleItem::TaskProgress => "Tasks 2/5",
+        }
+    }
+}
+
+fn parse_terminal_title_items<T>(ids: impl Iterator<Item = T>) -> Option<Vec<TerminalTitleItem>>
+where
+    T: AsRef<str>,
+{
+    // Treat parsing as all-or-nothing so preview/confirm callbacks never emit
+    // a partially interpreted ordering. Invalid ids are ignored when building
+    // the picker, but once the user is interacting with the picker we only want
+    // to persist or preview a fully valid selection.
+    ids.map(|id| id.as_ref().parse::<TerminalTitleItem>())
+        .collect::<Result<Vec<_>, _>>()
+        .ok()
+}
+
+/// Interactive view for configuring terminal-title items.
+pub(crate) struct TerminalTitleSetupView {
+    picker: MultiSelectPicker,
+}
+
+impl TerminalTitleSetupView {
+    /// Creates the terminal-title picker, preserving the configured item order first.
+    ///
+    /// Unknown configured ids are skipped here instead of surfaced inline. The
+    /// main TUI still warns about them when rendering the actual title, but the
+    /// picker itself only exposes the selectable items it can meaningfully
+    /// preview and persist.
+    pub(crate) fn new(title_items: Option<&[String]>, app_event_tx: AppEventSender) -> Self {
+        let mut used_ids = HashSet::new();
+        let mut items = Vec::new();
+
+        if let Some(selected_items) = title_items.as_ref() {
+            for id in *selected_items {
+                let Ok(item) = id.parse::<TerminalTitleItem>() else {
+                    continue;
+                };
+                let item_id = item.to_string();
+                if !used_ids.insert(item_id.clone()) {
+                    continue;
+                }
+                items.push(Self::title_select_item(item, true));
+            }
+        }
+
+        for item in TerminalTitleItem::iter() {
+            let item_id = item.to_string();
+            if used_ids.contains(&item_id) {
+                continue;
+            }
+            items.push(Self::title_select_item(item, false));
+        }
+
+        Self {
+            picker: MultiSelectPicker::builder(
+                "Configure Terminal Title".to_string(),
+                Some("Select which items to display in the terminal title.".to_string()),
+                app_event_tx,
+            )
+            .instructions(vec![
+                "Use ↑↓ to navigate, ←→ to move, space to select, enter to confirm, esc to cancel."
+                    .into(),
+            ])
+            .items(items)
+            .enable_ordering()
+            .on_preview(|items| {
+                let items = parse_terminal_title_items(
+                    items
+                        .iter()
+                        .filter(|item| item.enabled)
+                        .map(|item| item.id.as_str()),
+                )?;
+                let preview = items
+                    .iter()
+                    .map(TerminalTitleItem::render)
+                    .collect::<Vec<_>>()
+                    .join(" | ");
+                if preview.is_empty() {
+                    None
+                } else {
+                    Some(Line::from(preview))
+                }
+            })
+            .on_change(|items, app_event| {
+                let Some(items) = parse_terminal_title_items(
+                    items
+                        .iter()
+                        .filter(|item| item.enabled)
+                        .map(|item| item.id.as_str()),
+                ) else {
+                    return;
+                };
+                app_event.send(AppEvent::TerminalTitleSetupPreview { items });
+            })
+            .on_confirm(|ids, app_event| {
+                let Some(items) = parse_terminal_title_items(ids.iter().map(String::as_str)) else {
+                    return;
+                };
+                app_event.send(AppEvent::TerminalTitleSetup { items });
+            })
+            .on_cancel(|app_event| {
+                app_event.send(AppEvent::TerminalTitleSetupCancelled);
+            })
+            .build(),
+        }
+    }
+
+    fn title_select_item(item: TerminalTitleItem, enabled: bool) -> MultiSelectItem {
+        MultiSelectItem {
+            id: item.to_string(),
+            name: item.to_string(),
+            description: Some(item.description().to_string()),
+            enabled,
+        }
+    }
+}
+
+impl BottomPaneView for TerminalTitleSetupView {
+    fn handle_key_event(&mut self, key_event: crossterm::event::KeyEvent) {
+        self.picker.handle_key_event(key_event);
+    }
+
+    fn is_complete(&self) -> bool {
+        self.picker.complete
+    }
+
+    fn on_ctrl_c(&mut self) -> CancellationEvent {
+        self.picker.close();
+        CancellationEvent::Handled
+    }
+}
+
+impl Renderable for TerminalTitleSetupView {
+    fn render(&self, area: Rect, buf: &mut Buffer) {
+        self.picker.render(area, buf);
+    }
+
+    fn desired_height(&self, width: u16) -> u16 {
+        self.picker.desired_height(width)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use insta::assert_snapshot;
+    use pretty_assertions::assert_eq;
+    use tokio::sync::mpsc::unbounded_channel;
+
+    fn render_lines(view: &TerminalTitleSetupView, width: u16) -> String {
+        let height = view.desired_height(width);
+        let area = Rect::new(0, 0, width, height);
+        let mut buf = Buffer::empty(area);
+        view.render(area, &mut buf);
+
+        let lines: Vec<String> = (0..area.height)
+            .map(|row| {
+                let mut line = String::new();
+                for col in 0..area.width {
+                    let symbol = buf[(area.x + col, area.y + row)].symbol();
+                    if symbol.is_empty() {
+                        line.push(' ');
+                    } else {
+                        line.push_str(symbol);
+                    }
+                }
+                line
+            })
+            .collect();
+        lines.join("\n")
+    }
+
+    #[test]
+    fn renders_title_setup_popup() {
+        let (tx_raw, _rx) = unbounded_channel::<AppEvent>();
+        let tx = AppEventSender::new(tx_raw);
+        let selected = [
+            "project".to_string(),
+            "status".to_string(),
+            "thread".to_string(),
+        ];
+        let view = TerminalTitleSetupView::new(Some(&selected), tx);
+        assert_snapshot!("terminal_title_setup_basic", render_lines(&view, 84));
+    }
+
+    #[test]
+    fn parse_terminal_title_items_preserves_order() {
+        let items = parse_terminal_title_items(["project", "status", "thread"].into_iter());
+        assert_eq!(
+            items,
+            Some(vec![
+                TerminalTitleItem::Project,
+                TerminalTitleItem::Status,
+                TerminalTitleItem::Thread,
+            ])
+        );
+    }
+
+    #[test]
+    fn parse_terminal_title_items_rejects_invalid_ids() {
+        let items = parse_terminal_title_items(["project", "not-a-title-item"].into_iter());
+        assert_eq!(items, None);
+    }
+}

codex-rs/tui/src/chatwidget.rs

@@ -39,10 +39,15 @@ use std::time::Instant;
 
 use crate::bottom_pane::StatusLineItem;
 use crate::bottom_pane::StatusLineSetupView;
+use crate::bottom_pane::TerminalTitleItem;
+use crate::bottom_pane::TerminalTitleSetupView;
 use crate::status::RateLimitWindowDisplay;
 use crate::status::format_directory_display;
 use crate::status::format_tokens_compact;
 use crate::status::rate_limit_snapshot_display_for_limit;
+use crate::terminal_title::SetTerminalTitleResult;
+use crate::terminal_title::clear_terminal_title;
+use crate::terminal_title::set_terminal_title;
 use crate::text_formatting::proper_join;
 use crate::version::CODEX_CLI_VERSION;
 use codex_app_server_protocol::ConfigLayerSource;
@@ -153,6 +158,7 @@ use tokio::sync::mpsc::UnboundedSender;
 use tokio::task::JoinHandle;
 use tracing::debug;
 use tracing::warn;
+use unicode_segmentation::UnicodeSegmentation;
 
 const DEFAULT_MODEL_DISPLAY_NAME: &str = "loading";
 const PLAN_IMPLEMENTATION_TITLE: &str = "Implement this plan?";
@@ -279,6 +285,7 @@ use codex_file_search::FileMatch;
 use codex_protocol::openai_models::InputModality;
 use codex_protocol::openai_models::ModelPreset;
 use codex_protocol::openai_models::ReasoningEffort as ReasoningEffortConfig;
+use codex_protocol::plan_tool::StepStatus;
 use codex_protocol::plan_tool::UpdatePlanArgs;
 use codex_protocol::protocol::AskForApproval;
 use codex_protocol::protocol::SandboxPolicy;
@@ -291,6 +298,7 @@ const USER_SHELL_COMMAND_HELP_HINT: &str = "Example: !ls";
 const DEFAULT_OPENAI_BASE_URL: &str = "https://api.openai.com/v1";
 const DEFAULT_STATUS_LINE_ITEMS: [&str; 3] =
     ["model-with-reasoning", "context-remaining", "current-dir"];
+const DEFAULT_TERMINAL_TITLE_ITEMS: [&str; 2] = ["project", "status"];
 // Track information about an in-flight exec command.
 struct RunningCommand {
     command: Vec<String>,
@@ -461,6 +469,8 @@ pub(crate) struct ChatWidgetInit {
     pub(crate) model: Option<String>,
     // Shared latch so we only warn once about invalid status-line item IDs.
     pub(crate) status_line_invalid_items_warned: Arc<AtomicBool>,
+    // Shared latch so we only warn once about invalid terminal-title item IDs.
+    pub(crate) terminal_title_invalid_items_warned: Arc<AtomicBool>,
     pub(crate) otel_manager: OtelManager,
 }
 
@@ -590,6 +600,8 @@ pub(crate) struct ChatWidget {
     full_reasoning_buffer: String,
     // Current status header shown in the status indicator.
     current_status_header: String,
+    // Semantic status used for terminal-title status rendering (avoid string matching on headers).
+    terminal_title_status_kind: TerminalTitleStatusKind,
     // Previous status header to restore after a transient stream retry.
     retry_status_header: Option<String>,
     // Set when commentary output completes; once stream queues go idle we restore the status row.
@@ -639,6 +651,8 @@ pub(crate) struct ChatWidget {
     saw_plan_update_this_turn: bool,
     // Whether the current turn emitted a proposed plan item.
     saw_plan_item_this_turn: bool,
+    // Latest `update_plan` checklist task counts for terminal-title rendering.
+    last_plan_progress: Option<(usize, usize)>,
     // Incremental buffer for streamed plan content.
     plan_delta_buffer: String,
     // True while a plan item is streaming.
@@ -662,6 +676,16 @@ pub(crate) struct ChatWidget {
     session_network_proxy: Option<codex_protocol::protocol::SessionNetworkProxyRuntime>,
     // Shared latch so we only warn once about invalid status-line item IDs.
     status_line_invalid_items_warned: Arc<AtomicBool>,
+    // Shared latch so we only warn once about invalid terminal-title item IDs.
+    terminal_title_invalid_items_warned: Arc<AtomicBool>,
+    // Last terminal title emitted, to avoid writing duplicate OSC updates.
+    last_terminal_title: Option<String>,
+    // Original terminal-title config captured when opening the setup UI so live preview can be
+    // rolled back on cancel.
+    terminal_title_setup_original_items: Option<Option<Vec<String>>>,
+    // Cached project root display name for the current cwd; avoids walking parent directories on
+    // frequent title/status refreshes.
+    status_line_project_root_name_cache: Option<CachedProjectRootName>,
     // Cached git branch name for the status line (None if unknown).
     status_line_branch: Option<String>,
     // CWD used to resolve the cached branch; change resets branch state.
@@ -849,6 +873,54 @@ enum ReplayKind {
     ThreadSnapshot,
 }
 
+#[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
+/// Compact runtime states that can be rendered into the terminal title.
+///
+/// This is intentionally smaller than the full status-header vocabulary. The
+/// title needs short, stable labels, so callers map richer lifecycle events
+/// onto one of these buckets before rendering.
+enum TerminalTitleStatusKind {
+    Working,
+    WaitingForBackgroundTerminal,
+    Undoing,
+    #[default]
+    Thinking,
+}
+
+#[derive(Debug)]
+/// Parsed status-surface configuration for one refresh pass.
+///
+/// The status line and terminal title share some expensive or stateful inputs
+/// (notably git branch lookup and invalid-item warnings). This snapshot lets one
+/// refresh pass compute those shared concerns once, then render both surfaces
+/// from the same selection set.
+struct StatusSurfaceSelections {
+    status_line_items: Vec<StatusLineItem>,
+    invalid_status_line_items: Vec<String>,
+    terminal_title_items: Vec<TerminalTitleItem>,
+    invalid_terminal_title_items: Vec<String>,
+}
+
+impl StatusSurfaceSelections {
+    fn uses_git_branch(&self) -> bool {
+        self.status_line_items.contains(&StatusLineItem::GitBranch)
+            || self
+                .terminal_title_items
+                .contains(&TerminalTitleItem::GitBranch)
+    }
+}
+
+#[derive(Clone, Debug)]
+/// Cached project-root display name keyed by the cwd used for the last lookup.
+///
+/// Terminal-title refreshes can happen very frequently, so the title path avoids
+/// repeatedly walking up the filesystem to rediscover the same project root name
+/// while the working directory is unchanged.
+struct CachedProjectRootName {
+    cwd: PathBuf,
+    root_name: Option<String>,
+}
+
 impl ChatWidget {
     fn realtime_conversation_enabled(&self) -> bool {
         self.config.features.enabled(Feature::RealtimeConversation)
@@ -862,12 +934,15 @@ impl ChatWidget {
     fn update_task_running_state(&mut self) {
         self.bottom_pane
             .set_task_running(self.agent_turn_running || self.mcp_startup_status.is_some());
+        self.refresh_terminal_title();
     }
 
     fn restore_reasoning_status_header(&mut self) {
         if let Some(header) = extract_first_bold(&self.reasoning_buffer) {
+            self.terminal_title_status_kind = TerminalTitleStatusKind::Thinking;
             self.set_status_header(header);
         } else if self.bottom_pane.is_task_running() {
+            self.terminal_title_status_kind = TerminalTitleStatusKind::Working;
             self.set_status_header(String::from("Working"));
         }
     }
@@ -936,6 +1011,14 @@ impl ChatWidget {
         self.current_status_header = header.clone();
         self.bottom_pane
             .update_status(header, details, details_capitalization, details_max_lines);
+        if self
+            .config
+            .tui_terminal_title
+            .as_ref()
+            .is_some_and(|items| items.iter().any(|item| item == "status"))
+        {
+            self.refresh_terminal_title();
+        }
     }
 
     /// Convenience wrapper around [`Self::set_status`];
@@ -954,58 +1037,100 @@ impl ChatWidget {
         self.bottom_pane.set_status_line(status_line);
     }
 
-    /// Recomputes footer status-line content from config and current runtime state.
+    /// Recomputes status-line and terminal-title content from config and current runtime state.
     ///
-    /// This method is the status-line orchestrator: it parses configured item identifiers,
-    /// warns once per session about invalid items, updates whether status-line mode is enabled,
-    /// schedules async git-branch lookup when needed, and renders only values that are currently
-    /// available.
+    /// This method is the shared status-surface orchestrator: it parses configured item
+    /// identifiers, warns once per session about invalid items, updates whether status-line mode is
+    /// enabled, schedules async git-branch lookup when needed, and renders only values that are
+    /// currently available.
     ///
     /// The omission behavior is intentional. If selected items are unavailable (for example before
     /// a session id exists or before branch lookup completes), those items are skipped without
     /// placeholders so the line remains compact and stable.
-    pub(crate) fn refresh_status_line(&mut self) {
-        let (items, invalid_items) = self.status_line_items_with_invalids();
-        if self.thread_id.is_some()
-            && !invalid_items.is_empty()
-            && self
+    fn status_surface_selections(&self) -> StatusSurfaceSelections {
+        let (status_line_items, invalid_status_line_items) = self.status_line_items_with_invalids();
+        let (terminal_title_items, invalid_terminal_title_items) =
+            self.terminal_title_items_with_invalids();
+        StatusSurfaceSelections {
+            status_line_items,
+            invalid_status_line_items,
+            terminal_title_items,
+            invalid_terminal_title_items,
+        }
+    }
+
+    fn warn_invalid_status_line_items_once(&mut self, invalid_items: &[String]) {
+        if self.thread_id.is_none()
+            || invalid_items.is_empty()
+            || self
                 .status_line_invalid_items_warned
                 .compare_exchange(false, true, Ordering::Relaxed, Ordering::Relaxed)
-                .is_ok()
+                .is_err()
         {
-            let label = if invalid_items.len() == 1 {
-                "item"
-            } else {
-                "items"
-            };
-            let message = format!(
-                "Ignored invalid status line {label}: {}.",
-                proper_join(invalid_items.as_slice())
-            );
-            self.on_warning(message);
+            return;
         }
-        if !items.contains(&StatusLineItem::GitBranch) {
+
+        let label = if invalid_items.len() == 1 {
+            "item"
+        } else {
+            "items"
+        };
+        let message = format!(
+            "Ignored invalid status line {label}: {}.",
+            proper_join(invalid_items)
+        );
+        self.on_warning(message);
+    }
+
+    fn warn_invalid_terminal_title_items_once(&mut self, invalid_items: &[String]) {
+        if self.thread_id.is_none()
+            || invalid_items.is_empty()
+            || self
+                .terminal_title_invalid_items_warned
+                .compare_exchange(false, true, Ordering::Relaxed, Ordering::Relaxed)
+                .is_err()
+        {
+            return;
+        }
+
+        let label = if invalid_items.len() == 1 {
+            "item"
+        } else {
+            "items"
+        };
+        let message = format!(
+            "Ignored invalid terminal title {label}: {}.",
+            proper_join(invalid_items)
+        );
+        self.on_warning(message);
+    }
+
+    fn sync_status_surface_shared_state(&mut self, selections: &StatusSurfaceSelections) {
+        if !selections.uses_git_branch() {
             self.status_line_branch = None;
             self.status_line_branch_pending = false;
             self.status_line_branch_lookup_complete = false;
+            return;
         }
-        let enabled = !items.is_empty();
+
+        let cwd = self.status_line_cwd().to_path_buf();
+        self.sync_status_line_branch_state(&cwd);
+        if !self.status_line_branch_lookup_complete {
+            self.request_status_line_branch(cwd);
+        }
+    }
+
+    fn refresh_status_line_from_selections(&mut self, selections: &StatusSurfaceSelections) {
+        let enabled = !selections.status_line_items.is_empty();
         self.bottom_pane.set_status_line_enabled(enabled);
         if !enabled {
             self.set_status_line(None);
             return;
         }
 
-        let cwd = self.status_line_cwd().to_path_buf();
-        self.sync_status_line_branch_state(&cwd);
-
-        if items.contains(&StatusLineItem::GitBranch) && !self.status_line_branch_lookup_complete {
-            self.request_status_line_branch(cwd);
-        }
-
         let mut parts = Vec::new();
-        for item in items {
-            if let Some(value) = self.status_line_value_for_item(&item) {
+        for item in &selections.status_line_items {
+            if let Some(value) = self.status_line_value_for_item(item) {
                 parts.push(value);
             }
         }
@@ -1018,6 +1143,70 @@ impl ChatWidget {
         self.set_status_line(line);
     }
 
+    fn clear_managed_terminal_title(&mut self) -> std::io::Result<()> {
+        if self.last_terminal_title.is_some() {
+            clear_terminal_title()?;
+            self.last_terminal_title = None;
+        }
+
+        Ok(())
+    }
+
+    fn refresh_terminal_title_from_selections(&mut self, selections: &StatusSurfaceSelections) {
+        if selections.terminal_title_items.is_empty() {
+            if let Err(err) = self.clear_managed_terminal_title() {
+                tracing::debug!(error = %err, "failed to clear terminal title");
+            }
+            return;
+        }
+
+        let title = selections
+            .terminal_title_items
+            .iter()
+            .filter_map(|item| self.terminal_title_value_for_item(item))
+            .collect::<Vec<_>>()
+            .join(" | ");
+        let title = (!title.is_empty()).then_some(title);
+        if self.last_terminal_title == title {
+            return;
+        }
+        match title {
+            Some(title) => match set_terminal_title(&title) {
+                Ok(SetTerminalTitleResult::Applied) => {
+                    self.last_terminal_title = Some(title);
+                }
+                Ok(SetTerminalTitleResult::NoVisibleContent) => {
+                    if let Err(err) = self.clear_managed_terminal_title() {
+                        tracing::debug!(error = %err, "failed to clear terminal title");
+                    }
+                }
+                Err(err) => {
+                    tracing::debug!(error = %err, "failed to set terminal title");
+                }
+            },
+            None => {
+                if let Err(err) = self.clear_managed_terminal_title() {
+                    tracing::debug!(error = %err, "failed to clear terminal title");
+                }
+            }
+        }
+    }
+
+    /// Recomputes both status surfaces from one shared config snapshot.
+    ///
+    /// This is the common refresh entrypoint for the footer status line and the
+    /// terminal title. It parses both configurations once, emits invalid-item
+    /// warnings once, synchronizes shared cached state (such as git-branch
+    /// lookup), then renders each surface from that shared snapshot.
+    pub(crate) fn refresh_status_surfaces(&mut self) {
+        let selections = self.status_surface_selections();
+        self.warn_invalid_status_line_items_once(&selections.invalid_status_line_items);
+        self.warn_invalid_terminal_title_items_once(&selections.invalid_terminal_title_items);
+        self.sync_status_surface_shared_state(&selections);
+        self.refresh_status_line_from_selections(&selections);
+        self.refresh_terminal_title_from_selections(&selections);
+    }
+
     /// Records that status-line setup was canceled.
     ///
     /// Cancellation is intentionally side-effect free for config state; the existing configuration
@@ -1033,7 +1222,53 @@ impl ChatWidget {
         tracing::info!("status line setup confirmed with items: {items:#?}");
         let ids = items.iter().map(ToString::to_string).collect::<Vec<_>>();
         self.config.tui_status_line = Some(ids);
-        self.refresh_status_line();
+        self.refresh_status_surfaces();
+    }
+
+    /// Recomputes and emits the terminal title from config and runtime state.
+    pub(crate) fn refresh_terminal_title(&mut self) {
+        let selections = self.status_surface_selections();
+        self.warn_invalid_terminal_title_items_once(&selections.invalid_terminal_title_items);
+        self.sync_status_surface_shared_state(&selections);
+        self.refresh_terminal_title_from_selections(&selections);
+    }
+
+    /// Applies a temporary terminal-title selection while the setup UI is open.
+    pub(crate) fn preview_terminal_title(&mut self, items: Vec<TerminalTitleItem>) {
+        if self.terminal_title_setup_original_items.is_none() {
+            self.terminal_title_setup_original_items = Some(self.config.tui_terminal_title.clone());
+        }
+
+        let ids = items.iter().map(ToString::to_string).collect::<Vec<_>>();
+        self.config.tui_terminal_title = Some(ids);
+        self.refresh_terminal_title();
+    }
+
+    /// Restores the terminal title selection captured before opening the setup UI.
+    pub(crate) fn revert_terminal_title_setup_preview(&mut self) {
+        let Some(original_items) = self.terminal_title_setup_original_items.take() else {
+            return;
+        };
+
+        self.config.tui_terminal_title = original_items;
+        self.refresh_terminal_title();
+    }
+
+    /// Records that terminal-title setup was canceled and rolls back live preview changes.
+    pub(crate) fn cancel_terminal_title_setup(&mut self) {
+        tracing::info!("Terminal title setup canceled by user");
+        self.revert_terminal_title_setup_preview();
+    }
+
+    /// Applies terminal-title item selection from the setup view to in-memory config.
+    ///
+    /// An empty selection persists as an explicit empty list (disables title updates).
+    pub(crate) fn setup_terminal_title(&mut self, items: Vec<TerminalTitleItem>) {
+        tracing::info!("terminal title setup confirmed with items: {items:#?}");
+        let ids = items.iter().map(ToString::to_string).collect::<Vec<_>>();
+        self.terminal_title_setup_original_items = None;
+        self.config.tui_terminal_title = Some(ids);
+        self.refresh_terminal_title();
     }
 
     /// Stores async git-branch lookup results for the current status-line cwd.
@@ -1050,10 +1285,11 @@ impl ChatWidget {
         self.status_line_branch_lookup_complete = true;
     }
 
-    /// Forces a new git-branch lookup when `GitBranch` is part of the configured status line.
+    /// Forces a new git-branch lookup when `GitBranch` is used by the status line or terminal
+    /// title.
     fn request_status_line_branch_refresh(&mut self) {
-        let (items, _) = self.status_line_items_with_invalids();
-        if items.is_empty() || !items.contains(&StatusLineItem::GitBranch) {
+        let selections = self.status_surface_selections();
+        if !selections.uses_git_branch() {
             return;
         }
         let cwd = self.status_line_cwd().to_path_buf();
@@ -1125,6 +1361,7 @@ impl ChatWidget {
             self.config.permissions.sandbox_policy =
                 Constrained::allow_only(event.sandbox_policy.clone());
         }
+        self.status_line_project_root_name_cache = None;
         let initial_messages = event.initial_messages.clone();
         self.last_copyable_output = None;
         let forked_from_id = event.forked_from_id;
@@ -1218,6 +1455,7 @@ impl ChatWidget {
     fn on_thread_name_updated(&mut self, event: codex_protocol::protocol::ThreadNameUpdatedEvent) {
         if self.thread_id == Some(event.thread_id) {
             self.thread_name = event.thread_name;
+            self.refresh_terminal_title();
             self.request_redraw();
         }
     }
@@ -1357,6 +1595,7 @@ impl ChatWidget {
 
         if let Some(header) = extract_first_bold(&self.reasoning_buffer) {
             // Update the shimmer header to the extracted reasoning chunk header.
+            self.terminal_title_status_kind = TerminalTitleStatusKind::Thinking;
             self.set_status_header(header);
         } else {
             // Fallback while we don't yet have a bold header: leave existing header as-is.
@@ -1391,6 +1630,7 @@ impl ChatWidget {
         self.turn_sleep_inhibitor.set_turn_running(true);
         self.saw_plan_update_this_turn = false;
         self.saw_plan_item_this_turn = false;
+        self.last_plan_progress = None;
         self.plan_delta_buffer.clear();
         self.plan_item_active = false;
         self.adaptive_chunking.reset();
@@ -1404,6 +1644,7 @@ impl ChatWidget {
         self.retry_status_header = None;
         self.pending_status_indicator_restore = false;
         self.bottom_pane.set_interrupt_hint_visible(true);
+        self.terminal_title_status_kind = TerminalTitleStatusKind::Working;
         self.set_status_header(String::from("Working"));
         self.full_reasoning_buffer.clear();
         self.reasoning_buffer.clear();
@@ -1676,7 +1917,7 @@ impl ChatWidget {
         } else {
             self.rate_limit_snapshots_by_limit_id.clear();
         }
-        self.refresh_status_line();
+        self.refresh_status_surfaces();
     }
     /// Finalize any active exec as failed and stop/clear agent-turn UI state.
     ///
@@ -1907,6 +2148,17 @@ impl ChatWidget {
 
     fn on_plan_update(&mut self, update: UpdatePlanArgs) {
         self.saw_plan_update_this_turn = true;
+        let total = update.plan.len();
+        let completed = update
+            .plan
+            .iter()
+            .filter(|item| match &item.status {
+                StepStatus::Completed => true,
+                StepStatus::Pending | StepStatus::InProgress => false,
+            })
+            .count();
+        self.last_plan_progress = (total > 0).then_some((completed, total));
+        self.refresh_terminal_title();
         self.add_to_history(history_cell::new_plan_update(update));
     }
 
@@ -1995,6 +2247,7 @@ impl ChatWidget {
             // the transcript. Keep the header short so the interrupt hint remains visible.
             self.bottom_pane.ensure_status_indicator();
             self.bottom_pane.set_interrupt_hint_visible(true);
+            self.terminal_title_status_kind = TerminalTitleStatusKind::WaitingForBackgroundTerminal;
             self.set_status(
                 "Waiting for background terminal".to_string(),
                 command_display.clone(),
@@ -2226,7 +2479,7 @@ impl ChatWidget {
 
     fn on_turn_diff(&mut self, unified_diff: String) {
         debug!("TurnDiffEvent: {unified_diff}");
-        self.refresh_status_line();
+        self.refresh_status_surfaces();
     }
 
     fn on_deprecation_notice(&mut self, event: DeprecationNoticeEvent) {
@@ -2239,6 +2492,7 @@ impl ChatWidget {
         debug!("BackgroundEvent: {message}");
         self.bottom_pane.ensure_status_indicator();
         self.bottom_pane.set_interrupt_hint_visible(true);
+        self.terminal_title_status_kind = TerminalTitleStatusKind::Thinking;
         self.set_status_header(message);
     }
 
@@ -2248,6 +2502,7 @@ impl ChatWidget {
         let message = event
             .message
             .unwrap_or_else(|| "Undo in progress...".to_string());
+        self.terminal_title_status_kind = TerminalTitleStatusKind::Undoing;
         self.set_status_header(message);
     }
 
@@ -2273,6 +2528,7 @@ impl ChatWidget {
             self.retry_status_header = Some(self.current_status_header.clone());
         }
         self.bottom_pane.ensure_status_indicator();
+        self.terminal_title_status_kind = TerminalTitleStatusKind::Thinking;
         self.set_status(
             message,
             additional_details,
@@ -2749,6 +3005,7 @@ impl ChatWidget {
             feedback_audience,
             model,
             status_line_invalid_items_warned,
+            terminal_title_invalid_items_warned,
             otel_manager,
         } = common;
         let model = model.filter(|m| !m.trim().is_empty());
@@ -2837,6 +3094,7 @@ impl ChatWidget {
             reasoning_buffer: String::new(),
             full_reasoning_buffer: String::new(),
             current_status_header: String::from("Working"),
+            terminal_title_status_kind: TerminalTitleStatusKind::Working,
             retry_status_header: None,
             pending_status_indicator_restore: false,
             thread_id: None,
@@ -2855,6 +3113,7 @@ impl ChatWidget {
             had_work_activity: false,
             saw_plan_update_this_turn: false,
             saw_plan_item_this_turn: false,
+            last_plan_progress: None,
             plan_delta_buffer: String::new(),
             plan_item_active: false,
             last_separator_elapsed_secs: None,
@@ -2866,6 +3125,10 @@ impl ChatWidget {
             current_cwd,
             session_network_proxy: None,
             status_line_invalid_items_warned,
+            terminal_title_invalid_items_warned,
+            last_terminal_title: None,
+            terminal_title_setup_original_items: None,
+            status_line_project_root_name_cache: None,
             status_line_branch: None,
             status_line_branch_cwd: None,
             status_line_branch_pending: false,
@@ -2907,6 +3170,8 @@ impl ChatWidget {
             .bottom_pane
             .set_connectors_enabled(widget.config.features.enabled(Feature::Apps));
 
+        widget.refresh_terminal_title();
+
         widget
     }
 
@@ -2927,6 +3192,7 @@ impl ChatWidget {
             feedback_audience,
             model,
             status_line_invalid_items_warned,
+            terminal_title_invalid_items_warned,
             otel_manager,
         } = common;
         let model = model.filter(|m| !m.trim().is_empty());
@@ -3014,6 +3280,7 @@ impl ChatWidget {
             reasoning_buffer: String::new(),
             full_reasoning_buffer: String::new(),
             current_status_header: String::from("Working"),
+            terminal_title_status_kind: TerminalTitleStatusKind::Working,
             retry_status_header: None,
             pending_status_indicator_restore: false,
             thread_id: None,
@@ -3021,6 +3288,7 @@ impl ChatWidget {
             forked_from: None,
             saw_plan_update_this_turn: false,
             saw_plan_item_this_turn: false,
+            last_plan_progress: None,
             plan_delta_buffer: String::new(),
             plan_item_active: false,
             queued_user_messages: VecDeque::new(),
@@ -3043,6 +3311,10 @@ impl ChatWidget {
             current_cwd,
             session_network_proxy: None,
             status_line_invalid_items_warned,
+            terminal_title_invalid_items_warned,
+            last_terminal_title: None,
+            terminal_title_setup_original_items: None,
+            status_line_project_root_name_cache: None,
             status_line_branch: None,
             status_line_branch_cwd: None,
             status_line_branch_pending: false,
@@ -3070,6 +3342,7 @@ impl ChatWidget {
         widget
             .bottom_pane
             .set_queued_message_edit_binding(widget.queued_message_edit_binding);
+        widget.refresh_terminal_title();
 
         widget
     }
@@ -3093,6 +3366,7 @@ impl ChatWidget {
             feedback_audience,
             model,
             status_line_invalid_items_warned,
+            terminal_title_invalid_items_warned,
             otel_manager,
         } = common;
         let model = model.filter(|m| !m.trim().is_empty());
@@ -3180,6 +3454,7 @@ impl ChatWidget {
             reasoning_buffer: String::new(),
             full_reasoning_buffer: String::new(),
             current_status_header: String::from("Working"),
+            terminal_title_status_kind: TerminalTitleStatusKind::Working,
             retry_status_header: None,
             pending_status_indicator_restore: false,
             thread_id: None,
@@ -3198,6 +3473,7 @@ impl ChatWidget {
             had_work_activity: false,
             saw_plan_update_this_turn: false,
             saw_plan_item_this_turn: false,
+            last_plan_progress: None,
             plan_delta_buffer: String::new(),
             plan_item_active: false,
             last_separator_elapsed_secs: None,
@@ -3209,6 +3485,10 @@ impl ChatWidget {
             current_cwd,
             session_network_proxy: None,
             status_line_invalid_items_warned,
+            terminal_title_invalid_items_warned,
+            last_terminal_title: None,
+            terminal_title_setup_original_items: None,
+            status_line_project_root_name_cache: None,
             status_line_branch: None,
             status_line_branch_cwd: None,
             status_line_branch_pending: false,
@@ -3245,6 +3525,7 @@ impl ChatWidget {
                 ),
         );
         widget.update_collaboration_mode_indicator();
+        widget.refresh_terminal_title();
 
         widget
     }
@@ -3706,6 +3987,9 @@ impl ChatWidget {
             SlashCommand::DebugConfig => {
                 self.add_debug_config_output();
             }
+            SlashCommand::Title => {
+                self.open_terminal_title_setup();
+            }
             SlashCommand::Statusline => {
                 self.open_status_line_setup();
             }
@@ -4717,6 +5001,16 @@ impl ChatWidget {
         self.bottom_pane.show_selection_view(params);
     }
 
+    fn open_terminal_title_setup(&mut self) {
+        let configured_terminal_title_items = self.configured_terminal_title_items();
+        self.terminal_title_setup_original_items = Some(self.config.tui_terminal_title.clone());
+        let view = TerminalTitleSetupView::new(
+            Some(configured_terminal_title_items.as_slice()),
+            self.app_event_tx.clone(),
+        );
+        self.bottom_pane.show_view(Box::new(view));
+    }
+
     /// Parses configured status-line ids into known items and collects unknown ids.
     ///
     /// Unknown ids are deduplicated in insertion order for warning messages.
@@ -4746,12 +5040,46 @@ impl ChatWidget {
         })
     }
 
+    /// Parses configured terminal-title ids into known items and collects unknown ids.
+    ///
+    /// Unknown ids are deduplicated in insertion order for warning messages.
+    fn terminal_title_items_with_invalids(&self) -> (Vec<TerminalTitleItem>, Vec<String>) {
+        let mut invalid = Vec::new();
+        let mut invalid_seen = HashSet::new();
+        let mut items = Vec::new();
+        for id in self.configured_terminal_title_items() {
+            match id.parse::<TerminalTitleItem>() {
+                Ok(item) => items.push(item),
+                Err(_) => {
+                    if invalid_seen.insert(id.clone()) {
+                        invalid.push(format!(r#""{id}""#));
+                    }
+                }
+            }
+        }
+        (items, invalid)
+    }
+
+    /// Returns the configured terminal-title ids, or the default ordering when unset.
+    fn configured_terminal_title_items(&self) -> Vec<String> {
+        self.config.tui_terminal_title.clone().unwrap_or_else(|| {
+            DEFAULT_TERMINAL_TITLE_ITEMS
+                .iter()
+                .map(ToString::to_string)
+                .collect()
+        })
+    }
+
     fn status_line_cwd(&self) -> &Path {
         self.current_cwd.as_ref().unwrap_or(&self.config.cwd)
     }
 
-    fn status_line_project_root(&self) -> Option<PathBuf> {
-        let cwd = self.status_line_cwd();
+    /// Resolves the project root associated with `cwd`.
+    ///
+    /// Git repository root wins when available. Otherwise we fall back to the
+    /// nearest project config layer so non-git projects can still surface a
+    /// stable project label.
+    fn status_line_project_root_for_cwd(&self, cwd: &Path) -> Option<PathBuf> {
         if let Some(repo_root) = get_git_repo_root(cwd) {
             return Some(repo_root);
         }
@@ -4768,14 +5096,47 @@ impl ChatWidget {
             })
     }
 
-    fn status_line_project_root_name(&self) -> Option<String> {
-        self.status_line_project_root().map(|root| {
+    fn status_line_project_root_name_for_cwd(&self, cwd: &Path) -> Option<String> {
+        self.status_line_project_root_for_cwd(cwd).map(|root| {
             root.file_name()
                 .map(|name| name.to_string_lossy().to_string())
                 .unwrap_or_else(|| format_directory_display(&root, None))
         })
     }
 
+    /// Returns a cached project-root display name for the active cwd.
+    fn status_line_project_root_name(&mut self) -> Option<String> {
+        let cwd = self.status_line_cwd().to_path_buf();
+        if let Some(cache) = &self.status_line_project_root_name_cache
+            && cache.cwd == cwd
+        {
+            return cache.root_name.clone();
+        }
+
+        let root_name = self.status_line_project_root_name_for_cwd(&cwd);
+        self.status_line_project_root_name_cache = Some(CachedProjectRootName {
+            cwd,
+            root_name: root_name.clone(),
+        });
+        root_name
+    }
+
+    /// Produces the terminal-title `project` value.
+    ///
+    /// This prefers the cached project-root name and falls back to the current
+    /// directory name when no project root can be inferred.
+    fn terminal_title_project_name(&mut self) -> Option<String> {
+        let project = self.status_line_project_root_name().or_else(|| {
+            let cwd = self.status_line_cwd();
+            Some(
+                cwd.file_name()
+                    .map(|name| name.to_string_lossy().to_string())
+                    .unwrap_or_else(|| format_directory_display(cwd, None)),
+            )
+        })?;
+        Some(Self::truncate_terminal_title_part(project, 24))
+    }
+
     /// Resets git-branch cache state when the status-line cwd changes.
     ///
     /// The branch cache is keyed by cwd because branch lookup is performed relative to that path.
@@ -4815,7 +5176,7 @@ impl ChatWidget {
     /// Returning `None` means "omit this item for now", not "configuration error". Callers rely on
     /// this to keep partially available status lines readable while waiting for session, token, or
     /// git metadata.
-    fn status_line_value_for_item(&self, item: &StatusLineItem) -> Option<String> {
+    fn status_line_value_for_item(&mut self, item: &StatusLineItem) -> Option<String> {
         match item {
             StatusLineItem::ModelName => Some(self.model_display_name().to_string()),
             StatusLineItem::ModelWithReasoning => {
@@ -4881,6 +5242,81 @@ impl ChatWidget {
         }
     }
 
+    /// Resolves one configured terminal-title item into a displayable segment.
+    ///
+    /// Returning `None` means "omit this segment for now" so callers can keep
+    /// the configured order while hiding values that are not yet available.
+    fn terminal_title_value_for_item(&mut self, item: &TerminalTitleItem) -> Option<String> {
+        match item {
+            TerminalTitleItem::Project => self.terminal_title_project_name(),
+            TerminalTitleItem::Status => Some(self.terminal_title_status_text()),
+            TerminalTitleItem::Thread => self.thread_name.as_ref().and_then(|name| {
+                let trimmed = name.trim();
+                if trimmed.is_empty() {
+                    None
+                } else {
+                    Some(Self::truncate_terminal_title_part(trimmed.to_string(), 48))
+                }
+            }),
+            TerminalTitleItem::GitBranch => self
+                .status_line_branch
+                .as_ref()
+                .map(|branch| Self::truncate_terminal_title_part(branch.clone(), 32)),
+            TerminalTitleItem::Model => Some(Self::truncate_terminal_title_part(
+                self.model_display_name().to_string(),
+                32,
+            )),
+            TerminalTitleItem::TaskProgress => self.terminal_title_task_progress(),
+        }
+    }
+
+    /// Computes the compact runtime status label used by the terminal title.
+    ///
+    /// Startup takes precedence over normal task states, and idle state renders
+    /// as `Ready` regardless of the last active status bucket.
+    fn terminal_title_status_text(&self) -> String {
+        if self.mcp_startup_status.is_some() {
+            return "Starting...".to_string();
+        }
+
+        if !self.bottom_pane.is_task_running() {
+            return "Ready".to_string();
+        }
+
+        match self.terminal_title_status_kind {
+            TerminalTitleStatusKind::Working => "Working...".to_string(),
+            TerminalTitleStatusKind::WaitingForBackgroundTerminal => "Waiting...".to_string(),
+            TerminalTitleStatusKind::Undoing => "Undoing...".to_string(),
+            TerminalTitleStatusKind::Thinking => "Thinking...".to_string(),
+        }
+    }
+
+    /// Formats the last `update_plan` progress snapshot for terminal-title display.
+    fn terminal_title_task_progress(&self) -> Option<String> {
+        let (completed, total) = self.last_plan_progress?;
+        if total == 0 {
+            return None;
+        }
+        Some(format!("Tasks {completed}/{total}"))
+    }
+
+    /// Truncates a title segment by grapheme cluster and appends `...` when needed.
+    fn truncate_terminal_title_part(value: String, max_chars: usize) -> String {
+        if max_chars == 0 {
+            return String::new();
+        }
+
+        let mut graphemes = value.graphemes(true);
+        let head: String = graphemes.by_ref().take(max_chars).collect();
+        if graphemes.next().is_none() || max_chars <= 3 {
+            return head;
+        }
+
+        let mut truncated = head.graphemes(true).take(max_chars - 3).collect::<String>();
+        truncated.push_str("...");
+        truncated
+    }
+
     fn status_line_context_window_size(&self) -> Option<i64> {
         self.token_info
             .as_ref()
@@ -6768,6 +7204,7 @@ impl ChatWidget {
         self.session_header.set_model(effective.model());
         // Keep composer paste affordances aligned with the currently effective model.
         self.sync_image_paste_enabled();
+        self.refresh_terminal_title();
     }
 
     fn model_display_name(&self) -> &str {
@@ -7734,8 +8171,11 @@ fn has_websocket_timing_metrics(summary: RuntimeMetricsSummary) -> bool {
 
 impl Drop for ChatWidget {
     fn drop(&mut self) {
-        self.reset_realtime_conversation_state();
+        if let Err(err) = self.clear_managed_terminal_title() {
+            tracing::debug!(error = %err, "failed to clear terminal title on drop");
+        }
         self.stop_rate_limit_poller();
+        self.reset_realtime_conversation_state();
     }
 }
 

codex-rs/tui/src/chatwidget/tests.rs

@@ -1578,6 +1578,7 @@ async fn helpers_are_available_and_do_not_panic() {
         feedback_audience: FeedbackAudience::External,
         model: Some(resolved_model),
         status_line_invalid_items_warned: Arc::new(AtomicBool::new(false)),
+        terminal_title_invalid_items_warned: Arc::new(AtomicBool::new(false)),
         otel_manager,
     };
     let mut w = ChatWidget::new(init, thread_manager);
@@ -1690,6 +1691,7 @@ async fn make_chatwidget_manual(
         reasoning_buffer: String::new(),
         full_reasoning_buffer: String::new(),
         current_status_header: String::from("Working"),
+        terminal_title_status_kind: TerminalTitleStatusKind::Working,
         retry_status_header: None,
         pending_status_indicator_restore: false,
         thread_id: None,
@@ -1709,6 +1711,7 @@ async fn make_chatwidget_manual(
         had_work_activity: false,
         saw_plan_update_this_turn: false,
         saw_plan_item_this_turn: false,
+        last_plan_progress: None,
         plan_delta_buffer: String::new(),
         plan_item_active: false,
         last_separator_elapsed_secs: None,
@@ -1720,6 +1723,10 @@ async fn make_chatwidget_manual(
         current_cwd: None,
         session_network_proxy: None,
         status_line_invalid_items_warned: Arc::new(AtomicBool::new(false)),
+        terminal_title_invalid_items_warned: Arc::new(AtomicBool::new(false)),
+        last_terminal_title: None,
+        terminal_title_setup_original_items: None,
+        status_line_project_root_name_cache: None,
         status_line_branch: None,
         status_line_branch_cwd: None,
         status_line_branch_pending: false,
@@ -4476,6 +4483,7 @@ async fn collaboration_modes_defaults_to_code_on_startup() {
         feedback_audience: FeedbackAudience::External,
         model: Some(resolved_model.clone()),
         status_line_invalid_items_warned: Arc::new(AtomicBool::new(false)),
+        terminal_title_invalid_items_warned: Arc::new(AtomicBool::new(false)),
         otel_manager,
     };
 
@@ -4525,6 +4533,7 @@ async fn experimental_mode_plan_is_ignored_on_startup() {
         feedback_audience: FeedbackAudience::External,
         model: Some(resolved_model.clone()),
         status_line_invalid_items_warned: Arc::new(AtomicBool::new(false)),
+        terminal_title_invalid_items_warned: Arc::new(AtomicBool::new(false)),
         otel_manager,
     };
 
@@ -8047,7 +8056,7 @@ async fn status_line_invalid_items_warn_once() {
     ]);
     chat.thread_id = Some(ThreadId::new());
 
-    chat.refresh_status_line();
+    chat.refresh_status_surfaces();
     let cells = drain_insert_history(&mut rx);
     assert_eq!(cells.len(), 1, "expected one warning history cell");
     let rendered = lines_to_single_string(&cells[0]);
@@ -8056,7 +8065,7 @@ async fn status_line_invalid_items_warn_once() {
         "warning cell missing invalid item content: {rendered}"
     );
 
-    chat.refresh_status_line();
+    chat.refresh_status_surfaces();
     let cells = drain_insert_history(&mut rx);
     assert!(
         cells.is_empty(),
@@ -8064,6 +8073,79 @@ async fn status_line_invalid_items_warn_once() {
     );
 }
 
+#[tokio::test]
+async fn terminal_title_setup_cancel_reverts_live_preview() {
+    let (mut chat, _rx, _op_rx) = make_chatwidget_manual(None).await;
+    let original = chat.config.tui_terminal_title.clone();
+
+    chat.open_terminal_title_setup();
+    chat.preview_terminal_title(vec![TerminalTitleItem::Thread, TerminalTitleItem::Status]);
+
+    assert_eq!(
+        chat.config.tui_terminal_title,
+        Some(vec!["thread".to_string(), "status".to_string()])
+    );
+    assert_eq!(
+        chat.terminal_title_setup_original_items,
+        Some(original.clone())
+    );
+
+    chat.cancel_terminal_title_setup();
+
+    assert_eq!(chat.config.tui_terminal_title, original);
+    assert_eq!(chat.terminal_title_setup_original_items, None);
+}
+
+#[tokio::test]
+async fn terminal_title_status_uses_waiting_ellipsis_for_background_terminal() {
+    let (mut chat, _rx, _op_rx) = make_chatwidget_manual(None).await;
+    chat.on_task_started();
+    terminal_interaction(&mut chat, "call-1", "proc-1", "");
+
+    assert_eq!(chat.terminal_title_status_text(), "Waiting...");
+}
+
+#[tokio::test]
+async fn terminal_title_status_uses_ellipses_for_other_transient_states() {
+    let (mut chat, _rx, _op_rx) = make_chatwidget_manual(None).await;
+
+    chat.mcp_startup_status = Some(std::collections::HashMap::new());
+    assert_eq!(chat.terminal_title_status_text(), "Starting...");
+
+    chat.mcp_startup_status = None;
+    chat.on_task_started();
+    assert_eq!(chat.terminal_title_status_text(), "Working...");
+
+    chat.handle_codex_event(Event {
+        id: "undo-1".to_string(),
+        msg: EventMsg::UndoStarted(UndoStartedEvent {
+            message: Some("Undoing changes".to_string()),
+        }),
+    });
+    assert_eq!(chat.terminal_title_status_text(), "Undoing...");
+
+    chat.on_agent_reasoning_delta("**Planning**\nmore".to_string());
+    assert_eq!(chat.terminal_title_status_text(), "Thinking...");
+}
+
+#[tokio::test]
+async fn on_task_started_resets_terminal_title_task_progress() {
+    let (mut chat, _rx, _op_rx) = make_chatwidget_manual(None).await;
+    chat.last_plan_progress = Some((2, 5));
+
+    chat.on_task_started();
+
+    assert_eq!(chat.last_plan_progress, None);
+    assert_eq!(chat.terminal_title_task_progress(), None);
+}
+
+#[test]
+fn terminal_title_part_truncation_preserves_grapheme_clusters() {
+    let value = "ab👩‍💻cdefg".to_string();
+    let truncated = ChatWidget::truncate_terminal_title_part(value, 7);
+    assert_eq!(truncated, "ab👩‍💻c...");
+}
+
 #[tokio::test]
 async fn status_line_branch_state_resets_when_git_branch_disabled() {
     let (mut chat, _rx, _op_rx) = make_chatwidget_manual(None).await;
@@ -8072,7 +8154,7 @@ async fn status_line_branch_state_resets_when_git_branch_disabled() {
     chat.status_line_branch_lookup_complete = true;
     chat.config.tui_status_line = Some(vec!["model_name".to_string()]);
 
-    chat.refresh_status_line();
+    chat.refresh_status_surfaces();
 
     assert_eq!(chat.status_line_branch, None);
     assert!(!chat.status_line_branch_pending);
@@ -8097,6 +8179,25 @@ async fn status_line_branch_refreshes_after_turn_complete() {
     assert!(chat.status_line_branch_pending);
 }
 
+#[tokio::test]
+async fn status_line_branch_refreshes_after_turn_complete_when_terminal_title_uses_git_branch() {
+    let (mut chat, _rx, _op_rx) = make_chatwidget_manual(None).await;
+    chat.config.tui_status_line = Some(Vec::new());
+    chat.config.tui_terminal_title = Some(vec!["git-branch".to_string()]);
+    chat.status_line_branch_lookup_complete = true;
+    chat.status_line_branch_pending = false;
+
+    chat.handle_codex_event(Event {
+        id: "turn-1".into(),
+        msg: EventMsg::TurnComplete(TurnCompleteEvent {
+            turn_id: "turn-1".to_string(),
+            last_agent_message: None,
+        }),
+    });
+
+    assert!(chat.status_line_branch_pending);
+}
+
 #[tokio::test]
 async fn status_line_branch_refreshes_after_interrupt() {
     let (mut chat, _rx, _op_rx) = make_chatwidget_manual(None).await;

codex-rs/tui/src/lib.rs

@@ -106,6 +106,7 @@ mod status_indicator_widget;
 mod streaming;
 mod style;
 mod terminal_palette;
+mod terminal_title;
 mod text_formatting;
 mod theme_picker;
 mod tooltips;

codex-rs/tui/src/slash_command.rs

@@ -37,6 +37,7 @@ pub enum SlashCommand {
     Mention,
     Status,
     DebugConfig,
+    Title,
     Statusline,
     Theme,
     Mcp,
@@ -80,6 +81,7 @@ impl SlashCommand {
             SlashCommand::Skills => "use skills to improve how Codex performs specific tasks",
             SlashCommand::Status => "show current session configuration and token usage",
             SlashCommand::DebugConfig => "show config layers and requirement sources for debugging",
+            SlashCommand::Title => "configure which items appear in the terminal title",
             SlashCommand::Statusline => "configure which items appear in the status line",
             SlashCommand::Theme => "choose a syntax highlighting theme",
             SlashCommand::Ps => "list background terminals",
@@ -167,6 +169,7 @@ impl SlashCommand {
             SlashCommand::Agent => true,
             SlashCommand::Statusline => false,
             SlashCommand::Theme => false,
+            SlashCommand::Title => false,
         }
     }
 

codex-rs/tui/src/terminal_title.rs

@@ -0,0 +1,184 @@
+//! Terminal-title output helpers for the TUI.
+//!
+//! This module owns the low-level OSC title write path and the sanitization
+//! that happens immediately before we emit it. It is intentionally narrow:
+//! callers decide when the title should change and whether an empty title means
+//! "leave the old title alone" or "clear the title Codex last wrote".
+//! This module does not attempt to read or restore the terminal's previous
+//! title because that is not portable across terminals.
+
+use std::fmt;
+use std::io;
+use std::io::IsTerminal;
+use std::io::stdout;
+
+use crossterm::Command;
+use ratatui::crossterm::execute;
+
+const MAX_TERMINAL_TITLE_CHARS: usize = 240;
+
+#[derive(Debug, Clone, Copy, Eq, PartialEq)]
+pub(crate) enum SetTerminalTitleResult {
+    /// A sanitized title was written, or stdout is not a terminal so no write was needed.
+    Applied,
+    /// Sanitization removed every visible character, so no title was emitted.
+    ///
+    /// This is distinct from clearing the title. Callers decide whether an
+    /// empty post-sanitization value should result in no-op behavior, clearing
+    /// the title Codex manages, or some other fallback.
+    NoVisibleContent,
+}
+
+/// Writes a sanitized OSC window-title sequence to stdout.
+///
+/// The input is treated as untrusted display text: control characters,
+/// invisible formatting characters, and redundant whitespace are removed before
+/// the title is emitted. If sanitization removes all visible content, the
+/// function returns [`SetTerminalTitleResult::NoVisibleContent`] instead of
+/// clearing the title because clearing and restoring are policy decisions for
+/// higher-level callers.
+pub(crate) fn set_terminal_title(title: &str) -> io::Result<SetTerminalTitleResult> {
+    if !stdout().is_terminal() {
+        return Ok(SetTerminalTitleResult::Applied);
+    }
+
+    let title = sanitize_terminal_title(title);
+    if title.is_empty() {
+        return Ok(SetTerminalTitleResult::NoVisibleContent);
+    }
+
+    execute!(stdout(), SetWindowTitle(title))?;
+    Ok(SetTerminalTitleResult::Applied)
+}
+
+/// Clears the current terminal title by writing an empty OSC title payload.
+///
+/// This clears the visible title; it does not restore whatever title the shell
+/// or a previous program may have set before Codex started managing the title.
+pub(crate) fn clear_terminal_title() -> io::Result<()> {
+    if !stdout().is_terminal() {
+        return Ok(());
+    }
+
+    execute!(stdout(), SetWindowTitle(String::new()))
+}
+
+#[derive(Debug, Clone)]
+struct SetWindowTitle(String);
+
+impl Command for SetWindowTitle {
+    fn write_ansi(&self, f: &mut impl fmt::Write) -> fmt::Result {
+        // xterm/ctlseqs documents OSC 0/2 title sequences with ST (ESC \) termination.
+        // Most terminals also accept BEL for compatibility, but ST is the canonical form.
+        write!(f, "\x1b]0;{}\x1b\\", self.0)
+    }
+
+    #[cfg(windows)]
+    fn execute_winapi(&self) -> io::Result<()> {
+        Err(std::io::Error::other(
+            "tried to execute SetWindowTitle using WinAPI; use ANSI instead",
+        ))
+    }
+
+    #[cfg(windows)]
+    fn is_ansi_code_supported(&self) -> bool {
+        true
+    }
+}
+
+fn sanitize_terminal_title(title: &str) -> String {
+    let mut sanitized = String::new();
+    let mut chars_written = 0;
+    let mut pending_space = false;
+
+    for ch in title.chars() {
+        if ch.is_whitespace() {
+            pending_space = !sanitized.is_empty();
+            continue;
+        }
+
+        if is_disallowed_terminal_title_char(ch) {
+            continue;
+        }
+
+        if pending_space && chars_written < MAX_TERMINAL_TITLE_CHARS {
+            sanitized.push(' ');
+            chars_written += 1;
+            pending_space = false;
+        }
+
+        if chars_written >= MAX_TERMINAL_TITLE_CHARS {
+            break;
+        }
+
+        sanitized.push(ch);
+        chars_written += 1;
+    }
+
+    sanitized
+}
+
+fn is_disallowed_terminal_title_char(ch: char) -> bool {
+    if ch.is_control() {
+        return true;
+    }
+
+    // Strip Trojan-Source-related bidi controls plus common non-rendering
+    // formatting characters so title text cannot smuggle terminal control
+    // semantics or visually misleading content.
+    matches!(
+        ch,
+        '\u{00AD}'
+            | '\u{034F}'
+            | '\u{061C}'
+            | '\u{180E}'
+            | '\u{200B}'..='\u{200F}'
+            | '\u{202A}'..='\u{202E}'
+            | '\u{2060}'..='\u{206F}'
+            | '\u{FE00}'..='\u{FE0F}'
+            | '\u{FEFF}'
+            | '\u{FFF9}'..='\u{FFFB}'
+            | '\u{1BCA0}'..='\u{1BCA3}'
+            | '\u{E0100}'..='\u{E01EF}'
+    )
+}
+
+#[cfg(test)]
+mod tests {
+    use super::MAX_TERMINAL_TITLE_CHARS;
+    use super::SetWindowTitle;
+    use super::sanitize_terminal_title;
+    use crossterm::Command;
+    use pretty_assertions::assert_eq;
+
+    #[test]
+    fn sanitizes_terminal_title() {
+        let sanitized =
+            sanitize_terminal_title("  Project\t|\nWorking\x1b\x07\u{009D}\u{009C} |  Thread  ");
+        assert_eq!(sanitized, "Project | Working | Thread");
+    }
+
+    #[test]
+    fn strips_invisible_format_chars_from_terminal_title() {
+        let sanitized = sanitize_terminal_title(
+            "Pro\u{202E}j\u{2066}e\u{200F}c\u{061C}t\u{200B} \u{FEFF}T\u{2060}itle",
+        );
+        assert_eq!(sanitized, "Project Title");
+    }
+
+    #[test]
+    fn truncates_terminal_title() {
+        let input = "a".repeat(MAX_TERMINAL_TITLE_CHARS + 10);
+        let sanitized = sanitize_terminal_title(&input);
+        assert_eq!(sanitized.len(), MAX_TERMINAL_TITLE_CHARS);
+    }
+
+    #[test]
+    fn writes_osc_title_with_string_terminator() {
+        let mut out = String::new();
+        SetWindowTitle("hello".to_string())
+            .write_ansi(&mut out)
+            .expect("encode terminal title");
+        assert_eq!(out, "\x1b]0;hello\x1b\\");
+    }
+}