feat: add single-pod text selection

Cargo.lock

@@ -3958,6 +3958,7 @@ dependencies = [
 name = "tui"
 version = "0.1.0"
 dependencies = [
+ "base64",
  "client",
  "crossterm 0.28.1",
  "llm-worker",

crates/tui/Cargo.toml

@@ -12,6 +12,7 @@ e2e-test = []
 client = { workspace = true }
 protocol = { workspace = true }
 ratatui = { version = "0.30.0", features = ["scrolling-regions"] }
+base64 = "0.22.1"
 crossterm = "0.28"
 tokio = { workspace = true, features = ["rt-multi-thread", "macros", "net", "io-util", "sync", "time", "process"] }
 serde_json = { workspace = true }

crates/tui/src/app.rs

@@ -20,6 +20,7 @@ use crate::composer_history::{
 use crate::input::InputBuffer;
 use crate::scroll::Scroll;
 use crate::task::TaskStore;
+use crate::text_selection::TextSelectionState;
 use crate::view_mode::Mode;
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
@@ -293,6 +294,10 @@ pub struct App {
     /// `[Session TaskStore snapshot]` system messages — no protocol
     /// surface added on the Pod side.
     pub task_store: TaskStore,
+    /// Transient single-Pod transcript text selection. This is viewport-local
+    /// UI state only; it is never sent to the Pod, persisted, or appended to
+    /// session history/model context.
+    pub text_selection: TextSelectionState,
     /// Whether the right-side task pane is currently open.
     pub task_pane_open: bool,
     /// Top entry index of the task pane's visible window. Clamped on
@@ -351,6 +356,7 @@ impl App {
             rewind_refresh_fence: false,
             greeting: None,
             task_store: TaskStore::new(),
+            text_selection: TextSelectionState::default(),
             task_pane_open: false,
             task_pane_scroll: 0,
             queued_inputs: VecDeque::new(),

crates/tui/src/lib.rs

@@ -18,6 +18,7 @@ pub mod setup_model;
 mod single_pod;
 mod spawn;
 mod task;
+mod text_selection;
 mod tool;
 mod ui;
 mod view_mode;

crates/tui/src/single_pod.rs

@@ -10,8 +10,8 @@ use std::thread;
 use std::time::Duration;
 
 use crossterm::event::{
-    self, DisableMouseCapture, Event as TermEvent, KeyCode, KeyEvent, KeyModifiers, MouseEvent,
-    MouseEventKind,
+    self, DisableMouseCapture, Event as TermEvent, KeyCode, KeyEvent, KeyModifiers, MouseButton,
+    MouseEvent, MouseEventKind,
 };
 use crossterm::terminal::{EnterAlternateScreen, LeaveAlternateScreen};
 use crossterm::{Command, execute};
@@ -23,6 +23,7 @@ use ratatui::backend::CrosstermBackend;
 use session_store::SegmentId;
 use tokio::sync::mpsc;
 
+use base64::{Engine as _, engine::general_purpose::STANDARD as BASE64_STANDARD};
 use client::{PodClient, PodRuntimeCommand};
 
 use crate::app::{ActionbarNoticeLevel, ActionbarNoticeSource, App};
@@ -33,20 +34,19 @@ use crate::{multi_pod, picker, spawn, ui};
 
 type FullscreenTerminal = Terminal<CrosstermBackend<io::Stdout>>;
 
-/// Enable the narrowest standard xterm mouse mode that still reports wheel
-/// events. Crossterm's `EnableMouseCapture` also enables button-event
-/// tracking (`?1002h`), which requests drag-motion reports and interferes
-/// with terminal text selection more aggressively. Normal tracking (`?1000h`)
-/// reports button presses, releases, and wheel notches, but does not request
-/// drag-motion reports; the TUI ignores the non-wheel events.
+/// Enable SGR coordinates plus button-event tracking for Yoi-owned drag text
+/// selection in the single-Pod transcript. This intentionally opts out of
+/// terminal-native selection while the alternate screen is active, but still
+/// avoids all-motion tracking (`?1003h`).
 #[derive(Debug, Clone, Copy)]
-struct EnableWheelMouseCapture;
+struct EnableSinglePodMouseCapture;
 
-impl Command for EnableWheelMouseCapture {
+impl Command for EnableSinglePodMouseCapture {
     fn write_ansi(&self, f: &mut impl fmt::Write) -> fmt::Result {
-        // 1000: normal mouse tracking (includes wheel button presses)
         // 1006: SGR extended coordinates used by crossterm's parser
-        f.write_str("\x1B[?1000h\x1B[?1006h")
+        // 1000: normal mouse tracking (button presses/releases and wheel)
+        // 1002: button-event tracking (drag reports while a button is held)
+        f.write_str("\x1B[?1006h\x1B[?1000h\x1B[?1002h")
     }
 
     #[cfg(windows)]
@@ -60,6 +60,45 @@ impl Command for EnableWheelMouseCapture {
     }
 }
 
+fn copy_to_terminal_clipboard<W: io::Write>(out: &mut W, text: &str) -> io::Result<()> {
+    let encoded = BASE64_STANDARD.encode(text.as_bytes());
+    write!(out, "\x1B]52;c;{}\x07", encoded)?;
+    out.flush()
+}
+
+fn copy_selection_to_writer<W: io::Write>(app: &mut App, out: &mut W) -> bool {
+    let Some(text) = app.text_selection.copy_text() else {
+        return false;
+    };
+
+    let result = copy_to_terminal_clipboard(out, &text);
+    app.text_selection.clear();
+    match result {
+        Ok(()) => {
+            app.flash_actionbar_notice(
+                "Copied selected text to terminal clipboard.",
+                ActionbarNoticeLevel::Info,
+                ActionbarNoticeSource::Tui,
+                Duration::from_secs(3),
+            );
+        }
+        Err(_) => {
+            app.flash_actionbar_notice(
+                "Copy failed: terminal clipboard write failed.",
+                ActionbarNoticeLevel::Error,
+                ActionbarNoticeSource::Tui,
+                Duration::from_secs(5),
+            );
+        }
+    }
+    true
+}
+
+fn copy_selection_to_terminal(app: &mut App) -> bool {
+    let mut stdout = io::stdout();
+    copy_selection_to_writer(app, &mut stdout)
+}
+
 fn resolve_socket(pod_name: &str, override_path: Option<PathBuf>) -> PathBuf {
     if let Some(p) = override_path {
         return p;
@@ -294,10 +333,9 @@ pub(crate) async fn run_spawn(
 
 fn enter_fullscreen() -> Result<FullscreenTerminal, Box<dyn std::error::Error>> {
     let mut stdout = io::stdout();
-    // Enable only normal mouse tracking for wheel events. Avoid crossterm's
-    // full mouse capture because it requests drag-motion events and breaks
-    // terminal-native text selection.
-    execute!(stdout, EnterAlternateScreen, EnableWheelMouseCapture)?;
+    // Enable button-event tracking so the transcript can own drag selection;
+    // avoid all-motion capture because hover-motion reports are unnecessary.
+    execute!(stdout, EnterAlternateScreen, EnableSinglePodMouseCapture)?;
     let backend = CrosstermBackend::new(stdout);
     Ok(Terminal::new(backend)?)
 }
@@ -310,7 +348,7 @@ fn enter_fullscreen_existing(
     execute!(
         terminal.backend_mut(),
         EnterAlternateScreen,
-        EnableWheelMouseCapture
+        EnableSinglePodMouseCapture
     )?;
     Ok(())
 }
@@ -761,8 +799,25 @@ const PANE_SCROLL_LINES: usize = 5;
 
 fn handle_mouse(app: &mut App, mouse: MouseEvent) {
     match mouse.kind {
-        MouseEventKind::ScrollUp => app.scroll.scroll_up(WHEEL_LINES),
-        MouseEventKind::ScrollDown => app.scroll.scroll_down(WHEEL_LINES),
+        MouseEventKind::ScrollUp => {
+            app.text_selection.clear();
+            app.scroll.scroll_up(WHEEL_LINES);
+        }
+        MouseEventKind::ScrollDown => {
+            app.text_selection.clear();
+            app.scroll.scroll_down(WHEEL_LINES);
+        }
+        MouseEventKind::Down(MouseButton::Left) if app.rewind_picker.is_none() => {
+            if !app.text_selection.begin_drag(mouse.column, mouse.row) {
+                app.text_selection.clear();
+            }
+        }
+        MouseEventKind::Drag(MouseButton::Left) if app.rewind_picker.is_none() => {
+            app.text_selection.update_drag(mouse.column, mouse.row);
+        }
+        MouseEventKind::Up(MouseButton::Left) if app.rewind_picker.is_none() => {
+            app.text_selection.finish_drag(mouse.column, mouse.row);
+        }
         _ => {}
     }
 }
@@ -983,6 +1038,25 @@ fn handle_key(app: &mut App, key: KeyEvent) -> Option<Method> {
         }
     }
 
+    if key.modifiers.is_empty() {
+        match key.code {
+            KeyCode::Esc if app.text_selection.clear() => return None,
+            KeyCode::Char('y') if app.text_selection.has_selection() => {
+                if !copy_selection_to_terminal(app) {
+                    app.text_selection.clear();
+                    app.flash_actionbar_notice(
+                        "Selection contains no copyable text.",
+                        ActionbarNoticeLevel::Warn,
+                        ActionbarNoticeSource::Tui,
+                        Duration::from_secs(3),
+                    );
+                }
+                return None;
+            }
+            _ => {}
+        }
+    }
+
     match key.code {
         KeyCode::Esc => {
             // Close the popup if it's still showing (covers the
@@ -1128,18 +1202,116 @@ fn handle_pause_or_quit(app: &mut App) -> Option<Method> {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use crate::text_selection::{HistoryViewport, SelectionRow};
     use protocol::{Event, RewindTarget, RewindTargetId, Segment};
 
     #[test]
-    fn wheel_mouse_capture_uses_normal_tracking_without_drag_capture() {
+    fn single_pod_mouse_capture_enables_drag_without_all_motion() {
         let mut ansi = String::new();
-        Command::write_ansi(&EnableWheelMouseCapture, &mut ansi).unwrap();
+        Command::write_ansi(&EnableSinglePodMouseCapture, &mut ansi).unwrap();
 
-        assert_eq!(ansi, "\x1B[?1000h\x1B[?1006h");
-        assert!(!ansi.contains("?1002h"));
+        assert!(ansi.contains("?1000h"));
+        assert!(ansi.contains("?1002h"));
+        assert!(ansi.contains("?1006h"));
         assert!(!ansi.contains("?1003h"));
     }
 
+    #[test]
+    fn mouse_drag_updates_selection_state() {
+        let mut app = App::new("pod".into());
+        app.text_selection.set_history_snapshot(
+            HistoryViewport {
+                x: 1,
+                y: 2,
+                width: 20,
+                height: 3,
+                top_offset: 0,
+                total_lines: 1,
+            },
+            vec![SelectionRow::new("alpha".into(), true)],
+        );
+
+        handle_mouse(
+            &mut app,
+            MouseEvent {
+                kind: MouseEventKind::Down(MouseButton::Left),
+                column: 2,
+                row: 2,
+                modifiers: KeyModifiers::NONE,
+            },
+        );
+        handle_mouse(
+            &mut app,
+            MouseEvent {
+                kind: MouseEventKind::Drag(MouseButton::Left),
+                column: 4,
+                row: 2,
+                modifiers: KeyModifiers::NONE,
+            },
+        );
+        handle_mouse(
+            &mut app,
+            MouseEvent {
+                kind: MouseEventKind::Up(MouseButton::Left),
+                column: 4,
+                row: 2,
+                modifiers: KeyModifiers::NONE,
+            },
+        );
+
+        assert_eq!(app.text_selection.copy_text().as_deref(), Some("lph"));
+        assert!(!app.text_selection.active().unwrap().dragging);
+    }
+
+    #[test]
+    fn esc_clears_selection_without_editing_composer() {
+        let mut app = App::new("pod".into());
+        app.text_selection.set_history_snapshot(
+            HistoryViewport {
+                x: 0,
+                y: 0,
+                width: 10,
+                height: 1,
+                top_offset: 0,
+                total_lines: 1,
+            },
+            vec![SelectionRow::new("hello".into(), true)],
+        );
+        assert!(app.text_selection.begin_drag(0, 0));
+
+        assert!(handle_key(&mut app, key(KeyCode::Esc)).is_none());
+        assert!(!app.text_selection.has_selection());
+        assert!(app.input.is_empty());
+    }
+
+    #[test]
+    fn copy_selection_writes_osc52_and_clears_selection() {
+        let mut app = App::new("pod".into());
+        app.text_selection.set_history_snapshot(
+            HistoryViewport {
+                x: 0,
+                y: 0,
+                width: 10,
+                height: 1,
+                top_offset: 0,
+                total_lines: 1,
+            },
+            vec![SelectionRow::new("hello".into(), true)],
+        );
+        assert!(app.text_selection.begin_drag(0, 0));
+        assert!(app.text_selection.update_drag(4, 0));
+
+        let mut out = Vec::new();
+        assert!(copy_selection_to_writer(&mut app, &mut out));
+
+        assert_eq!(String::from_utf8(out).unwrap(), "\x1B]52;c;aGVsbG8=\x07");
+        assert!(!app.text_selection.has_selection());
+        assert!(
+            app.current_actionbar_notice(std::time::Instant::now())
+                .is_some()
+        );
+    }
+
     #[tokio::test]
     async fn terminal_event_is_selected_before_ready_pod_event() {
         let (tx, mut rx) = mpsc::unbounded_channel();

crates/tui/src/text_selection.rs

@@ -0,0 +1,367 @@
+//! Local, non-persistent text selection state for the single-Pod transcript view.
+//!
+//! This module deliberately stores only the most recent rendered history rows and
+//! the active drag endpoints. Selected/copied text never leaves TUI-local state
+//! unless the user explicitly presses the copy key, and even then the caller is
+//! responsible for using a non-history clipboard path.
+
+use unicode_width::{UnicodeWidthChar, UnicodeWidthStr};
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct SelectionPoint {
+    pub row: usize,
+    pub col: usize,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct HistoryViewport {
+    pub x: u16,
+    pub y: u16,
+    pub width: u16,
+    pub height: u16,
+    pub top_offset: usize,
+    pub total_lines: usize,
+}
+
+impl HistoryViewport {
+    pub fn contains(self, col: u16, row: u16) -> bool {
+        col >= self.x
+            && col < self.x.saturating_add(self.width)
+            && row >= self.y
+            && row < self.y.saturating_add(self.height)
+    }
+
+    pub fn point_at(self, col: u16, row: u16) -> Option<SelectionPoint> {
+        if !self.contains(col, row) {
+            return None;
+        }
+        Some(SelectionPoint {
+            row: self.top_offset + row.saturating_sub(self.y) as usize,
+            col: col.saturating_sub(self.x) as usize,
+        })
+    }
+
+    pub fn clamped_point_at(self, col: u16, row: u16) -> Option<SelectionPoint> {
+        if self.width == 0 || self.height == 0 || self.total_lines == 0 {
+            return None;
+        }
+        let max_col = self.x.saturating_add(self.width.saturating_sub(1));
+        let max_row = self.y.saturating_add(self.height.saturating_sub(1));
+        let col = col.clamp(self.x, max_col);
+        let row = row.clamp(self.y, max_row);
+        let absolute_row = self.top_offset + row.saturating_sub(self.y) as usize;
+        if absolute_row >= self.total_lines {
+            return None;
+        }
+        Some(SelectionPoint {
+            row: absolute_row,
+            col: col.saturating_sub(self.x) as usize,
+        })
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct SelectionRow {
+    pub text: String,
+    /// Whether this rendered row belongs to selectable transcript text. Tool
+    /// calls, thinking blocks, greetings, notices, stats, and other non-text
+    /// items are intentionally false.
+    pub selectable: bool,
+}
+
+impl SelectionRow {
+    pub fn new(text: String, selectable: bool) -> Self {
+        Self { text, selectable }
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct ActiveSelection {
+    pub anchor: SelectionPoint,
+    pub focus: SelectionPoint,
+    pub dragging: bool,
+}
+
+#[derive(Debug, Clone, Default)]
+pub struct TextSelectionState {
+    active: Option<ActiveSelection>,
+    viewport: Option<HistoryViewport>,
+    rows: Vec<SelectionRow>,
+}
+
+impl TextSelectionState {
+    pub fn set_history_snapshot(&mut self, viewport: HistoryViewport, rows: Vec<SelectionRow>) {
+        let rows_changed = self.rows != rows;
+        self.viewport = Some(viewport);
+        self.rows = rows;
+        if rows_changed {
+            self.active = None;
+        } else {
+            self.drop_selection_if_stale();
+        }
+    }
+
+    pub fn clear_history_snapshot(&mut self) {
+        self.viewport = None;
+        self.rows.clear();
+        self.active = None;
+    }
+
+    #[cfg(test)]
+    pub fn active(&self) -> Option<ActiveSelection> {
+        self.active
+    }
+
+    pub fn has_selection(&self) -> bool {
+        self.active.is_some()
+    }
+
+    pub fn clear(&mut self) -> bool {
+        self.active.take().is_some()
+    }
+
+    pub fn begin_drag(&mut self, col: u16, row: u16) -> bool {
+        let Some(point) = self
+            .viewport
+            .and_then(|viewport| viewport.point_at(col, row))
+        else {
+            return false;
+        };
+        if !self.row_is_selectable(point.row) {
+            self.active = None;
+            return false;
+        }
+        self.active = Some(ActiveSelection {
+            anchor: point,
+            focus: point,
+            dragging: true,
+        });
+        true
+    }
+
+    pub fn update_drag(&mut self, col: u16, row: u16) -> bool {
+        let Some(mut active) = self.active else {
+            return false;
+        };
+        if !active.dragging {
+            return false;
+        }
+        let Some(point) = self
+            .viewport
+            .and_then(|viewport| viewport.clamped_point_at(col, row))
+        else {
+            return false;
+        };
+        active.focus = point;
+        self.active = Some(active);
+        true
+    }
+
+    pub fn finish_drag(&mut self, col: u16, row: u16) -> bool {
+        let updated = self.update_drag(col, row);
+        if let Some(active) = self.active.as_mut() {
+            active.dragging = false;
+            true
+        } else {
+            updated
+        }
+    }
+
+    pub fn copy_text(&self) -> Option<String> {
+        let active = self.active?;
+        selected_text_from_rows(&self.rows, active.anchor, active.focus)
+    }
+
+    pub fn range_for_row(&self, row: usize) -> Option<(usize, usize)> {
+        let active = self.active?;
+        let (start, end) = ordered_points(active.anchor, active.focus);
+        if row < start.row || row > end.row || !self.row_is_selectable(row) {
+            return None;
+        }
+        let row_width = display_width(&self.rows.get(row)?.text);
+        let (from, to) = if start.row == end.row {
+            (
+                start.col.min(row_width),
+                end.col.saturating_add(1).min(row_width),
+            )
+        } else if row == start.row {
+            (start.col.min(row_width), row_width)
+        } else if row == end.row {
+            (0, end.col.saturating_add(1).min(row_width))
+        } else {
+            (0, row_width)
+        };
+        if from >= to { None } else { Some((from, to)) }
+    }
+
+    fn row_is_selectable(&self, row: usize) -> bool {
+        self.rows.get(row).is_some_and(|row| row.selectable)
+    }
+
+    fn drop_selection_if_stale(&mut self) {
+        let Some(active) = self.active else {
+            return;
+        };
+        if active.anchor.row >= self.rows.len() || active.focus.row >= self.rows.len() {
+            self.active = None;
+        }
+    }
+}
+
+pub fn selected_text_from_rows(
+    rows: &[SelectionRow],
+    anchor: SelectionPoint,
+    focus: SelectionPoint,
+) -> Option<String> {
+    let (start, end) = ordered_points(anchor, focus);
+    if start.row >= rows.len() || end.row >= rows.len() {
+        return None;
+    }
+
+    let mut copied = Vec::new();
+    for row_idx in start.row..=end.row {
+        let row = &rows[row_idx];
+        if !row.selectable {
+            continue;
+        }
+        let row_width = display_width(&row.text);
+        let (from, to) = if start.row == end.row {
+            (
+                start.col.min(row_width),
+                end.col.saturating_add(1).min(row_width),
+            )
+        } else if row_idx == start.row {
+            (start.col.min(row_width), row_width)
+        } else if row_idx == end.row {
+            (0, end.col.saturating_add(1).min(row_width))
+        } else {
+            (0, row_width)
+        };
+        copied.push(slice_display_cols(&row.text, from, to));
+    }
+
+    if copied.iter().any(|line| !line.is_empty()) {
+        Some(copied.join("\n"))
+    } else {
+        None
+    }
+}
+
+pub fn ordered_points(a: SelectionPoint, b: SelectionPoint) -> (SelectionPoint, SelectionPoint) {
+    if (a.row, a.col) <= (b.row, b.col) {
+        (a, b)
+    } else {
+        (b, a)
+    }
+}
+
+pub fn display_width(text: &str) -> usize {
+    UnicodeWidthStr::width(text)
+}
+
+pub fn slice_display_cols(text: &str, start: usize, end: usize) -> String {
+    if start >= end {
+        return String::new();
+    }
+
+    let mut out = String::new();
+    let mut col = 0usize;
+    for c in text.chars() {
+        let width = UnicodeWidthChar::width(c).unwrap_or(0);
+        let next = col.saturating_add(width);
+        if next > start && col < end {
+            out.push(c);
+        }
+        col = next;
+        if col >= end {
+            break;
+        }
+    }
+    out
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn coordinate_mapping_uses_history_inner_origin_and_scroll_offset() {
+        let viewport = HistoryViewport {
+            x: 2,
+            y: 3,
+            width: 10,
+            height: 5,
+            top_offset: 7,
+            total_lines: 20,
+        };
+
+        assert_eq!(
+            viewport.point_at(4, 5),
+            Some(SelectionPoint { row: 9, col: 2 })
+        );
+        assert_eq!(viewport.point_at(1, 5), None);
+        assert_eq!(viewport.point_at(4, 8), None);
+    }
+
+    #[test]
+    fn selection_state_drag_update_and_clear() {
+        let mut state = TextSelectionState::default();
+        state.set_history_snapshot(
+            HistoryViewport {
+                x: 0,
+                y: 0,
+                width: 20,
+                height: 3,
+                top_offset: 0,
+                total_lines: 3,
+            },
+            vec![
+                SelectionRow::new("alpha".into(), true),
+                SelectionRow::new("tool".into(), false),
+                SelectionRow::new("omega".into(), true),
+            ],
+        );
+
+        assert!(state.begin_drag(1, 0));
+        assert!(state.update_drag(2, 2));
+        assert_eq!(state.copy_text().as_deref(), Some("lpha\nome"));
+        assert!(state.finish_drag(2, 2));
+        assert!(!state.active().unwrap().dragging);
+        assert!(state.clear());
+        assert!(!state.has_selection());
+    }
+
+    #[test]
+    fn selected_text_preserves_blank_separator_between_text_items() {
+        let rows = vec![
+            SelectionRow::new("first".into(), true),
+            SelectionRow::new("".into(), true),
+            SelectionRow::new("second".into(), true),
+        ];
+
+        let copied = selected_text_from_rows(
+            &rows,
+            SelectionPoint { row: 0, col: 0 },
+            SelectionPoint { row: 2, col: 5 },
+        )
+        .unwrap();
+        assert_eq!(copied, "first\n\nsecond");
+    }
+
+    #[test]
+    fn non_text_rows_are_skipped_during_extraction() {
+        let rows = vec![
+            SelectionRow::new("user".into(), true),
+            SelectionRow::new("tool output".into(), false),
+            SelectionRow::new("assistant".into(), true),
+        ];
+
+        let copied = selected_text_from_rows(
+            &rows,
+            SelectionPoint { row: 0, col: 0 },
+            SelectionPoint { row: 2, col: 8 },
+        )
+        .unwrap();
+        assert_eq!(copied, "user\nassistant");
+    }
+}

crates/tui/src/ui.rs

@@ -31,6 +31,7 @@ use crate::app::{ActionbarNoticeLevel, App, CompletionState, alert_source_label,
 use crate::block::{Block, CompactEvent, ThinkingBlock, ThinkingState};
 use crate::command::CommandCandidate;
 use crate::task::{TaskCounts, TaskEntry, TaskStatus, TaskStore};
+use crate::text_selection::{HistoryViewport, SelectionRow};
 use crate::view_mode::Mode;
 
 pub fn draw(frame: &mut Frame, app: &mut App) {
@@ -306,55 +307,90 @@ fn input_area_height(render: &crate::input::InputRender, terminal_height: u16) -
     needed.clamp(1, cap)
 }
 
+pub struct HistoryRow {
+    pub line: Line<'static>,
+    pub text: String,
+    pub selectable: bool,
+}
+
+impl HistoryRow {
+    fn new(line: Line<'static>, selectable: bool) -> Self {
+        let text = line_text(&line);
+        Self {
+            line,
+            text,
+            selectable,
+        }
+    }
+
+    fn selection_row(&self) -> SelectionRow {
+        SelectionRow::new(self.text.clone(), self.selectable)
+    }
+}
+
 /// Pre-rendered history lines plus the line indices at which each turn
 /// begins (used for Ctrl-[/] jumps).
 pub struct HistoryLayout {
-    pub lines: Vec<Line<'static>>,
+    pub rows: Vec<HistoryRow>,
     pub turn_starts: Vec<usize>,
 }
 
 pub fn compute_history(app: &App, width: u16) -> HistoryLayout {
     // Step 1: collect logical lines from each block (unwrapped).
-    let mut logical: Vec<Line<'static>> = Vec::new();
+    let mut logical: Vec<(Line<'static>, bool)> = Vec::new();
     let mut logical_turn_starts: Vec<usize> = Vec::new();
     let mut first = true;
+    let mut previous_selectable = false;
     let mut i = 0;
     while i < app.blocks.len() {
+        let block = &app.blocks[i];
+        let current_selectable = block_is_selectable_text(block);
         if !first {
-            logical.push(Line::from(""));
+            // Preserve a deterministic blank-line separator when copying
+            // across text-like items. Tool/non-text item rows remain
+            // unselectable, but separators adjacent to text are copied as
+            // blank lines so cross-item extraction is stable.
+            logical.push((Line::from(""), previous_selectable || current_selectable));
         }
         first = false;
-        let block = &app.blocks[i];
         if matches!(block, Block::TurnHeader { .. }) {
             logical_turn_starts.push(logical.len());
         }
         if matches!(block, Block::ToolCall(_)) {
             let out = crate::tool::render_tool(&app.cache, &app.blocks, i, width, app.mode);
-            logical.extend(out.lines);
+            logical.extend(out.lines.into_iter().map(|line| (line, false)));
             i += out.consumed.max(1);
+            previous_selectable = false;
             continue;
         }
-        render_block_into(&mut logical, block, width, app.mode);
+        let mut block_lines = Vec::new();
+        render_block_into(&mut block_lines, block, width, app.mode);
+        logical.extend(
+            block_lines
+                .into_iter()
+                .map(|line| (line, current_selectable)),
+        );
+        previous_selectable = current_selectable;
         i += 1;
     }
 
     // Step 2: pre-wrap every logical line to char-based terminal rows so
     // scroll math is exact. Track the logical → wrapped mapping so
     // turn-start indices get translated into wrapped-row coordinates.
-    let mut lines: Vec<Line<'static>> = Vec::with_capacity(logical.len());
+    let mut rows: Vec<HistoryRow> = Vec::with_capacity(logical.len());
     let mut logical_to_wrapped: Vec<usize> = Vec::with_capacity(logical.len() + 1);
-    for line in logical {
-        logical_to_wrapped.push(lines.len());
-        wrap_line_into(line, width, &mut lines);
+    for (line, selectable) in logical {
+        logical_to_wrapped.push(rows.len());
+        wrap_history_row_into(line, selectable, width, &mut rows);
     }
-    logical_to_wrapped.push(lines.len());
+    logical_to_wrapped.push(rows.len());
 
     let turn_starts = logical_turn_starts
         .into_iter()
-        .map(|i| logical_to_wrapped.get(i).copied().unwrap_or(lines.len()))
+        .map(|i| logical_to_wrapped.get(i).copied().unwrap_or(rows.len()))
         .collect();
 
-    HistoryLayout { lines, turn_starts }
+    HistoryLayout { rows, turn_starts }
 }
 
 /// Horizontal gutter around the log area. Applied via a
@@ -369,6 +405,7 @@ fn draw_history(frame: &mut Frame, app: &mut App, area: Rect) {
         app.scroll.total_lines = 0;
         app.scroll.tail_top_offset = 0;
         app.scroll.turn_starts.clear();
+        app.text_selection.clear_history_snapshot();
         return;
     }
 
@@ -389,21 +426,23 @@ fn draw_history(frame: &mut Frame, app: &mut App, area: Rect) {
     let outer_block = UiBlock::default().padding(Padding::horizontal(HISTORY_PADDING));
     let inner = outer_block.inner(history_area);
     if inner.width == 0 || inner.height == 0 {
+        app.text_selection.clear_history_snapshot();
         return;
     }
 
     if let Some(picker) = app.rewind_picker.as_mut() {
+        app.text_selection.clear_history_snapshot();
         draw_rewind_picker(frame, history_area, inner, outer_block, picker);
         return;
     }
 
-    let HistoryLayout { lines, turn_starts } = compute_history(app, inner.width);
+    let HistoryLayout { rows, turn_starts } = compute_history(app, inner.width);
 
-    // `lines` is already pre-wrapped: 1 entry == 1 terminal row. Scroll
+    // `rows` is already pre-wrapped: 1 entry == 1 terminal row. Scroll
     // math degenerates to index arithmetic.
-    let tail_top = lines.len().saturating_sub(inner.height as usize);
+    let tail_top = rows.len().saturating_sub(inner.height as usize);
     app.scroll.area_height = inner.height;
-    app.scroll.total_lines = lines.len();
+    app.scroll.total_lines = rows.len();
     app.scroll.tail_top_offset = tail_top;
     app.scroll.turn_starts = turn_starts;
 
@@ -413,8 +452,30 @@ fn draw_history(frame: &mut Frame, app: &mut App, area: Rect) {
         app.scroll.top_offset = app.scroll.top_offset.min(tail_top);
     }
 
-    let end = (app.scroll.top_offset + inner.height as usize).min(lines.len());
-    let visible: Vec<Line<'static>> = lines[app.scroll.top_offset..end].to_vec();
+    app.text_selection.set_history_snapshot(
+        HistoryViewport {
+            x: inner.x,
+            y: inner.y,
+            width: inner.width,
+            height: inner.height,
+            top_offset: app.scroll.top_offset,
+            total_lines: rows.len(),
+        },
+        rows.iter().map(HistoryRow::selection_row).collect(),
+    );
+
+    let end = (app.scroll.top_offset + inner.height as usize).min(rows.len());
+    let visible: Vec<Line<'static>> = rows[app.scroll.top_offset..end]
+        .iter()
+        .enumerate()
+        .map(|(offset, row)| {
+            let absolute_row = app.scroll.top_offset + offset;
+            match app.text_selection.range_for_row(absolute_row) {
+                Some((from, to)) => highlight_line_selection(&row.line, from, to),
+                None => row.line.clone(),
+            }
+        })
+        .collect();
 
     // Pre-wrapped input → render without ratatui's word-wrap (which
     // would otherwise re-wrap mid-row at word boundaries and desync the
@@ -717,6 +778,88 @@ fn wrap_line_into(line: Line<'static>, width: u16, out: &mut Vec<Line<'static>>)
     push_row(&mut current, &mut row_width, out);
 }
 
+fn wrap_history_row_into(
+    line: Line<'static>,
+    selectable: bool,
+    width: u16,
+    out: &mut Vec<HistoryRow>,
+) {
+    let mut wrapped = Vec::new();
+    wrap_line_into(line, width, &mut wrapped);
+    out.extend(
+        wrapped
+            .into_iter()
+            .map(|line| HistoryRow::new(line, selectable)),
+    );
+}
+
+fn line_text(line: &Line<'_>) -> String {
+    line.spans
+        .iter()
+        .map(|span| span.content.as_ref())
+        .collect::<String>()
+}
+
+fn highlight_line_selection(line: &Line<'static>, start: usize, end: usize) -> Line<'static> {
+    if start >= end {
+        return line.clone();
+    }
+
+    let highlight = Style::default().fg(Color::Black).bg(Color::Cyan);
+    let mut col = 0usize;
+    let mut spans = Vec::new();
+    for span in &line.spans {
+        let mut plain = String::new();
+        let mut selected = String::new();
+        let push_pending =
+            |plain: &mut String, selected: &mut String, spans: &mut Vec<Span<'static>>| {
+                if !plain.is_empty() {
+                    spans.push(Span::styled(std::mem::take(plain), span.style));
+                }
+                if !selected.is_empty() {
+                    spans.push(Span::styled(
+                        std::mem::take(selected),
+                        span.style.patch(highlight),
+                    ));
+                }
+            };
+
+        let mut in_selected = false;
+        for ch in span.content.chars() {
+            let width = UnicodeWidthChar::width(ch).unwrap_or(0);
+            let next = col.saturating_add(width);
+            let selected_char = next > start && col < end;
+            if selected_char != in_selected {
+                push_pending(&mut plain, &mut selected, &mut spans);
+                in_selected = selected_char;
+            }
+            if selected_char {
+                selected.push(ch);
+            } else {
+                plain.push(ch);
+            }
+            col = next;
+        }
+        push_pending(&mut plain, &mut selected, &mut spans);
+    }
+
+    Line {
+        spans,
+        style: line.style,
+        alignment: line.alignment,
+    }
+}
+
+/// Only text-like transcript Items are selectable/copyable. Tool calls and
+/// other non-text Items remain visible but unselectable, so their rendered
+/// diagnostics/output are never copied through this path.
+fn block_is_selectable_text(block: &Block) -> bool {
+    matches!(
+        block,
+        Block::UserMessage { .. } | Block::SystemMessage { .. } | Block::AssistantText { .. }
+    )
+}
+
 fn render_block_into(lines: &mut Vec<Line<'static>>, block: &Block, width: u16, mode: Mode) {
     match block {
         Block::Greeting(g) => match mode {
@@ -1668,4 +1811,41 @@ mod tests {
             Some("retrying LLM request".into())
         );
     }
+
+    #[test]
+    fn history_rows_mark_text_items_selectable_and_non_text_unselectable() {
+        let mut app = App::new("pod".to_string());
+        app.blocks = vec![
+            Block::UserMessage {
+                segments: vec![Segment::Text {
+                    content: "hello".to_string(),
+                }],
+            },
+            Block::AssistantText {
+                text: "world".to_string(),
+            },
+            Block::Thinking(ThinkingBlock {
+                text: "private reasoning".to_string(),
+                state: ThinkingState::Finished { elapsed_secs: None },
+            }),
+        ];
+
+        let layout = compute_history(&app, 80);
+        let rows: Vec<_> = layout
+            .rows
+            .iter()
+            .map(|row| (row.text.as_str(), row.selectable))
+            .collect();
+
+        assert!(rows.contains(&("hello", true)));
+        assert!(rows.contains(&("world", true)));
+        assert!(
+            rows.iter()
+                .any(|(text, selectable)| text.contains("private reasoning") && !*selectable)
+        );
+        assert!(
+            rows.iter()
+                .any(|(text, selectable)| text.is_empty() && *selectable)
+        );
+    }
 }