feat: add session navigator

refs #157

18 files changed, 1739 insertions, 17 deletions

diff --git a/docs/next/CHANGELOG.md b/docs/next/CHANGELOG.md
index d7788f32..1fff74cf 100644
--- a/docs/next/CHANGELOG.md
+++ b/docs/next/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 ## Unreleased
 
+### Added
+- Added a session navigator at `prefix+g` with a searchable workspace/tab/pane tree, agent state filters, mouse switching, and keyboard navigation. (#157)
+
 ## [0.6.2] - 2026-05-23
 
 ### Added
diff --git a/docs/next/README.md b/docs/next/README.md
index cf99dc28..e82057d8 100644
--- a/docs/next/README.md
+++ b/docs/next/README.md
@@ -214,6 +214,7 @@ press `ctrl+b` to enter prefix mode. default actions are prefix-first and tmux-l
 | `prefix+n` / `prefix+p` | next / previous tab |
 | `prefix+1..9` | switch tab |
 | `prefix+w` | workspace navigation |
+| `prefix+g` | session navigator |
 | `prefix+shift+n` | new workspace |
 | `prefix+shift+g` | new worktree |
 | `prefix+shift+w` | rename workspace |
@@ -228,11 +229,13 @@ press `ctrl+b` to enter prefix mode. default actions are prefix-first and tmux-l
 
 resize mode: `h`/`l` resize width, `j`/`k` resize height, `esc` exit.
 
+session navigator opens a searchable workspace, tab, and pane tree. Use `/` for text search, `b`/`w`/`i`/`d` for blocked, working, idle, and done filters, `a` or Backspace to clear a state filter, and Enter to switch to the highlighted row.
+
 custom command keybindings can launch detached shell helpers or temporary panes:
 
 ```toml
 [[keys.command]]
-key = "prefix+g"
+key = "prefix+alt+g"
 type = "pane" # "shell" or "pane"
 command = "lazygit"
 ```
diff --git a/docs/next/website/src/content/docs/configuration.mdx b/docs/next/website/src/content/docs/configuration.mdx
index 87de1102..23debd45 100644
--- a/docs/next/website/src/content/docs/configuration.mdx
+++ b/docs/next/website/src/content/docs/configuration.mdx
@@ -91,6 +91,7 @@ A small keybinding override looks like this:
 ```toml
 [keys]
 prefix = "ctrl+b"
+goto = "prefix+g"
 new_tab = "prefix+c"
 next_tab = "prefix+n"
 previous_tab = "prefix+p"
@@ -104,6 +105,7 @@ The default keymap is prefix-first and avoids direct shortcuts that can steal in
 [keys]
 detach = "prefix+q"
 workspace_picker = "prefix+w"
+goto = "prefix+g"
 new_workspace = "prefix+shift+n"
 new_worktree = "prefix+shift+g"
 rename_workspace = "prefix+shift+w"
@@ -160,7 +162,7 @@ Custom commands use the same keybinding syntax.
 
 ```toml
 [[keys.command]]
-key = "prefix+g"
+key = "prefix+alt+g"
 type = "pane"
 command = "lazygit"
 ```
diff --git a/scripts/seed_navigator_demo.sh b/scripts/seed_navigator_demo.sh
new file mode 100755
index 00000000..9275e40a
--- /dev/null
+++ b/scripts/seed_navigator_demo.sh
@@ -0,0 +1,177 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+usage() {
+  cat <<'USAGE'
+usage: scripts/seed_navigator_demo.sh [--allow-main]
+
+Seeds a running herdr dev server with navigator demo workspaces, tabs, panes,
+and fake agent states. Most panes are intentionally unnamed.
+
+Environment:
+  HERDR_NAV_SOCKET_PATH  API socket to target. Defaults to $HOME/.config/herdr-dev/herdr.sock.
+  HERDR_NAV_CWD          Workspace cwd for created panes. Defaults to the repo root.
+USAGE
+}
+
+allow_main=0
+while (($#)); do
+  case "$1" in
+    --allow-main)
+      allow_main=1
+      shift
+      ;;
+    -h|--help)
+      usage
+      exit 0
+      ;;
+    *)
+      echo "unknown option: $1" >&2
+      usage >&2
+      exit 2
+      ;;
+  esac
+done
+
+script_dir="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
+repo_dir="$(cd -- "$script_dir/.." && pwd)"
+workspace_cwd="${HERDR_NAV_CWD:-$repo_dir}"
+config_home="${XDG_CONFIG_HOME:-$HOME/.config}"
+dev_socket="$config_home/herdr-dev/herdr.sock"
+main_socket="$config_home/herdr/herdr.sock"
+export HERDR_SOCKET_PATH="${HERDR_NAV_SOCKET_PATH:-$dev_socket}"
+
+if [[ "$allow_main" != 1 && "$HERDR_SOCKET_PATH" == "$main_socket" ]]; then
+  echo "refusing to seed main herdr session: $HERDR_SOCKET_PATH" >&2
+  echo "use HERDR_NAV_SOCKET_PATH for a dev socket, or pass --allow-main intentionally" >&2
+  exit 1
+fi
+
+if [[ ! -S "$HERDR_SOCKET_PATH" ]]; then
+  echo "herdr socket not found: $HERDR_SOCKET_PATH" >&2
+  echo "start a dev server first, or set HERDR_NAV_SOCKET_PATH" >&2
+  exit 1
+fi
+
+cd "$repo_dir"
+
+run() { cargo run --quiet -- "$@"; }
+
+mkws() {
+  local label="$1"
+  run workspace create --label "$label" --cwd "$workspace_cwd" --no-focus \
+    | jq -r '.result.workspace.workspace_id + " " + .result.root_pane.pane_id + " " + .result.tab.tab_id'
+}
+
+mktab() {
+  local ws="$1" label="$2"
+  run tab create --workspace "$ws" --label "$label" --cwd "$workspace_cwd" --no-focus \
+    | jq -r '.result.tab.tab_id + " " + .result.root_pane.pane_id'
+}
+
+split() {
+  local pane="$1" direction="$2"
+  run pane split "$pane" --direction "$direction" --no-focus \
+    | jq -r '.result.pane.pane_id'
+}
+
+rename_sparse() {
+  local pane="$1" label="$2"
+  run pane rename "$pane" "$label" >/dev/null
+}
+
+report() {
+  local pane="$1" agent="$2" state="$3" status="$4" seq="$5"
+  run pane report-agent "$pane" \
+    --source nav-seed \
+    --agent "$agent" \
+    --state "$state" \
+    --custom-status "$status" \
+    --seq "$seq" >/dev/null
+}
+
+stamp="$(date +%H%M%S)"
+done_panes=()
+
+read WS1 P1 T1 < <(mkws "nav-${stamp}-claude-review")
+P2="$(split "$P1" down)"
+P3="$(split "$P1" right)"
+rename_sparse "$P2" "approval needed"
+report "$P1" claude blocked blocked 1
+report "$P2" claude working working 1
+# P3 stays shell/unknown.
+
+read WS2 P4 T2 < <(mkws "nav-${stamp}-codex-build")
+P5="$(split "$P4" right)"
+read T2B P6 < <(mktab "$WS2" tests)
+P7="$(split "$P6" down)"
+report "$P4" codex working working 1
+report "$P5" codex working working 1
+report "$P6" codex idle idle 1
+report "$P7" codex working working 1
+done_panes+=("$P7:codex")
+
+read WS3 P8 T3 < <(mkws "nav-${stamp}-finished")
+P9="$(split "$P8" down)"
+P10="$(split "$P8" right)"
+rename_sparse "$P10" "release notes"
+report "$P8" claude working working 1
+report "$P9" claude working working 1
+report "$P10" codex idle idle 1
+done_panes+=("$P8:claude" "$P9:claude")
+
+read WS4 P11 T4 < <(mkws "nav-${stamp}-quiet")
+read T4B P12 < <(mktab "$WS4" notes)
+P13="$(split "$P12" right)"
+report "$P12" pi idle idle 1
+# P11 and P13 stay shell/unknown.
+
+read WS5 P14 T5 < <(mkws "nav-${stamp}-mixed")
+P15="$(split "$P14" down)"
+P16="$(split "$P14" right)"
+read T5B P17 < <(mktab "$WS5" agents)
+P18="$(split "$P17" down)"
+rename_sparse "$P14" "prod decision"
+report "$P14" claude blocked blocked 1
+report "$P15" codex blocked blocked 1
+report "$P16" claude working working 1
+report "$P17" codex working working 1
+report "$P18" claude idle idle 1
+
+read WS6 P19 T6 < <(mkws "nav-${stamp}-dense")
+P20="$(split "$P19" down)"
+P21="$(split "$P19" right)"
+read T6B P22 < <(mktab "$WS6" long-run)
+P23="$(split "$P22" down)"
+P24="$(split "$P22" right)"
+report "$P19" codex working working 1
+report "$P20" claude idle idle 1
+report "$P21" codex blocked blocked 1
+report "$P22" claude working working 1
+report "$P23" codex working working 1
+report "$P24" claude working working 1
+done_panes+=("$P24:claude")
+
+run workspace focus "$WS1" >/dev/null
+seq=2
+for item in "${done_panes[@]}"; do
+  pane="${item%%:*}"
+  agent="${item##*:}"
+  report "$pane" "$agent" idle done "$seq"
+  seq=$((seq + 1))
+done
+
+cat <<EOF
+Seeded navigator demo data via $HERDR_SOCKET_PATH
+
+Workspaces:
+  $WS1 nav-${stamp}-claude-review  claude blocked + claude working + shell
+  $WS2 nav-${stamp}-codex-build    codex working x2 + idle + done, tab $T2B
+  $WS3 nav-${stamp}-finished       claude done x2 + codex idle
+  $WS4 nav-${stamp}-quiet          shell x2 + pi idle, tab $T4B
+  $WS5 nav-${stamp}-mixed          blocked x2 + working x2 + idle, tab $T5B
+  $WS6 nav-${stamp}-dense          blocked + working x4 + idle + done, tab $T6B
+
+Sparse naming is intentional. Most panes have no manual names.
+Test in navigator: / then b, w, i, d, a, or normal text.
+EOF
diff --git a/src/app/actions.rs b/src/app/actions.rs
index ba71cc87..9132d7bd 100644
--- a/src/app/actions.rs
+++ b/src/app/actions.rs
@@ -9,7 +9,10 @@ use crate::layout::{find_in_direction, NavDirection, PaneId};
 use crate::terminal::{EffectiveStateChange, TerminalStateMutation};
 use crate::workspace::WorkspaceGitStatus;
 
-use super::state::{AppState, Mode, ToastKind, ToastNotification, ToastTarget, ViewLayout};
+use super::state::{
+    AppState, Mode, NavigatorRow, NavigatorStateFilter, NavigatorTarget, ToastKind,
+    ToastNotification, ToastTarget, ViewLayout,
+};
 
 fn is_background_completion_transition(prev_state: AgentState, new_state: AgentState) -> bool {
     matches!(new_state, AgentState::Idle)
@@ -95,6 +98,489 @@ pub struct PaneStateUpdate {
 }
 
 // ---------------------------------------------------------------------------
+// Navigator operations
+// ---------------------------------------------------------------------------
+
+impl AppState {
+    pub(crate) fn open_navigator(&mut self) {
+        self.navigator.query.clear();
+        self.navigator.search_focused = false;
+        self.navigator.state_filter = None;
+        self.navigator.scroll = 0;
+        self.navigator.expanded_workspaces.clear();
+
+        for ws in &self.workspaces {
+            self.navigator.expanded_workspaces.insert(ws.id.clone());
+        }
+
+        self.mode = Mode::Navigator;
+        self.navigator.selected = self.current_navigator_row_index().unwrap_or(0);
+        self.ensure_navigator_selection_visible();
+    }
+
+    pub(crate) fn navigator_rows(&self) -> Vec<NavigatorRow> {
+        let query = self.navigator.query.trim().to_lowercase();
+        let query_kind = navigator_query_kind(&query, self.navigator.state_filter);
+        let terminal_runtimes = crate::terminal::TerminalRuntimeRegistry::new();
+        let mut rows = Vec::new();
+        for (ws_idx, ws) in self.workspaces.iter().enumerate() {
+            let workspace_label = ws.display_name_from(&self.terminals, &terminal_runtimes);
+            let activity = workspace_activity_summary(ws, &self.terminals);
+            let workspace_search_text = format!("{workspace_label} {activity}").to_lowercase();
+            let workspace_matches = match query_kind {
+                NavigatorQueryKind::Empty => true,
+                NavigatorQueryKind::State(filter) => {
+                    let (state, seen) = ws.aggregate_state(&self.terminals);
+                    navigator_state_filter_matches(filter, state, seen)
+                }
+                NavigatorQueryKind::Text => navigator_matches(&query, &workspace_search_text),
+            };
+
+            let child_rows = self.navigator_child_rows(ws_idx, query_kind, &query);
+            if !workspace_matches && child_rows.is_empty() {
+                continue;
+            }
+
+            let expanded = !matches!(query_kind, NavigatorQueryKind::Empty)
+                || self.navigator.expanded_workspaces.contains(&ws.id);
+            let (state, seen) = ws.aggregate_state(&self.terminals);
+            let pane_count = ws.tabs.iter().map(|tab| tab.panes.len()).sum::<usize>();
+            rows.push(NavigatorRow {
+                target: NavigatorTarget::Workspace { ws_idx },
+                depth: 0,
+                label: format!("{workspace_label} ({pane_count})"),
+                meta: activity,
+                status: state,
+                seen,
+                is_current: self.active == Some(ws_idx),
+                is_workspace: true,
+                is_tab: false,
+                expanded,
+                search_text: workspace_search_text,
+            });
+            if expanded {
+                rows.extend(child_rows);
+            }
+        }
+        rows
+    }
+
+    fn navigator_child_rows(
+        &self,
+        ws_idx: usize,
+        query_kind: NavigatorQueryKind,
+        query: &str,
+    ) -> Vec<NavigatorRow> {
+        let Some(ws) = self.workspaces.get(ws_idx) else {
+            return Vec::new();
+        };
+        let multi_tab = ws.tabs.len() > 1;
+        let mut rows = Vec::new();
+        for tab_idx in 0..ws.tabs.len() {
+            let tab_row = multi_tab.then(|| self.navigator_tab_row(ws_idx, tab_idx));
+            let tab_matches = tab_row.as_ref().is_some_and(|row| match query_kind {
+                NavigatorQueryKind::Empty => true,
+                NavigatorQueryKind::State(filter) => {
+                    navigator_state_filter_matches(filter, row.status, row.seen)
+                }
+                NavigatorQueryKind::Text => navigator_matches(query, &row.search_text),
+            });
+            let pane_rows = self.navigator_pane_rows_for_tab(ws_idx, tab_idx, multi_tab);
+            let filtered_panes = match query_kind {
+                NavigatorQueryKind::Empty => pane_rows,
+                NavigatorQueryKind::State(filter) => pane_rows
+                    .into_iter()
+                    .filter(|row| navigator_state_filter_matches(filter, row.status, row.seen))
+                    .collect::<Vec<_>>(),
+                NavigatorQueryKind::Text if tab_matches => pane_rows,
+                NavigatorQueryKind::Text => pane_rows
+                    .into_iter()
+                    .filter(|row| navigator_matches(query, &row.search_text))
+                    .collect::<Vec<_>>(),
+            };
+
+            if let Some(tab_row) = tab_row {
+                if tab_matches || !filtered_panes.is_empty() {
+                    rows.push(tab_row);
+                }
+            }
+            rows.extend(filtered_panes);
+        }
+        rows
+    }
+
+    fn navigator_tab_row(&self, ws_idx: usize, tab_idx: usize) -> NavigatorRow {
+        let ws = &self.workspaces[ws_idx];
+        let tab = &ws.tabs[tab_idx];
+        let label = tab.display_name();
+        let (status, seen) = tab_aggregate_state(tab, &self.terminals);
+        let activity = tab_activity_summary(tab, &self.terminals);
+        let pane_count = tab.panes.len();
+        let meta = if activity.is_empty() {
+            format!("{pane_count} panes")
+        } else {
+            format!("{pane_count} panes · {activity}")
+        };
+        let search_text = format!("{label} {meta}").to_lowercase();
+        NavigatorRow {
+            target: NavigatorTarget::Tab { ws_idx, tab_idx },
+            depth: 1,
+            label,
+            meta,
+            status,
+            seen,
+            is_current: false,
+            is_workspace: false,
+            is_tab: true,
+            expanded: true,
+            search_text,
+        }
+    }
+
+    fn navigator_pane_rows_for_tab(
+        &self,
+        ws_idx: usize,
+        tab_idx: usize,
+        multi_tab: bool,
+    ) -> Vec<NavigatorRow> {
+        let Some(ws) = self.workspaces.get(ws_idx) else {
+            return Vec::new();
+        };
+        let Some(tab) = ws.tabs.get(tab_idx) else {
+            return Vec::new();
+        };
+        let mut rows = Vec::new();
+        for pane_id in tab.layout.pane_ids() {
+            let Some(pane) = tab.panes.get(&pane_id) else {
+                continue;
+            };
+            let terminal = self.terminals.get(&pane.attached_terminal_id);
+            let pane_number = ws.public_pane_number(pane_id).unwrap_or(0);
+            let label = terminal
+                .and_then(|terminal| terminal.manual_label.as_deref())
+                .or_else(|| terminal.and_then(|terminal| terminal.agent_name.as_deref()))
+                .or_else(|| terminal.and_then(|terminal| terminal.effective_agent_label()))
+                .map(str::to_string)
+                .or_else(|| {
+                    launch_label(terminal.and_then(|terminal| terminal.launch_argv.as_ref()))
+                })
+                .unwrap_or_else(|| format!("pane {pane_number}"));
+            let agent_label = terminal
+                .and_then(|terminal| terminal.agent_name.as_deref())
+                .or_else(|| terminal.and_then(|terminal| terminal.effective_agent_label()));
+            let custom_status = terminal.and_then(|terminal| terminal.effective_custom_status());
+            let state = terminal
+                .map(|terminal| terminal.state)
+                .unwrap_or(AgentState::Unknown);
+            let status = custom_status
+                .map(str::to_string)
+                .or_else(|| agent_label.map(|_| state_label_text(state, pane.seen).to_string()));
+            let meta = match (agent_label, status.as_deref()) {
+                (Some(agent_label), Some(status)) => format!("{agent_label} · {status}"),
+                (Some(agent_label), None) => agent_label.to_string(),
+                (None, _) => "shell".to_string(),
+            };
+            let is_current = self.is_active_pane(ws_idx, tab_idx, pane_id);
+            let search_text = format!("{label} {meta}").to_lowercase();
+            rows.push(NavigatorRow {
+                target: NavigatorTarget::Pane {
+                    ws_idx,
+                    tab_idx,
+                    pane_id,
+                },
+                depth: if multi_tab { 2 } else { 1 },
+                label,
+                meta,
+                status: state,
+                seen: pane.seen,
+                is_current,
+                is_workspace: false,
+                is_tab: false,
+                expanded: false,
+                search_text,
+            });
+        }
+        rows
+    }
+
+    fn current_navigator_row_index(&self) -> Option<usize> {
+        let rows = self.navigator_rows();
+        rows.iter()
+            .position(|row| matches!(row.target, NavigatorTarget::Pane { .. }) && row.is_current)
+            .or_else(|| rows.iter().position(|row| row.is_current))
+    }
+
+    pub(crate) fn ensure_navigator_selection_visible(&mut self) {
+        let body = self.navigator_body_rect();
+        let viewport = body.height as usize;
+        if viewport == 0 {
+            self.navigator.scroll = 0;
+            return;
+        }
+        let max_scroll = self.navigator_max_scroll(viewport);
+        if self.navigator.selected < self.navigator.scroll {
+            self.navigator.scroll = self.navigator.selected;
+        } else if self.navigator.selected >= self.navigator.scroll.saturating_add(viewport) {
+            self.navigator.scroll = self
+                .navigator
+                .selected
+                .saturating_add(1)
+                .saturating_sub(viewport);
+        }
+        self.navigator.scroll = self.navigator.scroll.min(max_scroll);
+    }
+
+    pub(crate) fn navigator_max_scroll(&self, viewport: usize) -> usize {
+        if viewport == 0 {
+            return 0;
+        }
+        self.navigator_rows().len().saturating_sub(viewport)
+    }
+
+    pub(crate) fn move_navigator_selection(&mut self, delta: isize) {
+        let count = self.navigator_rows().len();
+        if count == 0 {
+            self.navigator.selected = 0;
+            self.navigator.scroll = 0;
+            return;
+        }
+        let current = self.navigator.selected.min(count - 1) as isize;
+        self.navigator.selected = (current + delta).clamp(0, count as isize - 1) as usize;
+        self.ensure_navigator_selection_visible();
+    }
+
+    pub(crate) fn clamp_navigator_selection(&mut self) {
+        let count = self.navigator_rows().len();
+        self.navigator.selected = self.navigator.selected.min(count.saturating_sub(1));
+        self.ensure_navigator_selection_visible();
+    }
+
+    pub(crate) fn toggle_selected_navigator_workspace(&mut self) {
+        let Some(row) = self.navigator_rows().get(self.navigator.selected).cloned() else {
+            return;
+        };
+        let NavigatorTarget::Workspace { ws_idx } = row.target else {
+            return;
+        };
+        let Some(workspace_id) = self.workspaces.get(ws_idx).map(|ws| ws.id.clone()) else {
+            return;
+        };
+        if self.navigator.expanded_workspaces.contains(&workspace_id) {
+            self.navigator.expanded_workspaces.remove(&workspace_id);
+        } else {
+            self.navigator.expanded_workspaces.insert(workspace_id);
+        }
+        self.clamp_navigator_selection();
+    }
+
+    pub(crate) fn accept_navigator_selection(&mut self) -> bool {
+        let Some(row) = self.navigator_rows().get(self.navigator.selected).cloned() else {
+            return false;
+        };
+        self.focus_navigator_target(row.target)
+    }
+
+    pub(crate) fn focus_navigator_target(&mut self, target: NavigatorTarget) -> bool {
+        match target {
+            NavigatorTarget::Workspace { ws_idx } => {
+                if ws_idx >= self.workspaces.len() {
+                    return false;
+                }
+                self.switch_workspace(ws_idx);
+                self.mode = Mode::Terminal;
+                true
+            }
+            NavigatorTarget::Tab { ws_idx, tab_idx } => {
+                if ws_idx >= self.workspaces.len() {
+                    return false;
+                }
+                let tab_exists = self
+                    .workspaces
+                    .get(ws_idx)
+                    .is_some_and(|ws| tab_idx < ws.tabs.len());
+                if !tab_exists {
+                    return false;
+                }
+                self.switch_workspace(ws_idx);
+                self.switch_tab(tab_idx);
+                self.mode = Mode::Terminal;
+                true
+            }
+            NavigatorTarget::Pane {
+                ws_idx,
+                tab_idx,
+                pane_id,
+            } => {
+                if ws_idx >= self.workspaces.len() {
+                    return false;
+                }
+                self.switch_workspace(ws_idx);
+                self.switch_tab(tab_idx);
+                if let Some(tab) = self
+                    .workspaces
+                    .get_mut(ws_idx)
+                    .and_then(|ws| ws.tabs.get_mut(tab_idx))
+                {
+                    if tab.panes.contains_key(&pane_id) {
+                        tab.layout.focus_pane(pane_id);
+                        self.mark_session_dirty();
+                        self.mode = Mode::Terminal;
+                        return true;
+                    }
+                }
+                false
+            }
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+enum NavigatorQueryKind {
+    Empty,
+    Text,
+    State(NavigatorStateFilter),
+}
+
+fn navigator_query_kind(
+    query: &str,
+    state_filter: Option<NavigatorStateFilter>,
+) -> NavigatorQueryKind {
+    if let Some(filter) = state_filter {
+        return NavigatorQueryKind::State(filter);
+    }
+    if query.is_empty() {
+        NavigatorQueryKind::Empty
+    } else {
+        NavigatorQueryKind::Text
+    }
+}
+
+fn navigator_state_filter_matches(
+    filter: NavigatorStateFilter,
+    state: AgentState,
+    seen: bool,
+) -> bool {
+    match filter {
+        NavigatorStateFilter::Blocked => state == AgentState::Blocked,
+        NavigatorStateFilter::Working => state == AgentState::Working,
+        NavigatorStateFilter::Idle => state == AgentState::Idle && seen,
+        NavigatorStateFilter::Done => state == AgentState::Idle && !seen,
+    }
+}
+
+fn navigator_matches(query: &str, text: &str) -> bool {
+    query
+        .split_whitespace()
+        .all(|part| text.contains(&part.to_lowercase()))
+}
+
+fn launch_label(argv: Option<&Vec<String>>) -> Option<String> {
+    let argv = argv?;
+    let command = argv.first()?;
+    std::path::Path::new(command)
+        .file_name()
+        .and_then(|name| name.to_str())
+        .map(str::to_string)
+        .or_else(|| Some(command.clone()))
+}
+
+fn state_label_text(state: AgentState, seen: bool) -> &'static str {
+    match (state, seen) {
+        (AgentState::Blocked, _) => "blocked",
+        (AgentState::Working, _) => "working",
+        (AgentState::Idle, false) => "done",
+        (AgentState::Idle, true) => "idle",
+        (AgentState::Unknown, _) => "unknown",
+    }
+}
+
+fn tab_aggregate_state(
+    tab: &crate::workspace::Tab,
+    terminals: &std::collections::HashMap<
+        crate::terminal::TerminalId,
+        crate::terminal::TerminalState,
+    >,
+) -> (AgentState, bool) {
+    let mut aggregate = AgentState::Unknown;
+    let mut seen = true;
+    for pane in tab.panes.values() {
+        let Some(terminal) = terminals.get(&pane.attached_terminal_id) else {
+            continue;
+        };
+        if state_priority(terminal.state, pane.seen) > state_priority(aggregate, seen) {
+            aggregate = terminal.state;
+            seen = pane.seen;
+        }
+    }
+    (aggregate, seen)
+}
+
+fn state_priority(state: AgentState, seen: bool) -> u8 {
+    match (state, seen) {
+        (AgentState::Blocked, _) => 5,
+        (AgentState::Working, _) => 4,
+        (AgentState::Idle, false) => 3,
+        (AgentState::Idle, true) => 2,
+        (AgentState::Unknown, _) => 1,
+    }
+}
+
+fn tab_activity_summary(
+    tab: &crate::workspace::Tab,
+    terminals: &std::collections::HashMap<
+        crate::terminal::TerminalId,
+        crate::terminal::TerminalState,
+    >,
+) -> String {
+    activity_summary_for_panes(tab.panes.values(), terminals)
+}
+
+fn workspace_activity_summary(
+    ws: &crate::workspace::Workspace,
+    terminals: &std::collections::HashMap<
+        crate::terminal::TerminalId,
+        crate::terminal::TerminalState,
+    >,
+) -> String {
+    activity_summary_for_panes(ws.tabs.iter().flat_map(|tab| tab.panes.values()), terminals)
+}
+
+fn activity_summary_for_panes<'a>(
+    panes: impl Iterator<Item = &'a crate::pane::PaneState>,
+    terminals: &std::collections::HashMap<
+        crate::terminal::TerminalId,
+        crate::terminal::TerminalState,
+    >,
+) -> String {
+    let mut blocked = 0usize;
+    let mut working = 0usize;
+    let mut done = 0usize;
+    for pane in panes {
+        let Some(terminal) = terminals.get(&pane.attached_terminal_id) else {
+            continue;
+        };
+        match (terminal.state, pane.seen) {
+            (AgentState::Blocked, _) => blocked += 1,
+            (AgentState::Working, _) => working += 1,
+            (AgentState::Idle, false) => done += 1,
+            _ => {}
+        }
+    }
+
+    let mut parts = Vec::new();
+    if blocked > 0 {
+        parts.push(format!("{blocked} blocked"));
+    }
+    if working > 0 {
+        parts.push(format!("{working} working"));
+    }
+    if done > 0 {
+        parts.push(format!("{done} done"));
+    }
+    parts.join(" · ")
+}
+
+// ---------------------------------------------------------------------------
 // Workspace operations
 // ---------------------------------------------------------------------------
 
@@ -1140,6 +1626,221 @@ mod tests {
     }
 
     #[test]
+    fn navigator_rows_show_tab_nodes_only_for_multi_tab_workspaces() {
+        let mut state = app_with_workspaces(&["single", "multi"]);
+        state.workspaces[1].test_add_tab(Some("tests"));
+        state.ensure_test_terminals();
+
+        state.open_navigator();
+        let rows = state.navigator_rows();
+
+        assert!(!rows.iter().any(|row| matches!(
+            row.target,
+            crate::app::state::NavigatorTarget::Tab { ws_idx: 0, .. }
+        )));
+        assert!(rows.iter().any(|row| matches!(
+            row.target,
+            crate::app::state::NavigatorTarget::Tab {
+                ws_idx: 1,
+                tab_idx: 0
+            }
+        )));
+        assert!(rows.iter().any(|row| matches!(
+            row.target,
+            crate::app::state::NavigatorTarget::Tab {
+                ws_idx: 1,
+                tab_idx: 1
+            }
+        )));
+    }
+
+    #[test]
+    fn navigator_rows_include_shell_and_agent_panes() {
+        let mut state = app_with_workspaces(&["one"]);
+        let shell = state.workspaces[0].tabs[0].root_pane;
+        let agent = state.workspaces[0].test_split(Direction::Horizontal);
+        state.ensure_test_terminals();
+
+        let agent_terminal_id = state.workspaces[0].terminal_id(agent).cloned().unwrap();
+        let terminal = state.terminals.get_mut(&agent_terminal_id).unwrap();
+        terminal.set_detected_state(Some(Agent::Claude), AgentState::Working);
+
+        state.open_navigator();
+        let rows = state.navigator_rows();
+
+        assert!(rows.iter().any(|row| matches!(
+            row.target,
+            crate::app::state::NavigatorTarget::Pane { pane_id, .. } if pane_id == shell
+        )));
+        assert!(rows.iter().any(|row| matches!(
+            row.target,
+            crate::app::state::NavigatorTarget::Pane { pane_id, .. } if pane_id == agent
+        ) && row.meta.contains("claude")));
+    }
+
+    #[test]
+    fn opening_navigator_selects_current_pane_and_expands_attention_workspaces() {
+        let mut state = app_with_workspaces(&["one", "two"]);
+        let blocked = state.workspaces[1].tabs[0].root_pane;
+        let blocked_terminal_id = state.workspaces[1].terminal_id(blocked).cloned().unwrap();
+        state
+            .terminals
+            .get_mut(&blocked_terminal_id)
+            .unwrap()
+            .set_detected_state(Some(Agent::Codex), AgentState::Blocked);
+
+        state.open_navigator();
+        let selected = state.navigator_rows()[state.navigator.selected].clone();
+
+        assert!(selected.is_current);
+        assert!(state
+            .navigator
+            .expanded_workspaces
+            .contains(&state.workspaces[0].id));
+        assert!(state
+            .navigator
+            .expanded_workspaces
+            .contains(&state.workspaces[1].id));
+    }
+
+    #[test]
+    fn accepting_navigator_pane_switches_workspace_tab_and_focus() {
+        let mut state = app_with_workspaces(&["one", "two"]);
+        let target = state.workspaces[1].tabs[0].root_pane;
+        state.open_navigator();
+        state
+            .navigator
+            .expanded_workspaces
+            .insert(state.workspaces[1].id.clone());
+        state.navigator.selected = state
+            .navigator_rows()
+            .iter()
+            .position(|row| {
+                matches!(
+                    row.target,
+                    crate::app::state::NavigatorTarget::Pane { pane_id, .. } if pane_id == target
+                )
+            })
+            .unwrap();
+
+        assert!(state.accept_navigator_selection());
+
+        assert_eq!(state.active, Some(1));
+        assert_eq!(state.workspaces[1].focused_pane_id(), Some(target));
+        assert_eq!(state.mode, Mode::Terminal);
+    }
+
+    #[test]
+    fn navigator_idle_search_matches_idle_agents_not_plain_shells() {
+        let mut state = app_with_workspaces(&["one"]);
+        let shell = state.workspaces[0].tabs[0].root_pane;
+        let agent = state.workspaces[0].test_split(Direction::Horizontal);
+        state.ensure_test_terminals();
+
+        let agent_terminal_id = state.workspaces[0].terminal_id(agent).cloned().unwrap();
+        state
+            .terminals
+            .get_mut(&agent_terminal_id)
+            .unwrap()
+            .set_detected_state(Some(Agent::Claude), AgentState::Idle);
+
+        state.open_navigator();
+        state.navigator.query = "idle".into();
+        let rows = state.navigator_rows();
+
+        assert!(rows.iter().any(|row| matches!(
+            row.target,
+            crate::app::state::NavigatorTarget::Pane { pane_id, .. } if pane_id == agent
+        )));
+        assert!(!rows.iter().any(|row| matches!(
+            row.target,
+            crate::app::state::NavigatorTarget::Pane { pane_id, .. } if pane_id == shell
+        )));
+    }
+
+    #[test]
+    fn navigator_search_only_matches_visible_row_text() {
+        let mut state = app_with_workspaces(&["one"]);
+        state.workspaces[0].identity_cwd = "/tmp/herdr-worktrees/issue-work".into();
+
+        state.open_navigator();
+        state.navigator.query = "work".into();
+
+        assert!(state.navigator_rows().is_empty());
+    }
+
+    #[test]
+    fn navigator_state_filter_is_separate_from_text_search() {
+        let mut state = app_with_workspaces(&["one"]);
+        let shell = state.workspaces[0].tabs[0].root_pane;
+        let working = state.workspaces[0].test_split(Direction::Horizontal);
+        state.ensure_test_terminals();
+
+        let shell_terminal_id = state.workspaces[0].terminal_id(shell).cloned().unwrap();
+        state
+            .terminals
+            .get_mut(&shell_terminal_id)
+            .unwrap()
+            .set_manual_label("wheel notes".into());
+        let working_terminal_id = state.workspaces[0].terminal_id(working).cloned().unwrap();
+        state
+            .terminals
+            .get_mut(&working_terminal_id)
+            .unwrap()
+            .set_detected_state(Some(Agent::Codex), AgentState::Working);
+
+        state.open_navigator();
+        state.navigator.state_filter = Some(NavigatorStateFilter::Working);
+        let state_rows = state.navigator_rows();
+
+        assert!(state_rows.iter().any(|row| matches!(
+            row.target,
+            crate::app::state::NavigatorTarget::Pane { pane_id, .. } if pane_id == working
+        )));
+        assert!(!state_rows.iter().any(|row| matches!(
+            row.target,
+            crate::app::state::NavigatorTarget::Pane { pane_id, .. } if pane_id == shell
+        )));
+
+        state.navigator.state_filter = None;
+        state.navigator.query = "w".into();
+        let text_rows = state.navigator_rows();
+
+        assert!(text_rows.iter().any(|row| matches!(
+            row.target,
+            crate::app::state::NavigatorTarget::Pane { pane_id, .. } if pane_id == shell
+        )));
+        assert!(
+            text_rows.iter().any(|row| matches!(
+                row.target,
+                crate::app::state::NavigatorTarget::Pane { pane_id, .. } if pane_id == working
+            )),
+            "literal one-letter search may still match visible state text"
+        );
+    }
+
+    #[test]
+    fn navigator_search_filters_panes_but_keeps_workspace_context() {
+        let mut state = app_with_workspaces(&["one"]);
+        let root = state.workspaces[0].tabs[0].root_pane;
+        let terminal_id = state.workspaces[0].terminal_id(root).cloned().unwrap();
+        state
+            .terminals
+            .get_mut(&terminal_id)
+            .unwrap()
+            .set_manual_label("weekly review".into());
+        state.open_navigator();
+        state.navigator.query = "weekly".into();
+
+        let rows = state.navigator_rows();
+
+        assert!(rows.iter().any(|row| row.is_workspace));
+        assert!(rows
+            .iter()
+            .any(|row| !row.is_workspace && row.label.contains("weekly")));
+    }
+
+    #[test]
     fn apply_workspace_git_statuses_updates_matching_workspace() {
         let mut state = app_with_workspaces(&["one", "two"]);
         let first_id = state.workspaces[0].id.clone();
diff --git a/src/app/input/mod.rs b/src/app/input/mod.rs
index ef8b93f3..44491631 100644
--- a/src/app/input/mod.rs
+++ b/src/app/input/mod.rs
@@ -34,7 +34,7 @@ mod terminal;
 pub(crate) use self::{
     modal::{
         handle_confirm_close_key, handle_context_menu_key, handle_global_menu_key,
-        handle_keybind_help_key, handle_rename_key, handle_resize_key,
+        handle_keybind_help_key, handle_navigator_key, handle_rename_key, handle_resize_key,
     },
     navigate::terminal_direct_navigation_action,
     settings::open_settings_at,
@@ -83,6 +83,7 @@ impl App {
                     Mode::Settings => self.handle_settings_key(key_event),
                     Mode::GlobalMenu => handle_global_menu_key(&mut self.state, key_event),
                     Mode::KeybindHelp => handle_keybind_help_key(&mut self.state, key_event),
+                    Mode::Navigator => handle_navigator_key(&mut self.state, key_event),
                     Mode::Terminal => unreachable!(),
                 }
             }
diff --git a/src/app/input/modal.rs b/src/app/input/modal.rs
index acd481b8..6821e64a 100644
--- a/src/app/input/modal.rs
+++ b/src/app/input/modal.rs
@@ -2,7 +2,9 @@ use crossterm::event::{KeyCode, KeyEvent, KeyModifiers};
 use ratatui::layout::{Direction, Rect};
 
 use crate::{
-    app::state::{AppState, ContextMenuKind, ContextMenuState, MenuListState, Mode},
+    app::state::{
+        AppState, ContextMenuKind, ContextMenuState, MenuListState, Mode, NavigatorStateFilter,
+    },
     input::TerminalKey,
     layout::NavDirection,
 };
@@ -150,6 +152,121 @@ pub(crate) fn handle_global_menu_key(state: &mut AppState, key: KeyEvent) {
     }
 }
 
+pub(crate) fn handle_navigator_key(state: &mut AppState, key: KeyEvent) {
+    if state.navigator.search_focused {
+        match key.code {
+            KeyCode::Esc => {
+                if state.navigator.query.is_empty() {
+                    state.navigator.search_focused = false;
+                    leave_modal(state);
+                } else {
+                    state.navigator.query.clear();
+                    state.navigator.state_filter = None;
+                    state.navigator.search_focused = false;
+                    state.clamp_navigator_selection();
+                }
+            }
+            KeyCode::Enter => {
+                state.accept_navigator_selection();
+            }
+            KeyCode::Backspace => {
+                state.navigator.state_filter = None;
+                state.navigator.query.pop();
+                state.clamp_navigator_selection();
+            }
+            KeyCode::Up => state.move_navigator_selection(-1),
+            KeyCode::Down => state.move_navigator_selection(1),
+            KeyCode::Char('n') if key.modifiers == KeyModifiers::CONTROL => {
+                state.move_navigator_selection(1)
+            }
+            KeyCode::Char('p') if key.modifiers == KeyModifiers::CONTROL => {
+                state.move_navigator_selection(-1)
+            }
+            KeyCode::Char('u') if key.modifiers == KeyModifiers::CONTROL => {
+                state.navigator.query.clear();
+                state.navigator.state_filter = None;
+                state.clamp_navigator_selection();
+            }
+            KeyCode::Char(c)
+                if key.modifiers.is_empty() || key.modifiers == KeyModifiers::SHIFT =>
+            {
+                state.navigator.state_filter = None;
+                state.navigator.query.push(c);
+                state.clamp_navigator_selection();
+            }
+            _ => {}
+        }
+        return;
+    }
+
+    match key.code {
+        KeyCode::Esc => {
+            if state.navigator.query.is_empty() && state.navigator.state_filter.is_none() {
+                leave_modal(state);
+            } else {
+                state.navigator.query.clear();
+                state.navigator.state_filter = None;
+                state.clamp_navigator_selection();
+            }
+        }
+        KeyCode::Enter => {
+            state.accept_navigator_selection();
+        }
+        KeyCode::Char('/') => {
+            state.navigator.query.clear();
+            state.navigator.state_filter = None;
+            state.navigator.search_focused = true;
+            state.clamp_navigator_selection();
+        }
+        KeyCode::Backspace if state.navigator.state_filter.is_some() => {
+            state.navigator.state_filter = None;
+            state.clamp_navigator_selection();
+        }
+        KeyCode::Char('a') if key.modifiers.is_empty() => {
+            state.navigator.query.clear();
+            state.navigator.state_filter = None;
+            state.clamp_navigator_selection();
+        }
+        KeyCode::Char('b') if key.modifiers.is_empty() => {
+            state.navigator.query.clear();
+            state.navigator.state_filter = Some(NavigatorStateFilter::Blocked);
+            state.clamp_navigator_selection();
+        }
+        KeyCode::Char('w') if key.modifiers.is_empty() => {
+            state.navigator.query.clear();
+            state.navigator.state_filter = Some(NavigatorStateFilter::Working);
+            state.clamp_navigator_selection();
+        }
+        KeyCode::Char('i') if key.modifiers.is_empty() => {
+            state.navigator.query.clear();
+            state.navigator.state_filter = Some(NavigatorStateFilter::Idle);
+            state.clamp_navigator_selection();
+        }
+        KeyCode::Char('d') if key.modifiers.is_empty() => {
+            state.navigator.query.clear();
+            state.navigator.state_filter = Some(NavigatorStateFilter::Done);
+            state.clamp_navigator_selection();
+        }
+        KeyCode::Char('j') | KeyCode::Down => state.move_navigator_selection(1),
+        KeyCode::Char('k') | KeyCode::Up => state.move_navigator_selection(-1),
+        KeyCode::Char('d') if key.modifiers == KeyModifiers::CONTROL => {
+            state.move_navigator_selection((state.navigator_body_rect().height / 2).max(1) as isize)
+        }
+        KeyCode::Char('u') if key.modifiers == KeyModifiers::CONTROL => state
+            .move_navigator_selection(-((state.navigator_body_rect().height / 2).max(1) as isize)),
+        KeyCode::Char(' ') => state.toggle_selected_navigator_workspace(),
+        KeyCode::Home => {
+            state.navigator.selected = 0;
+            state.ensure_navigator_selection_visible();
+        }
+        KeyCode::End | KeyCode::Char('G') => {
+            state.navigator.selected = state.navigator_rows().len().saturating_sub(1);
+            state.ensure_navigator_selection_visible();
+        }
+        _ => {}
+    }
+}
+
 pub(crate) fn handle_keybind_help_key(state: &mut AppState, key: KeyEvent) {
     match key.code {
         KeyCode::Up | KeyCode::Char('k') => state.scroll_keybind_help(-1),
diff --git a/src/app/input/navigate.rs b/src/app/input/navigate.rs
index da3d49bf..4e8a50b3 100644
--- a/src/app/input/navigate.rs
+++ b/src/app/input/navigate.rs
@@ -490,6 +490,7 @@ pub(crate) enum NavigateAction {
     ReloadConfig,
     OpenNotificationTarget,
     Detach,
+    OpenNavigator,
 }
 
 fn indexed_navigation_action(
@@ -588,6 +589,7 @@ fn action_for_key(
             NavigateAction::OpenNotificationTarget,
         ),
         (&kb.detach, NavigateAction::Detach),
+        (&kb.goto, NavigateAction::OpenNavigator),
     ] {
         if action_matches(bindings, key, dispatch) {
             return Some(action);
@@ -780,6 +782,7 @@ pub(super) fn execute_navigate_action_in_context(
             super::modal::request_detach(state);
             leave_navigate_mode(state);
         }
+        NavigateAction::OpenNavigator => state.open_navigator(),
     }
 
     finish_action_context(state, context, previous_mode);
@@ -930,6 +933,18 @@ mod tests {
     }
 
     #[test]
+    fn default_goto_key_opens_navigator() {
+        let mut state = state_with_workspaces(&["test"]);
+
+        handle_navigate_key(
+            &mut state,
+            KeyEvent::new(KeyCode::Char('g'), KeyModifiers::empty()),
+        );
+
+        assert_eq!(state.mode, Mode::Navigator);
+    }
+
+    #[test]
     fn custom_rename_key_enters_rename_mode() {
         let mut state = state_with_workspaces(&["test"]);
         state.keybinds.rename_workspace = crate::config::ActionKeybinds::prefix("g");
@@ -1502,8 +1517,8 @@ mod tests {
             output_path.display()
         );
         app.state.keybinds.custom_commands = vec![crate::config::CustomCommandKeybind {
-            bindings: crate::config::ActionKeybinds::prefix("g"),
-            label: "prefix+g".into(),
+            bindings: crate::config::ActionKeybinds::prefix("m"),
+            label: "prefix+m".into(),
             command,
             action: crate::config::CustomCommandAction::Shell,
         }];
@@ -1515,7 +1530,7 @@ mod tests {
         .await;
         assert_eq!(app.state.mode, Mode::Prefix);
 
-        app.handle_key(TerminalKey::new(KeyCode::Char('g'), KeyModifiers::empty()))
+        app.handle_key(TerminalKey::new(KeyCode::Char('m'), KeyModifiers::empty()))
             .await;
 
         let content = wait_for_file(&output_path);
@@ -1561,8 +1576,8 @@ mod tests {
         let output_path = unique_temp_path("custom-pane-command");
         let command = format!("printf done > '{}'", output_path.display());
         app.state.keybinds.custom_commands = vec![crate::config::CustomCommandKeybind {
-            bindings: crate::config::ActionKeybinds::prefix("g"),
-            label: "prefix+g".into(),
+            bindings: crate::config::ActionKeybinds::prefix("m"),
+            label: "prefix+m".into(),
             command,
             action: crate::config::CustomCommandAction::Pane,
         }];
@@ -1572,7 +1587,7 @@ mod tests {
             app.state.prefix_mods,
         ))
         .await;
-        app.handle_key(TerminalKey::new(KeyCode::Char('g'), KeyModifiers::empty()))
+        app.handle_key(TerminalKey::new(KeyCode::Char('m'), KeyModifiers::empty()))
             .await;
 
         assert_eq!(app.state.workspaces[0].tabs[0].layout.pane_count(), 2);
diff --git a/src/app/input/overlays.rs b/src/app/input/overlays.rs
index 365de6b6..7d2a8ff3 100644
--- a/src/app/input/overlays.rs
+++ b/src/app/input/overlays.rs
@@ -5,7 +5,7 @@ use ratatui::{
 };
 
 use crate::app::{
-    state::{AppState, DragState, DragTarget, Mode},
+    state::{AppState, DragState, DragTarget, Mode, NavigatorTarget},
     App,
 };
 
@@ -14,6 +14,10 @@ use super::{
     ScrollbarClickTarget,
 };
 
+fn rect_contains(rect: Rect, col: u16, row: u16) -> bool {
+    col >= rect.x && col < rect.x + rect.width && row >= rect.y && row < rect.y + rect.height
+}
+
 impl App {
     pub(super) fn handle_overlay_mouse(&mut self, mouse: MouseEvent) -> bool {
         if self.state.mode == Mode::ReleaseNotes {
@@ -119,6 +123,60 @@ impl App {
             return true;
         }
 
+        if self.state.mode == Mode::Navigator {
+            match mouse.kind {
+                MouseEventKind::Moved => {
+                    if let Some(idx) = self.state.navigator_row_index_at(mouse.column, mouse.row) {
+                        self.state.navigator.selected = idx;
+                        self.state.ensure_navigator_selection_visible();
+                    }
+                }
+                MouseEventKind::Down(MouseButton::Left) => {
+                    if self
+                        .state
+                        .navigator_search_contains(mouse.column, mouse.row)
+                    {
+                        self.state.navigator.search_focused = true;
+                    } else if let Some(idx) =
+                        self.state.navigator_row_index_at(mouse.column, mouse.row)
+                    {
+                        self.state.navigator.selected = idx;
+                        let target = self
+                            .state
+                            .navigator_rows()
+                            .get(idx)
+                            .map(|row| (row.target.clone(), row.is_workspace));
+                        if let Some((NavigatorTarget::Workspace { .. }, true)) = target {
+                            if self.state.navigator_row_caret_at(mouse.column) {
+                                self.state.toggle_selected_navigator_workspace();
+                            } else {
+                                self.state.accept_navigator_selection();
+                            }
+                        } else {
+                            self.state.accept_navigator_selection();
+                        }
+                    } else if !self.state.navigator_popup_contains(mouse.column, mouse.row) {
+                        leave_modal(&mut self.state);
+                    }
+                }
+                MouseEventKind::ScrollUp => {
+                    self.state.navigator.scroll = self.state.navigator.scroll.saturating_sub(3);
+                    self.state.navigator.selected = self.state.navigator.scroll;
+                    self.state.clamp_navigator_selection();
+                }
+                MouseEventKind::ScrollDown => {
+                    let viewport = self.state.navigator_body_rect().height as usize;
+                    let max = self.state.navigator_max_scroll(viewport);
+                    self.state.navigator.scroll =
+                        self.state.navigator.scroll.saturating_add(3).min(max);
+                    self.state.navigator.selected = self.state.navigator.scroll;
+                    self.state.clamp_navigator_selection();
+                }
+                _ => {}
+            }
+            return true;
+        }
+
         if self.state.mode == Mode::KeybindHelp {
             match mouse.kind {
                 MouseEventKind::Down(MouseButton::Left)
@@ -188,6 +246,89 @@ impl AppState {
         self.view.sidebar_rect.union(self.view.terminal_area)
     }
 
+    pub(crate) fn navigator_popup_rect(&self) -> Rect {
+        let area = self.onboarding_full_area();
+        let margin_x = (area.width / 16).max(2);
+        let margin_y = (area.height / 10).max(1);
+        let width = area.width.saturating_sub(margin_x.saturating_mul(2));
+        let height = area.height.saturating_sub(margin_y.saturating_mul(2));
+        Rect::new(
+            area.x + margin_x,
+            area.y + margin_y,
+            width.max(4),
+            height.max(4),
+        )
+    }
+
+    pub(crate) fn navigator_inner_rect(&self) -> Rect {
+        Block::default()
+            .borders(Borders::ALL)
+            .inner(self.navigator_popup_rect())
+    }
+
+    pub(crate) fn navigator_search_rect(&self) -> Rect {
+        let inner = self.navigator_inner_rect();
+        Rect::new(inner.x, inner.y, inner.width, inner.height.min(1))
+    }
+
+    pub(crate) fn navigator_body_rect(&self) -> Rect {
+        let inner = self.navigator_inner_rect();
+        if inner.height <= 4 {
+            return Rect::default();
+        }
+        Rect::new(
+            inner.x,
+            inner.y + 2,
+            inner.width,
+            inner.height.saturating_sub(4),
+        )
+    }
+
+    pub(crate) fn navigator_detail_rect(&self) -> Rect {
+        let inner = self.navigator_inner_rect();
+        Rect::new(
+            inner.x,
+            inner.y + inner.height.saturating_sub(2),
+            inner.width,
+            inner.height.min(1),
+        )
+    }
+
+    pub(crate) fn navigator_footer_rect(&self) -> Rect {
+        let inner = self.navigator_inner_rect();
+        Rect::new(
+            inner.x,
+            inner.y + inner.height.saturating_sub(1),
+            inner.width,
+            inner.height.min(1),
+        )
+    }
+
+    pub(crate) fn navigator_popup_contains(&self, col: u16, row: u16) -> bool {
+        rect_contains(self.navigator_popup_rect(), col, row)
+    }
+
+    pub(crate) fn navigator_search_contains(&self, col: u16, row: u16) -> bool {
+        rect_contains(self.navigator_search_rect(), col, row)
+    }
+
+    pub(crate) fn navigator_row_index_at(&self, col: u16, row: u16) -> Option<usize> {
+        let body = self.navigator_body_rect();
+        if !rect_contains(body, col, row) {
+            return None;
+        }
+        let idx = self
+            .navigator
+            .scroll
+            .saturating_add(row.saturating_sub(body.y) as usize);
+        (idx < self.navigator_rows().len()).then_some(idx)
+    }
+
+    pub(crate) fn navigator_row_caret_at(&self, col: u16) -> bool {
+        let body = self.navigator_body_rect();
+        col <= body.x.saturating_add(3)
+    }
+
     pub(super) fn onboarding_modal_inner(&self, popup_w: u16, popup_h: u16) -> Option<Rect> {
         let area = self.onboarding_full_area();
         let popup_w = popup_w.min(area.width.saturating_sub(4));
diff --git a/src/app/mod.rs b/src/app/mod.rs
index cfd5b5f8..8a981226 100644
--- a/src/app/mod.rs
+++ b/src/app/mod.rs
@@ -401,6 +401,7 @@ impl App {
                 }
             }),
             keybind_help: state::KeybindHelpState { scroll: 0 },
+            navigator: state::NavigatorState::default(),
             workspace_scroll: 0,
             agent_panel_scroll: 0,
             tab_scroll: 0,
@@ -1224,6 +1225,9 @@ impl App {
             Mode::Settings => {
                 self.handle_settings_key(key_event);
             }
+            Mode::Navigator => {
+                input::handle_navigator_key(&mut self.state, key_event);
+            }
             Mode::Terminal => {
                 // Should not be called in terminal mode.
             }
@@ -1473,7 +1477,7 @@ mod tests {
         std::fs::create_dir_all(path.parent().unwrap()).unwrap();
         std::fs::write(
             &path,
-            "[terminal]\ndefault_shell = \"nu\"\nnew_cwd = \"home\"\n[keys]\nnew_workspace = \"prefix+g\"\nprefix = \"ctrl+a\"\n[ui]\nagent_panel_scope = \"current\"\n[ui.toast]\ndelivery = \"herdr\"\n",
+            "[terminal]\ndefault_shell = \"nu\"\nnew_cwd = \"home\"\n[keys]\nnew_workspace = \"prefix+m\"\nprefix = \"ctrl+a\"\n[ui]\nagent_panel_scope = \"current\"\n[ui.toast]\ndelivery = \"herdr\"\n",
         )
         .unwrap();
         std::env::set_var(crate::config::CONFIG_PATH_ENV_VAR, &path);
@@ -1488,7 +1492,7 @@ mod tests {
             .state
             .keybinds
             .new_workspace
-            .matches_prefix(&KeyEvent::new(KeyCode::Char('g'), KeyModifiers::empty())));
+            .matches_prefix(&KeyEvent::new(KeyCode::Char('m'), KeyModifiers::empty())));
         assert_eq!(
             app.state.toast_config.delivery,
             crate::config::ToastDelivery::Herdr
@@ -1703,7 +1707,7 @@ mod tests {
         std::fs::create_dir_all(path.parent().unwrap()).unwrap();
         std::fs::write(
             &path,
-            "[keys]\nnew_workspace = \"prefix+g\"\n[ui.toast]\ndelivery = \"desktop\"\n",
+            "[keys]\nnew_workspace = \"prefix+m\"\n[ui.toast]\ndelivery = \"desktop\"\n",
         )
         .unwrap();
         std::env::set_var(crate::config::CONFIG_PATH_ENV_VAR, &path);
@@ -1717,7 +1721,7 @@ mod tests {
             .state
             .keybinds
             .new_workspace
-            .matches_prefix(&KeyEvent::new(KeyCode::Char('g'), KeyModifiers::empty())));
+            .matches_prefix(&KeyEvent::new(KeyCode::Char('m'), KeyModifiers::empty())));
         assert_eq!(
             app.state.toast_config.delivery,
             crate::config::ToastDelivery::Herdr
diff --git a/src/app/state.rs b/src/app/state.rs
index 5d4fb67d..43d6e00f 100644
--- a/src/app/state.rs
+++ b/src/app/state.rs
@@ -3,6 +3,7 @@ use crossterm::event::{KeyCode, KeyModifiers};
 use ratatui::layout::{Direction, Rect};
 use ratatui::style::Color;
 
+use crate::detect::AgentState;
 use crate::layout::{PaneId, PaneInfo, SplitBorder};
 use crate::selection::Selection;
 
@@ -650,6 +651,56 @@ pub enum Mode {
     Settings,
     GlobalMenu,
     KeybindHelp,
+    Navigator,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub(crate) enum NavigatorTarget {
+    Workspace {
+        ws_idx: usize,
+    },
+    Tab {
+        ws_idx: usize,
+        tab_idx: usize,
+    },
+    Pane {
+        ws_idx: usize,
+        tab_idx: usize,
+        pane_id: PaneId,
+    },
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub(crate) struct NavigatorRow {
+    pub target: NavigatorTarget,
+    pub depth: u8,
+    pub label: String,
+    pub meta: String,
+    pub status: AgentState,
+    pub seen: bool,
+    pub is_current: bool,
+    pub is_workspace: bool,
+    pub is_tab: bool,
+    pub expanded: bool,
+    pub search_text: String,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub(crate) enum NavigatorStateFilter {
+    Blocked,
+    Working,
+    Idle,
+    Done,
+}
+
+#[derive(Debug, Clone, Default)]
+pub(crate) struct NavigatorState {
+    pub query: String,
+    pub selected: usize,
+    pub scroll: usize,
+    pub search_focused: bool,
+    pub state_filter: Option<NavigatorStateFilter>,
+    pub expanded_workspaces: std::collections::HashSet<String>,
 }
 
 #[derive(Debug, Clone, Copy, Default, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
@@ -1021,6 +1072,7 @@ pub struct AppState {
     pub release_notes: Option<ReleaseNotesState>,
     pub product_announcement: Option<ProductAnnouncementState>,
     pub keybind_help: KeybindHelpState,
+    pub navigator: NavigatorState,
     pub workspace_scroll: usize,
     pub agent_panel_scroll: usize,
     pub tab_scroll: usize,
@@ -1307,6 +1359,7 @@ impl AppState {
             release_notes: None,
             product_announcement: None,
             keybind_help: KeybindHelpState { scroll: 0 },
+            navigator: NavigatorState::default(),
             workspace_scroll: 0,
             agent_panel_scroll: 0,
             tab_scroll: 0,
diff --git a/src/config/keybinds.rs b/src/config/keybinds.rs
index 014bab7a..e6109e30 100644
--- a/src/config/keybinds.rs
+++ b/src/config/keybinds.rs
@@ -252,6 +252,7 @@ pub struct Keybinds {
     pub rename_workspace: ActionKeybinds,
     pub close_workspace: ActionKeybinds,
     pub workspace_picker: ActionKeybinds,
+    pub goto: ActionKeybinds,
     pub detach: ActionKeybinds,
     pub reload_config: ActionKeybinds,
     pub open_notification_target: ActionKeybinds,
@@ -384,6 +385,7 @@ impl Config {
             rename_workspace: action!("keys.rename_workspace", &self.keys.rename_workspace),
             close_workspace: action!("keys.close_workspace", &self.keys.close_workspace),
             workspace_picker: action!("keys.workspace_picker", &self.keys.workspace_picker),
+            goto: action!("keys.goto", &self.keys.goto),
             detach: action!("keys.detach", &self.keys.detach),
             reload_config: action!("keys.reload_config", &self.keys.reload_config),
             open_notification_target: action!(
@@ -1099,6 +1101,18 @@ next_tab = "prefix+n"
     }
 
     #[test]
+    fn goto_defaults_to_prefix_g() {
+        let kb = Config::default().keybinds();
+        assert_eq!(
+            binding_triggers(&kb.goto),
+            vec![BindingTrigger::Prefix((
+                KeyCode::Char('g'),
+                KeyModifiers::empty()
+            ))]
+        );
+    }
+
+    #[test]
     fn open_and_remove_worktree_keybinds_are_unset_by_default() {
         let kb = Config::default().keybinds();
         assert!(kb.open_worktree.bindings.is_empty());
diff --git a/src/config/model.rs b/src/config/model.rs
index 8894b300..b6b7a2fb 100644
--- a/src/config/model.rs
+++ b/src/config/model.rs
@@ -151,6 +151,8 @@ pub struct KeysConfig {
     pub close_workspace: BindingConfig,
     /// Open the workspace navigation surface. Default: "prefix+w"
     pub workspace_picker: BindingConfig,
+    /// Open the session navigator. Default: "prefix+g"
+    pub goto: BindingConfig,
     /// Detach from server/client mode, or exit --no-session mode. Default: "prefix+q".
     pub detach: BindingConfig,
     /// Reload config.toml in the running app/server. Default: "prefix+shift+r".
@@ -343,6 +345,7 @@ impl Default for KeysConfig {
             rename_workspace: BindingConfig::one("prefix+shift+w"),
             close_workspace: BindingConfig::one("prefix+shift+d"),
             workspace_picker: BindingConfig::one("prefix+w"),
+            goto: BindingConfig::one("prefix+g"),
             detach: BindingConfig::one("prefix+q"),
             reload_config: BindingConfig::one("prefix+shift+r"),
             open_notification_target: BindingConfig::one("prefix+o"),
diff --git a/src/main.rs b/src/main.rs
index 71631ed4..a49b76df 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -106,6 +106,7 @@ const DEFAULT_CONFIG: &str = r##"# herdr configuration
 # reload_config = "prefix+shift+r"
 # open_notification_target = "prefix+o"
 # workspace_picker = "prefix+w"
+# goto = "prefix+g"
 # new_workspace = "prefix+shift+n"
 # new_worktree = "prefix+shift+g"
 # open_worktree = ""    # optional, unset by default
@@ -143,7 +144,7 @@ const DEFAULT_CONFIG: &str = r##"# herdr configuration
 # type = "shell" runs detached in the background.
 # type = "pane" opens a temporary pane and closes it when the command exits.
 # [[keys.command]]
-# key = "prefix+g"
+# key = "prefix+alt+g"
 # type = "pane"
 # command = "lazygit"
 
diff --git a/src/ui.rs b/src/ui.rs
index 0ddaa71c..28504b9e 100644
--- a/src/ui.rs
+++ b/src/ui.rs
@@ -9,6 +9,7 @@ mod dialogs;
 mod keybind_help;
 mod menus;
 mod mobile;
+mod navigator;
 mod onboarding;
 mod panes;
 mod release_notes;
@@ -33,6 +34,7 @@ use self::mobile::{
     mobile_toast_banner_rect, render_mobile_header, render_mobile_panel,
     render_mobile_toast_banner,
 };
+use self::navigator::render_navigator_overlay;
 pub(crate) use self::onboarding::onboarding_welcome_continue_rect;
 use self::onboarding::render_onboarding_overlay;
 use self::panes::{compute_pane_infos, render_panes, resize_tab_panes};
@@ -393,6 +395,7 @@ pub fn render_with_runtime_registry(
         Mode::ConfirmRemoveWorktree => render_remove_worktree_overlay(app, frame, frame.area()),
         Mode::GlobalMenu => render_global_launcher_menu(app, frame),
         Mode::KeybindHelp => render_keybind_help_overlay(app, frame),
+        Mode::Navigator => render_navigator_overlay(app, frame),
         Mode::Terminal => {}
     }
 }
diff --git a/src/ui/keybind_help.rs b/src/ui/keybind_help.rs
index 6fc778ea..c1f0fa74 100644
--- a/src/ui/keybind_help.rs
+++ b/src/ui/keybind_help.rs
@@ -79,6 +79,7 @@ pub(super) fn keybind_help_groups(
 
     let workspace_tab = vec![
         (keybind_label(&kb.workspace_picker), "workspace navigation"),
+        (keybind_label(&kb.goto), "session navigator"),
         (keybind_label(&kb.new_workspace), "new workspace"),
         (keybind_label(&kb.new_worktree), "new worktree"),
         (keybind_label(&kb.open_worktree), "open worktree"),
diff --git a/src/ui/menus.rs b/src/ui/menus.rs
index c83b569f..c37d08d6 100644
--- a/src/ui/menus.rs
+++ b/src/ui/menus.rs
@@ -76,6 +76,7 @@ pub(super) fn render_navigate_overlay(app: &AppState, frame: &mut Frame, area: R
     let resize = prefix_rhs_label(&kb.resize_mode);
     let help = prefix_rhs_label(&kb.help);
     let settings = prefix_rhs_label(&kb.settings);
+    let goto = prefix_rhs_label(&kb.goto);
     let detach = prefix_rhs_label(&kb.detach);
     let line = Line::from(vec![
         Span::styled(" NAVIGATE ", mode_style),
@@ -86,6 +87,8 @@ pub(super) fn render_navigate_overlay(app: &AppState, frame: &mut Frame, area: R
         Span::styled(" ws  ", dim),
         Span::styled("⇥", key),
         Span::styled(" pane  ", dim),
+        Span::styled(goto, key),
+        Span::styled(" navigator  ", dim),
         Span::styled(new_tab, key),
         Span::styled(" new tab  ", dim),
         Span::styled(split_vertical, key),
diff --git a/src/ui/navigator.rs b/src/ui/navigator.rs
new file mode 100644
index 00000000..5cb208ae
--- /dev/null
+++ b/src/ui/navigator.rs
@@ -0,0 +1,480 @@
+use ratatui::{
+    layout::Rect,
+    style::{Modifier, Style},
+    text::{Line, Span},
+    widgets::{Clear, Paragraph},
+    Frame,
+};
+
+use super::{
+    scrollbar::{render_scrollbar, should_show_scrollbar},
+    status::{agent_icon, state_label_color},
+    widgets::{panel_contrast_fg, render_panel_shell},
+};
+use crate::app::state::{AppState, NavigatorRow, NavigatorStateFilter, NavigatorTarget};
+
+pub(super) fn render_navigator_overlay(app: &AppState, frame: &mut Frame) {
+    let popup = app.navigator_popup_rect();
+    let Some(inner) = render_panel_shell(frame, popup, app.palette.accent, app.palette.panel_bg)
+    else {
+        return;
+    };
+
+    let search = app.navigator_search_rect();
+    let body = app.navigator_body_rect();
+    let detail = app.navigator_detail_rect();
+    let footer = app.navigator_footer_rect();
+    render_search(app, frame, search);
+
+    if body.height > 0 {
+        render_separator(frame, Rect::new(inner.x, search.y + 1, inner.width, 1), app);
+        render_rows(app, frame, body);
+        render_navigator_scrollbar(app, frame, body);
+    }
+    render_detail(app, frame, detail);
+    render_footer(app, frame, footer);
+}
+
+fn render_search(app: &AppState, frame: &mut Frame, area: Rect) {
+    let p = &app.palette;
+    let focus_style = if app.navigator.search_focused {
+        Style::default().fg(p.accent).add_modifier(Modifier::BOLD)
+    } else {
+        Style::default().fg(p.overlay0)
+    };
+    let count = app
+        .workspaces
+        .iter()
+        .flat_map(|workspace| workspace.tabs.iter())
+        .map(|tab| tab.panes.len())
+        .sum::<usize>();
+    let mut spans = vec![Span::styled(" / ", focus_style)];
+    let query = app.navigator.query.trim();
+    match app.navigator.state_filter {
+        Some(NavigatorStateFilter::Blocked) => push_state_chip(
+            &mut spans,
+            crate::detect::AgentState::Blocked,
+            true,
+            app.spinner_tick,
+            "blocked",
+            app,
+        ),
+        Some(NavigatorStateFilter::Working) => push_state_chip(
+            &mut spans,
+            crate::detect::AgentState::Working,
+            true,
+            app.spinner_tick,
+            "working",
+            app,
+        ),
+        Some(NavigatorStateFilter::Idle) => push_state_chip(
+            &mut spans,
+            crate::detect::AgentState::Idle,
+            true,
+            app.spinner_tick,
+            "idle",
+            app,
+        ),
+        Some(NavigatorStateFilter::Done) => push_state_chip(
+            &mut spans,
+            crate::detect::AgentState::Idle,
+            false,
+            app.spinner_tick,
+            "done",
+            app,
+        ),
+        None if query.is_empty() => spans.push(Span::styled(
+            "search panes",
+            Style::default().fg(p.overlay0),
+        )),
+        None => spans.push(Span::styled(query.to_string(), Style::default().fg(p.text))),
+    }
+    spans.push(Span::styled(
+        format!(
+            "{count:>width$} panes",
+            width = area.width.saturating_sub(16) as usize
+        ),
+        Style::default().fg(p.overlay0),
+    ));
+    frame.render_widget(Paragraph::new(Line::from(spans)), area);
+}
+
+fn push_state_chip(
+    spans: &mut Vec<Span<'static>>,
+    state: crate::detect::AgentState,
+    seen: bool,
+    tick: u32,
+    label: &'static str,
+    app: &AppState,
+) {
+    let (icon, icon_style) = agent_icon(state, seen, tick, &app.palette);
+    spans.push(Span::styled(icon, icon_style.add_modifier(Modifier::BOLD)));
+    spans.push(Span::raw(" "));
+    spans.push(Span::styled(
+        label,
+        Style::default()
+            .fg(state_label_color(state, seen, &app.palette))
+            .add_modifier(Modifier::BOLD),
+    ));
+}
+
+fn render_separator(frame: &mut Frame, area: Rect, app: &AppState) {
+    if area.height == 0 || area.width == 0 {
+        return;
+    }
+    let line = "─".repeat(area.width as usize);
+    frame.render_widget(
+        Paragraph::new(line).style(Style::default().fg(app.palette.surface1)),
+        area,
+    );
+}
+
+fn render_rows(app: &AppState, frame: &mut Frame, body: Rect) {
+    let rows = app.navigator_rows();
+    let start = app.navigator.scroll.min(rows.len());
+    let end = rows.len().min(start.saturating_add(body.height as usize));
+    for (visible_idx, row) in rows[start..end].iter().enumerate() {
+        let idx = start + visible_idx;
+        let y = body.y + visible_idx as u16;
+        let rect = Rect::new(body.x, y, body.width, 1);
+        let selected = idx == app.navigator.selected;
+        render_row(app, frame, rect, row, selected);
+    }
+}
+
+fn render_row(app: &AppState, frame: &mut Frame, rect: Rect, row: &NavigatorRow, selected: bool) {
+    let p = &app.palette;
+    frame.render_widget(Clear, rect);
+    let base_style = if selected {
+        Style::default().bg(p.accent).fg(panel_contrast_fg(p))
+    } else {
+        Style::default().bg(p.panel_bg).fg(p.text)
+    };
+    let dim_style = if selected {
+        base_style
+    } else {
+        Style::default().fg(p.overlay0).bg(p.panel_bg)
+    };
+    let text_style = if selected {
+        base_style.add_modifier(Modifier::BOLD)
+    } else if row.is_current {
+        Style::default()
+            .fg(p.text)
+            .bg(p.panel_bg)
+            .add_modifier(Modifier::BOLD)
+    } else {
+        Style::default().fg(p.subtext0).bg(p.panel_bg)
+    };
+    let (status_icon, status_style) = agent_icon(row.status, row.seen, app.spinner_tick, p);
+    let status_style = if selected {
+        base_style.add_modifier(Modifier::BOLD)
+    } else {
+        status_style.bg(p.panel_bg)
+    };
+
+    let prefix = if row.is_workspace {
+        if row.expanded {
+            "▾"
+        } else {
+            "▸"
+        }
+    } else if row.depth > 0 {
+        "├─"
+    } else {
+        "  "
+    };
+    let current = if row.is_current { "◆" } else { " " };
+    let marker = if selected { "→" } else { " " };
+    let indent = "  ".repeat(row.depth as usize);
+    let left_fixed = format!(" {indent}{prefix} {marker} {current} ");
+    let meta_width = metadata_width(rect.width);
+    let left_budget = rect
+        .width
+        .saturating_sub(meta_width)
+        .saturating_sub(left_fixed.chars().count() as u16)
+        .saturating_sub(3) as usize;
+    let title = truncate_text(&row.label, left_budget);
+
+    let spans = vec![
+        Span::styled(left_fixed, dim_style),
+        Span::styled(status_icon, status_style),
+        Span::raw(" "),
+        Span::styled(title, text_style),
+    ];
+    frame.render_widget(Paragraph::new(Line::from(spans)).style(base_style), rect);
+
+    if meta_width > 0 {
+        let meta_rect = Rect::new(
+            rect.x + rect.width.saturating_sub(meta_width),
+            rect.y,
+            meta_width,
+            1,
+        );
+        let meta = truncate_text(&row.meta, meta_width.saturating_sub(2) as usize);
+        let meta_style = if selected {
+            base_style
+        } else if row.is_workspace || row.is_tab {
+            Style::default().fg(p.overlay0).bg(p.panel_bg)
+        } else {
+            Style::default()
+                .fg(state_label_color(row.status, row.seen, p))
+                .bg(p.panel_bg)
+        };
+        frame.render_widget(
+            Paragraph::new(format!(" {meta}")).style(meta_style),
+            meta_rect,
+        );
+    }
+}
+
+fn render_navigator_scrollbar(app: &AppState, frame: &mut Frame, body: Rect) {
+    if body.width <= 1 || body.height == 0 {
+        return;
+    }
+    let rows = app.navigator_rows().len();
+    let viewport = body.height as usize;
+    if rows <= viewport {
+        return;
+    }
+    let metrics = crate::pane::ScrollMetrics {
+        viewport_rows: viewport,
+        offset_from_bottom: rows
+            .saturating_sub(viewport)
+            .saturating_sub(app.navigator.scroll),
+        max_offset_from_bottom: rows.saturating_sub(viewport),
+    };
+    if !should_show_scrollbar(metrics) {
+        return;
+    }
+    let track = Rect::new(body.x + body.width - 1, body.y, 1, body.height);
+    render_scrollbar(
+        frame,
+        metrics,
+        track,
+        app.palette.surface_dim,
+        app.palette.overlay0,
+        "▕",
+    );
+}
+
+fn metadata_width(width: u16) -> u16 {
+    if width >= 90 {
+        28
+    } else if width >= 68 {
+        20
+    } else if width >= 52 {
+        14
+    } else {
+        0
+    }
+}
+
+fn render_detail(app: &AppState, frame: &mut Frame, area: Rect) {
+    if area.height == 0 || area.width == 0 {
+        return;
+    }
+    render_separator(frame, area, app);
+    let detail = selected_detail(app);
+    if detail.is_empty() {
+        return;
+    }
+    let text = middle_elide(&detail, area.width.saturating_sub(2) as usize);
+    frame.render_widget(
+        Paragraph::new(format!(" {text}")).style(Style::default().fg(app.palette.overlay0)),
+        area,
+    );
+}
+
+fn selected_detail(app: &AppState) -> String {
+    let rows = app.navigator_rows();
+    let Some(row) = rows.get(app.navigator.selected) else {
+        return String::new();
+    };
+    match row.target {
+        NavigatorTarget::Workspace { ws_idx } => workspace_detail(app, ws_idx),
+        NavigatorTarget::Tab { ws_idx, tab_idx } => tab_detail(app, ws_idx, tab_idx),
+        NavigatorTarget::Pane {
+            ws_idx,
+            tab_idx,
+            pane_id,
+        } => pane_detail(app, ws_idx, tab_idx, pane_id),
+    }
+}
+
+fn workspace_detail(app: &AppState, ws_idx: usize) -> String {
+    let Some(ws) = app.workspaces.get(ws_idx) else {
+        return String::new();
+    };
+    let terminal_runtimes = crate::terminal::TerminalRuntimeRegistry::new();
+    let label = ws.display_name_from(&app.terminals, &terminal_runtimes);
+    let pane_count = ws.tabs.iter().map(|tab| tab.panes.len()).sum::<usize>();
+    let mut parts = vec![label, format!("{pane_count} panes")];
+    if !rowless_workspace_activity(app, ws_idx).is_empty() {
+        parts.push(rowless_workspace_activity(app, ws_idx));
+    }
+    parts.join(" · ")
+}
+
+fn tab_detail(app: &AppState, ws_idx: usize, tab_idx: usize) -> String {
+    let Some(ws) = app.workspaces.get(ws_idx) else {
+        return String::new();
+    };
+    let Some(tab) = ws.tabs.get(tab_idx) else {
+        return String::new();
+    };
+    let terminal_runtimes = crate::terminal::TerminalRuntimeRegistry::new();
+    let mut parts = vec![
+        ws.display_name_from(&app.terminals, &terminal_runtimes),
+        format!("tab: {}", tab.display_name()),
+        format!("{} panes", tab.panes.len()),
+    ];
+    let rows = app.navigator_rows();
+    if let Some(meta) = rows
+        .into_iter()
+        .find(|row| matches!(row.target, NavigatorTarget::Tab { ws_idx: row_ws_idx, tab_idx: row_tab_idx } if row_ws_idx == ws_idx && row_tab_idx == tab_idx))
+        .map(|row| row.meta)
+        .filter(|meta| !meta.is_empty())
+    {
+        parts.push(meta);
+    }
+    parts.join(" · ")
+}
+
+fn pane_detail(
+    app: &AppState,
+    ws_idx: usize,
+    tab_idx: usize,
+    pane_id: crate::layout::PaneId,
+) -> String {
+    let Some(ws) = app.workspaces.get(ws_idx) else {
+        return String::new();
+    };
+    let Some(tab) = ws.tabs.get(tab_idx) else {
+        return String::new();
+    };
+    let terminal_runtimes = crate::terminal::TerminalRuntimeRegistry::new();
+    let mut parts = vec![ws.display_name_from(&app.terminals, &terminal_runtimes)];
+    if ws.tabs.len() > 1 {
+        parts.push(format!("tab: {}", tab.display_name()));
+    }
+    if let Some(pane_number) = ws.public_pane_number(pane_id) {
+        parts.push(format!("pane {pane_number}"));
+    }
+    if let Some(terminal_id) = tab.terminal_id(pane_id) {
+        if let Some(terminal) = app.terminals.get(terminal_id) {
+            if let Some(agent) = terminal
+                .agent_name
+                .as_deref()
+                .or_else(|| terminal.effective_agent_label())
+            {
+                parts.push(agent.to_string());
+                let seen = tab
+                    .panes
+                    .get(&pane_id)
+                    .map(|pane| pane.seen)
+                    .unwrap_or(true);
+                parts.push(
+                    display_state(row_state(app, ws_idx, tab_idx, pane_id), seen).to_string(),
+                );
+            } else {
+                parts.push("shell".to_string());
+            }
+            if let Some(status) = terminal.effective_custom_status() {
+                parts.push(status.to_string());
+            }
+        }
+    }
+    parts.join(" · ")
+}
+
+fn rowless_workspace_activity(app: &AppState, ws_idx: usize) -> String {
+    app.navigator_rows()
+        .into_iter()
+        .find(|row| matches!(row.target, NavigatorTarget::Workspace { ws_idx: row_ws_idx } if row_ws_idx == ws_idx))
+        .map(|row| row.meta)
+        .unwrap_or_default()
+}
+
+fn row_state(
+    app: &AppState,
+    ws_idx: usize,
+    tab_idx: usize,
+    pane_id: crate::layout::PaneId,
+) -> crate::detect::AgentState {
+    app.workspaces
+        .get(ws_idx)
+        .and_then(|ws| ws.tabs.get(tab_idx))
+        .and_then(|tab| tab.terminal_id(pane_id))
+        .and_then(|terminal_id| app.terminals.get(terminal_id))
+        .map(|terminal| terminal.state)
+        .unwrap_or(crate::detect::AgentState::Unknown)
+}
+
+fn display_state(state: crate::detect::AgentState, seen: bool) -> &'static str {
+    match (state, seen) {
+        (crate::detect::AgentState::Blocked, _) => "blocked",
+        (crate::detect::AgentState::Working, _) => "working",
+        (crate::detect::AgentState::Idle, false) => "done",
+        (crate::detect::AgentState::Idle, true) => "idle",
+        (crate::detect::AgentState::Unknown, _) => "unknown",
+    }
+}
+
+fn middle_elide(text: &str, max_width: usize) -> String {
+    let len = text.chars().count();
+    if len <= max_width {
+        return text.to_string();
+    }
+    if max_width <= 1 {
+        return "…".to_string();
+    }
+    let left = max_width.saturating_sub(1) / 2;
+    let right = max_width.saturating_sub(1).saturating_sub(left);
+    let prefix: String = text.chars().take(left).collect();
+    let suffix: String = text
+        .chars()
+        .rev()
+        .take(right)
+        .collect::<Vec<_>>()
+        .into_iter()
+        .rev()
+        .collect();
+    format!("{prefix}…{suffix}")
+}
+
+fn render_footer(app: &AppState, frame: &mut Frame, area: Rect) {
+    if area.height == 0 {
+        return;
+    }
+    let p = &app.palette;
+    let key = Style::default().fg(p.accent).add_modifier(Modifier::BOLD);
+    let dim = Style::default().fg(p.overlay0);
+    let line = Line::from(vec![
+        Span::styled(" enter", key),
+        Span::styled(" switch  ", dim),
+        Span::styled("/", key),
+        Span::styled(" search  ", dim),
+        Span::styled("b/w/i/d/a", key),
+        Span::styled(" states  ", dim),
+        Span::styled("j/k/↑↓", key),
+        Span::styled(" move  ", dim),
+        Span::styled("esc", key),
+        Span::styled(" close", dim),
+    ]);
+    frame.render_widget(Paragraph::new(line), area);
+}
+
+fn truncate_text(text: &str, max_width: usize) -> String {
+    let len = text.chars().count();
+    if len <= max_width {
+        return text.to_string();
+    }
+    if max_width == 0 {
+        return String::new();
+    }
+    if max_width == 1 {
+        return "…".to_string();
+    }
+    let prefix: String = text.chars().take(max_width.saturating_sub(1)).collect();
+    format!("{prefix}…")
+}