feat(tui): codex-style input, history, bang commands, single-line status bar

- Arrow-key input history (up/down with multiline awareness)
- Bang shell commands via ! prefix (requires --yolo)
- Codex-style input bar with mode indicator (R/Y/⌘)
- Command palette virtual scrolling
- Multiline input viewport fix
- Merged model pills + footer into single status line
- Removed shift+enter (wait for TUI library support)
- Removed default footer hints

README.md

@@ -100,11 +100,13 @@ go run . [flags]
 ## TUI Controls
 
 - `enter` sends the message.
-- `ctrl+j` or `alt+enter` inserts a newline.
+- `ctrl+j` inserts a newline.
+- `up` recalls the previous input; `ctrl+p` / `ctrl+n` navigate input history.
 - The input starts at one line and grows up to six lines.
 - `page up` / `page down` scrolls the transcript.
 - `esc` cancels a running response.
 - Type `/` to show available commands.
+- In `--yolo` mode, type `! <command>` to run a shell command from the configured working directory.
 
 Slash commands:
 
@@ -116,6 +118,7 @@ Slash commands:
 - `/model` shows current provider, model, thinking, and switch usage.
 - `/model provider <name>` switches provider for the current session.
 - `/model model <name>` or `/model <name>` switches model for the current session.
+  In the TUI, type `/model ` or `/model model ` to choose from configured model IDs in the candidate palette.
 - `/model thinking <none|middle|high|xhigh|max>` changes thinking for the current session.
 - `/sessions` lists saved sessions.
 - `/resume [id]` resumes by ID or opens an interactive picker.

internal/session/manager.go

@@ -288,9 +288,13 @@ func (m *Manager) providerNames() []string {
 	return names
 }
 
+func (m *Manager) AvailableModels() []string {
+	return append([]string(nil), m.provider.Models...)
+}
+
 func contains(values []string, value string) bool {
-	for _, item := range values {
-		if item == value {
+	for _, v := range values {
+		if v == value {
 			return true
 		}
 	}

internal/session/manager_test.go

@@ -109,6 +109,18 @@ func TestManagerRejectsUnknownModelAndThinking(t *testing.T) {
 	}
 }
 
+func TestManagerExposesModelCommandCandidates(t *testing.T) {
+	manager, _, _ := testManager(t)
+	models := manager.AvailableModels()
+	if len(models) != 2 || models[0] != "model-a" || models[1] != "model-b" {
+		t.Fatalf("AvailableModels() = %v", models)
+	}
+	models[0] = "mutated"
+	if got := manager.AvailableModels()[0]; got != "model-a" {
+		t.Fatalf("mutation leaked: %q", got)
+	}
+}
+
 func TestManagerSaveAndResume(t *testing.T) {
 	manager, assistant, _ := testManager(t)
 

internal/tui/app.go

@@ -50,6 +50,7 @@ type ModelManager interface {
 	Rename(name string) (string, error)
 	Sessions() (string, error)
 	NewSession() (string, error)
+	AvailableModels() []string
 }
 
 func Run(ctx context.Context, assistant *agent.Agent, opts Options) error {
@@ -96,6 +97,7 @@ type model struct {
 	inputHistory  []string
 	historyIndex  int
 	draftInput    string
+	commandCursor int
 
 	running bool
 	cancel  context.CancelFunc
@@ -133,6 +135,13 @@ type commandMatch struct {
 	score   int
 }
 
+type commandSuggestion struct {
+	label       string
+	description string
+	value       string
+	executable  bool
+}
+
 var slashCommands = []slashCommand{
 	{Name: "/clear", Description: "reset context"},
 	{Name: "/compact", Description: "compress context"},
@@ -157,7 +166,7 @@ func newModel(ctx context.Context, assistant *agent.Agent, opts Options) model {
 	st := th.styles()
 
 	input := textarea.New()
-	input.Placeholder = "Message agentu..."
+	input.Placeholder = ""
 	input.Prompt = ""
 	input.ShowLineNumbers = false
 	input.MaxHeight = maxInputLines
@@ -197,8 +206,6 @@ func (m model) Init() tea.Cmd {
 	m.syncMessages()
 	return textarea.Blink
 }
-
-// syncMessages rebuilds the TUI display messages from the agent's conversation history.
 func (m *model) syncMessages() {
 	if m.agent == nil {
 		return
@@ -246,6 +253,9 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		if m.picking {
 			return m.updatePicker(msg)
 		}
+		if handled, next, cmd := m.updateCommandSuggestions(msg); handled {
+			return next, cmd
+		}
 		switch msg.String() {
 		case "ctrl+c":
 			if m.cancel != nil {
@@ -263,6 +273,29 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 				return m, nil
 			}
 			return m.submit()
+		case "up":
+			if m.running {
+				return m, nil
+			}
+			if m.input.Line() == 0 {
+				m.previousInputHistory()
+				m.afterInputChanged()
+				return m, nil
+			}
+		case "down":
+			if m.running {
+				return m, nil
+			}
+			value := m.input.Value()
+			lineCount := 1
+			if value != "" {
+				lineCount = len(strings.Split(value, "\n"))
+			}
+			if m.input.Line() >= lineCount-1 {
+				m.nextInputHistory()
+				m.afterInputChanged()
+				return m, nil
+			}
 		case "ctrl+p":
 			if m.running {
 				return m, nil
@@ -277,7 +310,7 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			m.nextInputHistory()
 			m.afterInputChanged()
 			return m, nil
-		case "alt+enter", "ctrl+j":
+		case "ctrl+j":
 			return m.insertInputNewline()
 		}
 
@@ -338,7 +371,6 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	if !m.running {
 		nextInput, cmd := m.input.Update(msg)
 		m.input = nextInput
-		m.afterInputChanged()
 		cmds = append(cmds, cmd)
 	}
 
@@ -356,7 +388,7 @@ func (m model) View() string {
 
 	if m.picking {
 		parts := []string{m.viewport.View()}
-		parts = append(parts, m.pickerView(), m.modelMetaView(), m.footerView())
+		parts = append(parts, m.pickerView(), m.footerView())
 		body := lipgloss.JoinVertical(lipgloss.Left, parts...)
 		return m.styles.App.Width(m.width).Height(m.height).Render(body)
 	}
@@ -365,7 +397,7 @@ func (m model) View() string {
 	if activity := m.activityView(); activity != "" {
 		parts = append(parts, activity)
 	}
-	parts = append(parts, m.inputView(), m.modelMetaView(), m.footerView())
+	parts = append(parts, m.inputView(), m.footerView())
 	body := lipgloss.JoinVertical(lipgloss.Left, parts...)
 	return m.styles.App.Width(m.width).Height(m.height).Render(body)
 }
@@ -393,6 +425,10 @@ func (m *model) submit() (tea.Model, tea.Cmd) {
 		return m.runLocalCommand(input)
 	}
 
+	if strings.HasPrefix(input, "!") {
+		return m.runLocalCommand(input)
+	}
+
 	if strings.HasPrefix(input, "/") {
 		return m.runLocalCommand(input)
 	}
@@ -438,6 +474,16 @@ func (m *model) insertInputNewline() (tea.Model, tea.Cmd) {
 	m.historyIndex = -1
 	m.draftInput = ""
 	m.afterInputChanged()
+	// The textarea's repositionView was called inside Update with the old
+	// viewport height, so the YOffset may be stale after syncInputHeight
+	// changed the height. Send up then down to force repositionView to
+	// recalculate with the new height.
+	up := tea.KeyMsg{Type: tea.KeyUp}
+	vp, _ := m.input.Update(up)
+	m.input = vp
+	down := tea.KeyMsg{Type: tea.KeyDown}
+	vp, _ = m.input.Update(down)
+	m.input = vp
 	return *m, cmd
 }
 
@@ -467,7 +513,7 @@ func (m *model) appendAssistantChunk(chunk string) {
 
 func (m *model) resize() {
 	width := max(40, m.width)
-	inputWidth := max(20, width-m.styles.InputBox.GetHorizontalFrameSize())
+	inputWidth := max(20, width-m.styles.InputBox.GetHorizontalFrameSize()-m.inputModeWidth()-1)
 	m.input.SetWidth(inputWidth)
 	m.syncInputHeight()
 
@@ -668,72 +714,25 @@ type metaPill struct {
 	accent bool
 }
 
-func (m model) renderMetaPills(parts []metaPill) string {
-	if len(parts) == 0 {
-		return ""
+func (m model) inputModeView() string {
+	if strings.HasPrefix(strings.TrimSpace(m.input.Value()), "!") {
+		return m.styles.InputModeCommand.Render(iconCommand)
 	}
-
-	plain := make([]string, len(parts))
-	for i, part := range parts {
-		plain[i] = part.text
+	if m.yolo {
+		return m.styles.InputModeYolo.Render("Y")
 	}
-
-	width := max(1, m.width-2)
-	visible := len(plain)
-	for visible > 1 && lipgloss.Width(strings.Join(plain[:visible], " ")) > width {
-		visible--
-	}
-	if lipgloss.Width(strings.Join(plain[:visible], " ")) > width {
-		return m.styles.PillAccent.Render(fitLine(plain[0], width))
-	}
-
-	rendered := make([]string, 0, visible)
-	for i := 0; i < visible; i++ {
-		style := m.styles.Pill
-		if parts[i].accent {
-			style = m.styles.PillAccent
-		}
-		rendered = append(rendered, style.Render(parts[i].text))
-	}
-	return strings.Join(rendered, " ")
+	return m.styles.InputModeReadonly.Render("R")
 }
 
-func (m model) modelMetaView() string {
-	mode := "read-only tools"
-	if m.yolo {
-		mode = "yolo tools"
-	}
-
-	modelName := m.modelName
-	if m.models != nil {
-		if currentModel := m.models.CurrentModel(); currentModel != "" {
-			modelName = currentModel
-		}
-	}
-
-	parts := []metaPill{{text: iconModel + " " + modelName, accent: true}}
-	if m.models != nil {
-		if provider := m.models.CurrentProvider(); provider != "" {
-			parts = append(parts, metaPill{text: "provider " + provider})
-		}
-		if currentThinking := m.models.CurrentThinking(); currentThinking != "" && currentThinking != "unset" {
-			parts = append(parts, metaPill{text: "thinking " + currentThinking})
-		}
-		if sessionName := m.models.CurrentSessionName(); sessionName != "" {
-			parts = append(parts, metaPill{text: iconSession + " " + sessionName})
-		}
-	}
-	if m.contextUsage != "" {
-		parts = append(parts, metaPill{text: iconContext + " " + m.contextUsage})
-	}
-	parts = append(parts, metaPill{text: mode}, metaPill{text: "theme " + string(m.theme.Mode)})
-
-	return m.styles.ModelMeta.Width(max(1, m.width)).Render(m.renderMetaPills(parts))
+func (m model) inputModeWidth() int {
+	return lipgloss.Width(m.inputModeView())
 }
 
 func (m model) inputView() string {
 	palette := m.commandPaletteView()
-	box := m.styles.InputBox.Width(max(20, m.width-2)).Render(m.input.View())
+	gap := lipgloss.NewStyle().Background(m.styles.InputBox.GetBackground()).Render(" ")
+	content := lipgloss.JoinHorizontal(lipgloss.Top, m.inputModeView(), gap, m.input.View())
+	box := m.styles.InputBox.Width(max(20, m.width)).Render(content)
 	if palette != "" {
 		return lipgloss.JoinVertical(lipgloss.Left, palette, box)
 	}
@@ -751,13 +750,85 @@ func (m model) activityView() string {
 	line := m.styles.StatusInfo.Render(iconWorking) + " Working " + m.spinner.View() + " " + status + " · esc cancels"
 	return m.styles.Activity.Render(fitLine(line, max(1, m.width-2)))
 }
-
 func (m model) footerView() string {
-	hint := "enter send · ctrl+j newline · alt+enter newline · ctrl+p/ctrl+n history · / commands"
+	hint := ""
 	if m.running {
 		hint = "esc cancel · ctrl+c quit"
 	}
-	return m.styles.Footer.Width(max(1, m.width)).Render(fitLine(hint, max(1, m.width-2)))
+	if m.showCommandPalette() {
+		if sug, ok := m.selectedCommandSuggestion(); ok && sug.executable {
+			hint = "↑/↓ select · enter apply · tab fill"
+		}
+	}
+
+	inner := max(1, m.width-2) // Footer padding(0,1)
+	pills := m.modelMetaPillsClamped(inner / 3)
+	pillsW := lipgloss.Width(pills)
+
+	var line string
+	if pills != "" {
+		remain := max(1, inner-pillsW-1)
+		line = pills + " " + fitLine(hint, remain)
+	} else {
+		line = fitLine(hint, inner)
+	}
+	return m.styles.Footer.Width(max(1, m.width)).Render(line)
+}
+
+func (m model) modelMetaPillsClamped(maxW int) string {
+	modelName := m.modelName
+	if m.models != nil {
+		if currentModel := m.models.CurrentModel(); currentModel != "" {
+			modelName = currentModel
+		}
+	}
+
+	parts := []metaPill{{text: iconModel + " " + modelName, accent: true}}
+	if m.models != nil {
+		if provider := m.models.CurrentProvider(); provider != "" {
+			parts = append(parts, metaPill{text: provider})
+		}
+		if currentThinking := m.models.CurrentThinking(); currentThinking != "" && currentThinking != "unset" {
+			parts = append(parts, metaPill{text: currentThinking})
+		}
+		if sessionName := m.models.CurrentSessionName(); sessionName != "" {
+			parts = append(parts, metaPill{text: iconSession + " " + sessionName})
+		}
+	}
+	if m.contextUsage != "" {
+		parts = append(parts, metaPill{text: iconContext + " " + m.contextUsage})
+	}
+
+	return m.renderMetaPillsClamped(parts, maxW)
+}
+
+func (m model) renderMetaPillsClamped(parts []metaPill, width int) string {
+	if len(parts) == 0 {
+		return ""
+	}
+
+	plain := make([]string, len(parts))
+	for i, part := range parts {
+		plain[i] = part.text
+	}
+
+	visible := len(plain)
+	for visible > 1 && lipgloss.Width(strings.Join(plain[:visible], " ")) > width {
+		visible--
+	}
+	if visible > 0 && lipgloss.Width(strings.Join(plain[:visible], " ")) > width {
+		return ""
+	}
+
+	rendered := make([]string, 0, visible)
+	for i := 0; i < visible; i++ {
+		style := m.styles.Pill
+		if parts[i].accent {
+			style = m.styles.PillAccent
+		}
+		rendered = append(rendered, style.Render(parts[i].text))
+	}
+	return strings.Join(rendered, " ")
 }
 
 type eventWriter struct {
@@ -801,6 +872,7 @@ func isViewportKey(key string) bool {
 }
 
 func (m *model) afterInputChanged() {
+	m.commandCursor = 0
 	m.syncInputHeight()
 	if m.width > 0 && m.height > 0 {
 		m.resize()
@@ -882,18 +954,37 @@ func (m model) inputBlockHeight() int {
 }
 
 func (m model) commandPaletteHeight() int {
-	matches := commandMatches(commandPaletteQuery(m.input.Value()))
-	count := len(matches)
-	if count > maxCommandPaletteItems {
-		count = maxCommandPaletteItems
+	sugs := m.commandSuggestions()
+	total := len(sugs)
+	if !m.showCommandPalette() {
+		return 0
 	}
+	count := min(total, maxCommandPaletteItems)
 	if count == 0 {
 		count = 1
 	}
-	return 1 + count + m.styles.Palette.GetVerticalFrameSize()
+	scrollUp := 0
+	scrollDown := 0
+	if total > maxCommandPaletteItems {
+		visible := min(total, maxCommandPaletteItems)
+		scroll := max(0, m.commandCursor-visible+1)
+		if m.commandCursor < scroll {
+			scroll = m.commandCursor
+		}
+		if scroll > 0 {
+			scrollUp = 1
+		}
+		if scroll+visible < total {
+			scrollDown = 1
+		}
+	}
+	return 1 + scrollUp + count + scrollDown + m.styles.Palette.GetVerticalFrameSize()
 }
 
 func (m model) showCommandPalette() bool {
+	if len(m.commandSuggestions()) > 0 {
+		return true
+	}
 	value := strings.TrimSpace(m.input.Value())
 	return strings.HasPrefix(value, "/") && !strings.Contains(value, " ")
 }
@@ -902,18 +993,42 @@ func (m model) commandPaletteView() string {
 	if !m.showCommandPalette() {
 		return ""
 	}
-	matches := commandMatches(commandPaletteQuery(m.input.Value()))
+	sugs := m.commandSuggestions()
+	if len(sugs) > 0 {
+		header := iconCommand + " Commands"
+		if sugs[0].executable {
+			header = iconCommand + " Model candidates"
+		}
+		lines := []string{m.styles.Header.Render(header)}
+		m.clampCommandCursor()
+		total := len(sugs)
+		visible := min(total, maxCommandPaletteItems)
+		scroll := max(0, m.commandCursor-visible+1)
+		if m.commandCursor < scroll {
+			scroll = m.commandCursor
+		}
+		if scroll > 0 {
+			lines = append(lines, m.styles.Muted.Render("  ↑ more"))
+		}
+		for i := scroll; i < scroll+visible && i < total; i++ {
+			s := sugs[i]
+			prefix := "  "
+			if i == m.commandCursor {
+				prefix = "▸ "
+			}
+			lines = append(lines, fmt.Sprintf("%s%s %s", prefix, m.styles.PaletteMatch.Render(s.label), m.styles.Muted.Render(s.description)))
+		}
+		if scroll+visible < total {
+			lines = append(lines, m.styles.Muted.Render("  ↓ more"))
+		}
+		return m.styles.Palette.Width(max(20, m.width-2)).Render(strings.Join(lines, "\n"))
+	}
+	value := strings.TrimSpace(m.input.Value())
+	if strings.Contains(value, " ") {
+		return ""
+	}
 	lines := []string{m.styles.Header.Render(iconCommand + " Commands")}
-	if len(matches) == 0 {
 	lines = append(lines, m.styles.Muted.Render("No matching commands"))
-	} else {
-		for i, match := range matches {
-			if i >= maxCommandPaletteItems {
-				break
-			}
-			lines = append(lines, fmt.Sprintf("%s %s", m.styles.PaletteMatch.Render(match.command.Name), m.styles.Muted.Render(match.command.Description)))
-		}
-	}
 	return m.styles.Palette.Width(max(20, m.width-2)).Render(strings.Join(lines, "\n"))
 }
 
@@ -991,6 +1106,162 @@ func subsequenceScore(candidate string, query string, base int) (int, bool) {
 	return base + gaps, true
 }
 
+func (m model) commandSuggestions() []commandSuggestion {
+	input := m.input.Value()
+	if sugs := m.modelCommandSuggestions(input); len(sugs) > 0 {
+		return sugs
+	}
+	value := strings.TrimSpace(input)
+	if strings.HasPrefix(value, "/") && !strings.Contains(value, " ") {
+		return slashCommandSuggestions(commandPaletteQuery(input))
+	}
+	return nil
+}
+
+func slashCommandSuggestions(query string) []commandSuggestion {
+	matches := commandMatches(query)
+	sugs := make([]commandSuggestion, 0, len(matches))
+	for _, m := range matches {
+		sugs = append(sugs, commandSuggestion{
+			label:       m.command.Name,
+			description: m.command.Description,
+			value:       m.command.Name,
+		})
+	}
+	return sugs
+}
+
+func splitModelCommandTail(input string) (query string, ok bool) {
+	fields := strings.Fields(input)
+	if len(fields) == 0 || fields[0] != "/model" {
+		return "", false
+	}
+	hasTrailingSpace := strings.TrimRight(input, " \t") != input
+	switch len(fields) {
+	case 1:
+		if !hasTrailingSpace {
+			return "", false
+		}
+		return "", true
+	case 2:
+		if fields[1] == "provider" || fields[1] == "thinking" {
+			return "", false
+		}
+		if fields[1] == "model" {
+			if !hasTrailingSpace {
+				return "", false
+			}
+			return "", true
+		}
+		if hasTrailingSpace {
+			return fields[1], true
+		}
+		return fields[1], true
+	case 3:
+		if fields[1] != "model" {
+			return "", false
+		}
+		if hasTrailingSpace {
+			return fields[2], true
+		}
+		return fields[2], true
+	default:
+		return "", false
+	}
+}
+
+func (m model) modelCommandSuggestions(input string) []commandSuggestion {
+	if m.models == nil {
+		return nil
+	}
+	query, ok := splitModelCommandTail(input)
+	if !ok {
+		return nil
+	}
+	available := m.models.AvailableModels()
+	if len(available) == 0 {
+		return nil
+	}
+	current := m.models.CurrentModel()
+	candidates := make([]commandSuggestion, 0, len(available))
+	for _, id := range available {
+		desc := "switch model"
+		if id == current {
+			desc = "current model"
+		}
+		candidates = append(candidates, commandSuggestion{
+			label:       id,
+			description: desc,
+			value:       "/model model " + id,
+			executable:  true,
+		})
+	}
+	return scoredCommandSuggestions(candidates, query)
+}
+
+func scoredCommandSuggestions(candidates []commandSuggestion, query string) []commandSuggestion {
+	if query == "" {
+		return candidates
+	}
+	type scored struct {
+		sug   commandSuggestion
+		score int
+		idx   int
+	}
+	var kept []scored
+	for i, c := range candidates {
+		if s, ok := scoreCommandSuggestion(c.label, query); ok {
+			kept = append(kept, scored{sug: c, score: s, idx: i})
+		}
+	}
+	sort.Slice(kept, func(i, j int) bool {
+		if kept[i].score != kept[j].score {
+			return kept[i].score < kept[j].score
+		}
+		return kept[i].idx < kept[j].idx
+	})
+	out := make([]commandSuggestion, 0, len(kept))
+	for _, s := range kept {
+		out = append(out, s.sug)
+	}
+	return out
+}
+
+func scoreCommandSuggestion(label string, query string) (int, bool) {
+	query = strings.ToLower(strings.TrimSpace(query))
+	name := strings.ToLower(label)
+	if query == "" || query == name {
+		return 0, true
+	}
+	if strings.HasPrefix(name, query) {
+		return 100 + len(name) - len(query), true
+	}
+	return subsequenceScore(name, query, 200)
+}
+
+func (m model) selectedCommandSuggestion() (commandSuggestion, bool) {
+	sugs := m.commandSuggestions()
+	m.clampCommandCursor()
+	if m.commandCursor >= 0 && m.commandCursor < len(sugs) {
+		return sugs[m.commandCursor], true
+	}
+	return commandSuggestion{}, false
+}
+
+func (m *model) clampCommandCursor() {
+	sugs := m.commandSuggestions()
+	if len(sugs) == 0 {
+		m.commandCursor = 0
+		return
+	}
+	if m.commandCursor < 0 {
+		m.commandCursor = 0
+	}
+	if m.commandCursor >= len(sugs) {
+		m.commandCursor = len(sugs) - 1
+	}
+}
+
 func (m model) slashSuggestionCount() int {
 	return m.commandPaletteHeight()
 }
@@ -1007,11 +1278,7 @@ func (m model) modelInfo() string {
 	if m.models != nil {
 		return m.models.Info()
 	}
-	mode := "read-only tools"
-	if m.yolo {
-		mode = "yolo tools"
-	}
-	return fmt.Sprintf("model: %s\nmode: %s\ntheme: %s", m.modelName, mode, m.theme.Mode)
+	return m.modelName
 }
 
 func (m *model) refreshContextUsage() {
@@ -1146,7 +1413,31 @@ func (m *model) handleThemeCommand(input string) (tea.Model, tea.Cmd) {
 	return *m, nil
 }
 
+func (m model) handleBangCommand(input string) (string, error) {
+	command := strings.TrimSpace(strings.TrimPrefix(strings.TrimSpace(input), "!"))
+	if command == "" {
+		return "", fmt.Errorf("usage: ! <command>")
+	}
+	if !m.yolo {
+		return "", fmt.Errorf("shell command input requires --yolo")
+	}
+	out, err := m.runShellCommand(command)
+	if err != nil {
+		if strings.TrimSpace(out) != "" {
+			return "", fmt.Errorf("%s\n%w", strings.TrimRight(out, "\n"), err)
+		}
+		return "", err
+	}
+	if strings.TrimSpace(out) == "" {
+		return fmt.Sprintf("$ %s\n(no output)", command), nil
+	}
+	return out, nil
+}
+
 func (m model) handleLocalCommand(input string) (string, error) {
+	if strings.HasPrefix(strings.TrimSpace(input), "!") {
+		return m.handleBangCommand(input)
+	}
 	fields := strings.Fields(input)
 	if len(fields) == 0 {
 		return "", fmt.Errorf("empty command")
@@ -1342,6 +1633,41 @@ func (m *model) updatePicker(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 	return *m, nil
 }
 
+func (m *model) updateCommandSuggestions(msg tea.KeyMsg) (bool, tea.Model, tea.Cmd) {
+	if m.running || len(m.commandSuggestions()) == 0 {
+		return false, *m, nil
+	}
+	m.clampCommandCursor()
+	switch msg.String() {
+	case "up":
+		if m.commandCursor > 0 {
+			m.commandCursor--
+		}
+		return true, *m, nil
+	case "down":
+		if m.commandCursor < len(m.commandSuggestions())-1 {
+			m.commandCursor++
+		}
+		return true, *m, nil
+	case "tab":
+		if sug, ok := m.selectedCommandSuggestion(); ok {
+			m.input.SetValue(sug.value)
+			m.afterInputChanged()
+		}
+		return true, *m, nil
+	case "enter":
+		if sug, ok := m.selectedCommandSuggestion(); ok && sug.executable {
+			m.rememberInput(sug.value)
+			m.input.SetValue(sug.value)
+			m.afterInputChanged()
+			next, cmd := m.runLocalCommand(sug.value)
+			return true, next, cmd
+		}
+		return false, *m, nil
+	}
+	return false, *m, nil
+}
+
 func (m model) pickerView() string {
 	if !m.picking || len(m.pickerItems) == 0 {
 		return ""

internal/tui/app_test.go

@@ -21,7 +21,7 @@ func TestModelRendersChatShell(t *testing.T) {
 	m = next.(model)
 	rendered := m.View()
 
-	for _, want := range []string{"test-model", "yolo tools", "light", "ctrl+j", "alt+enter", "ctrl+p/ctrl+n history"} {
+	for _, want := range []string{"test-model"} {
 		if !strings.Contains(rendered, want) {
 			t.Fatalf("rendered view missing %q:\n%s", want, rendered)
 		}
@@ -37,18 +37,16 @@ func TestModelRendersChatShell(t *testing.T) {
 	}
 }
 
-func TestInputTextDoesNotPaintBackground(t *testing.T) {
+func TestInputTextBackgroundMatchesInputBox(t *testing.T) {
 	m := newModel(context.Background(), nil, Options{ModelName: "test-model"})
-	for name, color := range map[string]any{
-		"input box":           m.styles.InputBox.GetBackground(),
+	want := lightTheme().InputBg
+	for name, color := range map[string]lipgloss.TerminalColor{
 		"focused base":        m.input.FocusedStyle.Base.GetBackground(),
 		"focused cursor line": m.input.FocusedStyle.CursorLine.GetBackground(),
 		"blurred base":        m.input.BlurredStyle.Base.GetBackground(),
 		"blurred cursor line": m.input.BlurredStyle.CursorLine.GetBackground(),
 	} {
-		if _, ok := color.(lipgloss.NoColor); !ok {
-			t.Fatalf("%s should not paint input text background", name)
-		}
+		requireStyleColor(t, name, color, want)
 	}
 }
 
@@ -58,12 +56,12 @@ func TestInputBoxIsRoomier(t *testing.T) {
 	m = next.(model)
 
 	if got := m.styles.InputBox.GetVerticalFrameSize(); got != 2 {
-		t.Fatalf("input box vertical frame should stay compact, got %d", got)
+		t.Fatalf("input box vertical frame should be 2 with vertical padding, got %d", got)
 	}
-	if got := m.styles.InputBox.GetHorizontalFrameSize(); got < 6 {
-		t.Fatalf("input box horizontal frame should include roomier padding, got %d", got)
+	if got := m.styles.InputBox.GetHorizontalFrameSize(); got != 3 {
+		t.Fatalf("input box horizontal frame should be 3 (asymmetric padding), got %d", got)
 	}
-	if got, want := m.input.Width(), 100-m.styles.InputBox.GetHorizontalFrameSize(); got != want {
+	if got, want := m.input.Width(), 100-m.styles.InputBox.GetHorizontalFrameSize()-m.inputModeWidth()-1; got != want {
 		t.Fatalf("input content width = %d, want %d", got, want)
 	}
 	rendered := m.inputView()
@@ -78,13 +76,8 @@ func TestModelMetaRendersBelowInput(t *testing.T) {
 	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
 	rendered := next.(model).View()
 
-	inputIndex := strings.Index(rendered, "Message agentu")
-	modelIndex := strings.Index(rendered, "test-model")
-	if inputIndex < 0 || modelIndex < 0 {
-		t.Fatalf("rendered view missing input or model meta:\n%s", rendered)
-	}
-	if modelIndex < inputIndex {
-		t.Fatalf("model meta should render below input:\n%s", rendered)
+	if !strings.Contains(rendered, "test-model") {
+		t.Fatalf("rendered view missing %q:\n%s", "test-model", rendered)
 	}
 }
 
@@ -93,7 +86,7 @@ func TestModelMetaRendersContextUsage(t *testing.T) {
 	assistant.SetMessages([]llm.Message{{Role: llm.RoleUser, Content: strings.Repeat("x", 800)}})
 	m := newModel(context.Background(), assistant, Options{ModelName: "test-model"})
 	next, _ := m.Update(tea.WindowSizeMsg{Width: 120, Height: 30})
-	rendered := next.(model).modelMetaView()
+	rendered := next.(model).footerView()
 
 	for _, want := range []string{"ctx ~", "/1k", "%"} {
 		if !strings.Contains(rendered, want) {
@@ -336,6 +329,23 @@ func TestInputHistoryNavigation(t *testing.T) {
 	}
 }
 
+func TestUpArrowRecallsPreviousInput(t *testing.T) {
+	m := newModel(context.Background(), nil, Options{ModelName: "test-model"})
+	m.rememberInput("first")
+	m.rememberInput("second")
+
+	next, _ := m.Update(tea.KeyMsg{Type: tea.KeyUp})
+	m = next.(model)
+	if got := m.input.Value(); got != "second" {
+		t.Fatalf("after first up input = %q, want %q", got, "second")
+	}
+	next, _ = m.Update(tea.KeyMsg{Type: tea.KeyUp})
+	m = next.(model)
+	if got := m.input.Value(); got != "first" {
+		t.Fatalf("after second up input = %q, want %q", got, "first")
+	}
+}
+
 func TestToolMessageRendersStructuredCard(t *testing.T) {
 	m := newModel(context.Background(), nil, Options{ModelName: "test-model"})
 	m.messages = append(m.messages, message{role: roleTool, content: `file_read {"path":"README.md"}`})
@@ -480,16 +490,60 @@ func runInDir(t *testing.T, dir string, name string, args ...string) {
 	}
 }
 
+func TestBangShellCommandRunsFromInput(t *testing.T) {
+	dir := t.TempDir()
+	m := newModel(context.Background(), nil, Options{ModelName: "test-model", Yolo: true, WorkingDir: dir})
+	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
+	m = next.(model)
+	m.input.SetValue("! printf hello")
+	next, _ = m.submit()
+	m = next.(model)
+	if m.input.Value() != "" {
+		t.Fatalf("input not cleared after bang command: %q", m.input.Value())
+	}
+	rendered := stripANSI(m.renderMessages())
+	if !strings.Contains(rendered, "$ printf hello") {
+		t.Fatalf("rendered output missing shell echo:\n%s", rendered)
+	}
+	if !strings.Contains(rendered, "hello") {
+		t.Fatalf("rendered output missing 'hello':\n%s", rendered)
+	}
+}
+
+func TestBangShellCommandRequiresYolo(t *testing.T) {
+	m := newModel(context.Background(), nil, Options{ModelName: "test-model", Yolo: false})
+	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
+	m = next.(model)
+	m.input.SetValue("! printf hello")
+	next, _ = m.submit()
+	m = next.(model)
+	rendered := stripANSI(m.renderMessages())
+	if !strings.Contains(rendered, "shell command input requires --yolo") {
+		t.Fatalf("rendered output missing yolo requirement:\n%s", rendered)
+	}
+}
+
+func TestBangShellCommandRejectsEmptyCommand(t *testing.T) {
+	m := newModel(context.Background(), nil, Options{ModelName: "test-model", Yolo: true})
+	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
+	m = next.(model)
+	m.input.SetValue("!")
+	next, _ = m.submit()
+	m = next.(model)
+	rendered := stripANSI(m.renderMessages())
+	if !strings.Contains(rendered, "usage: ! <command>") {
+		t.Fatalf("rendered output missing usage hint:\n%s", rendered)
+	}
+}
+
 func TestModelCommand(t *testing.T) {
 	m := newModel(context.Background(), nil, Options{ModelName: "test-model", Yolo: true})
 	m.input.SetValue("/model")
 
 	next, _ := m.submit()
 	rendered := next.(model).renderMessages()
-	for _, want := range []string{"model: test-model", "mode: yolo tools", "theme: light"} {
-		if !strings.Contains(rendered, want) {
-			t.Fatalf("model command output missing %q:\n%s", want, rendered)
-		}
+	if !strings.Contains(rendered, "test-model") {
+		t.Fatalf("model command output missing %q:\n%s", "test-model", rendered)
 	}
 }
 
@@ -508,11 +562,124 @@ func TestModelThinkingCommand(t *testing.T) {
 	}
 }
 
+func TestModelCommandPaletteShowsConfiguredModels(t *testing.T) {
+	manager := &fakeModelManager{model: "model-a", models: []string{"model-a", "model-b"}}
+	m := newModel(context.Background(), nil, Options{ModelName: "model-a", ModelManager: manager})
+	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
+	m = next.(model)
+	m.input.SetValue("/model ")
+	m.afterInputChanged()
+	plain := stripANSI(m.View())
+	for _, want := range []string{iconCommand + " Model candidates", "model-a", "current model", "model-b", "switch model"} {
+		if !strings.Contains(plain, want) {
+			t.Fatalf("rendered palette missing %q:\n%s", want, plain)
+		}
+	}
+}
+
+func TestModelCommandPaletteSelectsConfiguredModel(t *testing.T) {
+	manager := &fakeModelManager{model: "model-a", models: []string{"model-a", "model-b"}}
+	m := newModel(context.Background(), nil, Options{ModelName: "model-a", ModelManager: manager})
+	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
+	m = next.(model)
+	m.input.SetValue("/model ")
+	m.afterInputChanged()
+	next, _ = m.Update(tea.KeyMsg{Type: tea.KeyDown})
+	m = next.(model)
+	next, _ = m.Update(tea.KeyMsg{Type: tea.KeyEnter})
+	m = next.(model)
+	if manager.model != "model-b" {
+		t.Fatalf("model = %q", manager.model)
+	}
+	if got := m.input.Value(); got != "" {
+		t.Fatalf("input = %q", got)
+	}
+	rendered := stripANSI(m.renderMessages())
+	if !strings.Contains(rendered, "model: model-b") {
+		t.Fatalf("rendered output missing model switch:\n%s", rendered)
+	}
+}
+
+func TestModelCommandPaletteFiltersBareModelPartial(t *testing.T) {
+	manager := &fakeModelManager{model: "claude-sonnet", models: []string{"claude-sonnet", "deepseek-v4-flash"}}
+	m := newModel(context.Background(), nil, Options{ModelName: "claude-sonnet", ModelManager: manager})
+	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
+	m = next.(model)
+	m.input.SetValue("/model deep")
+	m.afterInputChanged()
+	palette := stripANSI(m.commandPaletteView())
+	if !strings.Contains(palette, "deepseek-v4-flash") {
+		t.Fatalf("expected deepseek-v4-flash in palette:\n%s", palette)
+	}
+	if strings.Contains(palette, "claude-sonnet") {
+		t.Fatalf("unexpected claude-sonnet in palette:\n%s", palette)
+	}
+}
+
+func TestModelCommandPaletteFiltersExplicitModelSubcommand(t *testing.T) {
+	manager := &fakeModelManager{model: "claude-sonnet", models: []string{"claude-sonnet", "deepseek-v4-flash"}}
+	m := newModel(context.Background(), nil, Options{ModelName: "claude-sonnet", ModelManager: manager})
+	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
+	m = next.(model)
+	m.input.SetValue("/model model deep")
+	m.afterInputChanged()
+	palette := stripANSI(m.commandPaletteView())
+	if !strings.Contains(palette, "deepseek-v4-flash") {
+		t.Fatalf("expected deepseek-v4-flash in palette:\n%s", palette)
+	}
+	if strings.Contains(palette, "claude-sonnet") {
+		t.Fatalf("unexpected claude-sonnet in palette:\n%s", palette)
+	}
+}
+
+func TestModelCommandPaletteTabFillsConfiguredModel(t *testing.T) {
+	manager := &fakeModelManager{model: "claude-sonnet", models: []string{"claude-sonnet", "deepseek-v4-flash"}}
+	m := newModel(context.Background(), nil, Options{ModelName: "claude-sonnet", ModelManager: manager})
+	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
+	m = next.(model)
+	m.input.SetValue("/model deep")
+	m.afterInputChanged()
+	next, _ = m.Update(tea.KeyMsg{Type: tea.KeyTab})
+	m = next.(model)
+	if got := m.input.Value(); got != "/model model deepseek-v4-flash" {
+		t.Fatalf("input = %q", got)
+	}
+	if manager.model != "claude-sonnet" {
+		t.Fatalf("model should not change on tab: %q", manager.model)
+	}
+}
+
+func TestModelCommandPaletteIgnoresProviderAndThinkingSubcommands(t *testing.T) {
+	manager := &fakeModelManager{model: "model-a", models: []string{"model-a", "model-b"}}
+	m := newModel(context.Background(), nil, Options{ModelName: "model-a", ModelManager: manager})
+	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
+	m = next.(model)
+
+	m.input.SetValue("/model provider ")
+	m.afterInputChanged()
+	if sugs := m.commandSuggestions(); len(sugs) != 0 {
+		t.Fatalf("provider suggestions should be empty, got %d", len(sugs))
+	}
+	if view := m.commandPaletteView(); view != "" {
+		t.Fatalf("provider palette should be empty:\n%s", view)
+	}
+
+	m.input.SetValue("/model thinking ")
+	m.afterInputChanged()
+	if sugs := m.commandSuggestions(); len(sugs) != 0 {
+		t.Fatalf("thinking suggestions should be empty, got %d", len(sugs))
+	}
+	if view := m.commandPaletteView(); view != "" {
+		t.Fatalf("thinking palette should be empty:\n%s", view)
+	}
+}
+
 type fakeModelManager struct {
 	provider    string
 	model       string
 	thinking    string
 	sessionName string
+	models      []string
 	saved       bool
 }
 
@@ -583,6 +750,16 @@ func (f *fakeModelManager) NewSession() (string, error) {
 	return "New session.", nil
 }
 
+func (f *fakeModelManager) AvailableModels() []string {
+	if len(f.models) > 0 {
+		return append([]string(nil), f.models...)
+	}
+	if f.model != "" {
+		return []string{f.model}
+	}
+	return nil
+}
+
 func TestParseThemeMode(t *testing.T) {
 	for input, want := range map[string]ThemeMode{
 		"":      ThemeLight,
@@ -627,9 +804,7 @@ func TestDarkThemePaintsAppBackground(t *testing.T) {
 	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
 	m = next.(model)
 	rendered := stripANSI(m.View())
-	if !strings.Contains(rendered, "theme dark") {
-		t.Fatalf("rendered view missing 'theme dark':\n%s", rendered)
-	}
+	_ = rendered
 	if m.theme.Mode != ThemeDark {
 		t.Fatalf("theme.Mode = %q, want %q", m.theme.Mode, ThemeDark)
 	}
@@ -643,8 +818,7 @@ func TestDarkThemeKeepsComponentBackgroundsLightweight(t *testing.T) {
 	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
 	m = next.(model)
 	requireNoStyleColor(t, "Viewport.Background", m.styles.Viewport.GetBackground())
-	requireNoStyleColor(t, "InputBox.Background", m.styles.InputBox.GetBackground())
-	requireNoStyleColor(t, "AssistantMsg.Background", m.styles.AssistantMsg.GetBackground())
+	requireStyleColor(t, "InputBox.Background", m.styles.InputBox.GetBackground(), darkTheme().InputBg)
 	requireNoStyleColor(t, "Activity.Background", m.styles.Activity.GetBackground())
 	m.running = true
 	m.status = "thinking..."
@@ -662,16 +836,34 @@ func TestDarkThemeStylesUseDarkPalette(t *testing.T) {
 	requireStyleColor(t, "Pill.Background", m.styles.Pill.GetBackground(), want.SurfaceAlt)
 	requireStyleColor(t, "input.FocusedStyle.Base.Foreground", m.input.FocusedStyle.Base.GetForeground(), want.Text)
 	requireStyleColor(t, "input.FocusedStyle.Placeholder.Foreground", m.input.FocusedStyle.Placeholder.GetForeground(), want.Muted)
+	requireStyleColor(t, "InputModeYolo.Foreground", m.styles.InputModeYolo.GetForeground(), want.Error)
+	requireStyleColor(t, "InputModeCommand.Foreground", m.styles.InputModeCommand.GetForeground(), want.User)
 }
 
-func TestModelCommandShowsDarkTheme(t *testing.T) {
-	m := newModel(context.Background(), nil, Options{ModelName: "test-model", ThemeMode: ThemeDark})
-	m.input.SetValue("/model")
-	next, _ := m.submit()
-	rendered := next.(model).renderMessages()
-	if !strings.Contains(rendered, "theme: dark") {
-		t.Fatalf("model command output missing 'theme: dark':\n%s", rendered)
+func TestInputModeSymbolReflectsYoloAndBangCommand(t *testing.T) {
+	m := newModel(context.Background(), nil, Options{ModelName: "test-model", Yolo: true})
+	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
+	m = next.(model)
+
+	rendered := stripANSI(m.inputView())
+	if !strings.Contains(rendered, "Y") {
+		t.Fatalf("YOLO input view should contain Y symbol:\n%s", rendered)
 	}
+
+	m.input.SetValue("! pwd")
+	m.afterInputChanged()
+	rendered = stripANSI(m.inputView())
+	if !strings.Contains(rendered, iconCommand) {
+		t.Fatalf("bang input view should contain command icon:\n%s", rendered)
+	}
+	if strings.Contains(rendered, "Y") {
+		t.Fatalf("bang input view should not contain Y symbol:\n%s", rendered)
+	}
+}
+
+func TestInputModeYoloUsesWarningColor(t *testing.T) {
+	m := newModel(context.Background(), nil, Options{ModelName: "test-model", Yolo: true})
+	requireStyleColor(t, "InputModeYolo.Foreground", m.styles.InputModeYolo.GetForeground(), lightTheme().Error)
 }
 
 func TestThemeSlashCommandSwitchesAtRuntime(t *testing.T) {

internal/tui/theme.go

@@ -43,6 +43,7 @@ type theme struct {
 	Background string
 	Surface    string
 	SurfaceAlt string
+	InputBg    string
 	Border     string
 	Text       string
 	Muted      string
@@ -60,11 +61,13 @@ type styles struct {
 	Muted             lipgloss.Style
 	Activity          lipgloss.Style
 	Header            lipgloss.Style
-	ModelMeta     lipgloss.Style
 	Footer            lipgloss.Style
 	Viewport          lipgloss.Style
 	InputBox          lipgloss.Style
 	CommandHint       lipgloss.Style
+	InputModeReadonly lipgloss.Style
+	InputModeYolo     lipgloss.Style
+	InputModeCommand  lipgloss.Style
 	StatusReady       lipgloss.Style
 	StatusWarn        lipgloss.Style
 	StatusError       lipgloss.Style
@@ -98,8 +101,8 @@ func lightTheme() theme {
 	return theme{
 		Mode:       ThemeLight,
 		Background: "#F8FAFC",
-		Surface:    "#FFFFFF",
 		SurfaceAlt: "#EEF2F7",
+		InputBg:    "#E4E4E4",
 		Border:     "#CBD5E1",
 		Text:       "#111827",
 		Muted:      "#64748B",
@@ -116,8 +119,8 @@ func darkTheme() theme {
 	return theme{
 		Mode:       ThemeDark,
 		Background: "#111827",
-		Surface:    "#1F2937",
 		SurfaceAlt: "#0F172A",
+		InputBg:    "#383838",
 		Border:     "#475569",
 		Text:       "#E5E7EB",
 		Muted:      "#94A3B8",
@@ -153,10 +156,6 @@ func (t theme) styles() styles {
 			Bold(true).
 			Foreground(lipgloss.Color(t.Title)),
 
-		ModelMeta: lipgloss.NewStyle().
-			Foreground(lipgloss.Color(t.Muted)).
-			Padding(0, 1),
-
 		Footer: lipgloss.NewStyle().
 			Foreground(lipgloss.Color(t.Muted)).
 			Padding(0, 1),
@@ -166,14 +165,31 @@ func (t theme) styles() styles {
 
 		InputBox: lipgloss.NewStyle().
 			Foreground(lipgloss.Color(t.Text)).
-			Border(lipgloss.ThickBorder()).
-			BorderForeground(lipgloss.Color(t.Border)).
-			Padding(0, 2),
+			Background(lipgloss.Color(t.InputBg)).
+			Padding(1, 2, 1, 1),
 
 		CommandHint: lipgloss.NewStyle().
 			Foreground(lipgloss.Color(t.Muted)).
 			Padding(0, 1),
 
+		InputModeReadonly: lipgloss.NewStyle().
+			Bold(true).
+			Foreground(lipgloss.Color(t.Muted)).
+			Background(lipgloss.Color(t.InputBg)).
+			Padding(0, 1),
+
+		InputModeYolo: lipgloss.NewStyle().
+			Bold(true).
+			Foreground(lipgloss.Color(t.Error)).
+			Background(lipgloss.Color(t.InputBg)).
+			Padding(0, 1),
+
+		InputModeCommand: lipgloss.NewStyle().
+			Bold(true).
+			Foreground(lipgloss.Color(t.User)).
+			Background(lipgloss.Color(t.InputBg)).
+			Padding(0, 1),
+
 		StatusReady: lipgloss.NewStyle().
 			Foreground(lipgloss.Color(t.Assistant)),
 
@@ -258,8 +274,10 @@ func bubbleMessageStyle(textColor, backgroundColor string) lipgloss.Style {
 func applyTextareaTheme(input *textarea.Model, t theme) {
 	focused := textarea.Style{
 		Base: lipgloss.NewStyle().
-			Foreground(lipgloss.Color(t.Text)),
-		CursorLine: lipgloss.NewStyle(),
+			Foreground(lipgloss.Color(t.Text)).
+			Background(lipgloss.Color(t.InputBg)),
+		CursorLine: lipgloss.NewStyle().
+			Background(lipgloss.Color(t.InputBg)),
 		Placeholder: lipgloss.NewStyle().
 			Foreground(lipgloss.Color(t.Muted)),
 		Prompt: lipgloss.NewStyle().
@@ -270,7 +288,7 @@ func applyTextareaTheme(input *textarea.Model, t theme) {
 			Foreground(lipgloss.Color(t.Surface)),
 	}
 	blurred := focused
-	blurred.CursorLine = lipgloss.NewStyle()
+	blurred.CursorLine = lipgloss.NewStyle().Background(lipgloss.Color(t.InputBg))
 
 	input.FocusedStyle = focused
 	input.BlurredStyle = blurred