diff --git a/packages/ui/src/components/settings-screen.tsx b/packages/ui/src/components/settings-screen.tsx
index 48fe45d1..f3776cbd 100644
--- a/packages/ui/src/components/settings-screen.tsx
+++ b/packages/ui/src/components/settings-screen.tsx
@@ -45,7 +45,6 @@ export const SettingsScreen: Component = () => {
         <div class="settings-screen-frame">
           <Dialog.Content class="modal-surface settings-screen-shell">
             <Dialog.Title class="sr-only">{t("settings.title")}</Dialog.Title>
-            <Dialog.Description class="sr-only">{t("settings.description")}</Dialog.Description>
 
             <aside class="settings-screen-nav">
               <div class="settings-screen-nav-header">
@@ -55,7 +54,6 @@ export const SettingsScreen: Component = () => {
                   </span>
                   <div>
                     <h2 class="settings-screen-title">{t("settings.title")}</h2>
-                    <p class="settings-screen-subtitle">{t("settings.description")}</p>
                   </div>
                 </div>
               </div>
diff --git a/packages/ui/src/components/settings/appearance-settings-section.tsx b/packages/ui/src/components/settings/appearance-settings-section.tsx
index e8e5df25..7a634160 100644
--- a/packages/ui/src/components/settings/appearance-settings-section.tsx
+++ b/packages/ui/src/components/settings/appearance-settings-section.tsx
@@ -1,7 +1,10 @@
-import type { Component } from "solid-js"
-import { Check, Laptop, Moon, Sun } from "lucide-solid"
+import { Select } from "@kobalte/core/select"
+import { createEffect, createMemo, createSignal, For, type Component } from "solid-js"
+import { Check, ChevronDown, Laptop, Moon, Sun } from "lucide-solid"
 import { useI18n } from "../../lib/i18n"
 import { useTheme, type ThemeMode } from "../../lib/theme"
+import { useConfig } from "../../stores/preferences"
+import { getBehaviorSettings, type BehaviorSetting } from "../../lib/settings/behavior-registry"
 
 const themeModeOptions: Array<{ value: ThemeMode; icon: typeof Laptop }> = [
   { value: "system", icon: Laptop },
@@ -12,6 +15,200 @@ const themeModeOptions: Array<{ value: ThemeMode; icon: typeof Laptop }> = [
 export const AppearanceSettingsSection: Component = () => {
   const { t } = useI18n()
   const { themeMode, setThemeMode } = useTheme()
+  const {
+    preferences,
+    updatePreferences,
+    toggleShowThinkingBlocks,
+    toggleKeyboardShortcutHints,
+    toggleShowTimelineTools,
+    toggleUsageMetrics,
+    toggleAutoCleanupBlankSessions,
+    togglePromptSubmitOnEnter,
+    setDiffViewMode,
+    setToolOutputExpansion,
+    setDiagnosticsExpansion,
+    setThinkingBlocksExpansion,
+    setToolInputsVisibility,
+  } = useConfig()
+
+  const behaviorSettings = createMemo(() =>
+    getBehaviorSettings({
+      preferences,
+      updatePreferences,
+      toggleShowThinkingBlocks,
+      toggleKeyboardShortcutHints,
+      toggleShowTimelineTools,
+      toggleUsageMetrics,
+      toggleAutoCleanupBlankSessions,
+      togglePromptSubmitOnEnter,
+      setDiffViewMode,
+      setToolOutputExpansion,
+      setDiagnosticsExpansion,
+      setThinkingBlocksExpansion,
+      setToolInputsVisibility,
+    }),
+  )
+
+  const [overrides, setOverrides] = createSignal<Map<string, unknown>>(new Map())
+
+  const setOverride = (id: string, value: unknown) => {
+    setOverrides((prev) => {
+      const next = new Map(prev)
+      next.set(id, value)
+      return next
+    })
+  }
+
+  createEffect(() => {
+    const current = overrides()
+    if (current.size === 0) return
+
+    const prefs = preferences()
+    const settings = behaviorSettings()
+
+    let changed = false
+    const next = new Map(current)
+    for (const setting of settings) {
+      if (!next.has(setting.id)) continue
+      const overrideValue = next.get(setting.id)
+      const actualValue = setting.get(prefs)
+      if (Object.is(actualValue, overrideValue)) {
+        next.delete(setting.id)
+        changed = true
+      }
+    }
+
+    if (changed) {
+      setOverrides(next)
+    }
+  })
+
+  const readSettingValue = (setting: BehaviorSetting) => {
+    const current = overrides()
+    if (current.has(setting.id)) return current.get(setting.id)
+    return setting.get(preferences())
+  }
+
+  type SelectOption = { value: string; label: string }
+
+  const BehaviorRow: Component<{ setting: BehaviorSetting }> = (props) => {
+    const setting = props.setting
+    const disabled = createMemo(() => (setting.disabled ? Boolean(setting.disabled()) : false))
+
+    if (setting.kind === "toggle") {
+      const options = createMemo<SelectOption[]>(() => [
+        { value: "true", label: t("settings.common.enabled") },
+        { value: "false", label: t("settings.common.disabled") },
+      ])
+      const currentValue = createMemo(() => String(Boolean(readSettingValue(setting))))
+      const selectedOption = createMemo(() => options().find((opt) => opt.value === currentValue()))
+
+      return (
+        <div class={`settings-toggle-row ${disabled() ? "opacity-60" : ""}`}>
+          <div>
+            <div class="settings-toggle-title">{t(setting.titleKey)}</div>
+            <div class="settings-toggle-caption">{t(setting.subtitleKey)}</div>
+          </div>
+          <Select<SelectOption>
+            value={selectedOption()}
+            onChange={(opt) => {
+              if (!opt) return
+              const next = opt.value === "true"
+              setOverride(setting.id, next)
+              setting.set(next)
+            }}
+            options={options()}
+            optionValue="value"
+            optionTextValue="label"
+            disabled={disabled()}
+            itemComponent={(itemProps) => (
+              <Select.Item item={itemProps.item} class="selector-option">
+                <Select.ItemLabel class="selector-option-label">{itemProps.item.rawValue.label}</Select.ItemLabel>
+              </Select.Item>
+            )}
+          >
+            <Select.Trigger class="selector-trigger" aria-label={t(setting.titleKey)}>
+              <div class="flex-1 min-w-0">
+                <Select.Value<SelectOption>>
+                  {(state) => (
+                    <span class="selector-trigger-primary selector-trigger-primary--align-left">
+                      {state.selectedOption()?.label}
+                    </span>
+                  )}
+                </Select.Value>
+              </div>
+              <Select.Icon class="selector-trigger-icon">
+                <ChevronDown class="w-3 h-3" />
+              </Select.Icon>
+            </Select.Trigger>
+
+            <Select.Portal>
+              <Select.Content class="selector-popover">
+                <Select.Listbox class="selector-listbox" />
+              </Select.Content>
+            </Select.Portal>
+          </Select>
+        </div>
+      )
+    }
+
+    const enumSetting = setting as Extract<BehaviorSetting, { kind: "enum" }>
+    const options = createMemo<SelectOption[]>(() =>
+      enumSetting.options.map((opt: { value: string; labelKey: string }) => ({
+        value: String(opt.value),
+        label: t(opt.labelKey),
+      })),
+    )
+    const currentValue = createMemo(() => String(readSettingValue(setting) ?? ""))
+    const selectedOption = createMemo(() => options().find((opt) => opt.value === currentValue()))
+
+    return (
+      <div class={`settings-toggle-row ${disabled() ? "opacity-60" : ""}`}>
+        <div>
+          <div class="settings-toggle-title">{t(setting.titleKey)}</div>
+          <div class="settings-toggle-caption">{t(setting.subtitleKey)}</div>
+        </div>
+        <Select<SelectOption>
+          value={selectedOption()}
+          onChange={(opt) => {
+            if (!opt) return
+            setOverride(setting.id, opt.value)
+            enumSetting.set(opt.value as any)
+          }}
+          options={options()}
+          optionValue="value"
+          optionTextValue="label"
+          disabled={disabled()}
+          itemComponent={(itemProps) => (
+            <Select.Item item={itemProps.item} class="selector-option">
+              <Select.ItemLabel class="selector-option-label">{itemProps.item.rawValue.label}</Select.ItemLabel>
+            </Select.Item>
+          )}
+        >
+          <Select.Trigger class="selector-trigger" aria-label={t(setting.titleKey)}>
+            <div class="flex-1 min-w-0">
+              <Select.Value<SelectOption>>
+                {(state) => (
+                  <span class="selector-trigger-primary selector-trigger-primary--align-left">
+                    {state.selectedOption()?.label}
+                  </span>
+                )}
+              </Select.Value>
+            </div>
+            <Select.Icon class="selector-trigger-icon">
+              <ChevronDown class="w-3 h-3" />
+            </Select.Icon>
+          </Select.Trigger>
+
+          <Select.Portal>
+            <Select.Content class="selector-popover">
+              <Select.Listbox class="selector-listbox" />
+            </Select.Content>
+          </Select.Portal>
+        </Select>
+      </div>
+    )
+  }
 
   const modeLabel = (mode: ThemeMode) => {
     if (mode === "system") return t("theme.mode.system")
@@ -54,6 +251,20 @@ export const AppearanceSettingsSection: Component = () => {
           })}
         </div>
       </div>
+
+      <div class="settings-card">
+        <div class="settings-card-header">
+          <div>
+            <h3 class="settings-card-title">{t("settings.appearance.behavior.title")}</h3>
+            <p class="settings-card-subtitle">{t("settings.appearance.behavior.subtitle")}</p>
+          </div>
+          <span class="settings-scope-badge">{t("settings.scope.device")}</span>
+        </div>
+
+        <div class="settings-stack">
+          <For each={behaviorSettings()}>{(setting) => <BehaviorRow setting={setting} />}</For>
+        </div>
+      </div>
     </div>
   )
 }
diff --git a/packages/ui/src/lib/hooks/use-commands.ts b/packages/ui/src/lib/hooks/use-commands.ts
index 4105e274..a74fc840 100644
--- a/packages/ui/src/lib/hooks/use-commands.ts
+++ b/packages/ui/src/lib/hooks/use-commands.ts
@@ -14,7 +14,7 @@ import { getLogger } from "../logger"
 import { requestData } from "../opencode-api"
 import { emitSessionSidebarRequest } from "../session-sidebar-events"
 import { tGlobal } from "../i18n"
-import { runtimeEnv } from "../runtime-env"
+import { registerBehaviorCommands } from "../settings/behavior-registry"
 
 const log = getLogger("actions")
 
@@ -427,178 +427,19 @@ export function useCommands(options: UseCommandsOptions) {
       },
     })
 
-    commandRegistry.register({
-      id: "prompt-submit-shortcut",
-      label: () =>
-        options.preferences().promptSubmitOnEnter
-          ? tGlobal("commands.promptSubmitShortcut.label.swapped")
-          : tGlobal("commands.promptSubmitShortcut.label.default"),
-      description: () => tGlobal("commands.promptSubmitShortcut.description"),
-      category: "Input & Focus",
-      keywords: () => splitKeywords("commands.promptSubmitShortcut.keywords"),
-      action: options.togglePromptSubmitOnEnter,
-    })
-
-    commandRegistry.register({
-      id: "thinking",
-      label: () => tGlobal(options.preferences().showThinkingBlocks ? "commands.thinkingBlocks.label.hide" : "commands.thinkingBlocks.label.show"),
-      description: () => tGlobal("commands.thinkingBlocks.description"),
-      category: "System",
-      keywords: () => ["/thinking", ...splitKeywords("commands.thinkingBlocks.keywords")],
-      action: options.toggleShowThinkingBlocks,
-    })
-
-    commandRegistry.register({
-      id: "timeline-tools",
-      label: () => tGlobal(options.preferences().showTimelineTools ? "commands.timelineToolCalls.label.hide" : "commands.timelineToolCalls.label.show"),
-      description: () => tGlobal("commands.timelineToolCalls.description"),
-      category: "System",
-      keywords: () => splitKeywords("commands.timelineToolCalls.keywords"),
-      action: options.toggleShowTimelineTools,
-    })
-
-    commandRegistry.register({
-      id: "keyboard-shortcut-hints",
-      label: () =>
-        tGlobal(
-          options.preferences().showKeyboardShortcutHints
-            ? "commands.keyboardShortcutHints.label.hide"
-            : "commands.keyboardShortcutHints.label.show",
-        ),
-      description: () =>
-        tGlobal(
-          runtimeEnv.host === "web"
-            ? "commands.keyboardShortcutHints.description.disabledWeb"
-            : "commands.keyboardShortcutHints.description",
-        ),
-      category: "System",
-      keywords: () => splitKeywords("commands.keyboardShortcutHints.keywords"),
-      disabled: () => runtimeEnv.host === "web",
-      action: options.toggleKeyboardShortcutHints,
-    })
-
-    commandRegistry.register({
-      id: "thinking-default-visibility",
-      label: () => {
-        const mode = options.preferences().thinkingBlocksExpansion ?? "expanded"
-        const state = mode === "expanded" ? tGlobal("commands.common.expanded") : tGlobal("commands.common.collapsed")
-        return tGlobal("commands.thinkingBlocksDefault.label", { state })
-      },
-      description: () => tGlobal("commands.thinkingBlocksDefault.description"),
-      category: "System",
-      keywords: () => ["/thinking", ...splitKeywords("commands.thinkingBlocksDefault.keywords")],
-      action: () => {
-        const mode = options.preferences().thinkingBlocksExpansion ?? "expanded"
-        const next: ExpansionPreference = mode === "expanded" ? "collapsed" : "expanded"
-        options.setThinkingBlocksExpansion(next)
-      },
-    })
-
-    commandRegistry.register({
-      id: "diff-view-split",
-      label: () => {
-        const prefix = (options.preferences().diffViewMode || "split") === "split" ? "✓ " : ""
-        return `${prefix}${tGlobal("commands.diffViewSplit.label")}`
-      },
-      description: () => tGlobal("commands.diffViewSplit.description"),
-      category: "System",
-      keywords: () => splitKeywords("commands.diffViewSplit.keywords"),
-      action: () => options.setDiffViewMode("split"),
-    })
-
-    commandRegistry.register({
-      id: "diff-view-unified",
-      label: () => {
-        const prefix = (options.preferences().diffViewMode || "split") === "unified" ? "✓ " : ""
-        return `${prefix}${tGlobal("commands.diffViewUnified.label")}`
-      },
-      description: () => tGlobal("commands.diffViewUnified.description"),
-      category: "System",
-      keywords: () => splitKeywords("commands.diffViewUnified.keywords"),
-      action: () => options.setDiffViewMode("unified"),
-    })
-
-    commandRegistry.register({
-      id: "tool-output-default-visibility",
-      label: () => {
-        const mode = options.preferences().toolOutputExpansion || "expanded"
-        const state = mode === "expanded" ? tGlobal("commands.common.expanded") : tGlobal("commands.common.collapsed")
-        return tGlobal("commands.toolOutputsDefault.label", { state })
-      },
-      description: () => tGlobal("commands.toolOutputsDefault.description"),
-      category: "System",
-      keywords: () => splitKeywords("commands.toolOutputsDefault.keywords"),
-      action: () => {
-        const mode = options.preferences().toolOutputExpansion || "expanded"
-        const next: ExpansionPreference = mode === "expanded" ? "collapsed" : "expanded"
-        options.setToolOutputExpansion(next)
-      },
-    })
-
-    commandRegistry.register({
-      id: "diagnostics-default-visibility",
-      label: () => {
-        const mode = options.preferences().diagnosticsExpansion || "expanded"
-        const state = mode === "expanded" ? tGlobal("commands.common.expanded") : tGlobal("commands.common.collapsed")
-        return tGlobal("commands.diagnosticsDefault.label", { state })
-      },
-      description: () => tGlobal("commands.diagnosticsDefault.description"),
-      category: "System",
-      keywords: () => splitKeywords("commands.diagnosticsDefault.keywords"),
-      action: () => {
-        const mode = options.preferences().diagnosticsExpansion || "expanded"
-        const next: ExpansionPreference = mode === "expanded" ? "collapsed" : "expanded"
-        options.setDiagnosticsExpansion(next)
-      },
-    })
-
-    commandRegistry.register({
-      id: "tool-inputs-visibility",
-      label: () => {
-        const mode = options.preferences().toolInputsVisibility || "hidden"
-        const state =
-          mode === "expanded"
-            ? tGlobal("commands.common.expanded")
-            : mode === "collapsed"
-              ? tGlobal("commands.common.collapsed")
-              : tGlobal("commands.common.hidden")
-        return tGlobal("commands.toolInputsVisibility.label", { state })
-      },
-      description: () => tGlobal("commands.toolInputsVisibility.description"),
-      category: "System",
-      keywords: () => splitKeywords("commands.toolInputsVisibility.keywords"),
-      action: () => {
-        const mode = options.preferences().toolInputsVisibility || "hidden"
-        const next: ToolInputsVisibilityPreference =
-          mode === "hidden" ? "collapsed" : mode === "collapsed" ? "expanded" : "hidden"
-        options.setToolInputsVisibility(next)
-      },
-    })
-
-    commandRegistry.register({
-      id: "token-usage-visibility",
-      label: () => {
-        const visible = options.preferences().showUsageMetrics ?? true
-        const state = visible ? tGlobal("commands.common.visible") : tGlobal("commands.common.hidden")
-        return tGlobal("commands.tokenUsageDisplay.label", { state })
-      },
-      description: () => tGlobal("commands.tokenUsageDisplay.description"),
-      category: "System",
-      keywords: () => splitKeywords("commands.tokenUsageDisplay.keywords"),
-      action: options.toggleUsageMetrics,
-    })
-
-    commandRegistry.register({
-      id: "auto-cleanup-blank-sessions",
-      label: () => {
-        const enabled = options.preferences().autoCleanupBlankSessions
-        const state = enabled ? tGlobal("commands.common.enabled") : tGlobal("commands.common.disabled")
-        return tGlobal("commands.autoCleanupBlankSessions.label", { state })
-      },
-      description: () => tGlobal("commands.autoCleanupBlankSessions.description"),
-      category: "System",
-      keywords: () => splitKeywords("commands.autoCleanupBlankSessions.keywords"),
-      action: options.toggleAutoCleanupBlankSessions,
+    registerBehaviorCommands((command) => commandRegistry.register(command), {
+      preferences: options.preferences,
+      toggleShowThinkingBlocks: options.toggleShowThinkingBlocks,
+      toggleKeyboardShortcutHints: options.toggleKeyboardShortcutHints,
+      toggleShowTimelineTools: options.toggleShowTimelineTools,
+      toggleUsageMetrics: options.toggleUsageMetrics,
+      toggleAutoCleanupBlankSessions: options.toggleAutoCleanupBlankSessions,
+      togglePromptSubmitOnEnter: options.togglePromptSubmitOnEnter,
+      setDiffViewMode: options.setDiffViewMode,
+      setToolOutputExpansion: options.setToolOutputExpansion,
+      setDiagnosticsExpansion: options.setDiagnosticsExpansion,
+      setThinkingBlocksExpansion: options.setThinkingBlocksExpansion,
+      setToolInputsVisibility: options.setToolInputsVisibility,
     })
  
     commandRegistry.register({
diff --git a/packages/ui/src/lib/i18n/messages/en/settings.ts b/packages/ui/src/lib/i18n/messages/en/settings.ts
index 47c7d990..cbf95000 100644
--- a/packages/ui/src/lib/i18n/messages/en/settings.ts
+++ b/packages/ui/src/lib/i18n/messages/en/settings.ts
@@ -57,7 +57,6 @@ export const settingsMessages = {
   "contextUsagePanel.unavailable": "--",
 
   "settings.title": "Settings",
-  "settings.description": "Manage appearance, notifications, remote access, and OpenCode runtime options.",
   "settings.navigationAriaLabel": "Settings sections",
   "settings.close": "Close settings",
   "settings.content.eyebrow": "Workspace preferences",
@@ -70,6 +69,7 @@ export const settingsMessages = {
   "settings.scope.device": "This device",
   "settings.scope.server": "Server setting",
   "settings.common.enabled": "Enabled",
+  "settings.common.disabled": "Disabled",
   "settings.section.appearance.title": "Appearance",
   "settings.section.appearance.subtitle": "Adjust how the app looks on this device.",
   "settings.appearance.theme.title": "Theme",
@@ -112,4 +112,31 @@ export const settingsMessages = {
   "settings.section.opencode.subtitle": "Choose the OpenCode binary and environment used for new instances.",
   "settings.opencode.runtime.title": "Runtime",
   "settings.opencode.runtime.subtitle": "Configure which OpenCode binary new instances launch with.",
+
+  "settings.appearance.behavior.title": "Interaction",
+  "settings.appearance.behavior.subtitle": "Message, diff, and input defaults.",
+  "settings.behavior.keyboardHints.title": "Keyboard shortcut hints",
+  "settings.behavior.keyboardHints.subtitle": "Show keyboard shortcut hints across the UI.",
+  "settings.behavior.thinking.title": "Thinking sections",
+  "settings.behavior.thinking.subtitle": "Show or hide AI thinking sections in messages.",
+  "settings.behavior.thinkingDefault.title": "Thinking default",
+  "settings.behavior.thinkingDefault.subtitle": "Choose whether thinking sections start expanded or collapsed.",
+  "settings.behavior.timelineTools.title": "Timeline tool calls",
+  "settings.behavior.timelineTools.subtitle": "Show or hide tool call entries in the message timeline.",
+  "settings.behavior.diffView.title": "Diff view",
+  "settings.behavior.diffView.subtitle": "Choose how tool-call diffs are displayed.",
+  "settings.behavior.diffView.option.split": "Split",
+  "settings.behavior.diffView.option.unified": "Unified",
+  "settings.behavior.toolOutputsDefault.title": "Tool outputs default",
+  "settings.behavior.toolOutputsDefault.subtitle": "Choose whether tool outputs start expanded or collapsed.",
+  "settings.behavior.diagnosticsDefault.title": "Diagnostics default",
+  "settings.behavior.diagnosticsDefault.subtitle": "Choose whether diagnostics output starts expanded or collapsed.",
+  "settings.behavior.toolInputsVisibility.title": "Tool inputs visibility",
+  "settings.behavior.toolInputsVisibility.subtitle": "Set default visibility for tool call input arguments.",
+  "settings.behavior.usageMetrics.title": "Token usage metrics",
+  "settings.behavior.usageMetrics.subtitle": "Show or hide token and cost stats for assistant messages.",
+  "settings.behavior.autoCleanup.title": "Auto-cleanup blank sessions",
+  "settings.behavior.autoCleanup.subtitle": "Automatically clean up blank sessions when creating new ones.",
+  "settings.behavior.promptSubmit.title": "Enter to submit",
+  "settings.behavior.promptSubmit.subtitle": "Use Enter to submit prompts; Cmd/Ctrl+Enter inserts a new line.",
 } as const
diff --git a/packages/ui/src/lib/i18n/messages/es/settings.ts b/packages/ui/src/lib/i18n/messages/es/settings.ts
index 750eff3e..8a9cbe6c 100644
--- a/packages/ui/src/lib/i18n/messages/es/settings.ts
+++ b/packages/ui/src/lib/i18n/messages/es/settings.ts
@@ -57,7 +57,6 @@ export const settingsMessages = {
   "contextUsagePanel.unavailable": "--",
 
   "settings.title": "Settings",
-  "settings.description": "Manage appearance, notifications, remote access, and OpenCode runtime options.",
   "settings.navigationAriaLabel": "Settings sections",
   "settings.close": "Close settings",
   "settings.content.eyebrow": "Workspace preferences",
@@ -70,6 +69,7 @@ export const settingsMessages = {
   "settings.scope.device": "This device",
   "settings.scope.server": "Server setting",
   "settings.common.enabled": "Enabled",
+  "settings.common.disabled": "Desactivado",
   "settings.section.appearance.title": "Appearance",
   "settings.section.appearance.subtitle": "Adjust how the app looks on this device.",
   "settings.appearance.theme.title": "Theme",
@@ -112,4 +112,31 @@ export const settingsMessages = {
   "settings.section.opencode.subtitle": "Choose the OpenCode binary and environment used for new instances.",
   "settings.opencode.runtime.title": "Runtime",
   "settings.opencode.runtime.subtitle": "Configure which OpenCode binary new instances launch with.",
+
+  "settings.appearance.behavior.title": "Interaccion",
+  "settings.appearance.behavior.subtitle": "Valores predeterminados de mensajes, diffs y entrada.",
+  "settings.behavior.keyboardHints.title": "Sugerencias de atajos de teclado",
+  "settings.behavior.keyboardHints.subtitle": "Muestra sugerencias de atajos de teclado en toda la interfaz.",
+  "settings.behavior.thinking.title": "Secciones de pensamiento",
+  "settings.behavior.thinking.subtitle": "Muestra u oculta las secciones de pensamiento de la IA en los mensajes.",
+  "settings.behavior.thinkingDefault.title": "Pensamiento por defecto",
+  "settings.behavior.thinkingDefault.subtitle": "Elige si las secciones de pensamiento comienzan expandidas o contraidas.",
+  "settings.behavior.timelineTools.title": "Llamadas de herramientas en la linea de tiempo",
+  "settings.behavior.timelineTools.subtitle": "Muestra u oculta entradas de llamadas de herramientas en la linea de tiempo de mensajes.",
+  "settings.behavior.diffView.title": "Vista de diferencias",
+  "settings.behavior.diffView.subtitle": "Elige como se muestran los diffs de llamadas de herramientas.",
+  "settings.behavior.diffView.option.split": "Dividida",
+  "settings.behavior.diffView.option.unified": "Unificada",
+  "settings.behavior.toolOutputsDefault.title": "Salidas de herramientas por defecto",
+  "settings.behavior.toolOutputsDefault.subtitle": "Elige si las salidas de herramientas comienzan expandidas o contraidas.",
+  "settings.behavior.diagnosticsDefault.title": "Diagnosticos por defecto",
+  "settings.behavior.diagnosticsDefault.subtitle": "Elige si la salida de diagnosticos comienza expandida o contraida.",
+  "settings.behavior.toolInputsVisibility.title": "Visibilidad de entradas de herramientas",
+  "settings.behavior.toolInputsVisibility.subtitle": "Establece la visibilidad por defecto de los argumentos de entrada de las llamadas de herramientas.",
+  "settings.behavior.usageMetrics.title": "Metricas de uso de tokens",
+  "settings.behavior.usageMetrics.subtitle": "Muestra u oculta estadisticas de tokens y costo en mensajes del asistente.",
+  "settings.behavior.autoCleanup.title": "Limpieza automatica de sesiones en blanco",
+  "settings.behavior.autoCleanup.subtitle": "Limpia automaticamente las sesiones en blanco al crear nuevas.",
+  "settings.behavior.promptSubmit.title": "Enter para enviar",
+  "settings.behavior.promptSubmit.subtitle": "Usa Enter para enviar; Cmd/Ctrl+Enter inserta una nueva linea.",
 } as const
diff --git a/packages/ui/src/lib/i18n/messages/fr/settings.ts b/packages/ui/src/lib/i18n/messages/fr/settings.ts
index 7139acaa..9a7009ba 100644
--- a/packages/ui/src/lib/i18n/messages/fr/settings.ts
+++ b/packages/ui/src/lib/i18n/messages/fr/settings.ts
@@ -57,7 +57,6 @@ export const settingsMessages = {
   "contextUsagePanel.unavailable": "--",
 
   "settings.title": "Settings",
-  "settings.description": "Manage appearance, notifications, remote access, and OpenCode runtime options.",
   "settings.navigationAriaLabel": "Settings sections",
   "settings.close": "Close settings",
   "settings.content.eyebrow": "Workspace preferences",
@@ -70,6 +69,7 @@ export const settingsMessages = {
   "settings.scope.device": "This device",
   "settings.scope.server": "Server setting",
   "settings.common.enabled": "Enabled",
+  "settings.common.disabled": "Desactive",
   "settings.section.appearance.title": "Appearance",
   "settings.section.appearance.subtitle": "Adjust how the app looks on this device.",
   "settings.appearance.theme.title": "Theme",
@@ -112,4 +112,31 @@ export const settingsMessages = {
   "settings.section.opencode.subtitle": "Choose the OpenCode binary and environment used for new instances.",
   "settings.opencode.runtime.title": "Runtime",
   "settings.opencode.runtime.subtitle": "Configure which OpenCode binary new instances launch with.",
+
+  "settings.appearance.behavior.title": "Interaction",
+  "settings.appearance.behavior.subtitle": "Parametres par defaut pour les messages, les diffs et la saisie.",
+  "settings.behavior.keyboardHints.title": "Indications de raccourcis clavier",
+  "settings.behavior.keyboardHints.subtitle": "Afficher des indications de raccourcis clavier dans toute l'interface.",
+  "settings.behavior.thinking.title": "Sections de reflexion",
+  "settings.behavior.thinking.subtitle": "Afficher ou masquer les sections de reflexion de l'IA dans les messages.",
+  "settings.behavior.thinkingDefault.title": "Etat initial de la reflexion",
+  "settings.behavior.thinkingDefault.subtitle": "Choisir si les sections de reflexion commencent developpees ou reduites.",
+  "settings.behavior.timelineTools.title": "Appels d'outils dans la chronologie",
+  "settings.behavior.timelineTools.subtitle": "Afficher ou masquer les entrees d'appels d'outils dans la chronologie des messages.",
+  "settings.behavior.diffView.title": "Vue du diff",
+  "settings.behavior.diffView.subtitle": "Choisir comment les diffs des appels d'outils sont affiches.",
+  "settings.behavior.diffView.option.split": "Scinde",
+  "settings.behavior.diffView.option.unified": "Unifie",
+  "settings.behavior.toolOutputsDefault.title": "Etat initial des sorties d'outils",
+  "settings.behavior.toolOutputsDefault.subtitle": "Choisir si les sorties d'outils commencent developpees ou reduites.",
+  "settings.behavior.diagnosticsDefault.title": "Etat initial des diagnostics",
+  "settings.behavior.diagnosticsDefault.subtitle": "Choisir si la sortie des diagnostics commence developpee ou reduite.",
+  "settings.behavior.toolInputsVisibility.title": "Visibilite des entrees d'outils",
+  "settings.behavior.toolInputsVisibility.subtitle": "Definir la visibilite par defaut des arguments d'entree des appels d'outils.",
+  "settings.behavior.usageMetrics.title": "Metriques d'utilisation des tokens",
+  "settings.behavior.usageMetrics.subtitle": "Afficher ou masquer les stats de tokens et de cout pour les messages de l'assistant.",
+  "settings.behavior.autoCleanup.title": "Nettoyage auto des sessions vides",
+  "settings.behavior.autoCleanup.subtitle": "Nettoyer automatiquement les sessions vides lors de la creation de nouvelles.",
+  "settings.behavior.promptSubmit.title": "Entrer pour envoyer",
+  "settings.behavior.promptSubmit.subtitle": "Utiliser Entrer pour envoyer; Cmd/Ctrl+Entrer insere une nouvelle ligne.",
 } as const
diff --git a/packages/ui/src/lib/i18n/messages/ja/settings.ts b/packages/ui/src/lib/i18n/messages/ja/settings.ts
index 6cf894c0..6bc70aab 100644
--- a/packages/ui/src/lib/i18n/messages/ja/settings.ts
+++ b/packages/ui/src/lib/i18n/messages/ja/settings.ts
@@ -57,7 +57,6 @@ export const settingsMessages = {
   "contextUsagePanel.unavailable": "--",
 
   "settings.title": "Settings",
-  "settings.description": "Manage appearance, notifications, remote access, and OpenCode runtime options.",
   "settings.navigationAriaLabel": "Settings sections",
   "settings.close": "Close settings",
   "settings.content.eyebrow": "Workspace preferences",
@@ -70,6 +69,7 @@ export const settingsMessages = {
   "settings.scope.device": "This device",
   "settings.scope.server": "Server setting",
   "settings.common.enabled": "Enabled",
+  "settings.common.disabled": "無効",
   "settings.section.appearance.title": "Appearance",
   "settings.section.appearance.subtitle": "Adjust how the app looks on this device.",
   "settings.appearance.theme.title": "Theme",
@@ -112,4 +112,31 @@ export const settingsMessages = {
   "settings.section.opencode.subtitle": "Choose the OpenCode binary and environment used for new instances.",
   "settings.opencode.runtime.title": "Runtime",
   "settings.opencode.runtime.subtitle": "Configure which OpenCode binary new instances launch with.",
+
+  "settings.appearance.behavior.title": "操作",
+  "settings.appearance.behavior.subtitle": "メッセージ、差分、入力の既定値。",
+  "settings.behavior.keyboardHints.title": "キーボードショートカットのヒント",
+  "settings.behavior.keyboardHints.subtitle": "UI全体でキーボードショートカットのヒントを表示します。",
+  "settings.behavior.thinking.title": "思考セクション",
+  "settings.behavior.thinking.subtitle": "メッセージ内のAIの思考セクションを表示/非表示にします。",
+  "settings.behavior.thinkingDefault.title": "思考の既定",
+  "settings.behavior.thinkingDefault.subtitle": "思考セクションを最初に展開/折りたたみのどちらで表示するかを選びます。",
+  "settings.behavior.timelineTools.title": "タイムラインのツール呼び出し",
+  "settings.behavior.timelineTools.subtitle": "メッセージタイムラインでツール呼び出しを表示/非表示にします。",
+  "settings.behavior.diffView.title": "差分表示",
+  "settings.behavior.diffView.subtitle": "ツール呼び出しの差分の表示方法を選びます。",
+  "settings.behavior.diffView.option.split": "分割",
+  "settings.behavior.diffView.option.unified": "統合",
+  "settings.behavior.toolOutputsDefault.title": "ツール出力の既定",
+  "settings.behavior.toolOutputsDefault.subtitle": "ツール出力を最初に展開/折りたたみのどちらで表示するかを選びます。",
+  "settings.behavior.diagnosticsDefault.title": "診断の既定",
+  "settings.behavior.diagnosticsDefault.subtitle": "診断出力を最初に展開/折りたたみのどちらで表示するかを選びます。",
+  "settings.behavior.toolInputsVisibility.title": "ツール入力の表示",
+  "settings.behavior.toolInputsVisibility.subtitle": "ツール呼び出しの入力引数の既定の表示状態を設定します。",
+  "settings.behavior.usageMetrics.title": "トークン使用量メトリクス",
+  "settings.behavior.usageMetrics.subtitle": "アシスタントのメッセージにトークン数とコストの統計を表示/非表示にします。",
+  "settings.behavior.autoCleanup.title": "空のセッションを自動クリーンアップ",
+  "settings.behavior.autoCleanup.subtitle": "新しいセッション作成時に空のセッションを自動的にクリーンアップします。",
+  "settings.behavior.promptSubmit.title": "Enterで送信",
+  "settings.behavior.promptSubmit.subtitle": "Enterで送信し、Cmd/Ctrl+Enterで改行します。",
 } as const
diff --git a/packages/ui/src/lib/i18n/messages/ru/settings.ts b/packages/ui/src/lib/i18n/messages/ru/settings.ts
index cdd028a0..ce52f835 100644
--- a/packages/ui/src/lib/i18n/messages/ru/settings.ts
+++ b/packages/ui/src/lib/i18n/messages/ru/settings.ts
@@ -57,7 +57,6 @@ export const settingsMessages = {
   "contextUsagePanel.unavailable": "--",
 
   "settings.title": "Settings",
-  "settings.description": "Manage appearance, notifications, remote access, and OpenCode runtime options.",
   "settings.navigationAriaLabel": "Settings sections",
   "settings.close": "Close settings",
   "settings.content.eyebrow": "Workspace preferences",
@@ -70,6 +69,7 @@ export const settingsMessages = {
   "settings.scope.device": "This device",
   "settings.scope.server": "Server setting",
   "settings.common.enabled": "Enabled",
+  "settings.common.disabled": "Отключено",
   "settings.section.appearance.title": "Appearance",
   "settings.section.appearance.subtitle": "Adjust how the app looks on this device.",
   "settings.appearance.theme.title": "Theme",
@@ -112,4 +112,31 @@ export const settingsMessages = {
   "settings.section.opencode.subtitle": "Choose the OpenCode binary and environment used for new instances.",
   "settings.opencode.runtime.title": "Runtime",
   "settings.opencode.runtime.subtitle": "Configure which OpenCode binary new instances launch with.",
+
+  "settings.appearance.behavior.title": "Взаимодействие",
+  "settings.appearance.behavior.subtitle": "Значения по умолчанию для сообщений, диффов и ввода.",
+  "settings.behavior.keyboardHints.title": "Подсказки сочетаний клавиш",
+  "settings.behavior.keyboardHints.subtitle": "Показывать подсказки сочетаний клавиш по всему интерфейсу.",
+  "settings.behavior.thinking.title": "Разделы размышлений",
+  "settings.behavior.thinking.subtitle": "Показывать или скрывать разделы размышлений ИИ в сообщениях.",
+  "settings.behavior.thinkingDefault.title": "Размышления по умолчанию",
+  "settings.behavior.thinkingDefault.subtitle": "Выберите, начинать ли разделы размышлений развернутыми или свернутыми.",
+  "settings.behavior.timelineTools.title": "Вызовы инструментов в таймлайне",
+  "settings.behavior.timelineTools.subtitle": "Показывать или скрывать записи вызовов инструментов в таймлайне сообщений.",
+  "settings.behavior.diffView.title": "Вид диффа",
+  "settings.behavior.diffView.subtitle": "Выберите, как отображаются диффы вызовов инструментов.",
+  "settings.behavior.diffView.option.split": "Раздельный",
+  "settings.behavior.diffView.option.unified": "Единый",
+  "settings.behavior.toolOutputsDefault.title": "Выводы инструментов по умолчанию",
+  "settings.behavior.toolOutputsDefault.subtitle": "Выберите, начинать ли выводы инструментов развернутыми или свернутыми.",
+  "settings.behavior.diagnosticsDefault.title": "Диагностика по умолчанию",
+  "settings.behavior.diagnosticsDefault.subtitle": "Выберите, начинать ли вывод диагностики развернутым или свернутым.",
+  "settings.behavior.toolInputsVisibility.title": "Видимость входных данных инструмента",
+  "settings.behavior.toolInputsVisibility.subtitle": "Задайте видимость по умолчанию для входных аргументов вызовов инструментов.",
+  "settings.behavior.usageMetrics.title": "Метрики использования токенов",
+  "settings.behavior.usageMetrics.subtitle": "Показывать или скрывать статистику токенов и стоимости в сообщениях ассистента.",
+  "settings.behavior.autoCleanup.title": "Автоочистка пустых сессий",
+  "settings.behavior.autoCleanup.subtitle": "Автоматически очищать пустые сессии при создании новых.",
+  "settings.behavior.promptSubmit.title": "Enter для отправки",
+  "settings.behavior.promptSubmit.subtitle": "Enter отправляет; Cmd/Ctrl+Enter вставляет новую строку.",
 } as const
diff --git a/packages/ui/src/lib/i18n/messages/zh-Hans/settings.ts b/packages/ui/src/lib/i18n/messages/zh-Hans/settings.ts
index fecd0a81..8451aeae 100644
--- a/packages/ui/src/lib/i18n/messages/zh-Hans/settings.ts
+++ b/packages/ui/src/lib/i18n/messages/zh-Hans/settings.ts
@@ -57,7 +57,6 @@ export const settingsMessages = {
   "contextUsagePanel.unavailable": "--",
 
   "settings.title": "Settings",
-  "settings.description": "Manage appearance, notifications, remote access, and OpenCode runtime options.",
   "settings.navigationAriaLabel": "Settings sections",
   "settings.close": "Close settings",
   "settings.content.eyebrow": "Workspace preferences",
@@ -70,6 +69,7 @@ export const settingsMessages = {
   "settings.scope.device": "This device",
   "settings.scope.server": "Server setting",
   "settings.common.enabled": "Enabled",
+  "settings.common.disabled": "已禁用",
   "settings.section.appearance.title": "Appearance",
   "settings.section.appearance.subtitle": "Adjust how the app looks on this device.",
   "settings.appearance.theme.title": "Theme",
@@ -112,4 +112,31 @@ export const settingsMessages = {
   "settings.section.opencode.subtitle": "Choose the OpenCode binary and environment used for new instances.",
   "settings.opencode.runtime.title": "Runtime",
   "settings.opencode.runtime.subtitle": "Configure which OpenCode binary new instances launch with.",
+
+  "settings.appearance.behavior.title": "交互",
+  "settings.appearance.behavior.subtitle": "消息、差异与输入的默认值。",
+  "settings.behavior.keyboardHints.title": "键盘快捷键提示",
+  "settings.behavior.keyboardHints.subtitle": "在整个界面中显示键盘快捷键提示。",
+  "settings.behavior.thinking.title": "思考区块",
+  "settings.behavior.thinking.subtitle": "在消息中显示或隐藏AI的思考区块。",
+  "settings.behavior.thinkingDefault.title": "思考默认状态",
+  "settings.behavior.thinkingDefault.subtitle": "选择思考区块默认是展开还是折叠。",
+  "settings.behavior.timelineTools.title": "时间线工具调用",
+  "settings.behavior.timelineTools.subtitle": "在消息时间线中显示或隐藏工具调用条目。",
+  "settings.behavior.diffView.title": "差异视图",
+  "settings.behavior.diffView.subtitle": "选择工具调用差异的显示方式。",
+  "settings.behavior.diffView.option.split": "分栏",
+  "settings.behavior.diffView.option.unified": "统一",
+  "settings.behavior.toolOutputsDefault.title": "工具输出默认状态",
+  "settings.behavior.toolOutputsDefault.subtitle": "选择工具输出默认是展开还是折叠。",
+  "settings.behavior.diagnosticsDefault.title": "诊断默认状态",
+  "settings.behavior.diagnosticsDefault.subtitle": "选择诊断输出默认是展开还是折叠。",
+  "settings.behavior.toolInputsVisibility.title": "工具输入可见性",
+  "settings.behavior.toolInputsVisibility.subtitle": "设置工具调用输入参数的默认可见性。",
+  "settings.behavior.usageMetrics.title": "令牌用量指标",
+  "settings.behavior.usageMetrics.subtitle": "显示或隐藏助手消息的令牌与成本统计。",
+  "settings.behavior.autoCleanup.title": "自动清理空会话",
+  "settings.behavior.autoCleanup.subtitle": "创建新会话时自动清理空会话。",
+  "settings.behavior.promptSubmit.title": "回车发送",
+  "settings.behavior.promptSubmit.subtitle": "使用回车发送；Cmd/Ctrl+回车插入新行。",
 } as const
diff --git a/packages/ui/src/lib/settings/behavior-registry.ts b/packages/ui/src/lib/settings/behavior-registry.ts
new file mode 100644
index 00000000..b7ab1b98
--- /dev/null
+++ b/packages/ui/src/lib/settings/behavior-registry.ts
@@ -0,0 +1,452 @@
+import type { Accessor } from "solid-js"
+import type {
+  Preferences,
+  ExpansionPreference,
+  ToolInputsVisibilityPreference,
+} from "../../stores/preferences"
+import type { Command } from "../commands"
+import { tGlobal } from "../i18n"
+import { runtimeEnv } from "../runtime-env"
+
+export type BehaviorSettingKind = "toggle" | "enum"
+
+export type BehaviorToggleSetting = {
+  kind: "toggle"
+  id: string
+  titleKey: string
+  subtitleKey: string
+  get: (preferences: Preferences) => boolean
+  set: (next: boolean) => void
+  disabled?: () => boolean
+}
+
+export type BehaviorEnumSetting<T extends string = string> = {
+  kind: "enum"
+  id: string
+  titleKey: string
+  subtitleKey: string
+  get: (preferences: Preferences) => T
+  set: (next: T) => void
+  options: Array<{ value: T; labelKey: string }>
+  disabled?: () => boolean
+}
+
+export type BehaviorSetting = BehaviorToggleSetting | BehaviorEnumSetting
+
+export type BehaviorRegistryActions = {
+  preferences: Accessor<Preferences>
+  updatePreferences?: (updates: Partial<Preferences>) => void
+  toggleShowThinkingBlocks: () => void
+  toggleKeyboardShortcutHints: () => void
+  toggleShowTimelineTools: () => void
+  toggleUsageMetrics: () => void
+  toggleAutoCleanupBlankSessions: () => void
+  togglePromptSubmitOnEnter: () => void
+  setDiffViewMode: (mode: "split" | "unified") => void
+  setToolOutputExpansion: (mode: ExpansionPreference) => void
+  setDiagnosticsExpansion: (mode: ExpansionPreference) => void
+  setThinkingBlocksExpansion: (mode: ExpansionPreference) => void
+  setToolInputsVisibility: (mode: ToolInputsVisibilityPreference) => void
+}
+
+function splitKeywords(key: string): string[] {
+  return tGlobal(key)
+    .split(",")
+    .map((value) => value.trim())
+    .filter(Boolean)
+}
+
+function setBooleanByToggle(getCurrent: () => boolean, toggle: () => void, next: boolean) {
+  if (getCurrent() === next) return
+  toggle()
+}
+
+export function getBehaviorSettings(actions: BehaviorRegistryActions): BehaviorSetting[] {
+  const prefs = actions.preferences
+  const updatePreferences = actions.updatePreferences
+
+  return [
+    {
+      kind: "toggle",
+      id: "behavior.keyboardShortcutHints",
+      titleKey: "settings.behavior.keyboardHints.title",
+      subtitleKey: "settings.behavior.keyboardHints.subtitle",
+      get: (p) => Boolean(p.showKeyboardShortcutHints ?? true),
+      set: (next) => {
+        if (updatePreferences) {
+          updatePreferences({ showKeyboardShortcutHints: next })
+          return
+        }
+        setBooleanByToggle(
+          () => Boolean(prefs().showKeyboardShortcutHints ?? true),
+          actions.toggleKeyboardShortcutHints,
+          next,
+        )
+      },
+      disabled: () => runtimeEnv.host === "web",
+    },
+    {
+      kind: "toggle",
+      id: "behavior.thinkingBlocks",
+      titleKey: "settings.behavior.thinking.title",
+      subtitleKey: "settings.behavior.thinking.subtitle",
+      get: (p) => Boolean(p.showThinkingBlocks),
+      set: (next) => {
+        if (updatePreferences) {
+          updatePreferences({ showThinkingBlocks: next })
+          return
+        }
+        setBooleanByToggle(
+          () => Boolean(prefs().showThinkingBlocks),
+          actions.toggleShowThinkingBlocks,
+          next,
+        )
+      },
+    },
+    {
+      kind: "enum",
+      id: "behavior.thinkingBlocksDefault",
+      titleKey: "settings.behavior.thinkingDefault.title",
+      subtitleKey: "settings.behavior.thinkingDefault.subtitle",
+      get: (p) => (p.thinkingBlocksExpansion ?? "expanded") as ExpansionPreference,
+      set: (next) => {
+        if (updatePreferences) {
+          updatePreferences({ thinkingBlocksExpansion: next as ExpansionPreference })
+          return
+        }
+        actions.setThinkingBlocksExpansion(next as ExpansionPreference)
+      },
+      options: [
+        { value: "expanded", labelKey: "commands.common.expanded" },
+        { value: "collapsed", labelKey: "commands.common.collapsed" },
+      ],
+    },
+    {
+      kind: "toggle",
+      id: "behavior.timelineToolCalls",
+      titleKey: "settings.behavior.timelineTools.title",
+      subtitleKey: "settings.behavior.timelineTools.subtitle",
+      get: (p) => Boolean(p.showTimelineTools),
+      set: (next) => {
+        if (updatePreferences) {
+          updatePreferences({ showTimelineTools: next })
+          return
+        }
+        setBooleanByToggle(
+          () => Boolean(prefs().showTimelineTools),
+          actions.toggleShowTimelineTools,
+          next,
+        )
+      },
+    },
+    {
+      kind: "enum",
+      id: "behavior.diffViewMode",
+      titleKey: "settings.behavior.diffView.title",
+      subtitleKey: "settings.behavior.diffView.subtitle",
+      get: (p) => (p.diffViewMode ?? "split") as "split" | "unified",
+      set: (next) => {
+        if (updatePreferences) {
+          updatePreferences({ diffViewMode: next as "split" | "unified" })
+          return
+        }
+        actions.setDiffViewMode(next as "split" | "unified")
+      },
+      options: [
+        { value: "split", labelKey: "settings.behavior.diffView.option.split" },
+        { value: "unified", labelKey: "settings.behavior.diffView.option.unified" },
+      ],
+    },
+    {
+      kind: "enum",
+      id: "behavior.toolOutputsDefault",
+      titleKey: "settings.behavior.toolOutputsDefault.title",
+      subtitleKey: "settings.behavior.toolOutputsDefault.subtitle",
+      get: (p) => (p.toolOutputExpansion ?? "expanded") as ExpansionPreference,
+      set: (next) => {
+        if (updatePreferences) {
+          updatePreferences({ toolOutputExpansion: next as ExpansionPreference })
+          return
+        }
+        actions.setToolOutputExpansion(next as ExpansionPreference)
+      },
+      options: [
+        { value: "expanded", labelKey: "commands.common.expanded" },
+        { value: "collapsed", labelKey: "commands.common.collapsed" },
+      ],
+    },
+    {
+      kind: "enum",
+      id: "behavior.diagnosticsDefault",
+      titleKey: "settings.behavior.diagnosticsDefault.title",
+      subtitleKey: "settings.behavior.diagnosticsDefault.subtitle",
+      get: (p) => (p.diagnosticsExpansion ?? "expanded") as ExpansionPreference,
+      set: (next) => {
+        if (updatePreferences) {
+          updatePreferences({ diagnosticsExpansion: next as ExpansionPreference })
+          return
+        }
+        actions.setDiagnosticsExpansion(next as ExpansionPreference)
+      },
+      options: [
+        { value: "expanded", labelKey: "commands.common.expanded" },
+        { value: "collapsed", labelKey: "commands.common.collapsed" },
+      ],
+    },
+    {
+      kind: "enum",
+      id: "behavior.toolInputsVisibility",
+      titleKey: "settings.behavior.toolInputsVisibility.title",
+      subtitleKey: "settings.behavior.toolInputsVisibility.subtitle",
+      get: (p) => (p.toolInputsVisibility ?? "hidden") as ToolInputsVisibilityPreference,
+      set: (next) => {
+        if (updatePreferences) {
+          updatePreferences({ toolInputsVisibility: next as ToolInputsVisibilityPreference })
+          return
+        }
+        actions.setToolInputsVisibility(next as ToolInputsVisibilityPreference)
+      },
+      options: [
+        { value: "hidden", labelKey: "commands.common.hidden" },
+        { value: "collapsed", labelKey: "commands.common.collapsed" },
+        { value: "expanded", labelKey: "commands.common.expanded" },
+      ],
+    },
+    {
+      kind: "toggle",
+      id: "behavior.usageMetrics",
+      titleKey: "settings.behavior.usageMetrics.title",
+      subtitleKey: "settings.behavior.usageMetrics.subtitle",
+      get: (p) => Boolean(p.showUsageMetrics ?? true),
+      set: (next) => {
+        if (updatePreferences) {
+          updatePreferences({ showUsageMetrics: next })
+          return
+        }
+        setBooleanByToggle(
+          () => Boolean(prefs().showUsageMetrics ?? true),
+          actions.toggleUsageMetrics,
+          next,
+        )
+      },
+    },
+    {
+      kind: "toggle",
+      id: "behavior.autoCleanupBlankSessions",
+      titleKey: "settings.behavior.autoCleanup.title",
+      subtitleKey: "settings.behavior.autoCleanup.subtitle",
+      get: (p) => Boolean(p.autoCleanupBlankSessions),
+      set: (next) => {
+        if (updatePreferences) {
+          updatePreferences({ autoCleanupBlankSessions: next })
+          return
+        }
+        setBooleanByToggle(
+          () => Boolean(prefs().autoCleanupBlankSessions),
+          actions.toggleAutoCleanupBlankSessions,
+          next,
+        )
+      },
+    },
+    {
+      kind: "toggle",
+      id: "behavior.promptSubmitOnEnter",
+      titleKey: "settings.behavior.promptSubmit.title",
+      subtitleKey: "settings.behavior.promptSubmit.subtitle",
+      get: (p) => Boolean(p.promptSubmitOnEnter),
+      set: (next) => {
+        if (updatePreferences) {
+          updatePreferences({ promptSubmitOnEnter: next })
+          return
+        }
+        setBooleanByToggle(
+          () => Boolean(prefs().promptSubmitOnEnter),
+          actions.togglePromptSubmitOnEnter,
+          next,
+        )
+      },
+    },
+  ]
+}
+
+export function getBehaviorCommands(actions: BehaviorRegistryActions): Command[] {
+  return [
+    {
+      id: "prompt-submit-shortcut",
+      label: () =>
+        actions.preferences().promptSubmitOnEnter
+          ? tGlobal("commands.promptSubmitShortcut.label.swapped")
+          : tGlobal("commands.promptSubmitShortcut.label.default"),
+      description: () => tGlobal("commands.promptSubmitShortcut.description"),
+      category: "Input & Focus",
+      keywords: () => splitKeywords("commands.promptSubmitShortcut.keywords"),
+      action: actions.togglePromptSubmitOnEnter,
+    },
+    {
+      id: "thinking",
+      label: () =>
+        tGlobal(
+          actions.preferences().showThinkingBlocks
+            ? "commands.thinkingBlocks.label.hide"
+            : "commands.thinkingBlocks.label.show",
+        ),
+      description: () => tGlobal("commands.thinkingBlocks.description"),
+      category: "System",
+      keywords: () => ["/thinking", ...splitKeywords("commands.thinkingBlocks.keywords")],
+      action: actions.toggleShowThinkingBlocks,
+    },
+    {
+      id: "timeline-tools",
+      label: () =>
+        tGlobal(
+          actions.preferences().showTimelineTools
+            ? "commands.timelineToolCalls.label.hide"
+            : "commands.timelineToolCalls.label.show",
+        ),
+      description: () => tGlobal("commands.timelineToolCalls.description"),
+      category: "System",
+      keywords: () => splitKeywords("commands.timelineToolCalls.keywords"),
+      action: actions.toggleShowTimelineTools,
+    },
+    {
+      id: "keyboard-shortcut-hints",
+      label: () =>
+        tGlobal(
+          actions.preferences().showKeyboardShortcutHints
+            ? "commands.keyboardShortcutHints.label.hide"
+            : "commands.keyboardShortcutHints.label.show",
+        ),
+      description: () =>
+        tGlobal(
+          runtimeEnv.host === "web"
+            ? "commands.keyboardShortcutHints.description.disabledWeb"
+            : "commands.keyboardShortcutHints.description",
+        ),
+      category: "System",
+      keywords: () => splitKeywords("commands.keyboardShortcutHints.keywords"),
+      disabled: () => runtimeEnv.host === "web",
+      action: actions.toggleKeyboardShortcutHints,
+    },
+    {
+      id: "thinking-default-visibility",
+      label: () => {
+        const mode = actions.preferences().thinkingBlocksExpansion ?? "expanded"
+        const state = mode === "expanded" ? tGlobal("commands.common.expanded") : tGlobal("commands.common.collapsed")
+        return tGlobal("commands.thinkingBlocksDefault.label", { state })
+      },
+      description: () => tGlobal("commands.thinkingBlocksDefault.description"),
+      category: "System",
+      keywords: () => ["/thinking", ...splitKeywords("commands.thinkingBlocksDefault.keywords")],
+      action: () => {
+        const mode = actions.preferences().thinkingBlocksExpansion ?? "expanded"
+        const next: ExpansionPreference = mode === "expanded" ? "collapsed" : "expanded"
+        actions.setThinkingBlocksExpansion(next)
+      },
+    },
+    {
+      id: "diff-view-split",
+      label: () => {
+        const prefix = (actions.preferences().diffViewMode || "split") === "split" ? "✓ " : ""
+        return `${prefix}${tGlobal("commands.diffViewSplit.label")}`
+      },
+      description: () => tGlobal("commands.diffViewSplit.description"),
+      category: "System",
+      keywords: () => splitKeywords("commands.diffViewSplit.keywords"),
+      action: () => actions.setDiffViewMode("split"),
+    },
+    {
+      id: "diff-view-unified",
+      label: () => {
+        const prefix = (actions.preferences().diffViewMode || "split") === "unified" ? "✓ " : ""
+        return `${prefix}${tGlobal("commands.diffViewUnified.label")}`
+      },
+      description: () => tGlobal("commands.diffViewUnified.description"),
+      category: "System",
+      keywords: () => splitKeywords("commands.diffViewUnified.keywords"),
+      action: () => actions.setDiffViewMode("unified"),
+    },
+    {
+      id: "tool-output-default-visibility",
+      label: () => {
+        const mode = actions.preferences().toolOutputExpansion || "expanded"
+        const state = mode === "expanded" ? tGlobal("commands.common.expanded") : tGlobal("commands.common.collapsed")
+        return tGlobal("commands.toolOutputsDefault.label", { state })
+      },
+      description: () => tGlobal("commands.toolOutputsDefault.description"),
+      category: "System",
+      keywords: () => splitKeywords("commands.toolOutputsDefault.keywords"),
+      action: () => {
+        const mode = actions.preferences().toolOutputExpansion || "expanded"
+        const next: ExpansionPreference = mode === "expanded" ? "collapsed" : "expanded"
+        actions.setToolOutputExpansion(next)
+      },
+    },
+    {
+      id: "diagnostics-default-visibility",
+      label: () => {
+        const mode = actions.preferences().diagnosticsExpansion || "expanded"
+        const state = mode === "expanded" ? tGlobal("commands.common.expanded") : tGlobal("commands.common.collapsed")
+        return tGlobal("commands.diagnosticsDefault.label", { state })
+      },
+      description: () => tGlobal("commands.diagnosticsDefault.description"),
+      category: "System",
+      keywords: () => splitKeywords("commands.diagnosticsDefault.keywords"),
+      action: () => {
+        const mode = actions.preferences().diagnosticsExpansion || "expanded"
+        const next: ExpansionPreference = mode === "expanded" ? "collapsed" : "expanded"
+        actions.setDiagnosticsExpansion(next)
+      },
+    },
+    {
+      id: "tool-inputs-visibility",
+      label: () => {
+        const mode = actions.preferences().toolInputsVisibility || "hidden"
+        const state =
+          mode === "expanded"
+            ? tGlobal("commands.common.expanded")
+            : mode === "collapsed"
+              ? tGlobal("commands.common.collapsed")
+              : tGlobal("commands.common.hidden")
+        return tGlobal("commands.toolInputsVisibility.label", { state })
+      },
+      description: () => tGlobal("commands.toolInputsVisibility.description"),
+      category: "System",
+      keywords: () => splitKeywords("commands.toolInputsVisibility.keywords"),
+      action: () => {
+        const mode = actions.preferences().toolInputsVisibility || "hidden"
+        const next: ToolInputsVisibilityPreference =
+          mode === "hidden" ? "collapsed" : mode === "collapsed" ? "expanded" : "hidden"
+        actions.setToolInputsVisibility(next)
+      },
+    },
+    {
+      id: "token-usage-visibility",
+      label: () => {
+        const visible = actions.preferences().showUsageMetrics ?? true
+        const state = visible ? tGlobal("commands.common.visible") : tGlobal("commands.common.hidden")
+        return tGlobal("commands.tokenUsageDisplay.label", { state })
+      },
+      description: () => tGlobal("commands.tokenUsageDisplay.description"),
+      category: "System",
+      keywords: () => splitKeywords("commands.tokenUsageDisplay.keywords"),
+      action: actions.toggleUsageMetrics,
+    },
+    {
+      id: "auto-cleanup-blank-sessions",
+      label: () => {
+        const enabled = actions.preferences().autoCleanupBlankSessions
+        const state = enabled ? tGlobal("commands.common.enabled") : tGlobal("commands.common.disabled")
+        return tGlobal("commands.autoCleanupBlankSessions.label", { state })
+      },
+      description: () => tGlobal("commands.autoCleanupBlankSessions.description"),
+      category: "System",
+      keywords: () => splitKeywords("commands.autoCleanupBlankSessions.keywords"),
+      action: actions.toggleAutoCleanupBlankSessions,
+    },
+  ]
+}
+
+export function registerBehaviorCommands(register: (command: Command) => void, actions: BehaviorRegistryActions) {
+  const commands = getBehaviorCommands(actions)
+  commands.forEach((command) => register(command))
+}
diff --git a/packages/ui/src/styles/components/selector.css b/packages/ui/src/styles/components/selector.css
index a65cce76..bcecda00 100644
--- a/packages/ui/src/styles/components/selector.css
+++ b/packages/ui/src/styles/components/selector.css
@@ -15,6 +15,9 @@
   ring-color: var(--accent-primary);
 }
 
+.selector-trigger:disabled,
+.selector-trigger[aria-disabled="true"],
+.selector-trigger[data-disabled],
 .selector-trigger-disabled {
   @apply opacity-50 cursor-not-allowed;
 }