diff --git a/packages/app/e2e/keyboard-shortcuts-dialog.spec.ts b/packages/app/e2e/keyboard-shortcuts-dialog.spec.ts
new file mode 100644
index 000000000..d09b9f5f3
--- /dev/null
+++ b/packages/app/e2e/keyboard-shortcuts-dialog.spec.ts
@@ -0,0 +1,17 @@
+import { test, expect } from "./fixtures";
+import { gotoHome } from "./helpers/app";
+
+test("question mark opens keyboard shortcuts dialog", async ({ page }) => {
+  await gotoHome(page);
+  await page.getByTestId("menu-button").first().focus();
+
+  await page.keyboard.press("Shift+/");
+
+  const dialog = page.getByTestId("keyboard-shortcuts-dialog");
+  const content = page.getByTestId("keyboard-shortcuts-dialog-content");
+
+  await expect(dialog).toBeVisible({ timeout: 10000 });
+  await expect(content).toBeVisible({ timeout: 10000 });
+  await expect(content).toContainText("Show keyboard shortcuts");
+  await expect(content).toContainText("Toggle left sidebar");
+});
diff --git a/packages/app/src/app/_layout.tsx b/packages/app/src/app/_layout.tsx
index 75bcc058f..dac040cba 100644
--- a/packages/app/src/app/_layout.tsx
+++ b/packages/app/src/app/_layout.tsx
@@ -36,6 +36,7 @@ import {
 import { getIsTauri, getIsTauriMac } from "@/constants/layout";
 import { useTrafficLightPadding } from "@/utils/tauri-window";
 import { CommandCenter } from "@/components/command-center";
+import { KeyboardShortcutsDialog } from "@/components/keyboard-shortcuts-dialog";
 import { useKeyboardShortcuts } from "@/hooks/use-keyboard-shortcuts";
 import { queryClient } from "@/query/query-client";
 import {
@@ -255,6 +256,7 @@ function AppContainer({ children, selectedAgentId }: AppContainerProps) {
       {isMobile && chromeEnabled && <SlidingSidebar selectedAgentId={selectedAgentId} />}
       <DownloadToast />
       <CommandCenter />
+      <KeyboardShortcutsDialog />
     </View>
   );
 
diff --git a/packages/app/src/components/keyboard-shortcuts-dialog.tsx b/packages/app/src/components/keyboard-shortcuts-dialog.tsx
new file mode 100644
index 000000000..f68065323
--- /dev/null
+++ b/packages/app/src/components/keyboard-shortcuts-dialog.tsx
@@ -0,0 +1,180 @@
+import { useMemo } from "react";
+import { Text, View } from "react-native";
+import { StyleSheet } from "react-native-unistyles";
+import { getIsTauri } from "@/constants/layout";
+import { AdaptiveModalSheet } from "@/components/adaptive-modal-sheet";
+import { Shortcut } from "@/components/ui/shortcut";
+import { useKeyboardShortcutsStore } from "@/stores/keyboard-shortcuts-store";
+import type { ShortcutKey } from "@/utils/format-shortcut";
+import { getShortcutOs } from "@/utils/shortcut-platform";
+
+type ShortcutHelpRow = {
+  id: string;
+  label: string;
+  keys: ShortcutKey[];
+  note?: string;
+};
+
+type ShortcutHelpSection = {
+  title: string;
+  rows: ShortcutHelpRow[];
+};
+
+function buildShortcutHelpSections(input: {
+  isMac: boolean;
+  isTauri: boolean;
+}): ShortcutHelpSection[] {
+  const leftSidebarKeys: ShortcutKey[] = input.isMac ? ["mod", "B"] : ["mod", "."];
+  const newAgentKeys: ShortcutKey[] = input.isTauri
+    ? ["mod", "N"]
+    : ["mod", "alt", "N"];
+  const quickAgentKeys: ShortcutKey[] = input.isTauri
+    ? ["mod", "1-9"]
+    : ["alt", "1-9"];
+
+  return [
+    {
+      title: "Global",
+      rows: [
+        {
+          id: "show-shortcuts",
+          label: "Show keyboard shortcuts",
+          keys: ["?"],
+          note: "Available when focus is not in a text field or terminal.",
+        },
+        {
+          id: "toggle-left-sidebar",
+          label: "Toggle left sidebar",
+          keys: leftSidebarKeys,
+        },
+        {
+          id: "toggle-right-sidebar",
+          label: "Toggle right sidebar",
+          keys: ["mod", "E"],
+        },
+        {
+          id: "toggle-command-center",
+          label: "Toggle command center",
+          keys: ["mod", "K"],
+        },
+        {
+          id: "new-agent",
+          label: "Create new agent",
+          keys: newAgentKeys,
+        },
+        {
+          id: "quick-open-agent",
+          label: "Open sidebar agent shortcut",
+          keys: quickAgentKeys,
+        },
+      ],
+    },
+    {
+      title: "Agent Input",
+      rows: [
+        {
+          id: "dictation-toggle",
+          label: "Start/stop dictation",
+          keys: ["mod", "D"],
+        },
+        {
+          id: "voice-toggle",
+          label: "Toggle voice mode",
+          keys: ["mod", "shift", "D"],
+        },
+        {
+          id: "voice-mute-toggle",
+          label: "Mute/unmute voice mode",
+          keys: ["Space"],
+        },
+      ],
+    },
+  ];
+}
+
+export function KeyboardShortcutsDialog() {
+  const open = useKeyboardShortcutsStore((s) => s.shortcutsDialogOpen);
+  const setOpen = useKeyboardShortcutsStore((s) => s.setShortcutsDialogOpen);
+
+  const isMac = getShortcutOs() === "mac";
+  const isTauri = getIsTauri();
+  const sections = useMemo(
+    () => buildShortcutHelpSections({ isMac, isTauri }),
+    [isMac, isTauri]
+  );
+
+  return (
+    <AdaptiveModalSheet
+      title="Keyboard shortcuts"
+      visible={open}
+      onClose={() => setOpen(false)}
+      testID="keyboard-shortcuts-dialog"
+      snapPoints={["70%", "92%"]}
+    >
+      <View testID="keyboard-shortcuts-dialog-content" style={styles.content}>
+        {sections.map((section) => (
+          <View key={section.title} style={styles.section}>
+            <Text style={styles.sectionTitle}>{section.title}</Text>
+            <View style={styles.rows}>
+              {section.rows.map((row) => (
+                <View key={row.id} style={styles.row}>
+                  <View style={styles.rowText}>
+                    <Text style={styles.rowLabel}>{row.label}</Text>
+                    {row.note ? <Text style={styles.rowNote}>{row.note}</Text> : null}
+                  </View>
+                  <Shortcut keys={row.keys} style={styles.rowShortcut} />
+                </View>
+              ))}
+            </View>
+          </View>
+        ))}
+      </View>
+    </AdaptiveModalSheet>
+  );
+}
+
+const styles = StyleSheet.create((theme) => ({
+  content: {
+    gap: theme.spacing[4],
+  },
+  section: {
+    gap: theme.spacing[2],
+  },
+  sectionTitle: {
+    fontSize: theme.fontSize.xs,
+    fontWeight: theme.fontWeight.medium,
+    color: theme.colors.foregroundMuted,
+  },
+  rows: {
+    borderWidth: theme.borderWidth[1],
+    borderColor: theme.colors.surface2,
+    borderRadius: theme.borderRadius.lg,
+    overflow: "hidden",
+  },
+  row: {
+    flexDirection: "row",
+    alignItems: "center",
+    justifyContent: "space-between",
+    gap: theme.spacing[3],
+    paddingHorizontal: theme.spacing[4],
+    paddingVertical: theme.spacing[3],
+    borderBottomWidth: theme.borderWidth[1],
+    borderBottomColor: theme.colors.surface2,
+  },
+  rowText: {
+    flex: 1,
+    minWidth: 0,
+  },
+  rowLabel: {
+    fontSize: theme.fontSize.sm,
+    color: theme.colors.foreground,
+  },
+  rowNote: {
+    marginTop: 2,
+    fontSize: theme.fontSize.xs,
+    color: theme.colors.foregroundMuted,
+  },
+  rowShortcut: {
+    alignSelf: "flex-start",
+  },
+}));
diff --git a/packages/app/src/hooks/use-keyboard-shortcuts.ts b/packages/app/src/hooks/use-keyboard-shortcuts.ts
index 1fb6ee500..50efb0a29 100644
--- a/packages/app/src/hooks/use-keyboard-shortcuts.ts
+++ b/packages/app/src/hooks/use-keyboard-shortcuts.ts
@@ -179,6 +179,11 @@ export function useKeyboardShortcuts({
           store.setCommandCenterOpen(!store.commandCenterOpen);
           return true;
         }
+        case "shortcuts.dialog.toggle": {
+          const store = useKeyboardShortcutsStore.getState();
+          store.setShortcutsDialogOpen(!store.shortcutsDialogOpen);
+          return true;
+        }
         case "message-input.action":
           if (!input.payload || typeof input.payload !== "object" || !("kind" in input.payload)) {
             return false;
diff --git a/packages/app/src/keyboard/actions.ts b/packages/app/src/keyboard/actions.ts
index 03e3dfe8e..a626d5c60 100644
--- a/packages/app/src/keyboard/actions.ts
+++ b/packages/app/src/keyboard/actions.ts
@@ -18,6 +18,7 @@ export type KeyboardActionId =
   | "sidebar.toggle.right"
   | "sidebar.navigate.shortcut"
   | "command-center.toggle"
+  | "shortcuts.dialog.toggle"
   | "message-input.action";
 
 export type KeyboardShortcutPayload =
diff --git a/packages/app/src/keyboard/keyboard-shortcuts.test.ts b/packages/app/src/keyboard/keyboard-shortcuts.test.ts
index aabc6f66c..fe14d5d47 100644
--- a/packages/app/src/keyboard/keyboard-shortcuts.test.ts
+++ b/packages/app/src/keyboard/keyboard-shortcuts.test.ts
@@ -31,6 +31,32 @@ function shortcutContext(
 }
 
 describe("keyboard-shortcuts", () => {
+  it("matches question-mark shortcut to toggle the shortcuts dialog", () => {
+    const match = resolveKeyboardShortcut({
+      event: keyboardEvent({
+        key: "?",
+        code: "Slash",
+        shiftKey: true,
+      }),
+      context: shortcutContext({ focusScope: "other" }),
+    });
+
+    expect(match?.action).toBe("shortcuts.dialog.toggle");
+  });
+
+  it("does not match question-mark shortcut inside editable scopes", () => {
+    const match = resolveKeyboardShortcut({
+      event: keyboardEvent({
+        key: "?",
+        code: "Slash",
+        shiftKey: true,
+      }),
+      context: shortcutContext({ focusScope: "message-input" }),
+    });
+
+    expect(match).toBeNull();
+  });
+
   it("matches Cmd+B sidebar toggle on macOS", () => {
     const match = resolveKeyboardShortcut({
       event: keyboardEvent({
@@ -97,6 +123,31 @@ describe("keyboard-shortcuts", () => {
     expect(match).toBeNull();
   });
 
+  it("keeps space typing available in message input", () => {
+    const match = resolveKeyboardShortcut({
+      event: keyboardEvent({
+        key: " ",
+        code: "Space",
+      }),
+      context: shortcutContext({ focusScope: "message-input" }),
+    });
+
+    expect(match).toBeNull();
+  });
+
+  it("routes space to voice mute toggle outside editable scopes", () => {
+    const match = resolveKeyboardShortcut({
+      event: keyboardEvent({
+        key: " ",
+        code: "Space",
+      }),
+      context: shortcutContext({ focusScope: "other" }),
+    });
+
+    expect(match?.action).toBe("message-input.action");
+    expect(match?.payload).toEqual({ kind: "voice-mute-toggle" });
+  });
+
   it("parses Alt+digit sidebar shortcut payload", () => {
     const match = resolveKeyboardShortcut({
       event: keyboardEvent({
diff --git a/packages/app/src/keyboard/keyboard-shortcuts.ts b/packages/app/src/keyboard/keyboard-shortcuts.ts
index e80cc233c..2e63e657a 100644
--- a/packages/app/src/keyboard/keyboard-shortcuts.ts
+++ b/packages/app/src/keyboard/keyboard-shortcuts.ts
@@ -55,6 +55,17 @@ function hasDigit(event: KeyboardEvent): boolean {
   return parseDigit(event) !== null;
 }
 
+function isQuestionMarkShortcut(event: KeyboardEvent): boolean {
+  return (
+    !event.metaKey &&
+    !event.ctrlKey &&
+    !event.altKey &&
+    event.shiftKey &&
+    !event.repeat &&
+    (event.key === "?" || event.code === "Slash")
+  );
+}
+
 function withMessageInputAction(
   kind: MessageInputKeyboardActionKind
 ): (event: KeyboardEvent) => KeyboardShortcutPayload {
@@ -92,6 +103,12 @@ const SHORTCUT_BINDINGS: readonly KeyboardShortcutBinding[] = [
       (event.code === "KeyK" || event.key.toLowerCase() === "k"),
     when: () => true,
   },
+  {
+    id: "shortcuts-dialog-toggle-question-mark",
+    action: "shortcuts.dialog.toggle",
+    matches: isQuestionMarkShortcut,
+    when: (context) => context.focusScope === "other",
+  },
   {
     id: "sidebar-toggle-left-mac-cmd-b",
     action: "sidebar.toggle.left",
@@ -179,7 +196,7 @@ const SHORTCUT_BINDINGS: readonly KeyboardShortcutBinding[] = [
       !event.repeat,
     payload: withMessageInputAction("voice-mute-toggle"),
     when: (context) =>
-      !context.commandCenterOpen && context.focusScope !== "terminal",
+      !context.commandCenterOpen && context.focusScope === "other",
   },
   {
     id: "sidebar-shortcut-alt-digit",
diff --git a/packages/app/src/stores/keyboard-shortcuts-store.ts b/packages/app/src/stores/keyboard-shortcuts-store.ts
index 1452a0b06..dd0609438 100644
--- a/packages/app/src/stores/keyboard-shortcuts-store.ts
+++ b/packages/app/src/stores/keyboard-shortcuts-store.ts
@@ -9,6 +9,7 @@ export type MessageInputActionRequest = {
 
 interface KeyboardShortcutsState {
   commandCenterOpen: boolean;
+  shortcutsDialogOpen: boolean;
   altDown: boolean;
   cmdOrCtrlDown: boolean;
   /** Sidebar-visible agent keys (up to 9), in top-to-bottom visual order. */
@@ -16,6 +17,7 @@ interface KeyboardShortcutsState {
   messageInputActionRequest: MessageInputActionRequest | null;
 
   setCommandCenterOpen: (open: boolean) => void;
+  setShortcutsDialogOpen: (open: boolean) => void;
   setAltDown: (down: boolean) => void;
   setCmdOrCtrlDown: (down: boolean) => void;
   setSidebarShortcutAgentKeys: (keys: string[]) => void;
@@ -31,12 +33,14 @@ interface KeyboardShortcutsState {
 export const useKeyboardShortcutsStore = create<KeyboardShortcutsState>(
   (set, get) => ({
     commandCenterOpen: false,
+    shortcutsDialogOpen: false,
     altDown: false,
     cmdOrCtrlDown: false,
     sidebarShortcutAgentKeys: [],
     messageInputActionRequest: null,
 
     setCommandCenterOpen: (open) => set({ commandCenterOpen: open }),
+    setShortcutsDialogOpen: (open) => set({ shortcutsDialogOpen: open }),
     setAltDown: (down) => set({ altDown: down }),
     setCmdOrCtrlDown: (down) => set({ cmdOrCtrlDown: down }),
     setSidebarShortcutAgentKeys: (keys) => set({ sidebarShortcutAgentKeys: keys }),