diff --git a/frontend/src/components/message/PromptInput.command.test.tsx b/frontend/src/components/message/PromptInput.command.test.tsx
index 5cd875cb1..f560876d1 100644
--- a/frontend/src/components/message/PromptInput.command.test.tsx
+++ b/frontend/src/components/message/PromptInput.command.test.tsx
@@ -642,6 +642,10 @@ describe('PromptInput command submission', () => {
       renderComponent()
 
       const input = await screen.findByPlaceholderText('Send a message...')
+      expect(input).toHaveAttribute('autocomplete', 'off')
+      expect(input).toHaveAttribute('autocorrect', 'off')
+      expect(input).toHaveAttribute('autocapitalize', 'off')
+      expect(input).toHaveAttribute('spellcheck', 'false')
       fireEvent.focus(input)
       fireEvent.change(input, { target: { value: 'text' } })
       expect(screen.getByRole('button', { name: 'bash !' })).toBeDisabled()
@@ -654,6 +658,9 @@ describe('PromptInput command submission', () => {
       expect(input).toHaveValue('!')
       expect(screen.getByTestId('composer-mode-badge')).toHaveTextContent('BASH')
       expect(screen.getByRole('button', { name: 'cmd /' })).toBeDisabled()
+      expect(input).toHaveAttribute('autocorrect', 'off')
+      expect(input).toHaveAttribute('autocapitalize', 'off')
+      expect(input).toHaveAttribute('spellcheck', 'false')
 
       fireEvent.click(screen.getByRole('button', { name: 'bash !' }))
       expect(input).toHaveValue('')
diff --git a/frontend/src/components/message/PromptInput.tsx b/frontend/src/components/message/PromptInput.tsx
index f0a8d4598..c951ed077 100644
--- a/frontend/src/components/message/PromptInput.tsx
+++ b/frontend/src/components/message/PromptInput.tsx
@@ -1280,6 +1280,10 @@ return (
           onDragOver={handleDragOver}
           onDragLeave={handleDragLeave}
           onDrop={handleDrop}
+          autoComplete="off"
+          autoCorrect="off"
+          autoCapitalize="off"
+          spellCheck={false}
           placeholder={
             isBashMode
               ? "Enter bash command..."
diff --git a/frontend/src/lib/keyboardShortcuts.test.ts b/frontend/src/lib/keyboardShortcuts.test.ts
index 9e1dfce71..65d33622d 100644
--- a/frontend/src/lib/keyboardShortcuts.test.ts
+++ b/frontend/src/lib/keyboardShortcuts.test.ts
@@ -23,6 +23,13 @@ describe('keyboardShortcuts', () => {
     expect(formatShortcutEvent(new KeyboardEvent('keydown', { key: 'Shift', shiftKey: true }))).toBeNull()
   })
 
+  it('ignores a key event without a key, such as one Chrome autofill dispatches', () => {
+    const autofillEvent = new KeyboardEvent('keydown')
+    Object.defineProperty(autofillEvent, 'key', { value: undefined })
+
+    expect(formatShortcutEvent(autofillEvent)).toBeNull()
+  })
+
   it('returns the shared defaults with the key set', () => {
     expect(Object.keys(getDefaultKeyboardShortcuts())).toEqual(Object.keys(DEFAULT_KEYBOARD_SHORTCUTS))
   })
diff --git a/frontend/src/lib/keyboardShortcuts.ts b/frontend/src/lib/keyboardShortcuts.ts
index 418eca7b0..52bf4c017 100644
--- a/frontend/src/lib/keyboardShortcuts.ts
+++ b/frontend/src/lib/keyboardShortcuts.ts
@@ -59,7 +59,7 @@ export function formatEventModifiers(e: KeyboardEvent): string {
  * Formats a keydown event as a canonical shortcut string such as `Cmd+Shift+Z`, or null for a lone modifier key.
  */
 export function formatShortcutEvent(e: KeyboardEvent): string | null {
-  if (isModifierOnlyEvent(e)) return null
+  if (!e.key || isModifierOnlyEvent(e)) return null
   return [...eventModifiers(e), eventMainKey(e)].join('+')
 }