diff --git a/mobile/src/session/MobileNativeChatMessage.tsx b/mobile/src/session/MobileNativeChatMessage.tsx
index cc6c086b1f3..4bd769a6c98 100644
--- a/mobile/src/session/MobileNativeChatMessage.tsx
+++ b/mobile/src/session/MobileNativeChatMessage.tsx
@@ -7,6 +7,7 @@ import { selectActiveToolCall } from '../../../src/shared/native-chat-tool-activ
 import { isImageRefBlock, isTextBlock } from '../../../src/shared/native-chat-types'
 import type { NativeChatBlock, NativeChatMessage } from '../../../src/shared/native-chat-types'
 import { MobileMarkdown } from '../components/MobileMarkdown'
+import { MobileNativeChatNoticeRow } from './MobileNativeChatNoticeRow'
 import { MobileNativeChatTurnStatus } from './MobileNativeChatTurnStatus'
 import { ToolRun } from './MobileNativeChatToolRun'
 import type { NativeChatTurnStatus } from './use-mobile-native-chat-turn-status'
@@ -191,6 +192,14 @@ function MobileNativeChatMessageImpl({
     />
   ) : null
 
+  const notice =
+    message.role === 'system'
+      ? message.blocks.find((block) => isTextBlock(block) && block.tone !== undefined)
+      : undefined
+  if (notice && isTextBlock(notice)) {
+    return <MobileNativeChatNoticeRow block={notice} fontScale={fontScale} />
+  }
+
   return (
     <>
       <View style={[styles.row, isUser && styles.rowUser]}>
diff --git a/mobile/src/session/MobileNativeChatNoticeRow.test.tsx b/mobile/src/session/MobileNativeChatNoticeRow.test.tsx
new file mode 100644
index 00000000000..611e65e7978
--- /dev/null
+++ b/mobile/src/session/MobileNativeChatNoticeRow.test.tsx
@@ -0,0 +1,101 @@
+import { createElement } from 'react'
+import { act, create, type ReactTestRenderer } from 'react-test-renderer'
+import { afterEach, describe, expect, it, vi } from 'vitest'
+import type { NativeChatMessage } from '../../../src/shared/native-chat-types'
+import { MobileNativeChatMessage } from './MobileNativeChatMessage'
+import { colors } from '../theme/mobile-theme'
+
+const mocks = vi.hoisted(() => ({
+  openURL: vi.fn(async () => {}),
+  copy: vi.fn()
+}))
+vi.mock('react-native', () => ({
+  Image: 'Image',
+  Pressable: 'Pressable',
+  ScrollView: 'ScrollView',
+  Text: 'Text',
+  View: 'View',
+  StyleSheet: { create: (styles: unknown) => styles, hairlineWidth: 1 },
+  Linking: { openURL: mocks.openURL }
+}))
+vi.mock('expo-clipboard', () => ({ setStringAsync: mocks.copy }))
+vi.mock('lucide-react-native', () => ({
+  ArrowUp: 'ArrowUp',
+  Copy: 'Copy',
+  AlertCircle: 'AlertCircle',
+  AlertTriangle: 'AlertTriangle',
+  Info: 'Info'
+}))
+vi.mock('../components/pr-sidebar/MermaidDiagram', () => ({
+  MermaidDiagram: 'MermaidDiagram'
+}))
+vi.mock('./MobileNativeChatToolRun', () => ({ ToolRun: 'ToolRun' }))
+vi.mock('./MobileNativeChatTurnStatus', () => ({
+  MobileNativeChatTurnStatus: 'MobileNativeChatTurnStatus'
+}))
+
+let renderer: ReactTestRenderer | null = null
+const text = 'Please run `/login`. Read [enrollment](https://example.test/enroll).'
+function render(role: NativeChatMessage['role'], tone?: 'notice' | 'warning' | 'error') {
+  const onOpenFile = vi.fn()
+  act(() => {
+    renderer = create(
+      createElement(MobileNativeChatMessage, {
+        message: {
+          id: 'record',
+          role,
+          timestamp: null,
+          source: 'transcript',
+          blocks: [{ type: 'text', text, ...(tone ? { tone } : {}) }]
+        },
+        fontScale: 1.2,
+        onOpenFile
+      })
+    )
+  })
+  return { root: renderer!.root, onOpenFile }
+}
+afterEach(() => {
+  act(() => renderer?.unmount())
+  renderer = null
+  vi.clearAllMocks()
+})
+
+describe('mobile system notice presentation', () => {
+  it.each([
+    ['notice', 'System notice', 'Info', colors.textMuted],
+    ['warning', 'System warning', 'AlertTriangle', colors.statusAmber],
+    ['error', 'System error', 'AlertCircle', colors.statusRed]
+  ] as const)('keeps %s severity distinct from assistant content', (tone, label, icon, color) => {
+    const { root } = render('system', tone)
+    expect(root.findByType(icon).props.color).toBe(color)
+    expect(root.findAllByType('Text').some((node) => node.props.children === label)).toBe(true)
+    expect(root.findAllByProps({ accessibilityLabel: 'Copy message' })).toHaveLength(0)
+    expect(
+      root.findAllByProps({
+        accessibilityLabel: 'Scroll this message to top'
+      })
+    ).toHaveLength(0)
+  })
+
+  it('uses markdown web links without turning slash commands into file actions', async () => {
+    const { root, onOpenFile } = render('system', 'notice')
+    const command = root.findAllByType('Text').find((node) => node.props.children === '/login')!
+    expect(command).toBeDefined()
+    expect(command.props.onPress).toBeUndefined()
+    const link = root.findAllByType('Text').find((node) => node.props.children === 'enrollment')!
+    await act(async () => link.props.onPress())
+    expect(mocks.openURL).toHaveBeenCalledWith('https://example.test/enroll')
+    expect(onOpenFile).not.toHaveBeenCalled()
+  })
+
+  it('preserves user bubbles and assistant controls without notice impersonation', () => {
+    const { root } = render('user')
+    expect(root.findAllByType('Text').some((node) => node.props.children === text)).toBe(true)
+    expect(root.findAllByType('Info')).toHaveLength(0)
+    act(() => renderer?.unmount())
+    const assistant = render('assistant', 'notice').root
+    expect(assistant.findAllByProps({ accessibilityLabel: 'Copy message' })).toHaveLength(1)
+    expect(assistant.findAllByType('Info')).toHaveLength(0)
+  })
+})
diff --git a/mobile/src/session/MobileNativeChatNoticeRow.tsx b/mobile/src/session/MobileNativeChatNoticeRow.tsx
new file mode 100644
index 00000000000..0bbc871ae4d
--- /dev/null
+++ b/mobile/src/session/MobileNativeChatNoticeRow.tsx
@@ -0,0 +1,45 @@
+import { StyleSheet, Text, View } from 'react-native'
+import { AlertCircle, AlertTriangle, Info } from 'lucide-react-native'
+import type { NativeChatTextBlock } from '../../../src/shared/native-chat-types'
+import { MobileMarkdown } from '../components/MobileMarkdown'
+import { colors, radii, spacing, typography } from '../theme/mobile-theme'
+
+export function MobileNativeChatNoticeRow({
+  block,
+  fontScale
+}: {
+  block: NativeChatTextBlock
+  fontScale: number
+}): React.JSX.Element {
+  const error = block.tone === 'error'
+  const warning = block.tone === 'warning'
+  const Icon = error ? AlertCircle : warning ? AlertTriangle : Info
+  const color = error ? colors.statusRed : warning ? colors.statusAmber : colors.textMuted
+  const label = error ? 'System error' : warning ? 'System warning' : 'System notice'
+  return (
+    <View style={styles.notice}>
+      <View style={styles.heading}>
+        <Icon size={typography.bodySize} color={color} />
+        <Text style={[styles.label, { color, fontSize: typography.bodySize * fontScale }]}>
+          {label}
+        </Text>
+      </View>
+      <MobileMarkdown content={block.text} textScale={1.25 * fontScale} />
+    </View>
+  )
+}
+
+const styles = StyleSheet.create({
+  notice: {
+    marginHorizontal: spacing.lg,
+    marginVertical: spacing.sm,
+    padding: spacing.md,
+    gap: spacing.sm,
+    borderRadius: radii.row,
+    borderWidth: StyleSheet.hairlineWidth,
+    borderColor: colors.borderSubtle,
+    backgroundColor: colors.bgPanel
+  },
+  heading: { flexDirection: 'row', alignItems: 'center', gap: spacing.sm },
+  label: { fontWeight: '500' }
+})