diff --git a/mobile/src/api/note-agent-actions.ts b/mobile/src/api/note-agent-actions.ts
index 5ec87be..a509fc5 100644
--- a/mobile/src/api/note-agent-actions.ts
+++ b/mobile/src/api/note-agent-actions.ts
@@ -114,6 +114,7 @@ export async function updateApprovalState(
   id: string,
   workspaceId: string,
   state: 'approved' | 'rejected',
+  reviewNote?: string,
 ): Promise<MobileApprovalItem> {
   const updated = await getApiClient().fetch<NoteAgentActionDoc>(
     `/note-agent-actions/${encodeURIComponent(id)}?workspaceId=${encodeURIComponent(workspaceId)}`,
@@ -122,6 +123,7 @@ export async function updateApprovalState(
       body: JSON.stringify({
         state,
         reviewedAt: new Date().toISOString(),
+        ...(reviewNote ? { reviewNote } : {}),
       }),
     },
   );
diff --git a/mobile/src/app/(tabs)/inbox.tsx b/mobile/src/app/(tabs)/inbox.tsx
index e18cb38..a212df8 100644
--- a/mobile/src/app/(tabs)/inbox.tsx
+++ b/mobile/src/app/(tabs)/inbox.tsx
@@ -1,5 +1,5 @@
 import { useEffect, useState } from 'react';
-import { Pressable, StyleSheet, Text, View } from 'react-native';
+import { Pressable, StyleSheet, Text, TextInput, View } from 'react-native';
 import { useInboxStore, type ActivityItem, type ApprovalItem, type InboxState } from '../../store/inbox-store';
 import { colors } from '../../theme';
 
@@ -11,6 +11,7 @@ export default function InboxScreen() {
   const approve = useInboxStore((state: InboxState) => state.approve);
   const reject = useInboxStore((state: InboxState) => state.reject);
   const [pendingApprovalId, setPendingApprovalId] = useState<string | null>(null);
+  const [reviewNote, setReviewNote] = useState('');
 
   useEffect(() => {
     void hydrate();
@@ -21,6 +22,17 @@ export default function InboxScreen() {
       <Text style={styles.title}>Inbox</Text>
       <Text style={styles.body}>Review simple agent actions and approve or reject them from mobile.</Text>
       {isLoading ? <Text style={styles.empty}>Loading approvals…</Text> : null}
+      {approvals.length > 0 ? (
+        <TextInput
+          style={styles.reviewNoteInput}
+          placeholder="Optional review note…"
+          placeholderTextColor={colors.textSecondary}
+          value={reviewNote}
+          onChangeText={setReviewNote}
+          multiline
+          numberOfLines={2}
+        />
+      ) : null}
       {approvals.map((item: ApprovalItem) => (
         <View key={item.id} style={styles.card}>
           <Text style={styles.cardTitle}>{item.title}</Text>
@@ -36,7 +48,9 @@ export default function InboxScreen() {
               onPress={async () => {
                 setPendingApprovalId(item.id);
                 try {
-                  await approve(item.id);
+                  const note = reviewNote.trim() || undefined;
+                  await approve(item.id, note);
+                  setReviewNote('');
                 } finally {
                   setPendingApprovalId(null);
                 }
@@ -55,7 +69,9 @@ export default function InboxScreen() {
               onPress={async () => {
                 setPendingApprovalId(item.id);
                 try {
-                  await reject(item.id);
+                  const note = reviewNote.trim() || undefined;
+                  await reject(item.id, note);
+                  setReviewNote('');
                 } finally {
                   setPendingApprovalId(null);
                 }
@@ -181,4 +197,15 @@ const styles = StyleSheet.create({
     fontWeight: '700',
     textTransform: 'uppercase',
   },
+  reviewNoteInput: {
+    backgroundColor: colors.bgElevated,
+    borderRadius: 12,
+    borderWidth: 1,
+    borderColor: colors.borderDefault,
+    color: colors.textPrimary,
+    padding: 12,
+    fontSize: 14,
+    minHeight: 48,
+    textAlignVertical: 'top' as const,
+  },
 });
diff --git a/mobile/src/store/inbox-store.ts b/mobile/src/store/inbox-store.ts
index 7c1cecc..9ff0991 100644
--- a/mobile/src/store/inbox-store.ts
+++ b/mobile/src/store/inbox-store.ts
@@ -28,8 +28,8 @@ export type InboxState = {
   activity: ActivityItem[];
   isLoading: boolean;
   hydrate: () => Promise<void>;
-  approve: (id: string) => Promise<void>;
-  reject: (id: string) => Promise<void>;
+  approve: (id: string, reviewNote?: string) => Promise<void>;
+  reject: (id: string, reviewNote?: string) => Promise<void>;
 };
 
 function toApprovalItem(item: MobileApprovalItem): ApprovalItem {
@@ -53,26 +53,26 @@ export const useInboxStore = create<InboxState>((set, get) => ({
       isLoading: false,
     });
   },
-  async approve(id: string) {
+  async approve(id: string, reviewNote?: string) {
     const current = get().approvals.find((item) => item.id === id);
     if (!current) {
       return;
     }
 
-    const updated = await updateApprovalState(id, current.workspaceId, 'approved');
+    const updated = await updateApprovalState(id, current.workspaceId, 'approved', reviewNote);
     set((state) => ({
       approvals: state.approvals.map((item) =>
         item.id === id ? toApprovalItem(updated) : item,
       ),
     }));
   },
-  async reject(id: string) {
+  async reject(id: string, reviewNote?: string) {
     const current = get().approvals.find((item) => item.id === id);
     if (!current) {
       return;
     }
 
-    const updated = await updateApprovalState(id, current.workspaceId, 'rejected');
+    const updated = await updateApprovalState(id, current.workspaceId, 'rejected', reviewNote);
     set((state) => ({
       approvals: state.approvals.map((item) =>
         item.id === id ? toApprovalItem(updated) : item,