diff --git a/mobile/src/api/notes.ts b/mobile/src/api/notes.ts
index 43afd57..58b7c76 100644
--- a/mobile/src/api/notes.ts
+++ b/mobile/src/api/notes.ts
@@ -1,54 +1,80 @@
-import { createPlatformClient } from '@bytelyst/platform-client';
-import { API_CONFIG } from './config';
-import { getAuthClient } from './auth';
 import { getApiClient } from './client';
+import { listWorkspaces, type MobileWorkspace } from './workspaces';
 
 export type MobileNote = {
   id: string;
+  workspaceId: string;
   title: string;
   body: string;
   workspaceName: string;
+  status: 'draft' | 'active' | 'archived';
+  updatedAt: string;
 };
 
-const FALLBACK_NOTES: MobileNote[] = [
-  {
-    id: 'note-1',
-    title: 'Product launch checklist',
-    body: 'Finalize launch narrative and mobile scope cut line.',
-    workspaceName: 'Ops',
-  },
-  {
-    id: 'note-2',
-    title: 'Agent review policy draft',
-    body: 'Human approval required for destructive and external actions.',
-    workspaceName: 'Platform',
-  },
-];
+type NoteDoc = {
+  id: string;
+  workspaceId: string;
+  title: string;
+  body: string;
+  status: 'draft' | 'active' | 'archived';
+  updatedAt: string;
+};
 
-function getClient() {
-  const auth = getAuthClient();
+type NoteListResponse = {
+  items: NoteDoc[];
+};
 
-  return createPlatformClient({
-    baseUrl: API_CONFIG.productBaseUrl,
-    productId: API_CONFIG.productId,
-    getAccessToken: () => auth.getAccessToken(),
-    refreshAccessToken: () => auth.refreshAccessToken(),
-    timeoutMs: API_CONFIG.timeoutMs,
-  });
+function mapWorkspaceNames(workspaces: MobileWorkspace[]) {
+  return new Map(workspaces.map((workspace) => [workspace.id, workspace.name]));
+}
+
+function toMobileNote(note: NoteDoc, workspaceNames: Map<string, string>): MobileNote {
+  return {
+    id: note.id,
+    workspaceId: note.workspaceId,
+    title: note.title,
+    body: note.body,
+    workspaceName: workspaceNames.get(note.workspaceId) ?? note.workspaceId,
+    status: note.status,
+    updatedAt: note.updatedAt,
+  };
 }
 
 export async function listNotes(): Promise<MobileNote[]> {
-  try {
-    return await getApiClient().fetch<MobileNote[]>('/notes');
-  } catch {
-    return FALLBACK_NOTES;
-  }
+  const [response, workspaces] = await Promise.all([
+    getApiClient().fetch<NoteListResponse>('/notes'),
+    listWorkspaces(),
+  ]);
+
+  const workspaceNames = mapWorkspaceNames(workspaces);
+  return response.items.map((note) => toMobileNote(note, workspaceNames));
 }
 
-export async function getNote(id: string): Promise<MobileNote | null> {
-  try {
-    return await getClient().get<MobileNote>(`/notes/${id}`);
-  } catch {
-    return FALLBACK_NOTES.find((note) => note.id === id) ?? null;
-  }
+export async function getNote(id: string, workspaceId: string): Promise<MobileNote | null> {
+  const [note, workspaces] = await Promise.all([
+    getApiClient().fetch<NoteDoc>(`/notes/${id}?workspaceId=${encodeURIComponent(workspaceId)}`),
+    listWorkspaces(),
+  ]);
+
+  return toMobileNote(note, mapWorkspaceNames(workspaces));
+}
+
+export async function updateNote(
+  id: string,
+  workspaceId: string,
+  title: string,
+  body: string,
+): Promise<MobileNote> {
+  const [updated, workspaces] = await Promise.all([
+    getApiClient().fetch<NoteDoc>(`/notes/${id}?workspaceId=${encodeURIComponent(workspaceId)}`, {
+      method: 'PATCH',
+      body: JSON.stringify({
+        title,
+        body,
+      }),
+    }),
+    listWorkspaces(),
+  ]);
+
+  return toMobileNote(updated, mapWorkspaceNames(workspaces));
 }
diff --git a/mobile/src/api/workspaces.ts b/mobile/src/api/workspaces.ts
index 6042c48..cb5b454 100644
--- a/mobile/src/api/workspaces.ts
+++ b/mobile/src/api/workspaces.ts
@@ -1,12 +1,24 @@
+import { getApiClient } from './client';
+
 export type MobileWorkspace = {
   id: string;
   name: string;
+  description?: string;
+};
+
+type WorkspaceListResponse = {
+  items: Array<{
+    id: string;
+    name: string;
+    description?: string;
+  }>;
 };
 
 export async function listWorkspaces(): Promise<MobileWorkspace[]> {
-  return [
-    { id: 'ws-1', name: 'Ops' },
-    { id: 'ws-2', name: 'Platform' },
-    { id: 'ws-3', name: 'Research' },
-  ];
+  const response = await getApiClient().fetch<WorkspaceListResponse>('/workspaces');
+  return response.items.map((workspace) => ({
+    id: workspace.id,
+    name: workspace.name,
+    description: workspace.description,
+  }));
 }
diff --git a/mobile/src/store/notes-store.ts b/mobile/src/store/notes-store.ts
index f252161..24a4931 100644
--- a/mobile/src/store/notes-store.ts
+++ b/mobile/src/store/notes-store.ts
@@ -1,5 +1,5 @@
 import { create } from 'zustand';
-import { getNote, listNotes, type MobileNote } from '../api/notes';
+import { getNote, listNotes, updateNote as persistNote, type MobileNote } from '../api/notes';
 
 export type NotesState = {
   notes: MobileNote[];
@@ -8,7 +8,7 @@ export type NotesState = {
   hydrate: () => Promise<void>;
   openNote: (id: string) => Promise<void>;
   saveDraft: (title: string, body: string) => void;
-  updateNote: (id: string, title: string, body: string) => void;
+  updateNote: (id: string, title: string, body: string) => Promise<void>;
 };
 
 export const useNotesStore = create<NotesState>((set, get) => ({
@@ -22,20 +22,29 @@ export const useNotesStore = create<NotesState>((set, get) => ({
   },
   async openNote(id: string) {
     set({ isLoading: true });
-    const note = await getNote(id);
+    const current = get().notes.find((note: MobileNote) => note.id === id);
+    if (!current) {
+      set({ selectedNote: null, isLoading: false });
+      return;
+    }
+
+    const note = await getNote(id, current.workspaceId);
     set({ selectedNote: note, isLoading: false });
   },
   saveDraft(title: string, body: string) {
     const draft: MobileNote = {
       id: `draft-${Date.now()}`,
+      workspaceId: 'drafts',
       title: title.trim() || 'Untitled draft',
       body,
       workspaceName: 'Drafts',
+      status: 'draft',
+      updatedAt: new Date().toISOString(),
     };
 
     set({ notes: [draft, ...get().notes], selectedNote: draft });
   },
-  updateNote(id: string, title: string, body: string) {
+  async updateNote(id: string, title: string, body: string) {
     const nextTitle = title.trim() || 'Untitled draft';
     const current = get().notes.find((note: MobileNote) => note.id === id);
 
@@ -43,15 +52,28 @@ export const useNotesStore = create<NotesState>((set, get) => ({
       return;
     }
 
-    const updated: MobileNote = {
-      ...current,
-      title: nextTitle,
-      body,
-    };
+    if (current.workspaceId === 'drafts') {
+      const updated: MobileNote = {
+        ...current,
+        title: nextTitle,
+        body,
+        updatedAt: new Date().toISOString(),
+      };
+
+      set({
+        notes: get().notes.map((note: MobileNote) => (note.id === id ? updated : note)),
+        selectedNote: updated,
+      });
+      return;
+    }
+
+    set({ isLoading: true });
+    const updated = await persistNote(id, current.workspaceId, nextTitle, body);
 
     set({
       notes: get().notes.map((note: MobileNote) => (note.id === id ? updated : note)),
       selectedNote: updated,
+      isLoading: false,
     });
   },
 }));