diff --git a/apps/api/src/activities/activities.service.ts b/apps/api/src/activities/activities.service.ts
index 8b8d406..9cd2382 100644
--- a/apps/api/src/activities/activities.service.ts
+++ b/apps/api/src/activities/activities.service.ts
@@ -83,6 +83,26 @@ function canMutateActivity(
   return assigneeIdList(row).includes(actor.userId);
 }
 
+/** ثبت نظر / تعویق — برای همهٔ مسئولان، حتی وقتی ویرایش فقط با ایجادکننده است */
+function canCollaborateActivity(
+  actor: { userId: string; role: string },
+  row: {
+    createdById?: string | null;
+    assigneeId?: string | null;
+    assignees?: Array<{ id: string }>;
+  },
+): boolean {
+  if (actor.role === 'owner' || actor.role === 'admin') return true;
+  if (row.createdById && actor.userId === row.createdById) return true;
+  return assigneeIdList(row).includes(actor.userId);
+}
+
+/** فقط dueAt / description → تعویق و ثبت نظر */
+function isCollaboratorPatch(dto: UpdateActivityRequest): boolean {
+  const keys = Object.keys(dto);
+  return keys.length > 0 && keys.every((key) => key === 'dueAt' || key === 'description');
+}
+
 function reconcileAllShares(assigneeIds: string[], completedByIds: string[]) {
   const kept = [...new Set(completedByIds.filter((id) => assigneeIds.includes(id)))];
   const done = assigneeIds.length > 0 && assigneeIds.every((id) => kept.includes(id));
@@ -836,7 +856,15 @@ export class ActivitiesService {
         assignees: { select: { id: true } },
       },
     });
-    if (!existing || !canMutateActivity(actor, existing)) {
+    if (!existing) {
+      throw new ForbiddenException('شما مجوز ویرایش این فعالیت را ندارید');
+    }
+    const collabOnly = isCollaboratorPatch(dto);
+    if (collabOnly) {
+      if (!canCollaborateActivity(actor, existing)) {
+        throw new ForbiddenException('شما مجوز ثبت نظر یا تعویق این فعالیت را ندارید');
+      }
+    } else if (!canMutateActivity(actor, existing)) {
       throw new ForbiddenException('شما مجوز ویرایش این فعالیت را ندارید');
     }
     const data: Prisma.ActivityUncheckedUpdateInput = {};
diff --git a/apps/web/src/components/activities/ActivityQuickView.vue b/apps/web/src/components/activities/ActivityQuickView.vue
index 242fdb3..56073a1 100644
--- a/apps/web/src/components/activities/ActivityQuickView.vue
+++ b/apps/web/src/components/activities/ActivityQuickView.vue
@@ -29,7 +29,7 @@ import {
   startOfLocalDay,
 } from '@/lib/jalali';
 import { useAuthStore } from '@/stores/auth';
-import { canMutateActivity } from '@/lib/activity-access';
+import { canCollaborateOnActivity, canMutateActivity } from '@/lib/activity-access';
 import ActivityCommentSheet from '@/components/activities/ActivityCommentSheet.vue';
 import JalaliDateInput from '@/components/JalaliDateInput.vue';
 
@@ -202,6 +202,9 @@ const isClosed = computed(
   () => activity.value?.status === 'done' || activity.value?.status === 'canceled',
 );
 const canMutate = computed(() => canMutateActivity(activity.value, auth.user));
+const canCollaborate = computed(() =>
+  canCollaborateOnActivity(activity.value, auth.user),
+);
 const needsEveryone = computed(
   () => activity.value?.completionMode === 'all' && (activity.value.assignees?.length ?? 0) > 1,
 );
@@ -535,7 +538,7 @@ function openFull() {
             type="primary"
             shape="circle"
             aria-label="یادداشت جدید"
-            :disabled="!canMutate"
+            :disabled="!canCollaborate"
             @click="commentOpen = true"
           >
             <template #icon><PlusOutlined /></template>
@@ -642,14 +645,14 @@ function openFull() {
           <a-flex align="center" :gap="8">
             <a-select
               v-model:value="postponeKey"
-              :disabled="saving || loading || isClosed || !canMutate"
+              :disabled="saving || loading || isClosed || !canCollaborate"
               :options="postponeChoices.map((item) => ({ value: item.key, label: item.label }))"
               :dropdown-style="{ zIndex: 1200 }"
               style="flex: 1"
             />
             <a-button
               type="primary"
-              :disabled="saving || loading || isClosed || !canMutate || !postponeReady"
+              :disabled="saving || loading || isClosed || !canCollaborate || !postponeReady"
               @click="applyPostpone"
             >
               تعویق
@@ -660,7 +663,7 @@ function openFull() {
             v-model="customDue"
             mode="datetime"
             placeholder="تاریخ و ساعت"
-            :disabled="!canMutate"
+            :disabled="!canCollaborate"
           />
         </a-flex>
 
diff --git a/apps/web/src/lib/activity-access.ts b/apps/web/src/lib/activity-access.ts
index 505ed7a..9c9714a 100644
--- a/apps/web/src/lib/activity-access.ts
+++ b/apps/web/src/lib/activity-access.ts
@@ -5,12 +5,22 @@ type ActivityAccessUser = {
   role?: string | null;
 } | null | undefined;
 
+type ActivityAccessRow = Pick<
+  ActivityDto,
+  'editPolicy' | 'createdBy' | 'assignee' | 'assignees'
+> | null | undefined;
+
+function isAssignee(
+  activity: NonNullable<ActivityAccessRow>,
+  userId: string,
+): boolean {
+  if (activity.assignee?.id === userId) return true;
+  return (activity.assignees ?? []).some((a) => a.id === userId);
+}
+
 /** ویرایش/حذف فیلدهای فعالیت — انجام/جابه‌جایی ستون جداست */
 export function canMutateActivity(
-  activity: Pick<
-    ActivityDto,
-    'editPolicy' | 'createdBy' | 'assignee' | 'assignees'
-  > | null | undefined,
+  activity: ActivityAccessRow,
   user: ActivityAccessUser,
 ): boolean {
   if (!activity || !user?.id) return false;
@@ -18,6 +28,16 @@ export function canMutateActivity(
   if (activity.createdBy?.id === user.id) return true;
   const policy: ActivityEditPolicy = activity.editPolicy ?? 'creator';
   if (policy !== 'assignees') return false;
-  if (activity.assignee?.id === user.id) return true;
-  return (activity.assignees ?? []).some((a) => a.id === user.id);
+  return isAssignee(activity, user.id);
+}
+
+/** ثبت نظر و تعویق برای همهٔ مسئولان (حتی وقتی ویرایش فقط با ایجادکننده است) */
+export function canCollaborateOnActivity(
+  activity: ActivityAccessRow,
+  user: ActivityAccessUser,
+): boolean {
+  if (!activity || !user?.id) return false;
+  if (user.role === 'owner' || user.role === 'admin') return true;
+  if (activity.createdBy?.id === user.id) return true;
+  return isAssignee(activity, user.id);
 }
diff --git a/apps/web/src/views/ActivityDetailView.vue b/apps/web/src/views/ActivityDetailView.vue
index 28dddec..95ca303 100644
--- a/apps/web/src/views/ActivityDetailView.vue
+++ b/apps/web/src/views/ActivityDetailView.vue
@@ -29,7 +29,7 @@ import type {
   TeamDto,
 } from '@mento/shared';
 import { useAuthStore } from '@/stores/auth';
-import { canMutateActivity } from '@/lib/activity-access';
+import { canCollaborateOnActivity, canMutateActivity } from '@/lib/activity-access';
 import { canAssignToOthers } from '@/lib/assign-access';
 import { apiError } from '@/lib/routines';
 import { activityTypeView, typeColorStyle, useActivityTypes } from '@/lib/activity-types';
@@ -84,7 +84,20 @@ const saving = ref(false);
 const error = ref('');
 const activity = ref<ActivityDto | null>(null);
 const canMutate = computed(() => canMutateActivity(activity.value, auth.user));
+const canCollaborate = computed(() =>
+  canCollaborateOnActivity(activity.value, auth.user),
+);
 const editLocked = computed(() => saving.value || !canMutate.value);
+const collabLocked = computed(() => saving.value || !canCollaborate.value);
+
+function warnNoMutatePermission() {
+  error.value = 'شما مجوز ویرایش یا حذف این فعالیت را ندارید.';
+}
+
+/** کنترل‌های disabled کلیک نمی‌گیرند؛ روی والد اخطار می‌دهیم */
+function onLockedEditAttempt() {
+  if (!canMutate.value && !saving.value) warnNoMutatePermission();
+}
 const canReassign = computed(
   () => canMutate.value && canAssignToOthers(auth.user, 'activities'),
 );
@@ -436,7 +449,10 @@ function clearNoteEdit() {
 
 function canEditNote(entry: ActivityThreadEntry): boolean {
   return Boolean(
-    canMutate.value && entry.dateLabel && meName.value && entry.author === meName.value,
+    canCollaborate.value &&
+    entry.dateLabel &&
+    meName.value &&
+    entry.author === meName.value,
   );
 }
 
@@ -632,6 +648,10 @@ function onBeforeUnload(event: BeforeUnloadEvent) {
 async function toggleChecklistItem(key: string, itemId: string, done: boolean) {
   const a = activity.value;
   if (!a || fieldsBusy.value) return;
+  if (!canMutate.value) {
+    warnNoMutatePermission();
+    return;
+  }
   const list = (a.fields?.[key] as ActivityChecklistItem[] | undefined) ?? [];
   const nextFields = {
     ...(a.fields ?? {}),
@@ -839,6 +859,10 @@ async function complete(kind: 'share' | 'force' | 'undo' = 'share') {
 
 async function setCompletionMode(mode: 'any' | 'all') {
   if (!id.value || activity.value?.completionMode === mode) return;
+  if (!canMutate.value) {
+    warnNoMutatePermission();
+    return;
+  }
   saving.value = true;
   error.value = '';
   try {
@@ -856,7 +880,7 @@ async function setCompletionMode(mode: 'any' | 'all') {
 async function reopen() {
   if (!id.value || !activity.value || activity.value.status === 'open') return;
   if (!canMutate.value) {
-    error.value = 'شما مجوز ویرایش این فعالیت را ندارید.';
+    warnNoMutatePermission();
     return;
   }
   saving.value = true;
@@ -1062,7 +1086,7 @@ onUnmounted(() => {
       <article class="card">
         <header class="hero">
           <div>
-            <h2>
+            <h2 @click.capture="onLockedEditAttempt">
               <input
                 v-model="draftTitle"
                 class="title-input"
@@ -1072,9 +1096,6 @@ onUnmounted(() => {
                 :disabled="editLocked"
               />
             </h2>
-            <p v-if="!canMutate" class="error" role="status">
-              شما مجوز ویرایش یا حذف این فعالیت را ندارید.
-            </p>
             <p v-if="subtitle" class="sub">
               <UiIcon name="building" :size="14" />
               {{ subtitle }}
@@ -1106,7 +1127,7 @@ onUnmounted(() => {
           />
         </div>
 
-        <dl class="meta">
+        <dl class="meta" @click.capture="onLockedEditAttempt">
           <div>
             <dt>
               <UiIcon :name="draftTypeView!.icon" :size="15" />
@@ -1646,7 +1667,7 @@ onUnmounted(() => {
         v-if="isDone || activity.status === 'canceled'"
         class="act primary"
         type="button"
-        :disabled="editLocked"
+        :disabled="saving"
         @click="reopen"
       >
         <UiIcon name="clock" :size="16" />
@@ -1675,7 +1696,7 @@ onUnmounted(() => {
       <button
         class="act ghost"
         type="button"
-        :disabled="editLocked || isDone"
+        :disabled="collabLocked || isDone"
         @click="postponeOpen = true"
       >
         <UiIcon name="refresh" :size="16" />
@@ -1684,7 +1705,7 @@ onUnmounted(() => {
       <button
         class="act ghost"
         type="button"
-        :disabled="editLocked"
+        :disabled="collabLocked"
         @click="commentOpen = true"
       >
         <UiIcon name="chat" :size="16" />