diff --git a/frontend/private-data-registry.js b/frontend/private-data-registry.js
index 542407e..001923f 100644
--- a/frontend/private-data-registry.js
+++ b/frontend/private-data-registry.js
@@ -6,6 +6,7 @@
     'stackchain-voice-transcripts-v1',
     'stackchain-search-reply-drafts-v1',
     'stackchain-conversation-reply-drafts-v1',
+    'stackchain-today-action-mailbox-v1',
   ]);
   if (typeof module !== 'undefined' && module.exports) module.exports = databases;
   else root.stackchainPrivateDatabases = databases;
diff --git a/frontend/service-worker.js b/frontend/service-worker.js
index db5ca3f..71f6e5d 100644
--- a/frontend/service-worker.js
+++ b/frontend/service-worker.js
@@ -1,12 +1,67 @@
 const BASE = new URL('./', self.location.href).pathname;
 importScripts(BASE + 'static/private-data-registry.js');
 importScripts(BASE + 'static/background-issue-sync.js');
-const CACHE = 'stackchain-dashboard-shell-v125';
+const CACHE = 'stackchain-dashboard-shell-v126';
 const OFFLINE_LEASE_URL = new URL(BASE + '__offline-session-lease', self.location.origin).href;
 const OUTAGE_STATUSES = new Set([500, 502, 503, 504]);
 const NAVIGATION_TIMEOUT_MS = self.__STACKCHAIN_NAVIGATION_TIMEOUT_MS || 4000;
 const PUSH_ACTION_TIMEOUT_MS = self.__STACKCHAIN_PUSH_ACTION_TIMEOUT_MS || 8000;
+const TODAY_ACTION_TTL_MS = 2 * 60 * 1000;
 const PRIVATE_DATABASES = self.stackchainPrivateDatabases;
+
+function createTodayActionStore() {
+  const dbName = 'stackchain-today-action-mailbox-v1';
+  const storeName = 'commands';
+  const open = () => new Promise((resolve, reject) => {
+    const request = indexedDB.open(dbName, 1);
+    request.onupgradeneeded = () => request.result.createObjectStore(storeName, {keyPath:'clientId'});
+    request.onsuccess = () => resolve(request.result);
+    request.onerror = () => reject(request.error || new Error('Today action mailbox unavailable.'));
+  });
+  return {
+    async put(clientId, command) {
+      const database = await open();
+      await new Promise((resolve, reject) => {
+        const transaction = database.transaction(storeName, 'readwrite');
+        transaction.objectStore(storeName).put({...command, clientId});
+        transaction.oncomplete = resolve;
+        transaction.onerror = () => reject(transaction.error || new Error('Today action could not be saved.'));
+        transaction.onabort = transaction.onerror;
+      });
+      database.close();
+    },
+    async claim(clientId, now) {
+      const database = await open();
+      let command = null;
+      await new Promise((resolve, reject) => {
+        const transaction = database.transaction(storeName, 'readwrite');
+        const store = transaction.objectStore(storeName);
+        const request = store.get(clientId);
+        request.onsuccess = () => {
+          command = request.result || null;
+          if (command) store.delete(clientId);
+        };
+        transaction.oncomplete = resolve;
+        transaction.onerror = () => reject(transaction.error || new Error('Today action could not be claimed.'));
+        transaction.onabort = transaction.onerror;
+      });
+      database.close();
+      return command && command.expiresAt > now ? command : null;
+    },
+    async purge() {
+      const database = await open();
+      await new Promise((resolve, reject) => {
+        const transaction = database.transaction(storeName, 'readwrite');
+        transaction.objectStore(storeName).clear();
+        transaction.oncomplete = resolve;
+        transaction.onerror = () => reject(transaction.error || new Error('Today actions could not be purged.'));
+        transaction.onabort = transaction.onerror;
+      });
+      database.close();
+    },
+  };
+}
+const todayActionStore = self.__STACKCHAIN_TODAY_ACTION_STORE || createTodayActionStore();
 const SHELL = [
   BASE,
   BASE + 'manifest.webmanifest',
@@ -473,6 +528,7 @@ self.addEventListener('message', event => {
   if (event.data?.type === 'stackchain-purge-outbox') event.waitUntil((async () => {
     try {
       await issueSync.purge();
+      await todayActionStore.purge();
       await deletePrivateDatabases();
       await updateTodayLockScreen(false, false);
       event.ports?.[0]?.postMessage({ ok: true });
@@ -481,12 +537,33 @@ self.addEventListener('message', event => {
     }
   })());
   if (event.data?.type === 'stackchain-today-lock-screen') {
-    event.waitUntil(updateTodayLockScreen(
-      event.data.active === true,
-      event.data.running === true,
-      String(event.data.actionToken || ''),
-      Number(event.data.breakDeadlineAt || 0)
-    ));
+    event.waitUntil((async () => {
+      const active = event.data.active === true;
+      if (!active) await todayActionStore.purge();
+      await updateTodayLockScreen(
+        active,
+        event.data.running === true,
+        String(event.data.actionToken || ''),
+        Number(event.data.breakDeadlineAt || 0)
+      );
+    })());
+  }
+  if (event.data?.type === 'stackchain-claim-today-action') {
+    event.waitUntil((async () => {
+      const source = event.source;
+      if (!source?.id || !String(source.url || '').startsWith(self.location.origin + BASE)) return;
+      let command;
+      try { command = await todayActionStore.claim(source.id, Date.now()); }
+      catch (_error) { return; }
+      if (!command || !['pause', 'resume', 'complete'].includes(command.action)) return;
+      if (command.actionToken && !/^[A-Za-z0-9_-]{16,128}$/.test(command.actionToken)) return;
+      if (command.action === 'complete' && !command.actionToken) return;
+      source.postMessage?.({
+        type:'stackchain-today-timer-action',
+        action:command.action,
+        ...(command.actionToken ? {actionToken:command.actionToken} : {}),
+      });
+    })());
   }
 });
 
@@ -608,10 +685,17 @@ async function applyTodayTimerAction(action, actionToken = '') {
     });
     return client.focus?.();
   }
-  const query = '?today_timer_action=' + action +
-    (actionToken ? '&today_action_token=' + encodeURIComponent(actionToken) : '');
-  const target = new URL(BASE + query + route, self.location.origin).href;
-  return self.clients.openWindow(target);
+  const target = new URL(BASE + route, self.location.origin).href;
+  const opened = await self.clients.openWindow(target);
+  if (!opened?.id) return opened;
+  try {
+    await todayActionStore.put(opened.id, {
+      action,
+      ...(actionToken ? {actionToken} : {}),
+      expiresAt:Date.now() + TODAY_ACTION_TTL_MS,
+    });
+  } catch (_error) { /* The clean Today route remains safe; fail the action closed. */ }
+  return opened;
 }
 
 self.addEventListener('notificationclick', event => {
diff --git a/frontend/today-lock-screen.js b/frontend/today-lock-screen.js
index fa53577..ec9f124 100644
--- a/frontend/today-lock-screen.js
+++ b/frontend/today-lock-screen.js
@@ -149,16 +149,9 @@ function createTodayLockScreen({
     },
     consumeAction,
     async consumeLaunchAction() {
-      let url;
-      try { url = new URL(locationRef?.href || ''); }
-      catch (_error) { return false; }
-      const action = url.searchParams.get('today_timer_action');
-      if (!['pause', 'resume', 'complete'].includes(action)) return false;
-      const token = url.searchParams.get('today_action_token') || '';
-      url.searchParams.delete('today_timer_action');
-      url.searchParams.delete('today_action_token');
-      historyRef?.replaceState?.(null, '', url.pathname + url.search + url.hash);
-      return await consumeAction(action, token);
+      if (!enabled()) return false;
+      await post({type:'stackchain-claim-today-action'});
+      return true;
     },
     render,
   };
diff --git a/tests/test_comment_next.py b/tests/test_comment_next.py
index b1271f9..0126605 100644
--- a/tests/test_comment_next.py
+++ b/tests/test_comment_next.py
@@ -303,4 +303,4 @@ async def test_unread_update_offers_reply_mark_read_and_next_independent_of_toda
     assert '.update-reply-actions { display:grid; grid-template-columns:repeat(2,minmax(0,1fr));' in html
     assert '.update-reply-actions button { min-height:44px;' in html
     worker = (Path(__file__).parents[1] / "frontend" / "service-worker.js").read_text()
-    assert "stackchain-dashboard-shell-v125" in worker
+    assert "stackchain-dashboard-shell-v126" in worker
diff --git a/tests/test_dashboard_session_frontend.py b/tests/test_dashboard_session_frontend.py
index 49b3dda..5572a37 100644
--- a/tests/test_dashboard_session_frontend.py
+++ b/tests/test_dashboard_session_frontend.py
@@ -364,6 +364,7 @@ process.stdout.write(JSON.stringify(state));
         "stackchain-background-outbox-v1", "stackchain-offline-work-v2",
         "stackchain-unfiled-captures-v1", "stackchain-voice-transcripts-v1",
         "stackchain-search-reply-drafts-v1", "stackchain-conversation-reply-drafts-v1",
+        "stackchain-today-action-mailbox-v1",
     ]
     assert result["remaining"] == ["gitea.preference"]
     assert result["replaced"] == [
@@ -391,6 +392,7 @@ process.stdout.write(JSON.stringify(state));
         "stackchain-background-outbox-v1", "stackchain-offline-work-v2",
         "stackchain-unfiled-captures-v1", "stackchain-voice-transcripts-v1",
         "stackchain-search-reply-drafts-v1", "stackchain-conversation-reply-drafts-v1",
+        "stackchain-today-action-mailbox-v1",
     ]
     assert result["deletedCaches"] == ["stackchain-dashboard-shell-v15"]
     assert result["replaced"] == ["/dashboard/login?reason=session-expired"]
@@ -523,6 +525,7 @@ process.stdout.write(JSON.stringify(state));
         "stackchain-background-outbox-v1", "stackchain-offline-work-v2",
         "stackchain-unfiled-captures-v1", "stackchain-voice-transcripts-v1",
         "stackchain-search-reply-drafts-v1", "stackchain-conversation-reply-drafts-v1",
+        "stackchain-today-action-mailbox-v1",
     ]
     assert result["deletedCaches"] == ["stackchain-dashboard-shell-v15"]
     assert result["workerMessages"] == [{"type": "stackchain-purge-outbox"}]
@@ -547,6 +550,7 @@ process.stdout.write(JSON.stringify(state));
         "stackchain-background-outbox-v1", "stackchain-offline-work-v2",
         "stackchain-unfiled-captures-v1", "stackchain-voice-transcripts-v1",
         "stackchain-search-reply-drafts-v1", "stackchain-conversation-reply-drafts-v1",
+        "stackchain-today-action-mailbox-v1",
     ]
     assert result["deletedCaches"] == ["stackchain-dashboard-shell-v15"]
     assert result["workerMessages"] == [{"type": "stackchain-purge-outbox"}]
@@ -644,6 +648,7 @@ process.stdout.write(JSON.stringify(state));
         "stackchain-background-outbox-v1", "stackchain-offline-work-v2",
         "stackchain-unfiled-captures-v1", "stackchain-voice-transcripts-v1",
         "stackchain-search-reply-drafts-v1", "stackchain-conversation-reply-drafts-v1",
+        "stackchain-today-action-mailbox-v1",
     ]
     assert result["deletedCaches"] == ["stackchain-dashboard-shell-v15"]
     assert result["assigned"] == "/dashboard/login"
diff --git a/tests/test_later_sync.py b/tests/test_later_sync.py
index da4b465..a155b57 100644
--- a/tests/test_later_sync.py
+++ b/tests/test_later_sync.py
@@ -435,5 +435,5 @@ async def test_dashboard_syncs_every_later_change_and_exposes_account_status():
 def test_later_sync_ships_atomically_in_the_offline_shell():
     source = (Path(__file__).parents[1] / "frontend" / "service-worker.js").read_text()
 
-    assert "stackchain-dashboard-shell-v125" in source
+    assert "stackchain-dashboard-shell-v126" in source
     assert "BASE + 'static/later-sync.js'" in source
diff --git a/tests/test_markdown_renderer.py b/tests/test_markdown_renderer.py
index dfc5d63..ea58efb 100644
--- a/tests/test_markdown_renderer.py
+++ b/tests/test_markdown_renderer.py
@@ -256,4 +256,4 @@ def test_markdown_work_bodies_are_mobile_safe_block_containers():
     assert ".markdown-content { min-width:0; max-width:100%; overflow-wrap:anywhere;" in css
     assert ".markdown-content pre { max-width:100%; overflow-x:auto;" in css
     assert ".markdown-content a { min-height:44px;" in css
-    assert "stackchain-dashboard-shell-v125" in worker
+    assert "stackchain-dashboard-shell-v126" in worker
diff --git a/tests/test_mobile_composer_integration.py b/tests/test_mobile_composer_integration.py
index 4c41c7b..63a7fac 100644
--- a/tests/test_mobile_composer_integration.py
+++ b/tests/test_mobile_composer_integration.py
@@ -45,7 +45,7 @@ def test_offline_shell_contains_every_local_dashboard_runtime_asset():
     shell_assets = set(re.findall(r"BASE \+ '([^']+)'", worker.split("async function sessionCsrf", 1)[0]))
 
     assert local_assets <= shell_assets, f"Offline shell is missing: {sorted(local_assets - shell_assets)}"
-    assert "stackchain-dashboard-shell-v125" in worker
+    assert "stackchain-dashboard-shell-v126" in worker
 
 
 def test_all_conversation_composers_offer_accessible_mobile_mentions():
diff --git a/tests/test_mobile_device_setup.py b/tests/test_mobile_device_setup.py
index 32c5ff8..02595ed 100644
--- a/tests/test_mobile_device_setup.py
+++ b/tests/test_mobile_device_setup.py
@@ -383,7 +383,7 @@ def test_mobile_dashboard_mounts_phone_safe_device_setup_flow():
     assert "controller.recoverPermission('deadline')" in dashboard
     assert "pushControllerReady.then(ensureDeviceSetup)" in dashboard
     assert "BASE + 'static/mobile-device-setup.js'" in worker
-    assert "stackchain-dashboard-shell-v125" in worker
+    assert "stackchain-dashboard-shell-v126" in worker
     assert ".device-setup-panel" in css
     assert ".device-readiness-card" in css
     assert "overflow-x:hidden" in css
diff --git a/tests/test_mobile_insights.py b/tests/test_mobile_insights.py
index f51323b..d4f05d2 100644
--- a/tests/test_mobile_insights.py
+++ b/tests/test_mobile_insights.py
@@ -243,5 +243,5 @@ async def test_mobile_home_progressively_discloses_secondary_panels_as_insights(
 def test_mobile_insights_rolls_into_the_offline_shell():
     worker = (CONTROLLER.parent / "service-worker.js").read_text()
 
-    assert "stackchain-dashboard-shell-v125" in worker
+    assert "stackchain-dashboard-shell-v126" in worker
     assert "BASE + 'static/mobile-insights.js'" in worker
diff --git a/tests/test_mobile_start_day.py b/tests/test_mobile_start_day.py
index 10d978b..19d7e44 100644
--- a/tests/test_mobile_start_day.py
+++ b/tests/test_mobile_start_day.py
@@ -358,7 +358,7 @@ async def test_dashboard_wires_thumb_safe_start_day_briefing_into_offline_mobile
     assert ".mobile-start-day-finish { min-height:44px;" in html
     assert "max-width:100%; overflow-wrap:anywhere;" in html
     assert "BASE + 'static/mobile-start-day.js'" in service_worker
-    assert "stackchain-dashboard-shell-v125" in service_worker
+    assert "stackchain-dashboard-shell-v126" in service_worker
 
 
 @pytest.mark.anyio
diff --git a/tests/test_plan_today.py b/tests/test_plan_today.py
index 0306f29..70d1042 100644
--- a/tests/test_plan_today.py
+++ b/tests/test_plan_today.py
@@ -410,7 +410,7 @@ async def test_plan_today_wires_cancel_back_and_success_through_overlay_history(
 def test_plan_today_controller_is_available_in_the_offline_shell():
     source = SERVICE_WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v125" in source
+    assert "stackchain-dashboard-shell-v126" in source
     assert "BASE + 'static/plan-today.js'" in source
     assert "BASE + 'static/plan-today-readiness.js'" in source
     assert "BASE + 'static/plan-today-preview.js'" in source
diff --git a/tests/test_private_data_registry.py b/tests/test_private_data_registry.py
index af0d8c8..f231905 100644
--- a/tests/test_private_data_registry.py
+++ b/tests/test_private_data_registry.py
@@ -33,6 +33,7 @@ process.stdout.write(JSON.stringify(databases));
         "stackchain-voice-transcripts-v1",
         "stackchain-search-reply-drafts-v1",
         "stackchain-conversation-reply-drafts-v1",
+        "stackchain-today-action-mailbox-v1",
     }
 
 
diff --git a/tests/test_private_device_data.py b/tests/test_private_device_data.py
index 33fe93e..b17fa8b 100644
--- a/tests/test_private_device_data.py
+++ b/tests/test_private_device_data.py
@@ -50,6 +50,7 @@ const clear = createPrivateDeviceDataPurger({{
         "stackchain-voice-transcripts-v1",
         "stackchain-search-reply-drafts-v1",
         "stackchain-conversation-reply-drafts-v1",
+        "stackchain-today-action-mailbox-v1",
     ]
     assert state["caches"] == ["stackchain-dashboard-shell-v37"]
     assert state["workerMessages"] == [{"type": "stackchain-purge-outbox"}]
diff --git a/tests/test_service_worker.py b/tests/test_service_worker.py
index 29cd616..e70d68d 100644
--- a/tests/test_service_worker.py
+++ b/tests/test_service_worker.py
@@ -14,7 +14,7 @@ def run_worker_scenario(scenario: str) -> dict:
 const fs = require('fs');
 const vm = require('vm');
 const listeners = {{}};
-const state = {{ added: [], addAttempts: [], individuallyAdded: [], failedAdds: [], deleted: [], deletedDatabases: [], claimed: false, skipped: false, fetches: [], puts: [], migrated: [], activationOrder: [], oldCachedAssets: {{}}, sharedRecords: {{}}, failSharedPut: false, backgroundFlushes: 0, backgroundResumes: 0, outboxPurges: 0, outboxLifecycle: [], notifications: [], closedNotifications: 0, focused: [], opened: [], failFetch: false, stallFetch: false, lateFetch: false, fetchAborted: false, fetchStatus: 200, fetchRedirected: false, cachedBody: null }};
+const state = {{ added: [], addAttempts: [], individuallyAdded: [], failedAdds: [], deleted: [], deletedDatabases: [], claimed: false, skipped: false, fetches: [], puts: [], migrated: [], activationOrder: [], oldCachedAssets: {{}}, sharedRecords: {{}}, todayCommands: {{}}, failTodayCommandPut: false, failSharedPut: false, backgroundFlushes: 0, backgroundResumes: 0, outboxPurges: 0, outboxLifecycle: [], notifications: [], closedNotifications: 0, focused: [], opened: [], failFetch: false, stallFetch: false, lateFetch: false, fetchAborted: false, fetchStatus: 200, fetchRedirected: false, cachedBody: null }};
 const storedResponses = new Map();
 storedResponses.set(
   'https://forge.example/dashboard/__offline-session-lease',
@@ -66,12 +66,24 @@ const context = {{
       get: async id => state.sharedRecords[id] || null,
       delete: async id => {{ delete state.sharedRecords[id]; }},
     }},
+    __STACKCHAIN_TODAY_ACTION_STORE: {{
+      put: async (clientId, command) => {{
+        if (state.failTodayCommandPut) throw new Error('quota');
+        state.todayCommands[clientId] = command;
+      }},
+      claim: async (clientId, now) => {{
+        const command = state.todayCommands[clientId] || null;
+        delete state.todayCommands[clientId];
+        return command && command.expiresAt > now ? command : null;
+      }},
+      purge: async () => {{ state.todayCommands = {{}}; }},
+    }},
     addEventListener: (name, handler) => {{ listeners[name] = handler; }},
     skipWaiting: async () => {{ state.skipped = true; }},
     clients: {{
       claim: async () => {{ state.claimed = true; }},
       matchAll: async () => state.clientList || [],
-      openWindow: async url => {{ state.opened.push(url); }},
+      openWindow: async url => {{ state.opened.push(url); return state.openedClient || {{id:'opened-client',url}}; }},
     }},
     registration: {{
       showNotification: async (title, options) => state.notifications.push({{title,options}}),
@@ -133,9 +145,9 @@ async function dispatchSync(tag) {{
   listeners.sync({{ tag, waitUntil: promise => {{ pending = promise; }} }});
   if (pending) await pending;
 }}
-async function dispatchMessage(data, ports = []) {{
+async function dispatchMessage(data, ports = [], source = null) {{
   let pending;
-  listeners.message({{ data, ports, waitUntil: promise => {{ pending = promise; }} }});
+  listeners.message({{ data, ports, source, waitUntil: promise => {{ pending = promise; }} }});
   if (pending) await pending;
 }}
 async function dispatchNotificationClick(route, action = '', notificationId = null, tag = null, url = null, actionToken = '') {{
@@ -165,16 +177,16 @@ async function dispatchPush(payload) {{
     return json.loads(completed.stdout)
 
 
-def test_offline_activation_migration_rolls_the_shell_cache():
+def test_private_today_action_mailbox_rolls_the_offline_shell():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v125" in source
+    assert "stackchain-dashboard-shell-v126" in source
 
 
 def test_resumable_today_session_ships_in_a_new_offline_shell():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v125" in source
+    assert "stackchain-dashboard-shell-v126" in source
     assert "BASE + 'static/my-work.js'" in source
     assert "BASE + 'static/dashboard.js'" in source
     assert "BASE + 'static/dashboard.css'" in source
@@ -183,7 +195,7 @@ def test_resumable_today_session_ships_in_a_new_offline_shell():
 def test_mobile_conversation_photo_bundles_roll_the_offline_shell():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v125" in source
+    assert "stackchain-dashboard-shell-v126" in source
     assert "BASE + 'static/dashboard.js'" in source
     assert "BASE + 'static/authored-outbox.js'" in source
     assert "BASE + 'static/background-issue-sync.js'" in source
@@ -192,7 +204,7 @@ def test_mobile_conversation_photo_bundles_roll_the_offline_shell():
 def test_photo_metadata_sanitizer_rolls_the_cached_optimizer_atomically():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v125" in source
+    assert "stackchain-dashboard-shell-v126" in source
     assert "BASE + 'static/issue-evidence-review.js'" in source
     assert "BASE + 'static/issue-attachment.js'" in source
 
@@ -200,14 +212,14 @@ def test_photo_metadata_sanitizer_rolls_the_cached_optimizer_atomically():
 def test_ownership_exit_runtime_rolls_the_offline_shell_cache():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v125" in source
+    assert "stackchain-dashboard-shell-v126" in source
     assert "BASE + 'static/dashboard.js'" in source
 
 
 def test_offline_review_next_ships_today_completion_atomically():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v125" in source
+    assert "stackchain-dashboard-shell-v126" in source
     assert "BASE + 'static/today-completion.js'" in source
     assert "BASE + 'static/dashboard.js'" in source
 
@@ -215,7 +227,7 @@ def test_offline_review_next_ships_today_completion_atomically():
 def test_duplicate_aware_capture_ships_in_a_new_offline_shell():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v125" in source
+    assert "stackchain-dashboard-shell-v126" in source
     assert "BASE + 'static/create-issue-sheet.js'" in source
     assert "BASE + 'static/dashboard.js'" in source
 
@@ -223,7 +235,7 @@ def test_duplicate_aware_capture_ships_in_a_new_offline_shell():
 def test_inline_checklist_step_flow_rolls_the_offline_shell_atomically():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v125" in source
+    assert "stackchain-dashboard-shell-v126" in source
     assert "BASE + 'static/issue-sheet.js'" in source
     assert "BASE + 'static/checklist-conflict.js'" in source
     assert "BASE + 'static/dashboard.js'" in source
@@ -233,14 +245,14 @@ def test_inline_checklist_step_flow_rolls_the_offline_shell_atomically():
 def test_exact_later_picker_ships_atomically_in_a_new_offline_shell():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v125" in source
+    assert "stackchain-dashboard-shell-v126" in source
     assert "BASE + 'static/later-picker.js'" in source
 
 
 def test_navigation_deadline_ships_in_a_new_shell_cache():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v125" in source
+    assert "stackchain-dashboard-shell-v126" in source
     assert "BASE + 'static/dashboard.css'" in source
     assert "BASE + 'static/dashboard.js'" in source
     assert "BASE + 'static/install-app.js'" in source
@@ -249,21 +261,21 @@ def test_navigation_deadline_ships_in_a_new_shell_cache():
 def test_today_convergence_ships_in_a_new_shell_cache():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v125" in source
+    assert "stackchain-dashboard-shell-v126" in source
     assert "BASE + 'static/today-sync.js'" in source
 
 
 def test_mobile_search_viewport_ships_in_a_new_offline_shell():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v125" in source
+    assert "stackchain-dashboard-shell-v126" in source
     assert "BASE + 'static/mobile-search-viewport.js'" in source
 
 
 def test_update_ownership_flow_ships_atomically_in_a_new_offline_shell():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v125" in source
+    assert "stackchain-dashboard-shell-v126" in source
     assert "BASE + 'static/update-ownership.js'" in source
 
 
@@ -451,6 +463,7 @@ def test_revoked_background_session_purges_worker_data_and_notifies_dashboard_cl
         "stackchain-voice-transcripts-v1",
         "stackchain-search-reply-drafts-v1",
         "stackchain-conversation-reply-drafts-v1",
+        "stackchain-today-action-mailbox-v1",
     ]
     assert result["state"]["deleted"] == ["stackchain-dashboard-old"]
     assert result["state"]["clientMessages"] == [
@@ -610,17 +623,81 @@ def test_today_lock_screen_action_updates_an_open_dashboard_without_navigation()
     assert result["opened"] == []
 
 
-def test_today_lock_screen_action_opens_a_validated_one_shot_route_when_closed():
+def test_today_lock_screen_action_opens_clean_route_and_privately_hands_off_once_when_closed():
     result = run_worker_scenario(
         """
-  await dispatchNotificationClick('#/my-work/today','resume-today',null,'stackchain-today-session');
+  state.openedClient={id:'cold-client',url:'https://forge.example/dashboard/#/my-work/today'};
+  await dispatchNotificationClick('#/my-work/today','resume-today',null,'stackchain-today-session',null,'opaque-token-1234567890');
+  const messages=[];
+  const source={id:'cold-client',url:'https://forge.example/dashboard/#/my-work/today',postMessage:message=>messages.push(message)};
+  await dispatchMessage({type:'stackchain-claim-today-action'}, [], source);
+  await dispatchMessage({type:'stackchain-claim-today-action'}, [], source);
+  state.claimMessages=messages;
   process.stdout.write(JSON.stringify(state));
 """
     )
 
     assert result["opened"] == [
-        "https://forge.example/dashboard/?today_timer_action=resume#/my-work/today"
+        "https://forge.example/dashboard/#/my-work/today"
     ]
+    assert "today_timer_action" not in result["opened"][0]
+    assert "today_action_token" not in result["opened"][0]
+    assert result["claimMessages"] == [{
+        "type": "stackchain-today-timer-action",
+        "action": "resume",
+        "actionToken": "opaque-token-1234567890",
+    }]
+    assert result["todayCommands"] == {}
+
+
+def test_today_lock_screen_private_handoff_rejects_wrong_client_and_expires_closed():
+    result = run_worker_scenario(
+        """
+  state.openedClient={id:'intended-client',url:'https://forge.example/dashboard/#/my-work/today'};
+  await dispatchNotificationClick('#/my-work/today','finish-today',null,'stackchain-today-session',null,'opaque-token-1234567890');
+  const wrong=[];
+  await dispatchMessage({type:'stackchain-claim-today-action'}, [], {id:'other-client',url:'https://forge.example/dashboard/#/my-work/today',postMessage:message=>wrong.push(message)});
+  state.todayCommands['intended-client'].expiresAt=0;
+  const expired=[];
+  await dispatchMessage({type:'stackchain-claim-today-action'}, [], {id:'intended-client',url:'https://forge.example/dashboard/#/my-work/today',postMessage:message=>expired.push(message)});
+  process.stdout.write(JSON.stringify({wrong,expired,commands:state.todayCommands}));
+"""
+    )
+
+    assert result == {"wrong": [], "expired": [], "commands": {}}
+
+
+def test_today_action_mailbox_persistence_failure_opens_clean_route_without_mutation():
+    result = run_worker_scenario(
+        """
+  state.failTodayCommandPut=true;
+  state.openedClient={id:'cold-client',url:'https://forge.example/dashboard/#/my-work/today'};
+  const outcome=await dispatchNotificationClick('#/my-work/today','finish-today',null,'stackchain-today-session',null,'opaque-token-1234567890')
+    .then(()=> 'safe', error=>error.message);
+  process.stdout.write(JSON.stringify({outcome,opened:state.opened,commands:state.todayCommands}));
+"""
+    )
+
+    assert result == {
+        "outcome": "safe",
+        "opened": ["https://forge.example/dashboard/#/my-work/today"],
+        "commands": {},
+    }
+
+
+def test_private_data_purge_removes_pending_today_action_handoffs():
+    result = run_worker_scenario(
+        """
+  state.openedClient={id:'cold-client',url:'https://forge.example/dashboard/#/my-work/today'};
+  await dispatchNotificationClick('#/my-work/today','finish-today',null,'stackchain-today-session',null,'opaque-token-1234567890');
+  await dispatchMessage({type:'stackchain-purge-outbox'}, [{postMessage:()=>{}}]);
+  const messages=[];
+  await dispatchMessage({type:'stackchain-claim-today-action'}, [], {id:'cold-client',url:'https://forge.example/dashboard/#/my-work/today',postMessage:message=>messages.push(message)});
+  process.stdout.write(JSON.stringify({messages,commands:state.todayCommands}));
+"""
+    )
+
+    assert result == {"messages": [], "commands": {}}
 
 
 def test_finish_today_lock_screen_action_forwards_only_its_opaque_token():
@@ -707,6 +784,7 @@ def test_device_purge_message_stops_worker_outbox_and_acknowledges_completion():
         "stackchain-voice-transcripts-v1",
         "stackchain-search-reply-drafts-v1",
         "stackchain-conversation-reply-drafts-v1",
+        "stackchain-today-action-mailbox-v1",
     ]
     assert result["replies"] == [{"ok": True}]
 
@@ -1167,7 +1245,7 @@ def test_one_session_bound_csrf_proof_is_reused_for_a_background_drain():
 def test_queue_today_ships_atomically_in_a_new_offline_shell():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v125" in source
+    assert "stackchain-dashboard-shell-v126" in source
     assert "BASE + 'static/queue-today.js'" in source
 
 
@@ -1465,6 +1543,7 @@ def test_expired_offline_lease_purges_private_worker_data_and_refuses_cached_she
         "stackchain-voice-transcripts-v1",
         "stackchain-search-reply-drafts-v1",
         "stackchain-conversation-reply-drafts-v1",
+        "stackchain-today-action-mailbox-v1",
     ]
     assert result["state"]["deleted"] == ["stackchain-dashboard-old"]
     assert "private cached dashboard" not in result["body"]
diff --git a/tests/test_today_lock_screen.py b/tests/test_today_lock_screen.py
index 7d9e088..436574e 100644
--- a/tests/test_today_lock_screen.py
+++ b/tests/test_today_lock_screen.py
@@ -74,21 +74,19 @@ def test_disabling_or_ending_session_removes_notification():
     ]
 
 
-def test_valid_notification_action_is_consumed_once_and_removed_from_url():
+def test_cold_launch_requests_one_private_action_claim_without_url_capabilities():
     result = run_scenario(r"""
   values.set('stackchain.today-lock-screen.v1.timmy','1');
-  locationRef.href='https://forge.example/dashboard/?today_timer_action=pause#/my-work/today';
   const consumed = await lockScreen.consumeLaunchAction();
-  const second = await lockScreen.consumeLaunchAction();
   listeners['sw-message']({data:{type:'stackchain-today-timer-action',action:'resume'}});
-  process.stdout.write(JSON.stringify({consumed,second,actions,href:locationRef.href}));
+  process.stdout.write(JSON.stringify({consumed,actions,href:locationRef.href,messages}));
 """)
 
     assert result == {
         "consumed": True,
-        "second": False,
-        "actions": [["pause", None], ["resume", None]],
+        "actions": [["resume", None]],
         "href": "https://forge.example/dashboard/#/my-work/today",
+        "messages": [{"type": "stackchain-claim-today-action"}],
     }
 
 
@@ -133,20 +131,18 @@ def test_break_sync_carries_deadline_and_resume_is_bound_to_that_exact_break():
     assert "private/repo" not in json.dumps(result["messages"])
 
 
-def test_cold_launch_finish_action_is_removed_from_history_before_completion():
+def test_private_cold_launch_finish_action_is_bound_to_the_active_identity():
     result = run_scenario(r"""
   await lockScreen.enable();
   await lockScreen.sync({identity:'issue:private/repo:42:',running:true}, true);
-  locationRef.href='https://forge.example/dashboard/?today_timer_action=complete&today_action_token=opaque-token-1234567890#/my-work/today';
-  const consumed = await lockScreen.consumeLaunchAction();
-  process.stdout.write(JSON.stringify({consumed,actions,href:locationRef.href}));
+  await lockScreen.consumeLaunchAction();
+  await listeners['sw-message']({data:{type:'stackchain-today-timer-action',action:'complete',actionToken:'opaque-token-1234567890'}});
+  process.stdout.write(JSON.stringify({actions,href:locationRef.href,messages}));
 """)
 
-    assert result == {
-        "consumed": True,
-        "actions": [["complete", "issue:private/repo:42:"]],
-        "href": "https://forge.example/dashboard/#/my-work/today",
-    }
+    assert result["actions"] == [["complete", "issue:private/repo:42:"]]
+    assert result["href"] == "https://forge.example/dashboard/#/my-work/today"
+    assert result["messages"][-1] == {"type": "stackchain-claim-today-action"}
 
 
 def test_permission_denial_is_truthful_and_does_not_persist_opt_in():
diff --git a/tests/test_today_readiness.py b/tests/test_today_readiness.py
index 0649f1b..20e33e8 100644
--- a/tests/test_today_readiness.py
+++ b/tests/test_today_readiness.py
@@ -221,7 +221,7 @@ async def test_today_blocker_opens_existing_preview_and_preserves_readiness_gate
 def test_readiness_runtime_is_available_in_offline_shell():
     service_worker = SERVICE_WORKER.read_text()
 
-    assert "const CACHE = 'stackchain-dashboard-shell-v125';" in service_worker
+    assert "const CACHE = 'stackchain-dashboard-shell-v126';" in service_worker
     assert "BASE + 'static/today-readiness.js'" in service_worker
 
 
diff --git a/tests/test_today_sync.py b/tests/test_today_sync.py
index 99c208e..91d2bea 100644
--- a/tests/test_today_sync.py
+++ b/tests/test_today_sync.py
@@ -343,7 +343,7 @@ listeners['stackchain:first-task-complete']();
 def test_inflight_today_drain_ships_in_a_new_offline_shell():
     source = (Path(__file__).parents[1] / "frontend" / "service-worker.js").read_text()
 
-    assert "stackchain-dashboard-shell-v125" in source
+    assert "stackchain-dashboard-shell-v126" in source
     assert "BASE + 'static/today-sync.js'" in source