diff --git a/src/blackboard/db.py b/src/blackboard/db.py
index d55db0f..720ce1a 100644
--- a/src/blackboard/db.py
+++ b/src/blackboard/db.py
@@ -177,7 +177,7 @@ TERMINAL_STATUSES = frozenset()  # v3.1: 无终态，全靠 VALID_TRANSITIONS 
 MANUAL_STATUSES = frozenset({"cancelled", "paused"})
 
 VALID_TRANSITIONS = {
-    "pending":       {"claimed", "paused", "cancelled"},
+    "pending":       {"claimed", "paused", "blocked", "cancelled"},
     "claimed":       {"working", "paused", "pending", "cancelled"},
     "working":       {"review", "blocked", "failed", "paused", "escalated", "waiting_human", "cancelled"},
     "paused":        {"working", "claimed", "review", "escalated", "waiting_human", "cancelled"},  # 恢复到 resumed_from 记录的状态
diff --git a/src/frontend/src/components/TaskModal.tsx b/src/frontend/src/components/TaskModal.tsx
index ab480a2..451b5f4 100644
--- a/src/frontend/src/components/TaskModal.tsx
+++ b/src/frontend/src/components/TaskModal.tsx
@@ -24,7 +24,7 @@ const STATUS_META: Record<string, { color: string; label: string }> = {
 };
 
 const VALID_TRANSITIONS: Record<string, string[]> = {
-  pending:       ['claimed', 'paused', 'cancelled'],
+  pending:       ['claimed', 'paused', 'blocked', 'cancelled'],
   claimed:       ['working', 'pending', 'paused', 'cancelled'],
   working:       ['review', 'blocked', 'failed', 'paused', 'escalated', 'waiting_human', 'cancelled'],
   paused:        ['working', 'claimed', 'review', 'escalated', 'waiting_human', 'cancelled'],