diff --git a/src/storage/mod.rs b/src/storage/mod.rs
index 956a9f9..1326709 100644
--- a/src/storage/mod.rs
+++ b/src/storage/mod.rs
@@ -17,8 +17,9 @@ pub use ports::{
 };
 pub use records::{
     allowed_namespace_names, get_namespace_description, is_valid_namespace,
-    ALLOWED_MEMORY_NAMESPACES, MemoryRecord, MemoryUpsert, SchedulerJobRecord, SchedulerJobState,
-    SchedulerJobStatus, SchedulerJobUpsert, SessionRecord, SkillEventRecord, TopicRecord,
+    ALLOWED_MEMORY_NAMESPACES, GLOBAL_SCOPE_KEY, MemoryRecord, MemoryUpsert, SchedulerJobRecord,
+    SchedulerJobState, SchedulerJobStatus, SchedulerJobUpsert, SessionRecord, SkillEventRecord,
+    TopicRecord,
 };
 
 #[derive(Clone)]
@@ -210,6 +211,7 @@ impl SessionStore {
         ensure_sessions_schema(&conn)?;
         ensure_messages_schema(&conn)?;
         ensure_scheduler_schema(&conn)?;
+        ensure_memory_scope_key_migration(&conn)?;
 
         Ok(Self {
             conn: Arc::new(Mutex::new(conn)),
@@ -1726,6 +1728,14 @@ fn ensure_scheduler_schema(conn: &Connection) -> Result<(), StorageError> {
     Ok(())
 }
 
+fn ensure_memory_scope_key_migration(conn: &Connection) -> Result<(), StorageError> {
+    conn.execute(
+        "UPDATE memories SET scope_key = 'default' WHERE scope_key != 'default'",
+        [],
+    )?;
+    Ok(())
+}
+
 fn has_column(
     conn: &Connection,
     table_name: &str,
diff --git a/src/storage/records.rs b/src/storage/records.rs
index 115c991..7bc1c0e 100644
--- a/src/storage/records.rs
+++ b/src/storage/records.rs
@@ -1,5 +1,8 @@
 use serde::{Deserialize, Serialize};
 
+/// 全局统一的记忆 scope_key，所有渠道共享同一份记忆空间
+pub const GLOBAL_SCOPE_KEY: &str = "default";
+
 /// 允许的记忆命名空间列表
 ///
 /// 每个命名空间代表一类记忆内容，用于分类管理和检索。
diff --git a/src/tools/memory_manage.rs b/src/tools/memory_manage.rs
index 8cae0f1..a66e818 100644
--- a/src/tools/memory_manage.rs
+++ b/src/tools/memory_manage.rs
@@ -187,12 +187,8 @@ fn build_memory_upsert(
     })
 }
 
-fn scope_key_from_context(context: &ToolContext) -> Result<String, ToolResult> {
-    let channel_name = context
-        .channel_name
-        .as_deref()
-        .ok_or_else(|| error_result("memory_manage requires channel_name in tool context"))?;
-    Ok(channel_name.to_string())
+fn scope_key_from_context(_context: &ToolContext) -> Result<String, ToolResult> {
+    Ok(crate::storage::GLOBAL_SCOPE_KEY.to_string())
 }
 
 fn memory_to_json(memory: MemoryRecord) -> serde_json::Value {
@@ -260,22 +256,26 @@ mod tests {
     }
 
     #[tokio::test]
-    async fn test_memory_manage_requires_context() {
+    async fn test_memory_manage_works_with_default_context() {
         let store = Arc::new(SessionStore::in_memory().unwrap());
         let tool = MemoryManageTool::new(store);
 
+        // scope_key 已全局统一为 "default"，不再依赖 channel_name
         let result = tool
             .execute_with_context(
                 &ToolContext::default(),
                 json!({
-                    "action": "list"
+                    "action": "put",
+                    "namespace": "user",
+                    "key": "language",
+                    "content": "Rust"
                 }),
             )
             .await
             .unwrap();
 
-        assert!(!result.success);
-        assert!(result.error.unwrap().contains("channel_name"));
+        assert!(result.success);
+        assert!(result.output.contains("Rust"));
     }
 
     #[tokio::test]
diff --git a/src/tools/memory_search.rs b/src/tools/memory_search.rs
index f0e5863..ff166c0 100644
--- a/src/tools/memory_search.rs
+++ b/src/tools/memory_search.rs
@@ -186,12 +186,8 @@ impl Tool for MemorySearchTool {
     }
 }
 
-fn scope_key_from_context(context: &ToolContext) -> Result<String, ToolResult> {
-    let channel_name = context
-        .channel_name
-        .as_deref()
-        .ok_or_else(|| error_result("memory_search requires channel_name in tool context"))?;
-    Ok(channel_name.to_string())
+fn scope_key_from_context(_context: &ToolContext) -> Result<String, ToolResult> {
+    Ok(crate::storage::GLOBAL_SCOPE_KEY.to_string())
 }
 
 fn memory_to_json(memory: MemoryRecord) -> serde_json::Value {
@@ -234,7 +230,7 @@ mod tests {
         store
             .put_memory(&crate::storage::MemoryUpsert {
                 scope_kind: "user".to_string(),
-                scope_key: TEST_CHANNEL.to_string(),
+                scope_key: crate::storage::GLOBAL_SCOPE_KEY.to_string(),
                 namespace: "user".to_string(),
                 memory_key: "language".to_string(),
                 content: "User prefers Chinese responses".to_string(),
@@ -250,10 +246,6 @@ mod tests {
         let tool = MemorySearchTool::new(store);
         let context = ToolContext {
             channel_name: Some(TEST_CHANNEL.to_string()),
-            chat_id: Some("chat-1".to_string()),
-            session_id: Some(format!("{}:chat-1", TEST_CHANNEL)),
-            message_id: Some("msg-2".to_string()),
-            message_seq: Some(2),
             ..ToolContext::default()
         };
 
@@ -287,18 +279,18 @@ mod tests {
     }
 
     #[tokio::test]
-    async fn test_memory_search_is_read_only_and_requires_context() {
+    async fn test_memory_search_is_read_only_and_works_with_default_context() {
         let store = Arc::new(SessionStore::in_memory().unwrap());
         let tool = MemorySearchTool::new(store);
 
         assert!(tool.read_only());
 
+        // scope_key 已全局统一为 "default"，不再依赖 channel_name
         let result = tool
             .execute_with_context(&ToolContext::default(), json!({ "action": "list" }))
             .await
             .unwrap();
-        assert!(!result.success);
-        assert!(result.error.unwrap().contains("channel_name"));
+        assert!(result.success);
     }
 
     #[tokio::test]