diff --git a/internal/database/database.go b/internal/database/database.go
index d71c0c94..20754537 100644
--- a/internal/database/database.go
+++ b/internal/database/database.go
@@ -325,6 +325,7 @@ func (db *DB) initTables() error {
 		session_key TEXT PRIMARY KEY,
 		conversation_id TEXT NOT NULL,
 		role_name TEXT NOT NULL DEFAULT '默认',
+		agent_mode TEXT NOT NULL DEFAULT 'eino_single',
 		updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
 		FOREIGN KEY (conversation_id) REFERENCES conversations(id) ON DELETE CASCADE
 	);`
@@ -750,6 +751,9 @@ func (db *DB) initTables() error {
 	if _, err := db.Exec(createRobotUserSessionsTable); err != nil {
 		return fmt.Errorf("创建robot_user_sessions表失败: %w", err)
 	}
+	if err := db.migrateRobotUserSessionsTable(); err != nil {
+		return fmt.Errorf("迁移robot_user_sessions表失败: %w", err)
+	}
 
 	if _, err := db.Exec(createProjectsTable); err != nil {
 		return fmt.Errorf("创建projects表失败: %w", err)
@@ -873,6 +877,18 @@ func (db *DB) initTables() error {
 	return nil
 }
 
+func (db *DB) migrateRobotUserSessionsTable() error {
+	var count int
+	if err := db.QueryRow("SELECT COUNT(*) FROM pragma_table_info('robot_user_sessions') WHERE name='agent_mode'").Scan(&count); err != nil {
+		return err
+	}
+	if count == 0 {
+		_, err := db.Exec("ALTER TABLE robot_user_sessions ADD COLUMN agent_mode TEXT NOT NULL DEFAULT 'eino_single'")
+		return err
+	}
+	return nil
+}
+
 // migrateMessagesTable 迁移 messages 表，补充 updated_at 字段。
 // 语义：updated_at 表示该条消息最后一次被写入/更新的时间（例如助手占位消息在任务结束时更新正文）。
 func (db *DB) migrateMessagesTable() error {
diff --git a/internal/database/robot_session.go b/internal/database/robot_session.go
index b7631260..cd855f8b 100644
--- a/internal/database/robot_session.go
+++ b/internal/database/robot_session.go
@@ -12,6 +12,7 @@ type RobotSessionBinding struct {
 	SessionKey     string
 	ConversationID string
 	RoleName       string
+	AgentMode      string
 	UpdatedAt      time.Time
 }
 
@@ -24,9 +25,9 @@ func (db *DB) GetRobotSessionBinding(sessionKey string) (*RobotSessionBinding, e
 	var b RobotSessionBinding
 	var updatedAt string
 	err := db.QueryRow(
-		"SELECT session_key, conversation_id, role_name, updated_at FROM robot_user_sessions WHERE session_key = ?",
+		"SELECT session_key, conversation_id, role_name, agent_mode, updated_at FROM robot_user_sessions WHERE session_key = ?",
 		sessionKey,
-	).Scan(&b.SessionKey, &b.ConversationID, &b.RoleName, &updatedAt)
+	).Scan(&b.SessionKey, &b.ConversationID, &b.RoleName, &b.AgentMode, &updatedAt)
 	if err != nil {
 		if err == sql.ErrNoRows {
 			return nil, nil
@@ -43,28 +44,36 @@ func (db *DB) GetRobotSessionBinding(sessionKey string) (*RobotSessionBinding, e
 	if strings.TrimSpace(b.RoleName) == "" {
 		b.RoleName = "默认"
 	}
+	if strings.TrimSpace(b.AgentMode) == "" {
+		b.AgentMode = "eino_single"
+	}
 	return &b, nil
 }
 
 // UpsertRobotSessionBinding 写入或更新机器人会话绑定（包含角色）。
-func (db *DB) UpsertRobotSessionBinding(sessionKey, conversationID, roleName string) error {
+func (db *DB) UpsertRobotSessionBinding(sessionKey, conversationID, roleName, agentMode string) error {
 	sessionKey = strings.TrimSpace(sessionKey)
 	conversationID = strings.TrimSpace(conversationID)
 	roleName = strings.TrimSpace(roleName)
+	agentMode = strings.TrimSpace(agentMode)
 	if sessionKey == "" || conversationID == "" {
 		return nil
 	}
 	if roleName == "" {
 		roleName = "默认"
 	}
+	if agentMode == "" {
+		agentMode = "eino_single"
+	}
 	_, err := db.Exec(`
-		INSERT INTO robot_user_sessions (session_key, conversation_id, role_name, updated_at)
-		VALUES (?, ?, ?, ?)
+		INSERT INTO robot_user_sessions (session_key, conversation_id, role_name, agent_mode, updated_at)
+		VALUES (?, ?, ?, ?, ?)
 		ON CONFLICT(session_key) DO UPDATE SET
 			conversation_id = excluded.conversation_id,
 			role_name = excluded.role_name,
+			agent_mode = excluded.agent_mode,
 			updated_at = excluded.updated_at
-	`, sessionKey, conversationID, roleName, time.Now())
+	`, sessionKey, conversationID, roleName, agentMode, time.Now())
 	if err != nil {
 		return fmt.Errorf("写入机器人会话绑定失败: %w", err)
 	}