fix: guard transient controls and verify timeline endpoints

artemis/agents/operator/operator.py

@@ -1236,7 +1236,12 @@ class OperatorNode:
         # segments in lockstep).
         available_actions = self._available_device_actions()
         all_tools = [
-            operator_shell_tool(name) for name in OPERATOR_SHELL_ORDER if name in available_actions
+            operator_shell_tool(
+                name,
+                sequence_limit=self._max_burst_actions() if name == "action_sequence" else None,
+            )
+            for name in OPERATOR_SHELL_ORDER
+            if name in available_actions
         ] + self.tools
 
         # 5. Mount the task-output analyzer and collect background ADB task state.
@@ -1556,14 +1561,19 @@ class OperatorNode:
             return {k: v for k, v in el.items() if k != "center"}
 
         if tool_name in {"drag", "action_sequence"}:
-            from artemis.mcp.gestures import DragRequest, SequenceRequest, plan_drag, plan_sequence
+            from artemis.mcp.gestures import (
+                DragRequest,
+                plan_drag,
+                plan_sequence,
+                validate_sequence,
+            )
 
             try:
                 if tool_name == "drag":
                     request = DragRequest.model_validate(args)
                     planned = plan_drag(request, width, height)
                     return [{**planned, "args": request.model_dump(mode="json")}], None
-                request_sequence = SequenceRequest.model_validate(args)
+                request_sequence = validate_sequence(args, self._max_burst_actions())
                 plan_sequence(request_sequence, width, height, self._max_burst_actions())
                 return [
                     {"action": "action_sequence", "args": request_sequence.model_dump(mode="json")}