fix: populate user_id in AgentExecutorBlock nodes at save time

Generated agents have empty user_id in AgentExecutorBlock nodes.
This fix populates the actual user_id when saving the agent to the
library, ensuring sub-agents run with correct permissions.

autogpt_platform/backend/backend/api/features/chat/tools/agent_generator/core.py

@@ -26,6 +26,9 @@ from .service import (
 
 logger = logging.getLogger(__name__)
 
+# Block ID for AgentExecutorBlock - used to identify sub-agent nodes
+AGENT_EXECUTOR_BLOCK_ID = "e189baac-8c20-45a1-94a7-55177ea42565"
+
 
 class ExecutionSummary(TypedDict):
     """Summary of a single execution for quality assessment."""
@@ -671,6 +674,27 @@ def _reassign_node_ids(graph: Graph) -> None:
             link.sink_id = id_map[link.sink_id]
 
 
+def _populate_agent_executor_user_ids(agent_json: dict[str, Any], user_id: str) -> None:
+    """Populate user_id in AgentExecutorBlock nodes.
+
+    The external agent generator creates AgentExecutorBlock nodes with empty user_id.
+    This function fills in the actual user_id so sub-agents run with correct permissions.
+
+    Args:
+        agent_json: Agent JSON dict (modified in place)
+        user_id: User ID to set
+    """
+    for node in agent_json.get("nodes", []):
+        if node.get("block_id") == AGENT_EXECUTOR_BLOCK_ID:
+            input_default = node.get("input_default", {})
+            if not input_default.get("user_id"):
+                input_default["user_id"] = user_id
+                node["input_default"] = input_default
+                logger.debug(
+                    f"Set user_id for AgentExecutorBlock node {node.get('id')}"
+                )
+
+
 async def save_agent_to_library(
     agent_json: dict[str, Any], user_id: str, is_update: bool = False
 ) -> tuple[Graph, Any]:
@@ -684,6 +708,9 @@ async def save_agent_to_library(
     Returns:
         Tuple of (created Graph, LibraryAgent)
     """
+    # Populate user_id in AgentExecutorBlock nodes before conversion
+    _populate_agent_executor_user_ids(agent_json, user_id)
+
     graph = json_to_graph(agent_json)
 
     if is_update: