Apply suggestion from @Copilot

Make sure agent network metadata is a dictionary instance.

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: andreidenissov-cog

neuro_san/service/mcp/processors/mcp_tools_processor.py

@@ -234,8 +234,8 @@ async def _get_tool_description(
             "inputSchema": self.tool_request_validator.get_request_schema()
         }
         # Include agent network metadata in MCP _meta field if available:
-        network_metadata: Dict[str, Any] = agent_network.get_metadata()
-        if network_metadata is not None:
+        network_metadata: Any = agent_network.get_metadata()
+        if isinstance(network_metadata, dict):
             tool_dict["_meta"] = network_metadata
         return tool_dict