diff --git a/pentestagent/tools/notes/__init__.py b/pentestagent/tools/notes/__init__.py
index 4a3883e..8a90e8e 100644
--- a/pentestagent/tools/notes/__init__.py
+++ b/pentestagent/tools/notes/__init__.py
@@ -210,19 +210,51 @@ def _validate_note_schema(category: str, metadata: Dict[str, Any]) -> str | None
             },
             "services": {
                 "type": "array",
-                "description": "Array of service objects with port, product, version (e.g., [{'port': 80, 'product': 'Apache', 'version': '2.2.8'}])",
+                "description": "Array of service objects with port, product, version",
+                "items": {
+                    "type": "object",
+                    "properties": {
+                        "port": {"type": "integer"},
+                        "product": {"type": "string"},
+                        "version": {"type": "string"},
+                    },
+                },
             },
             "technologies": {
                 "type": "array",
-                "description": "Array of technology objects with name, version (e.g., [{'name': 'PHP', 'version': '5.2.4'}])",
+                "description": "Array of technology objects with name, version",
+                "items": {
+                    "type": "object",
+                    "properties": {
+                        "name": {"type": "string"},
+                        "version": {"type": "string"},
+                    },
+                },
             },
             "endpoints": {
                 "type": "array",
-                "description": "Array of endpoint objects with path, methods (e.g., [{'path': '/admin', 'methods': ['GET', 'POST']}])",
+                "description": "Array of endpoint objects with path, methods",
+                "items": {
+                    "type": "object",
+                    "properties": {
+                        "path": {"type": "string"},
+                        "methods": {
+                            "type": "array",
+                            "items": {"type": "string"},
+                        },
+                    },
+                },
             },
             "weaknesses": {
                 "type": "array",
-                "description": "Array of weakness objects for WG stage (e.g., [{'id': 'CVE-2024-1234', 'description': '...'}])",
+                "description": "Array of weakness objects for WG stage",
+                "items": {
+                    "type": "object",
+                    "properties": {
+                        "id": {"type": "string"},
+                        "description": {"type": "string"},
+                    },
+                },
             },
             "affected_versions": {
                 "type": "object",