Avoid top-level composition in tool schemas

skills/product-data/schemas/normalize_dataset_draft.input.schema.json

@@ -1,8 +1,14 @@
 {
   "type": "object",
   "properties": {
-    "draft_text": {"type": "string"},
-    "draft_path": {"type": "string"},
+    "draft_text": {
+      "type": "string",
+      "description": "Dataset draft text. Provide exactly one of draft_text or draft_path."
+    },
+    "draft_path": {
+      "type": "string",
+      "description": "Path to UTF-8 dataset draft text. Provide exactly one of draft_text or draft_path."
+    },
     "batch_id": {"type": "string", "default": "aabbccdd"},
     "source_type": {
       "type": "string",
@@ -12,9 +18,5 @@
     "base_timestamp": {"type": "integer"},
     "timestamp_step_ms": {"type": "integer", "minimum": 1, "default": 60000},
     "default_request_id": {"type": "string", "default": "aabbccdd"}
-  },
-  "anyOf": [
-    {"required": ["draft_text"]},
-    {"required": ["draft_path"]}
-  ]
+  }
 }