changes according the the comments

client-sdks/stainless/openapi.yml

@@ -9855,9 +9855,21 @@ components:
           title: Object
           default: vector_store.file
         attributes:
-          additionalProperties: true
+          additionalProperties:
+            anyOf:
+            - type: string
+              maxLength: 512
+            - type: number
+            - type: boolean
+            title: string | number | boolean
+          propertyNames:
+            type: string
+            maxLength: 64
           type: object
+          maxProperties: 16
           title: Attributes
+          description: Set of 16 key-value pairs that can be attached to an object. This can be useful for storing additional information about the object in a structured format, and querying for objects via API or the dashboard. Keys are strings with a maximum length of 64 characters. Values are strings with a maximum length of 512 characters, booleans, or numbers.
+          x-oaiTypeLabel: map
         chunking_strategy:
           oneOf:
           - $ref: '#/components/schemas/VectorStoreChunkingStrategyAuto'