Gemini feedback

Author: kabir

spec/src/main/java/io/a2a/json/JsonUtil.java

@@ -552,12 +552,9 @@ public void write(JsonWriter out, Part<?> value) throws java.io.IOException {
                 out.name("file");
                 delegateGson.toJson(filePart.file(), FileContent.class, out);
             } else if (value instanceof DataPart dataPart) {
-                // DataPart: { "data": { "data": {...} } }
-                out.name("data");
-                out.beginObject();
+                // DataPart: { "data": {...} }
                 out.name("data");
                 delegateGson.toJson(dataPart.data(), Map.class, out);
-                out.endObject();
             } else {
                 throw new JsonSyntaxException("Unknown Part subclass: " + value.getClass().getName());
             }
@@ -589,14 +586,10 @@ Part<?> read(JsonReader in) throws java.io.IOException {
                 // FilePart: { "file": {...} }
                 return new FilePart(delegateGson.fromJson(jsonObject.get("file"), FileContent.class));
             } else if (jsonObject.has("data")) {
-                // DataPart: { "data": { "data": {...} } }
-                com.google.gson.JsonObject dataWrapper = jsonObject.getAsJsonObject("data");
-                if (dataWrapper == null || !dataWrapper.has("data")) {
-                    throw new JsonSyntaxException("DataPart wrapper must contain 'data' field");
-                }
+                // DataPart: { "data": {...} }
                 @SuppressWarnings("unchecked")
                 Map<String, Object> dataMap = delegateGson.fromJson(
-                    dataWrapper.get("data"),
+                    jsonObject.get("data"),
                     new TypeToken<Map<String, Object>>(){}.getType()
                 );
                 return new DataPart(dataMap);

spec/src/test/java/io/a2a/spec/TaskSerializationTest.java

@@ -559,10 +559,8 @@ void testDeserializeTaskWithDataPartFromJson() throws JsonProcessingException {
                   "parts": [
                     {
                       "data": {
-                        "data": {
-                          "temperature": 22.5,
-                          "humidity": 65
-                        }
+                        "temperature": 22.5,
+                        "humidity": 65
                       }
                     }
                   ]