fix(a2a): convert ToolResultBlock output maps to ContentBlock

agentscope-extensions/agentscope-extensions-a2a/agentscope-extensions-a2a-client/src/main/java/io/agentscope/core/a2a/agent/message/DataPartParser.java

@@ -22,6 +22,8 @@
 import io.agentscope.core.message.TextBlock;
 import io.agentscope.core.message.ToolResultBlock;
 import io.agentscope.core.message.ToolUseBlock;
+import io.agentscope.core.util.JsonUtils;
+import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -86,16 +88,25 @@ private ContentBlock parseToToolResultBlock(DataPart part) {
             // Adapter Python Agentscope ToolResultBlock define, python tool result output spec is
             // `str | List[TextBlock | ImageBlock | AudioBlock | VideoBlock]`
             builder.output(TextBlock.builder().text(output.toString()).build());
-        } else if (output instanceof List) {
-            @SuppressWarnings("unchecked")
-            List<ContentBlock> outputList = (List<ContentBlock>) output;
-            builder.output(outputList);
+        } else if (output instanceof List<?> outputList) {
+            List<ContentBlock> contentBlocks = new ArrayList<>(outputList.size());
+            for (Object outputItem : outputList) {
+                contentBlocks.add(parseToContentBlock(outputItem));
+            }
+            builder.output(contentBlocks);
         } else {
             builder.output(List.of());
         }
         return builder.build();
     }
 
+    private ContentBlock parseToContentBlock(Object output) {
+        if (output instanceof ContentBlock contentBlock) {
+            return contentBlock;
+        }
+        return JsonUtils.getJsonCodec().convertValue(output, ContentBlock.class);
+    }
+
     private String getToolCallId(DataPart part) {
         Object toolCallId = part.getMetadata().get(MessageConstants.TOOL_CALL_ID_METADATA_KEY);
         return null != toolCallId ? toolCallId.toString() : null;

agentscope-extensions/agentscope-extensions-a2a/agentscope-extensions-a2a-client/src/test/java/io/agentscope/core/a2a/agent/message/DataPartParserTest.java

@@ -25,6 +25,7 @@
 import io.agentscope.core.message.TextBlock;
 import io.agentscope.core.message.ToolResultBlock;
 import io.agentscope.core.message.ToolUseBlock;
+import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 import org.junit.jupiter.api.BeforeEach;
@@ -141,6 +142,31 @@ void testParseToolResultBlockWithListOutput() {
         assertEquals(outputList, toolResultBlock.getOutput());
     }
 
+    @Test
+    @DisplayName("Should parse ToolResultBlock with deserialized map list output")
+    void testParseToolResultBlockWithDeserializedMapListOutput() {
+        Map<String, Object> serializedTextBlock = new LinkedHashMap<>();
+        serializedTextBlock.put("type", "text");
+        serializedTextBlock.put("text", "test output");
+
+        Map<String, Object> metadata =
+                Map.of(
+                        "_agentscope_block_type", "tool_result",
+                        "_agentscope_tool_name", "calculator",
+                        "_agentscope_tool_call_id", "123");
+        Map<String, Object> data = Map.of("_agentscope_tool_output", List.of(serializedTextBlock));
+        DataPart part = new DataPart(data, metadata);
+
+        ContentBlock result = parser.parse(part);
+
+        assertNotNull(result);
+        assertEquals(ToolResultBlock.class, result.getClass());
+        ToolResultBlock toolResultBlock = (ToolResultBlock) result;
+        ContentBlock outputBlock = toolResultBlock.getOutput().get(0);
+        assertEquals(TextBlock.class, outputBlock.getClass());
+        assertEquals("test output", ((TextBlock) outputBlock).getText());
+    }
+
     @Test
     @DisplayName("Should parse ToolResultBlock with non-String and non-List output")
     void testParseToolResultBlockWithNonStringNonListOutput() {