test(tools): add test case for structure output in tool conversion

Author: jeff52415

tests/test_tools.py

@@ -321,16 +321,16 @@ async def test_convert_langchain_tool_to_fastmcp_tool(tool_instance):
     fastmcp_tool = to_fastmcp(tool_instance)
     assert fastmcp_tool.name == "add"
     assert fastmcp_tool.description == "Add two numbers"
-    assert fastmcp_tool.parameters == {
-        "description": "Add two numbers",
-        "properties": {
-            "a": {"title": "A", "type": "integer"},
-            "b": {"title": "B", "type": "integer"},
-        },
-        "required": ["a", "b"],
-        "title": "add",
-        "type": "object",
+    # Check parameters schema
+    parameters = fastmcp_tool.parameters
+    assert parameters["description"] == "Add two numbers"
+    assert parameters["properties"] == {
+        "a": {"title": "A", "type": "integer"},
+        "b": {"title": "B", "type": "integer"},
     }
+    assert parameters["required"] == ["a", "b"]
+    assert parameters["type"] == "object"
+    # Note: title varies by tool type (schema class name vs tool name)
     assert fastmcp_tool.fn_metadata.arg_model.model_json_schema() == {
         "properties": {
             "a": {"title": "A", "type": "integer"},
@@ -454,3 +454,51 @@ def custom_httpx_client_factory(
             # Expected to fail since server doesn't have SSE endpoint,
             # but the important thing is that httpx_client_factory was passed correctly
             pass
+
+
+def test_convert_with_structured_content():
+    """Test CallToolResult with structuredContent field."""
+    structured_data = {"results": [{"id": 1}, {"id": 2}], "count": 2}
+    
+    result = CallToolResult(
+        content=[TextContent(type="text", text="Search completed")],
+        isError=False
+    )
+    result.structuredContent = structured_data
+    
+    content_blocks, artifact = _convert_call_tool_result(result)
+    
+    assert content_blocks[0] == "Search completed"
+    assert content_blocks[1] == {"type": "json", "structured": structured_data}
+    assert artifact["structuredContent"] == structured_data
+
+
+def test_convert_structured_content_includes_json_block():
+    """Test that structuredContent is included as JSON block in content."""
+    structured_data = {"result": "success"}
+    
+    result = CallToolResult(
+        content=[TextContent(type="text", text="Done")],
+        isError=False
+    )
+    result.structuredContent = structured_data
+    
+    content_blocks, artifact = _convert_call_tool_result(result)
+    
+    assert isinstance(content_blocks, list)
+    assert content_blocks[0] == "Done"
+    assert content_blocks[1] == {"type": "json", "structured": structured_data}
+    assert artifact["structuredContent"] == structured_data
+
+
+def test_convert_with_structured_content_only():
+    """Test CallToolResult with only structuredContent, no text content."""
+    structured_data = {"status": "success"}
+    
+    result = CallToolResult(content=[], isError=False)
+    result.structuredContent = structured_data
+    
+    content_blocks, artifact = _convert_call_tool_result(result)
+    
+    assert content_blocks == [{"type": "json", "structured": structured_data}]
+    assert artifact["structuredContent"] == structured_data