diff --git a/python/packages/autogen-ext/src/autogen_ext/tools/mcp/_base.py b/python/packages/autogen-ext/src/autogen_ext/tools/mcp/_base.py
index a8a5e00e9790..488984ede072 100644
--- a/python/packages/autogen-ext/src/autogen_ext/tools/mcp/_base.py
+++ b/python/packages/autogen-ext/src/autogen_ext/tools/mcp/_base.py
@@ -7,9 +7,7 @@
 from autogen_core.tools import BaseTool
 from autogen_core.utils import schema_to_pydantic_model
 from mcp import ClientSession, Tool
-from mcp.types import AnyUrl, EmbeddedResource, ImageContent, TextContent
 from pydantic import BaseModel
-import json
 
 from ._config import McpServerParams
 from ._session import create_mcp_server_session
@@ -117,27 +115,6 @@ async def from_server_params(cls, server_params: TServerParams, tool_name: str)
 
         return cls(server_params=server_params, tool=matching_tool)
 
-    def return_value_as_string(self, value: list) -> str:
-        """Return a string representation of the result."""
-
-        def serialize_item(item):
-            if isinstance(item, (TextContent, ImageContent)):
-                return item.model_dump()
-            elif isinstance(item, EmbeddedResource):
-                type = item.type
-                resource = {}
-                for key, val in item.resource.model_dump().items():
-                    if isinstance(val, AnyUrl):
-                        resource[key] = str(val)
-                    else:
-                        resource[key] = val
-                annotations = item.annotations.model_dump() if item.annotations else None
-                return {"type": type, "resource": resource, "annotations": annotations}
-            else:
-                return str(item)
-
-        return json.dumps([serialize_item(item) for item in value])
-
     def _format_errors(self, error: Exception) -> str:
         """Recursively format errors into a string."""
 
diff --git a/python/packages/autogen-ext/tests/tools/test_mcp_tools.py b/python/packages/autogen-ext/tests/tools/test_mcp_tools.py
index 5d9897ac6721..10f17c2c35e0 100644
--- a/python/packages/autogen-ext/tests/tools/test_mcp_tools.py
+++ b/python/packages/autogen-ext/tests/tools/test_mcp_tools.py
@@ -16,14 +16,6 @@
     mcp_server_tools,
 )
 from mcp import ClientSession, Tool
-from mcp.types import (
-    AnyUrl,
-    Annotations,
-    EmbeddedResource,
-    ImageContent,
-    TextContent,
-    TextResourceContents,
-)
 
 
 @pytest.fixture
@@ -190,53 +182,6 @@ async def test_adapter_from_server_params(
     )
 
 
-@pytest.mark.asyncio
-async def test_adapter_from_server_params_with_return_value_as_string(
-    sample_tool: Tool,
-    sample_server_params: StdioServerParams,
-    mock_session: AsyncMock,
-    monkeypatch: pytest.MonkeyPatch,
-) -> None:
-    """Test that adapter can be created from server parameters."""
-    mock_context = AsyncMock()
-    mock_context.__aenter__.return_value = mock_session
-    monkeypatch.setattr(
-        "autogen_ext.tools.mcp._base.create_mcp_server_session",
-        lambda *args, **kwargs: mock_context,  # type: ignore
-    )
-
-    mock_session.list_tools.return_value.tools = [sample_tool]
-
-    adapter = await StdioMcpToolAdapter.from_server_params(sample_server_params, "test_tool")
-
-    assert (
-        adapter.return_value_as_string(
-            [
-                TextContent(
-                    text="this is a sample text",
-                    type="text",
-                    annotations=Annotations(audience=["user", "assistant"], priority=0.7),
-                ),
-                ImageContent(
-                    data="this is a sample base64 encoded image",
-                    mimeType="image/png",
-                    type="image",
-                    annotations=None,
-                ),
-                EmbeddedResource(
-                    type="resource",
-                    resource=TextResourceContents(
-                        text="this is a sample text",
-                        uri=AnyUrl(url="http://example.com/test"),
-                    ),
-                    annotations=Annotations(audience=["user"], priority=0.3),
-                ),
-            ]
-        )
-        == '[{"type": "text", "text": "this is a sample text", "annotations": {"audience": ["user", "assistant"], "priority": 0.7}}, {"type": "image", "data": "this is a sample base64 encoded image", "mimeType": "image/png", "annotations": null}, {"type": "resource", "resource": {"uri": "http://example.com/test", "mimeType": null, "text": "this is a sample text"}, "annotations": {"audience": ["user"], "priority": 0.3}}]'
-    )
-
-
 @pytest.mark.asyncio
 async def test_adapter_from_factory(
     sample_tool: Tool,
@@ -476,8 +421,7 @@ async def test_mcp_server_github() -> None:
     assert len(tools) == 1
     tool = tools[0]
     result = await tool.run_json(
-        {"owner": "microsoft", "repo": "autogen", "path": "python", "branch": "main"},
-        CancellationToken(),
+        {"owner": "microsoft", "repo": "autogen", "path": "python", "branch": "main"}, CancellationToken()
     )
     assert result is not None