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 488984ede072..a8a5e00e9790 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
@@ -7,7 +7,9 @@
 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
@@ -115,6 +117,27 @@ 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 10f17c2c35e0..5d9897ac6721 100644
--- a/python/packages/autogen-ext/tests/tools/test_mcp_tools.py
+++ b/python/packages/autogen-ext/tests/tools/test_mcp_tools.py
@@ -16,6 +16,14 @@
     mcp_server_tools,
 )
 from mcp import ClientSession, Tool
+from mcp.types import (
+    AnyUrl,
+    Annotations,
+    EmbeddedResource,
+    ImageContent,
+    TextContent,
+    TextResourceContents,
+)
 
 
 @pytest.fixture
@@ -182,6 +190,53 @@ 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,
@@ -421,7 +476,8 @@ 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