diff --git a/python/packages/core/tests/core/test_mcp.py b/python/packages/core/tests/core/test_mcp.py
index 30a44ec87c4..2856c64e91c 100644
--- a/python/packages/core/tests/core/test_mcp.py
+++ b/python/packages/core/tests/core/test_mcp.py
@@ -4241,7 +4241,7 @@ async def test_streamable_http_integration():
 
     async with tool:
         # Test that we can connect and load tools
-        assert tool.session is not None
+        assert tool.is_connected is True
         assert isinstance(tool.functions, list)
 
         # If there are functions available, try to get information about one
@@ -4274,7 +4274,7 @@ async def test_mcp_connection_reset_integration():
 
     async with tool:
         # Verify initial connection
-        assert tool.session is not None
+        assert tool._connection is not None
         assert tool.is_connected is True
         assert len(tool.functions) > 0, "The MCP server should have at least one function."
 
@@ -4284,10 +4284,10 @@ async def test_mcp_connection_reset_integration():
         assert first_result is not None
         assert len(first_result) > 0
 
-        # Store the original session and exit stack for comparison
-        original_session = tool.session
+        # Store the original connection and exit stack for comparison
+        original_connection = tool._connection
         original_exit_stack = tool._exit_stack
-        original_call_tool = tool.session.call_tool
+        original_call_tool = original_connection.call_tool
 
         # Simulate connection failure by making call_tool raise ClosedResourceError once
         call_count = 0
@@ -4303,16 +4303,16 @@ async def call_tool_with_error(*args, **kwargs):
             # After reconnection, delegate to the original method
             return await original_call_tool(*args, **kwargs)
 
-        tool.session.call_tool = call_tool_with_error  # type: ignore[method-assign]  # ty: ignore[invalid-assignment]
+        original_connection.call_tool = call_tool_with_error  # type: ignore[method-assign]  # ty: ignore[invalid-assignment]
 
         # Invoke the function again - this should trigger automatic reconnection on ClosedResourceError
         second_result = _mcp_result_to_text(await func.invoke(query="What is Agent Framework?"))
         assert second_result is not None
         assert len(second_result) > 0
 
-        # Verify we have a new session and exit stack after reconnection
-        assert tool.session is not None
-        assert tool.session is not original_session, "Session should be replaced after reconnection"
+        # Verify we have a new connection and exit stack after reconnection
+        assert tool._connection is not None
+        assert tool._connection is not original_connection, "Connection should be replaced after reconnection"
         assert tool._exit_stack is not original_exit_stack, "Exit stack should be replaced after reconnection"
         assert tool.is_connected is True
 
diff --git a/python/scripts/local_mcp_streamable_http_server.py b/python/scripts/local_mcp_streamable_http_server.py
index 772b7e4161e..6eba826c3cf 100644
--- a/python/scripts/local_mcp_streamable_http_server.py
+++ b/python/scripts/local_mcp_streamable_http_server.py
@@ -8,7 +8,7 @@
 import asyncio
 from collections.abc import Sequence
 
-from mcp.server.fastmcp import FastMCP
+from mcp.server.mcpserver import MCPServer
 from starlette.requests import Request
 from starlette.responses import JSONResponse, Response
 
@@ -29,14 +29,11 @@ def _normalize_mount_path(path: str) -> str:
     return normalized.rstrip("/") or "/"
 
 
-def create_server(*, host: str, port: int, mount_path: str) -> FastMCP:
+def create_server(*, mount_path: str) -> MCPServer:
     """Create the local MCP integration test server."""
-    server = FastMCP(
+    server = MCPServer(
         name=SERVER_NAME,
         instructions="Deterministic local MCP server used by Agent Framework integration tests.",
-        host=host,
-        port=port,
-        streamable_http_path=mount_path,
         log_level="INFO",
     )
 
@@ -55,6 +52,7 @@ async def healthz(_request: Request) -> Response:
     @server.tool(
         name="search_agent_framework_docs",
         description="Return deterministic Agent Framework documentation text for MCP integration tests.",
+        structured_output=False,
     )
     def search_agent_framework_docs(query: str) -> str:
         """Return a deterministic response for the MCP integration tests."""
@@ -83,12 +81,14 @@ def parse_args(argv: Sequence[str] | None = None) -> argparse.Namespace:
 def main(argv: Sequence[str] | None = None) -> None:
     """Start the local MCP streamable HTTP server."""
     args = parse_args(argv)
-    server = create_server(
+    mount_path = _normalize_mount_path(args.mount_path)
+    server = create_server(mount_path=mount_path)
+    server.run(
+        transport="streamable-http",
         host=args.host,
         port=args.port,
-        mount_path=_normalize_mount_path(args.mount_path),
+        streamable_http_path=mount_path,
     )
-    server.run(transport="streamable-http")
 
 
 if __name__ == "__main__":