chore: import upstream snapshot with attribution

tests/server/test_lowlevel_tool_annotations.py

@@ -0,0 +1,44 @@
+"""Tests for tool annotations in low-level server."""
+
+import pytest
+from mcp_types import ListToolsResult, PaginatedRequestParams, Tool, ToolAnnotations
+
+from mcp import Client
+from mcp.server import Server, ServerRequestContext
+
+
+@pytest.mark.anyio
+async def test_lowlevel_server_tool_annotations():
+    """Test that tool annotations work in low-level server."""
+
+    async def handle_list_tools(ctx: ServerRequestContext, params: PaginatedRequestParams | None) -> ListToolsResult:
+        return ListToolsResult(
+            tools=[
+                Tool(
+                    name="echo",
+                    description="Echo a message back",
+                    input_schema={
+                        "type": "object",
+                        "properties": {
+                            "message": {"type": "string"},
+                        },
+                        "required": ["message"],
+                    },
+                    annotations=ToolAnnotations(
+                        title="Echo Tool",
+                        read_only_hint=True,
+                    ),
+                )
+            ]
+        )
+
+    server = Server("test", on_list_tools=handle_list_tools)
+
+    async with Client(server) as client:
+        tools_result = await client.list_tools()
+
+        assert len(tools_result.tools) == 1
+        assert tools_result.tools[0].name == "echo"
+        assert tools_result.tools[0].annotations is not None
+        assert tools_result.tools[0].annotations.title == "Echo Tool"
+        assert tools_result.tools[0].annotations.read_only_hint is True