chore: import upstream snapshot with attribution

examples/stories/standalone_get/server_lowlevel.py

@@ -0,0 +1,49 @@
+"""Sessionful Streamable HTTP (lowlevel `Server`): tool-triggered `list_changed` over the standalone GET stream."""
+
+import itertools
+from typing import Any
+
+import mcp_types as types
+
+from mcp.server.context import ServerRequestContext
+from mcp.server.lowlevel import Server
+from stories._hosting import run_server_from_args
+
+ADD_NOTE_INPUT_SCHEMA: dict[str, Any] = {
+    "type": "object",
+    "properties": {"content": {"type": "string"}},
+    "required": ["content"],
+}
+
+
+def build_server() -> Server[Any]:
+    counter = itertools.count(1)
+    resources: list[types.Resource] = [types.Resource(uri="note://initial", name="initial", mime_type="text/plain")]
+
+    async def list_tools(
+        ctx: ServerRequestContext[Any], params: types.PaginatedRequestParams | None
+    ) -> types.ListToolsResult:
+        return types.ListToolsResult(tools=[types.Tool(name="add_note", input_schema=ADD_NOTE_INPUT_SCHEMA)])
+
+    async def list_resources(
+        ctx: ServerRequestContext[Any], params: types.PaginatedRequestParams | None
+    ) -> types.ListResourcesResult:
+        return types.ListResourcesResult(resources=list(resources))
+
+    async def call_tool(ctx: ServerRequestContext[Any], params: types.CallToolRequestParams) -> types.CallToolResult:
+        assert params.name == "add_note" and params.arguments is not None
+        name = f"note-{next(counter)}"
+        resources.append(types.Resource(uri=f"note://{name}", name=name, mime_type="text/plain"))
+        await ctx.session.send_resource_list_changed()
+        return types.CallToolResult(content=[types.TextContent(text=f"registered {name}")])
+
+    return Server(
+        "standalone-get-example",
+        on_list_tools=list_tools,
+        on_list_resources=list_resources,
+        on_call_tool=call_tool,
+    )
+
+
+if __name__ == "__main__":
+    run_server_from_args(build_server)