chore: import upstream snapshot with attribution

examples/stories/standalone_get/server.py

@@ -0,0 +1,30 @@
+"""Sessionful Streamable HTTP: a tool mutates resources and emits `list_changed` over the standalone GET stream."""
+
+import itertools
+
+from mcp.server.mcpserver import Context, MCPServer
+from mcp.server.mcpserver.resources import TextResource
+from stories._hosting import run_server_from_args
+
+
+def build_server() -> MCPServer:
+    mcp = MCPServer("standalone-get-example")
+    counter = itertools.count(1)
+
+    mcp.add_resource(TextResource(uri="note://initial", name="initial", text="initial content"))
+
+    @mcp.tool()
+    async def add_note(content: str, ctx: Context) -> str:
+        """Register a new resource and announce it via `notifications/resources/list_changed`."""
+        name = f"note-{next(counter)}"
+        mcp.add_resource(TextResource(uri=f"note://{name}", name=name, text=content))
+        # MCPServer does not auto-emit on add_resource; send explicitly. With no
+        # related_request_id this routes to the standalone GET stream.
+        await ctx.session.send_resource_list_changed()
+        return f"registered {name}"
+
+    return mcp
+
+
+if __name__ == "__main__":
+    run_server_from_args(build_server)