diff --git a/src/main.zig b/src/main.zig
index f06cf41e..dd6a759a 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -136,13 +136,12 @@ fn run(allocator: Allocator, main_arena: Allocator) !void {
 
             log.opts.format = .logfmt;
 
-            var stdout_buf: [4096]u8 = undefined;
-            var stdout = std.fs.File.stdout().writer(&stdout_buf);
+            var stdout = std.fs.File.stdout().writer(&.{});
 
-            var mcp_server = try lp.mcp.Server.init(allocator, app, &stdout.interface);
+            var mcp_server: *lp.mcp.Server = try .init(allocator, app, &stdout.interface);
             defer mcp_server.deinit();
 
-            var stdin_buf: [4096]u8 = undefined;
+            var stdin_buf: [64 * 1024]u8 = undefined;
             var stdin = std.fs.File.stdin().reader(&stdin_buf);
 
             try lp.mcp.router.processRequests(mcp_server, &stdin.interface);
diff --git a/src/mcp/Server.zig b/src/mcp/Server.zig
index e1e94a0e..b76075fb 100644
--- a/src/mcp/Server.zig
+++ b/src/mcp/Server.zig
@@ -58,6 +58,7 @@ pub fn sendResponse(self: *Self, response: anytype) !void {
     try std.json.Stringify.value(response, .{ .emit_null_optional_fields = false }, &aw.writer);
     try aw.writer.writeByte('\n');
     try self.writer.writeAll(aw.writer.buffered());
+    try self.writer.flush();
 }
 
 pub fn sendResult(self: *Self, id: std.json.Value, result: anytype) !void {