diff --git a/src/cmd/go/internal/cfg/tailscale.go b/src/cmd/go/internal/cfg/tailscale.go
new file mode 100644
index 00000000000000..859d3da9f8b2e2
--- /dev/null
+++ b/src/cmd/go/internal/cfg/tailscale.go
@@ -0,0 +1,9 @@
+// Copyright 2026 Tailscale Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package cfg
+
+func init() {
+	BuildContext.ToolTags = append(BuildContext.ToolTags, "tailscale_go")
+}