diff --git a/_demo/go/gobuild/demo.go b/_demo/go/gobuild/demo.go
index 07626212..70cb4700 100644
--- a/_demo/go/gobuild/demo.go
+++ b/_demo/go/gobuild/demo.go
@@ -10,6 +10,23 @@ import (
 
 func main() {
 	fmt.Printf("runtime.Compiler = %q\n", runtime.Compiler)
+
+	ctx := build.Default
+	fmt.Printf("build.Default.Compiler = %q\n", ctx.Compiler)
+	if ctx.Compiler != "gc" {
+		panic(fmt.Sprintf("expected build.Default.Compiler to be \"gc\", got %q", ctx.Compiler))
+	}
+
+	if len(ctx.ToolTags) == 0 {
+		panic("expected build.Default.ToolTags to be non-empty")
+	}
+	fmt.Printf("build.Default.ToolTags = %v\n", ctx.ToolTags)
+
+	if len(ctx.ReleaseTags) == 0 {
+		panic("expected build.Default.ReleaseTags to be non-empty")
+	}
+	fmt.Printf("build.Default.ReleaseTags count = %d\n", len(ctx.ReleaseTags))
+
 	pkg, err := build.Import("fmt", "", build.FindOnly)
 	if err != nil {
 		panic(err)
diff --git a/runtime/internal/lib/go/build/build.go b/runtime/internal/lib/go/build/build.go
index f27fb381..f39fc8bb 100644
--- a/runtime/internal/lib/go/build/build.go
+++ b/runtime/internal/lib/go/build/build.go
@@ -23,6 +23,9 @@ type Context = build.Context
 //go:linkname cgoSupported internal/platform.CgoSupported
 func cgoSupported(goos, goarch string) bool
 
+//go:linkname toolTags internal/buildcfg.ToolTags
+var toolTags []string
+
 // defaultToolTags should be an internal detail,
 // but widely used packages access it using linkname.
 // Notable members of the hall of shame include:
@@ -131,10 +134,6 @@ func defaultGOPATH() string {
 }
 
 // buildToolTags returns the tool tags for the current build configuration.
-// This is a simplified version that returns basic tags.
 func buildToolTags() []string {
-	return []string{
-		"gc",
-		"goexperiment.boringcrypto",
-	}
+	return toolTags
 }