diff --git a/internal/handler/agentic_probe_batch_21.go b/internal/handler/agentic_probe_batch_21.go
new file mode 100644
index 0000000..88f9b6f
--- /dev/null
+++ b/internal/handler/agentic_probe_batch_21.go
@@ -0,0 +1,19 @@
+package handler
+
+import (
+	"context"
+	"net/http"
+
+	"golang.org/x/sync/semaphore"
+)
+
+func AgenticProbeBatch21(w http.ResponseWriter, r *http.Request) error {
+	sem := semaphore.NewWeighted(1)
+	if err := sem.Acquire(context.Background(), 1); err != nil {
+		return err
+	}
+	if err := sem.Acquire(context.Background(), 1); err != nil {
+		return nil
+	}
+	return nil
+}