diff --git a/src/tools/navigate.ts b/src/tools/navigate.ts
index 08abe38..99af0d7 100644
--- a/src/tools/navigate.ts
+++ b/src/tools/navigate.ts
@@ -4,7 +4,7 @@ import type { Context } from "../context.js";
 import type { ToolActionResult } from "../types/types.js";
 
 const NavigateInputSchema = z.object({
-  url: z.string().min(1),
+  url: z.string().url(),
 });
 
 type NavigateInput = z.infer<typeof NavigateInputSchema>;