Add initScript capability

Author: gernberg

src/tools/pages.ts

@@ -116,6 +116,9 @@ export const navigatePage = defineTool({
       .boolean()
       .optional()
       .describe('Whether to ignore cache on reload.'),
+    initScript: zod.string().optional().describe(
+      `(optional) A JavaScript function declaration to be executed by the tool on new document for every page load.
+      `),
     ...timeoutSchema,
   },
   handler: async (request, response, context) => {
@@ -132,6 +135,10 @@ export const navigatePage = defineTool({
       request.params.type = 'url';
     }
 
+    if(request.params.initScript){
+      page.evaluateOnNewDocument(request.params.initScript);
+    }
+
     await context.waitForEventsAfterAction(async () => {
       switch (request.params.type) {
         case 'url':