chore: infer tool params (#241)

Moves the `schema.parse` call to the calling side of the handler, so we
don't have to duplicate it everywhere.

tests/launch.spec.ts

@@ -26,6 +26,7 @@ test('test reopen browser', async ({ client }) => {
 
   expect(await client.callTool({
     name: 'browser_close',
+    arguments: {},
   })).toContainTextContent('No open pages available');
 
   expect(await client.callTool({