chore: move state to tab, do not cache snapshot (#730)

src/tools/pdf.ts

@@ -15,7 +15,7 @@
  */
 
 import { z } from 'zod';
-import { defineTool } from './tool.js';
+import { defineTabTool } from './tool.js';
 
 import * as javascript from '../javascript.js';
 import { outputFile } from '../config.js';
@@ -24,7 +24,7 @@ const pdfSchema = z.object({
   filename: z.string().optional().describe('File name to save the pdf to. Defaults to `page-{timestamp}.pdf` if not specified.'),
 });
 
-const pdf = defineTool({
+const pdf = defineTabTool({
   capability: 'pdf',
 
   schema: {
@@ -35,9 +35,8 @@ const pdf = defineTool({
     type: 'readOnly',
   },
 
-  handle: async (context, params) => {
-    const tab = context.currentTabOrDie();
-    const fileName = await outputFile(context.config, params.filename ?? `page-${new Date().toISOString()}.pdf`);
+  handle: async (tab, params) => {
+    const fileName = await outputFile(tab.context.config, params.filename ?? `page-${new Date().toISOString()}.pdf`);
 
     const code = [
       `// Save page as ${fileName}`,