feat(gmail): add detectReplies operation for thread reply tracking

src/tools/listTools.ts

@@ -261,6 +261,12 @@ export async function generateToolStructure(): Promise<ModuleStructure> {
         description: 'Send templated emails to multiple recipients with per-recipient variable substitution and configurable delay between sends (default 5000ms). Set dryRun: true to preview all rendered emails without sending. Returns { sent, failed, results?, previews? }.',
         example: 'const result = await gmail.sendBatch({ subject: "Hi {{name}}", template: "Hello {{name}}, {{note}}", recipients: [{ to: "alice@example.com", variables: { name: "Alice", note: "checking in" } }, { to: "bob@example.com", variables: { name: "Bob", note: "quick update" } }], delayMs: 5000 });\nconsole.log(`Sent: ${result.sent}, Failed: ${result.failed}`);',
       },
+      {
+        name: 'detectReplies',
+        signature: 'detectReplies({ threadIds: string[] })',
+        description: 'Check an array of Gmail thread IDs for replies from external participants. Filters out messages sent by the authenticated user to identify genuine inbound replies. Useful for tracking campaign response rates.',
+        example: 'const { threads } = await gmail.detectReplies({ threadIds: ["thread1", "thread2"] });\nconst replied = threads.filter(t => t.hasReply);\nconsole.log(`${replied.length} of ${threads.length} threads have replies`);',
+      },
       {
         name: 'listDrafts',
         signature: 'listDrafts({ maxResults?: number, pageToken?: string })',