update tools and prompts to add functionality for 'starring' emails

src/tools/tools-email.ts

@@ -56,7 +56,7 @@ server.registerTool(
         description:
             "Fetch unread emails from a Gmail inbox. Returns sender, date, " +
             "subject, message ID, and body text for each message. The message IDs " +
-            "can be passed to delete_emails later. Specify which account to fetch from.",
+            "must be passed to star_emails after evaluation. Specify which account to fetch from.",
         inputSchema: {
             account: accountSchema,
             maxResults: z
@@ -303,3 +303,58 @@ server.registerTool(
         }
     }
 );
+// --------------------------------------------------------------------------- //
+// Tool: star_emails
+// --------------------------------------------------------------------------- //
+server.registerTool(
+    "star_emails",
+    {
+        description: "Mark reviewed emails with a star and mark them as read in Gmail. " +
+            "Use this for all reviewed messages (Categories A, B, C, and D) " +
+            "to signal they have been processed. Specify which account the emails belong to.",
+        inputSchema: {
+            account: accountSchema,
+            messageIds: z
+                .array(z.string())
+                .describe("Array of Gmail message IDs to star and mark read"),
+        },
+    },
+    async ({ account, messageIds }) => {
+        try {
+            if (messageIds.length === 0) {
+                return { content: [{ type: "text" as const, text: "No message IDs provided." }] };
+            }
+
+            const gmail = getGmailClient(account);
+
+            // Batch modify allows updating up to 1000 messages in a single API call
+            await gmail.users.messages.batchModify({
+                userId: "me",
+                requestBody: {
+                    ids: messageIds,
+                    addLabelIds: ["STARRED"],
+                    removeLabelIds: ["UNREAD"]
+                }
+            });
+
+            return {
+                content: [
+                    {
+                        type: "text" as const,
+                        text: `Successfully starred and marked read ${messageIds.length} email(s).`,
+                    },
+                ],
+            };
+        } catch (error) {
+            const errMsg = error instanceof Error ? error.message : String(error);
+            return {
+                content: [
+                    {
+                        type: "text" as const,
+                        text: `Error starring emails: ${errMsg}`,
+                    },
+                ],
+            };
+        }
+    }
+);