804 lines
25 KiB
TypeScript
804 lines
25 KiB
TypeScript
import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
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import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
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import { z } from "zod";
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import { google, gmail_v1, sheets_v4, calendar_v3 } from "googleapis";
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import { OAuth2Client } from "google-auth-library";
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import fs from "fs";
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import path from "path";
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// ---------------------------------------------------------------------------
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// Paths — resolved relative to the compiled build/ directory, up one level
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// to the project root where credentials.json, token.json, and summary.json live.
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// ---------------------------------------------------------------------------
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const __dirname = path.dirname(new URL(import.meta.url).pathname);
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const PROJECT_ROOT = path.resolve(__dirname, "..");
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const CREDENTIALS_PATH = path.join(PROJECT_ROOT, "credentials.json");
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const ACCOUNTS_PATH = path.join(PROJECT_ROOT, "accounts.json");
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const CLASSIFY_PROMPT_PATH = path.join(PROJECT_ROOT, "classify-emails.txt");
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const ACTION_PROMPT_PATH = path.join(
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PROJECT_ROOT, "src", "prompts", "take-action-on-emails.txt"
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);
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// ---------------------------------------------------------------------------
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// Account configuration
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// ---------------------------------------------------------------------------
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interface AccountConfig {
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label: string;
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tokenFile: string;
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spreadsheetId?: string;
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calendarId?: string;
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}
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interface AccountsMap {
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[key: string]: AccountConfig;
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}
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function loadAccounts(): AccountsMap {
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if (!fs.existsSync(ACCOUNTS_PATH)) {
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throw new Error(`Missing accounts.json at ${ACCOUNTS_PATH}.`);
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}
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return JSON.parse(fs.readFileSync(ACCOUNTS_PATH, "utf-8"));
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}
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function getTokenPath(account: string): string {
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const accounts = loadAccounts();
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const acct = accounts[account];
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if (!acct) {
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const available = Object.keys(accounts).join(", ");
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throw new Error(
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`Unknown account "${account}". Available accounts: ${available}`
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);
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}
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return path.join(PROJECT_ROOT, acct.tokenFile);
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}
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function getSummaryPath(account: string): string {
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if (account === "work") {
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return path.join(PROJECT_ROOT, "summary.json");
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}
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return path.join(PROJECT_ROOT, `summary-${account}.json`);
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}
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const VALID_ACCOUNTS = ["work", "secondary"] as const;
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const accounts = loadAccounts();
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const accountDescription = VALID_ACCOUNTS
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.map((key) => `"${key}" (${accounts[key]?.label ?? key})`)
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.join(" or ");
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const accountSchema = z
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.enum(VALID_ACCOUNTS)
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.describe(`Which email account to use: ${accountDescription}`);
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// ---------------------------------------------------------------------------
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// Prompt loaders
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// ---------------------------------------------------------------------------
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function loadPromptFile(filePath: string, label: string): string {
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if (!fs.existsSync(filePath)) {
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console.error(`Warning: ${filePath} not found. ${label} will be missing.`);
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return "";
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}
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return fs.readFileSync(filePath, "utf-8");
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}
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function loadClassificationPrompt(): string {
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return loadPromptFile(CLASSIFY_PROMPT_PATH, "Classification instructions");
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}
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function loadActionPrompt(): string {
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return loadPromptFile(ACTION_PROMPT_PATH, "Action instructions");
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}
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// ---------------------------------------------------------------------------
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// Auth helpers — generic OAuth2 client, then service-specific factories
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// ---------------------------------------------------------------------------
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function getOAuth2Client(account: string): OAuth2Client {
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const tokenPath = getTokenPath(account);
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if (!fs.existsSync(CREDENTIALS_PATH)) {
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throw new Error(
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`Missing credentials.json at ${CREDENTIALS_PATH}. Run "npm run auth" first.`
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);
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}
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if (!fs.existsSync(tokenPath)) {
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throw new Error(
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`Missing token file at ${tokenPath} for account "${account}". Run "npm run auth" first.`
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);
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}
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const credentials = JSON.parse(fs.readFileSync(CREDENTIALS_PATH, "utf-8"));
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const { client_id, client_secret, redirect_uris } =
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credentials.installed || credentials.web;
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const oAuth2Client = new google.auth.OAuth2(
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client_id,
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client_secret,
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redirect_uris[0]
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);
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const token = JSON.parse(fs.readFileSync(tokenPath, "utf-8"));
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oAuth2Client.setCredentials(token);
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oAuth2Client.on("tokens", (newTokens) => {
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const current = JSON.parse(fs.readFileSync(tokenPath, "utf-8"));
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fs.writeFileSync(
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tokenPath,
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JSON.stringify({ ...current, ...newTokens }, null, 2)
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);
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console.error(`Token refreshed and saved for account "${account}".`);
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});
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return oAuth2Client;
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}
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function getGmailClient(account: string): gmail_v1.Gmail {
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return google.gmail({ version: "v1", auth: getOAuth2Client(account) });
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}
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function getSheetsClient(account: string): sheets_v4.Sheets {
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return google.sheets({ version: "v4", auth: getOAuth2Client(account) });
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}
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function getCalendarClient(account: string): calendar_v3.Calendar {
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return google.calendar({ version: "v3", auth: getOAuth2Client(account) });
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}
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function getSpreadsheetId(account: string): string {
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const acct = accounts[account];
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if (!acct?.spreadsheetId || acct.spreadsheetId === "PASTE_YOUR_SHEET_ID_HERE") {
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throw new Error(
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`No spreadsheetId configured for account "${account}" in accounts.json.`
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);
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}
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return acct.spreadsheetId;
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}
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function getCalendarId(account: string): string {
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return accounts[account]?.calendarId ?? "primary";
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}
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// ---------------------------------------------------------------------------
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// Email parsing helpers
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// ---------------------------------------------------------------------------
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function getHeader(
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headers: gmail_v1.Schema$MessagePartHeader[] | undefined,
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name: string
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): string {
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if (!headers) return "";
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const header = headers.find(
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(h) => h.name?.toLowerCase() === name.toLowerCase()
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);
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return header?.value ?? "";
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}
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function decodeBody(message: gmail_v1.Schema$Message): string {
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const parts = message.payload?.parts;
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let encoded = "";
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if (parts) {
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// Multipart message — prefer text/plain
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const textPart = parts.find((p) => p.mimeType === "text/plain");
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encoded = textPart?.body?.data ?? "";
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// Fallback to text/html if no plain text
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if (!encoded) {
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const htmlPart = parts.find((p) => p.mimeType === "text/html");
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encoded = htmlPart?.body?.data ?? "";
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}
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} else {
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// Single-part message
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encoded = message.payload?.body?.data ?? "";
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}
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if (!encoded) {
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return message.snippet ?? "";
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}
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return Buffer.from(encoded, "base64url").toString("utf-8");
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}
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// ---------------------------------------------------------------------------
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// MCP Server
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// ---------------------------------------------------------------------------
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const server = new McpServer({
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name: "assistant",
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version: "1.0.0",
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});
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// ---------------------------------------------------------------------------
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// Prompt: review_emails (work account)
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// ---------------------------------------------------------------------------
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server.registerPrompt(
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"review_emails",
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{
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description:
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`Review WORK inbox (${accounts.work?.label ?? "work"}): classify emails, delete A+C, summarize B+D, log B to spreadsheet, create calendar events.`,
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},
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() => {
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const phase1 = loadClassificationPrompt();
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const phase2 = loadActionPrompt();
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return {
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messages: [
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{
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role: "user" as const,
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content: {
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type: "text" as const,
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text:
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`ACCOUNT: Use account = "work" for ALL tool calls in this session.\n\n` +
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(phase1 || "Review my new emails and classify them by job application category.") +
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(phase2 ? `\n\n${phase2}` : ""),
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},
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},
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],
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};
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}
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);
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// ---------------------------------------------------------------------------
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// Prompt: review_secondary_emails (secondary account)
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// ---------------------------------------------------------------------------
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server.registerPrompt(
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"review_secondary_emails",
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{
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description:
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`Review SECONDARY inbox (${accounts.secondary?.label ?? "secondary"}): classify emails, delete A+C, summarize B+D, log B to spreadsheet, create calendar events.`,
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},
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() => {
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const phase1 = loadClassificationPrompt();
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const phase2 = loadActionPrompt();
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return {
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messages: [
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{
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role: "user" as const,
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content: {
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type: "text" as const,
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text:
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`ACCOUNT: Use account = "secondary" for ALL tool calls in this session.\n\n` +
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(phase1 || "Review my new emails and classify them by job application category.") +
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(phase2 ? `\n\n${phase2}` : ""),
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},
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},
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],
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};
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}
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);
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// ---------------------------------------------------------------------------
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// Tool: fetch_new_emails
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// ---------------------------------------------------------------------------
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server.registerTool(
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"fetch_new_emails",
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{
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description:
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"Fetch unread emails from a Gmail inbox. Returns sender, date, " +
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"subject, message ID, and body text for each message. The message IDs " +
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"can be passed to delete_emails later. Specify which account to fetch from.",
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inputSchema: {
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account: accountSchema,
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maxResults: z
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.number()
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.min(1)
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.max(100)
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.describe("Maximum number of unread emails to fetch (1-100)"),
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},
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},
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async ({ account, maxResults }) => {
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try {
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const gmail = getGmailClient(account);
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const listResponse = await gmail.users.messages.list({
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userId: "me",
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q: "is:unread",
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maxResults,
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});
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const messageIds = listResponse.data.messages ?? [];
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if (messageIds.length === 0) {
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return {
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content: [{ type: "text" as const, text: "No unread emails found." }],
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};
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}
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const emails: string[] = [];
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for (const msg of messageIds) {
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const detail = await gmail.users.messages.get({
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userId: "me",
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id: msg.id!,
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format: "full",
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});
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const headers = detail.data.payload?.headers;
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const from = getHeader(headers, "From");
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const subject = getHeader(headers, "Subject");
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const date = getHeader(headers, "Date");
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const body = decodeBody(detail.data);
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// Truncate body to avoid overwhelming the context window
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const truncatedBody =
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body.length > 2000 ? body.substring(0, 2000) + "\n[...truncated]" : body;
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emails.push(
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[
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`MESSAGE_ID: ${msg.id}`,
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`FROM: ${from}`,
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`DATE: ${date}`,
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`SUBJECT: ${subject}`,
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`BODY:\n${truncatedBody}`,
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].join("\n")
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);
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}
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const classificationInstructions = loadClassificationPrompt();
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const actionInstructions = loadActionPrompt();
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const instructionsBlock =
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(classificationInstructions
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? `\n\n${"=".repeat(60)}\nCLASSIFICATION INSTRUCTIONS (PHASE 1):\n${"=".repeat(60)}\n${classificationInstructions}`
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: "") +
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(actionInstructions
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? `\n\n${"=".repeat(60)}\nACTION INSTRUCTIONS (PHASE 2):\n${"=".repeat(60)}\n${actionInstructions}`
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: "");
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return {
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content: [
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{
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type: "text" as const,
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text:
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`Found ${emails.length} unread email(s):\n\n` +
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`${"=".repeat(60)}\n${emails.join(`\n${"=".repeat(60)}\n`)}` +
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instructionsBlock,
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},
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],
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};
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} catch (error) {
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const errMsg = error instanceof Error ? error.message : String(error);
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return {
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content: [
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{
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type: "text" as const,
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text: `Error fetching emails: ${errMsg}`,
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},
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],
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};
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}
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}
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);
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// ---------------------------------------------------------------------------
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// Tool: delete_emails
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// ---------------------------------------------------------------------------
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server.registerTool(
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"delete_emails",
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{
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description:
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"Move emails to trash by their Gmail message IDs. Use this for " +
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"category A (acknowledgements) and category C (rejections) emails. " +
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"Specify which account the emails belong to.",
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inputSchema: {
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account: accountSchema,
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messageIds: z
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.array(z.string())
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.describe("Array of Gmail message IDs to move to trash"),
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},
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},
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async ({ account, messageIds }) => {
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try {
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const gmail = getGmailClient(account);
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const results: string[] = [];
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for (const id of messageIds) {
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try {
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await gmail.users.messages.trash({
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userId: "me",
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id,
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});
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results.push(`Trashed: ${id}`);
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} catch (err) {
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const errMsg = err instanceof Error ? err.message : String(err);
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results.push(`Failed to trash ${id}: ${errMsg}`);
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}
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}
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return {
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content: [
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{
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type: "text" as const,
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text: `Delete results:\n${results.join("\n")}`,
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},
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],
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};
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} catch (error) {
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const errMsg = error instanceof Error ? error.message : String(error);
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return {
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content: [
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{
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type: "text" as const,
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text: `Error deleting emails: ${errMsg}`,
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},
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],
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};
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}
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}
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);
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// ---------------------------------------------------------------------------
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// Tool: append_to_summary
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// ---------------------------------------------------------------------------
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interface SummaryEntry {
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senderName: string;
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senderEmail: string;
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dateReceived: string;
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subject: string;
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category: "B" | "D";
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addedAt: string;
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}
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server.registerTool(
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"append_to_summary",
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{
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description:
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"Append classified email entries to the local summary file. Use this " +
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"for category B (advancement to next step) and category D (other) emails. " +
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"Each entry records the sender, date, subject, and category. " +
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"Specify which account the emails belong to.",
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inputSchema: {
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account: accountSchema,
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entries: z
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.array(
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z.object({
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senderName: z.string().describe("Name of the sender"),
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senderEmail: z.string().describe("Email address of the sender"),
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dateReceived: z
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.string()
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.describe("Date and time the email was received"),
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subject: z.string().describe("Email subject line"),
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category: z
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.enum(["B", "D"])
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.describe(
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"Category: B = advancement to next step, D = other/uncategorized"
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),
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})
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)
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.describe("Array of email summary entries to append"),
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},
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},
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async ({ account, entries }) => {
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try {
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const summaryPath = getSummaryPath(account);
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// Load existing summary or start fresh
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let summary: SummaryEntry[] = [];
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if (fs.existsSync(summaryPath)) {
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summary = JSON.parse(fs.readFileSync(summaryPath, "utf-8"));
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}
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const now = new Date();
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const nowIso = now.toISOString();
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const newEntries: SummaryEntry[] = entries.map((e) => ({
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...e,
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addedAt: nowIso,
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}));
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summary.push(...newEntries);
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// Purge entries older than 30 days
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const RETENTION_MS = 30 * 24 * 60 * 60 * 1000;
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const cutoff = now.getTime() - RETENTION_MS;
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const beforePurge = summary.length;
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summary = summary.filter(
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(entry) => new Date(entry.addedAt).getTime() >= cutoff
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);
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const purged = beforePurge - summary.length;
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fs.writeFileSync(summaryPath, JSON.stringify(summary, null, 2));
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const purgeNote = purged > 0
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? `\nPurged ${purged} entry/entries older than 30 days.`
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: "";
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return {
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content: [
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{
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type: "text" as const,
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text:
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`Appended ${newEntries.length} entry/entries to summary.\n` +
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`Total entries in summary: ${summary.length}\n` +
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`Summary file: ${summaryPath}` +
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purgeNote,
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},
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],
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};
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} catch (error) {
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const errMsg = error instanceof Error ? error.message : String(error);
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return {
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content: [
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{
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type: "text" as const,
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text: `Error appending to summary: ${errMsg}`,
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},
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],
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};
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}
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}
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);
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// ---------------------------------------------------------------------------
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// Sheet column layout for "Recruiter Communication Log and Call Schedule"
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// ---------------------------------------------------------------------------
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const SHEET_COLUMNS = [
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"Recruiter Name", // A
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"Recruiter Email", // B
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"Recruiter Tel", // C
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"Company/Role", // D
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"First Contact", // E
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"Subsequent Contact(s)", // F
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"Recruiter Call Scheduled", // G
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"Company Contact Info", // H
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"Company First Interview", // I
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"Company Second Interview", // J
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];
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const SHEET_RANGE = "Sheet1";
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// ---------------------------------------------------------------------------
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// Tool: log_recruiter_contact
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// ---------------------------------------------------------------------------
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server.registerTool(
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"log_recruiter_contact",
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{
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description:
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"Log or update recruiter contact info in the tracking spreadsheet. " +
|
|
"If a row already exists for the same recruiterEmail + companyRole, it " +
|
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"updates the existing row (merging non-empty fields). Otherwise appends " +
|
|
"a new row. Use for Category B emails after classification.",
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inputSchema: {
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account: accountSchema,
|
|
recruiterName: z.string().describe("Recruiter's full name"),
|
|
recruiterEmail: z.string().describe("Recruiter's email address"),
|
|
recruiterTel: z
|
|
.string()
|
|
.optional()
|
|
.describe("Recruiter's phone number, if mentioned in the email"),
|
|
companyRole: z
|
|
.string()
|
|
.describe("Company name and role the recruiter seeks to fill"),
|
|
firstContact: z
|
|
.string()
|
|
.describe("Date/time of first contact (from the email's Date header)"),
|
|
subsequentContacts: z
|
|
.string()
|
|
.optional()
|
|
.describe("Any follow-up contact context mentioned in the email"),
|
|
recruiterCallScheduled: z
|
|
.string()
|
|
.optional()
|
|
.describe(
|
|
"Scheduled call details: date, time, platform (Zoom/Teams), " +
|
|
"meeting link or phone, and whether they have your cell number"
|
|
),
|
|
companyContactInfo: z
|
|
.string()
|
|
.optional()
|
|
.describe("Company interviewer name/email/tel if advancing to company interview"),
|
|
companyFirstInterview: z
|
|
.string()
|
|
.optional()
|
|
.describe("Company first interview: date, time, platform, link/phone, cell number note"),
|
|
companySecondInterview: z
|
|
.string()
|
|
.optional()
|
|
.describe("Company second interview: date, time, platform, link/phone, cell number note"),
|
|
},
|
|
},
|
|
async ({
|
|
account,
|
|
recruiterName,
|
|
recruiterEmail,
|
|
recruiterTel,
|
|
companyRole,
|
|
firstContact,
|
|
subsequentContacts,
|
|
recruiterCallScheduled,
|
|
companyContactInfo,
|
|
companyFirstInterview,
|
|
companySecondInterview,
|
|
}) => {
|
|
try {
|
|
const sheets = getSheetsClient(account);
|
|
const spreadsheetId = getSpreadsheetId(account);
|
|
|
|
const incomingRow = [
|
|
recruiterName,
|
|
recruiterEmail,
|
|
recruiterTel ?? "",
|
|
companyRole,
|
|
firstContact,
|
|
subsequentContacts ?? "",
|
|
recruiterCallScheduled ?? "",
|
|
companyContactInfo ?? "",
|
|
companyFirstInterview ?? "",
|
|
companySecondInterview ?? "",
|
|
];
|
|
|
|
// Read existing data to check for a matching row
|
|
const existing = await sheets.spreadsheets.values.get({
|
|
spreadsheetId,
|
|
range: SHEET_RANGE,
|
|
});
|
|
const rows = existing.data.values ?? [];
|
|
|
|
// Find row matching recruiterEmail (col B) + companyRole (col D)
|
|
const emailNorm = recruiterEmail.toLowerCase().trim();
|
|
const roleNorm = companyRole.toLowerCase().trim();
|
|
let matchIdx = -1;
|
|
for (let i = 0; i < rows.length; i++) {
|
|
const rowEmail = (rows[i][1] ?? "").toString().toLowerCase().trim();
|
|
const rowRole = (rows[i][3] ?? "").toString().toLowerCase().trim();
|
|
if (rowEmail === emailNorm && rowRole === roleNorm) {
|
|
matchIdx = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (matchIdx >= 0) {
|
|
// Merge: keep existing values where incoming is empty
|
|
const existingRow = rows[matchIdx];
|
|
const merged = incomingRow.map((val, col) => {
|
|
if (col === 5 && val && existingRow[col]) {
|
|
// Subsequent Contacts: append rather than overwrite
|
|
return `${existingRow[col]}; ${val}`;
|
|
}
|
|
return val || existingRow[col] || "";
|
|
});
|
|
|
|
const rowNum = matchIdx + 1; // 1-indexed
|
|
await sheets.spreadsheets.values.update({
|
|
spreadsheetId,
|
|
range: `${SHEET_RANGE}!A${rowNum}:J${rowNum}`,
|
|
valueInputOption: "USER_ENTERED",
|
|
requestBody: { values: [merged] },
|
|
});
|
|
|
|
return {
|
|
content: [
|
|
{
|
|
type: "text" as const,
|
|
text: `Updated existing row ${rowNum} for ${recruiterName} / ${companyRole}.`,
|
|
},
|
|
],
|
|
};
|
|
}
|
|
|
|
// No match — append new row
|
|
await sheets.spreadsheets.values.append({
|
|
spreadsheetId,
|
|
range: SHEET_RANGE,
|
|
valueInputOption: "USER_ENTERED",
|
|
requestBody: { values: [incomingRow] },
|
|
});
|
|
|
|
return {
|
|
content: [
|
|
{
|
|
type: "text" as const,
|
|
text: `Appended new row for ${recruiterName} / ${companyRole}.`,
|
|
},
|
|
],
|
|
};
|
|
} catch (error) {
|
|
const errMsg = error instanceof Error ? error.message : String(error);
|
|
return {
|
|
content: [
|
|
{
|
|
type: "text" as const,
|
|
text: `Error logging recruiter contact: ${errMsg}`,
|
|
},
|
|
],
|
|
};
|
|
}
|
|
}
|
|
);
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Tool: create_calendar_event
|
|
// ---------------------------------------------------------------------------
|
|
server.registerTool(
|
|
"create_calendar_event",
|
|
{
|
|
description:
|
|
"Create a Google Calendar event. Use immediately after logging a " +
|
|
"recruiter call, company first interview, or company second interview " +
|
|
"to the spreadsheet. One calendar event per scheduling column populated.",
|
|
inputSchema: {
|
|
account: accountSchema,
|
|
title: z
|
|
.string()
|
|
.describe(
|
|
"Event title, e.g. '[Recruiter Call] Acme Corp - Sr Engineer' " +
|
|
"or '[Interview] Acme Corp - Sr Engineer'"
|
|
),
|
|
startDateTime: z
|
|
.string()
|
|
.describe("Event start in ISO 8601 format, e.g. 2026-02-20T14:00:00-06:00"),
|
|
durationMinutes: z
|
|
.number()
|
|
.min(5)
|
|
.max(480)
|
|
.optional()
|
|
.describe("Duration in minutes (default 60)"),
|
|
description: z
|
|
.string()
|
|
.optional()
|
|
.describe(
|
|
"Event description: recruiter/company contact info, notes, " +
|
|
"whether they have your cell number, etc."
|
|
),
|
|
location: z
|
|
.string()
|
|
.optional()
|
|
.describe("Video meeting link (Zoom/Teams URL) or phone number"),
|
|
},
|
|
},
|
|
async ({ account, title, startDateTime, durationMinutes, description, location }) => {
|
|
try {
|
|
const calendar = getCalendarClient(account);
|
|
const calendarId = getCalendarId(account);
|
|
|
|
const start = new Date(startDateTime);
|
|
const end = new Date(start.getTime() + (durationMinutes ?? 60) * 60_000);
|
|
|
|
const event = await calendar.events.insert({
|
|
calendarId,
|
|
requestBody: {
|
|
summary: title,
|
|
start: {
|
|
dateTime: start.toISOString(),
|
|
},
|
|
end: {
|
|
dateTime: end.toISOString(),
|
|
},
|
|
description: description ?? "",
|
|
location: location ?? "",
|
|
},
|
|
});
|
|
|
|
return {
|
|
content: [
|
|
{
|
|
type: "text" as const,
|
|
text:
|
|
`Created calendar event: "${title}"\n` +
|
|
`Start: ${start.toISOString()}\n` +
|
|
`End: ${end.toISOString()}\n` +
|
|
`Event ID: ${event.data.id}\n` +
|
|
`Link: ${event.data.htmlLink}`,
|
|
},
|
|
],
|
|
};
|
|
} catch (error) {
|
|
const errMsg = error instanceof Error ? error.message : String(error);
|
|
return {
|
|
content: [
|
|
{
|
|
type: "text" as const,
|
|
text: `Error creating calendar event: ${errMsg}`,
|
|
},
|
|
],
|
|
};
|
|
}
|
|
}
|
|
);
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Start server
|
|
// ---------------------------------------------------------------------------
|
|
async function main(): Promise<void> {
|
|
const transport = new StdioServerTransport();
|
|
await server.connect(transport);
|
|
console.error("Assistant MCP Server running on stdio");
|
|
}
|
|
|
|
main().catch((error) => {
|
|
console.error("Fatal error in main():", error);
|
|
process.exit(1);
|
|
});
|