MCPでAIアシスタントに本物のツールを

import { SignJWT, importJWK } from "jose";

// POST https://YOUR-PRODUCT-DOMAIN/api/bmai/identity — requires YOUR OWN logged-in product session.
app.post("/api/bmai/identity", requireSession, async (req, res) => {
  // Fresh on EVERY mint. Never persist the launch token/nonce in localStorage,
  // sessionStorage, cookies, React state, or module state: every assistant
  // launch consumes this pair exactly once.
  const nonce = typeof req.body?.nonce === "string" ? req.body.nonce : "";
  if (!/^[A-Za-z0-9_-]{32,200}$/.test(nonce)) return res.status(400).json({ error: "invalid_nonce" });
  const key = await importJWK(JSON.parse(process.env.AI_LAUNCH_PRIVATE_JWK), "ES256");
  const token = await new SignJWT({
      tenant_id: process.env.BMAI_TENANT_ID, // the tenant id shown in Console → Identity
      nonce,                               // equals the sibling field below
      name: req.user.displayName,          // optional low-sensitivity display claim
    })
    .setProtectedHeader({ alg: "ES256", kid: process.env.AI_LAUNCH_KEY_ID })
    .setIssuer(process.env.BMAI_ISSUER) // the Issuer you registered in Console → Identity
    .setAudience("busymate-ai")
    .setSubject(req.user.id)               // IMMUTABLE internal account id; never email/phone/session id
    .setJti(crypto.randomUUID())           // one-time (replay-protected)
    .setIssuedAt()
    .setExpirationTime("120s")               // <= registered max age (120s)
    .sign(key);
  res.set("Cache-Control", "no-store");
  res.status(201).json({ token, nonce, expiresIn: 120 });
});

<!-- Floating "mate" launcher for Your product.
     Anonymous chat works immediately on the allowed origins. -->
<script>
  function newLaunchNonce() {
    const bytes = new Uint8Array(32);
    crypto.getRandomValues(bytes);
    return btoa(String.fromCharCode(...bytes))
      .replace(/\+/g, "-").replace(/\//g, "_").replace(/=+$/g, "");
  }

  window.BusymateAI = {
    getIdentity: async () => {
      const accessToken = await getProductAccessToken(); // YOUR existing auth helper
      if (!accessToken) return null;
      const nonce = newLaunchNonce();
      const returnTo = new URL(location.href); returnTo.search = ""; returnTo.hash = "";
      const r = await fetch("https://YOUR-PRODUCT-DOMAIN/api/bmai/identity", {
        method: "POST", credentials: "include", cache: "no-store",
        headers: { "content-type": "application/json", authorization: "Bearer " + accessToken },
        body: JSON.stringify({ nonce, returnTo: returnTo.href }),
      });
      if (r.status === 401) return null; // signed out -> anonymous chat
      if (!r.ok) throw new Error("AI identity mint failed (" + r.status + ")");
      // MUST be a newly minted { token, nonce } pair on every call. Never
      // persist either value in localStorage, sessionStorage, cookies, React
      // state, or module state.
      const identity = await r.json();
      if (identity.nonce !== nonce) throw new Error("AI identity nonce mismatch");
      return { token: identity.token, nonce: identity.nonce };
    },
  };

  // Call after YOUR product completes login, an access-token/session
  // rotation, or an account switch — upgrades the live conversation in
  // place, same thread. Do not send an identity postMessage directly.
  window.assistantIdentityChanged = () =>
    window.BusymateAI?.identityChanged?.() ?? Promise.resolve(false);

  // Call after YOUR product completes logout. Without this the signed-out
  // visitor keeps a verified chat and the previous transcript until the tab
  // closes — a privacy defect, not a missing nicety.
  window.assistantSignedOut = () =>
    window.BusymateAI?.signedOut?.("signed_out");
</script>
<script
  src="https://your-assistant.busymate.ai/embed/v1.js"
  data-assistant="your-assistant"
  data-label="Ask mate"
  async></script>

// Full-page open with identity in the URL FRAGMENT — never sent in the
// request line, referrer, or logs; the destination strips it before exchange.
function newLaunchNonce() {
  const bytes = new Uint8Array(32);
  crypto.getRandomValues(bytes);
  return btoa(String.fromCharCode(...bytes))
    .replace(/\+/g, "-").replace(/\//g, "_").replace(/=+$/g, "");
}

const nonce = newLaunchNonce();
const accessToken = await getProductAccessToken(); // YOUR existing auth helper
if (!accessToken) throw new Error("Sign in before opening an identified assistant");
const returnTo = new URL(location.href); returnTo.search = ""; returnTo.hash = "";
const response = await fetch("https://YOUR-PRODUCT-DOMAIN/api/bmai/identity", {
  method: "POST", credentials: "include", cache: "no-store",
  headers: { "content-type": "application/json", authorization: "Bearer " + accessToken },
  body: JSON.stringify({ nonce, returnTo: returnTo.href }),
});
if (response.status === 401) throw new Error("Sign in before opening an identified assistant");
if (!response.ok) throw new Error("AI identity mint failed (" + response.status + ")");
const identity = await response.json();
if (typeof identity.token !== "string" || typeof identity.nonce !== "string") {
  throw new Error("AI identity mint returned an invalid response");
}
if (identity.nonce !== nonce) throw new Error("AI identity nonce mismatch");

const url = new URL("https://your-assistant.busymate.ai/");
url.hash = new URLSearchParams({
  bmai_token: identity.token,
  bmai_nonce: identity.nonce,
}).toString();
location.assign(url);

// Swift Package: https://github.com/serebano/busymate-ai-sdk-ios.git (exact 1.0.2)
// Full lifecycle + demo: https://busymate.ai/docs/guides/ios-sdk
import WebKit
import BusymateAI

@MainActor
func installAssistant(
  on webView: WKWebView,
  account: @escaping () -> String?,
  mint: @escaping @MainActor (BusymateBridge.MintRequest) async throws -> BusymateBridge.MintToken?
) {
  BusymateBridge.install(on: webView, config: .init(
    assistant: "your-assistant",
    origins: ["https://your-assistant.busymate.ai"],
    account: account,
    mint: mint
  ))
  // mint calls YOUR authenticated backend with request.nonce; never cache tokens.
  // Backend endpoint: https://YOUR-PRODUCT-DOMAIN/api/bmai/identity
  webView.load(URLRequest(url: URL(string: "https://your-assistant.busymate.ai/?channel=ios")!))
}
// Microphone: declare NSMicrophoneUsageDescription; install and retain
// BusymateMicrophone before load, and forward WKUIDelegate media permission.
// Call BusymateBridge.accountChanged() on login/logout/account changes.

// Gradle installation + lifecycle: https://busymate.ai/docs/guides/android-sdk
// Source: https://github.com/serebano/busymate-ai-sdk-android/tree/1.0.2
import android.webkit.WebView
import ai.busymate.bridge.BusymateBridge

fun installAssistant(
  webView: WebView,
  account: () -> String?,
  mint: (Map<String, Any?>, (BusymateBridge.MintResult) -> Unit) -> Unit
) {
  BusymateBridge.install(webView, BusymateBridge.Config(
    assistant = "your-assistant",
    origins = listOf("https://your-assistant.busymate.ai"),
    account = account,
    mint = mint
  ))
  // mint calls YOUR authenticated backend with request["nonce"], then done(result).
  // Backend endpoint: https://YOUR-PRODUCT-DOMAIN/api/bmai/identity
  webView.loadUrl("https://your-assistant.busymate.ai/?channel=android")
}
// Microphone: declare INTERNET + RECORD_AUDIO; construct and retain
// BusymateMicrophone in Activity.onCreate BEFORE STARTED/loadUrl; forward
// WebChromeClient.onPermissionRequest. See the guide for renderer recovery.
// Call BusymateBridge.accountChanged() on login/logout/account changes.

// Official desktop SDK for your platform — macOS, Windows, Electron, Linux or Tauri:
// https://github.com/serebano/busymate-ai-sdk-electron (and -macos, -windows, -linux, -tauri).
// Every SDK takes these settings and installs the identity bridge before the first load.
const chatOptions = {
  url: "https://your-assistant.busymate.ai/?channel=desktop_sdk", // the window's top-level page
  assistant: "your-assistant",
  account: () => productAuth.currentUserId(), // null when signed out
  // YOUR authenticated backend signs { token, nonce } for request.nonce.
  mint: (request) => productAuth.mintAssistantIdentity(request),
};