feat: support multi-device sign in (#78)

Co-authored-by: Shubham Naik <shub@memgpt.ai>

src/auth/oauth.ts

@@ -66,6 +66,8 @@ export async function pollForToken(
   deviceCode: string,
   interval: number = 5,
   expiresIn: number = 900,
+  deviceId?: string,
+  deviceName?: string,
 ): Promise<TokenResponse> {
   const startTime = Date.now();
   const expiresInMs = expiresIn * 1000;
@@ -84,6 +86,8 @@ export async function pollForToken(
             grant_type: "urn:ietf:params:oauth:grant-type:device_code",
             client_id: OAUTH_CONFIG.clientId,
             device_code: deviceCode,
+            ...(deviceId && { device_id: deviceId }),
+            ...(deviceName && { device_name: deviceName }),
           }),
         },
       );

src/auth/setup-ui.tsx

@@ -3,6 +3,7 @@
  */
 
 import { Box, Text, useApp, useInput } from "ink";
+import { hostname } from "os";
 import { useState } from "react";
 import { asciiLogo } from "../cli/components/AsciiArt.ts";
 import { settingsManager } from "../settings-manager";
@@ -62,11 +63,21 @@ export function SetupUI({ onComplete }: SetupUIProps) {
         console.error("Failed to auto-open browser:", openErr);
       }
 
+      // Get or generate device ID
+      let deviceId = settingsManager.getSetting("deviceId");
+      if (!deviceId) {
+        deviceId = crypto.randomUUID();
+        settingsManager.updateSettings({ deviceId });
+      }
+      const deviceName = hostname();
+
       // Start polling in background
       pollForToken(
         deviceData.device_code,
         deviceData.interval,
         deviceData.expires_in,
+        deviceId,
+        deviceName,
       )
         .then((tokens) => {
           // Save tokens

src/settings-manager.ts

@@ -18,6 +18,7 @@ export interface Settings {
   // OAuth token management
   refreshToken?: string;
   tokenExpiresAt?: number; // Unix timestamp in milliseconds
+  deviceId?: string;
 }
 
 export interface ProjectSettings {