feat(ai): add device code login callback and use for copilot

packages/ai/CHANGELOG.md

@@ -7,6 +7,10 @@
 - Changed source syntax to avoid TypeScript constructs that require JavaScript emit, keeping the package compatible with Node.js strip-only TypeScript checks.
 - Removed the package-level development watch scripts now that the root TypeScript check validates strip-only-compatible sources.
 
+### Added
+
+- Added first-class OAuth device-code callback metadata, shared polling support, and GitHub Copilot OAuth integration.
+
 ### Fixed
 
 - Fixed OpenAI-compatible `streamSimple()` requests to stop sending model-derived default output token caps, avoiding context-window reservation failures on servers such as vLLM while preserving explicit `maxTokens` and required Anthropic `max_tokens` handling ([#4675](https://github.com/earendil-works/pi/issues/4675)).

packages/ai/src/cli.ts

@@ -42,6 +42,11 @@ async function login(providerId: OAuthProviderId): Promise<void> {
 				if (info.instructions) console.log(info.instructions);
 				console.log();
 			},
+			onDeviceCode: (info) => {
+				console.log(`\nOpen this URL in your browser:\n${info.verificationUri}`);
+				console.log(`Enter code: ${info.userCode}`);
+				console.log();
+			},
 			onPrompt: async (p) => {
 				return await promptFn(`${p.message}${p.placeholder ? ` (${p.placeholder})` : ""}:`);
 			},

packages/ai/src/index.ts

@@ -32,6 +32,7 @@ export * from "./utils/json-parse.ts";
 export type {
 	OAuthAuthInfo,
 	OAuthCredentials,
+	OAuthDeviceCodeInfo,
 	OAuthLoginCallbacks,
 	OAuthPrompt,
 	OAuthProvider,

packages/ai/src/utils/oauth/device-code.ts

@@ -0,0 +1,80 @@
+const CANCEL_MESSAGE = "Login cancelled";
+const TIMEOUT_MESSAGE = "Device flow timed out";
+const SLOW_DOWN_TIMEOUT_MESSAGE =
+	"Device flow timed out after one or more slow_down responses. This is often caused by clock drift in WSL or VM environments. Please sync or restart the VM clock and try again.";
+const MINIMUM_INTERVAL_MS = 1000;
+// RFC 8628 section 3.2: if the authorization server omits `interval`, the client must use 5 seconds.
+const DEFAULT_POLL_INTERVAL_SECONDS = 5;
+// RFC 8628 section 3.5: `slow_down` means the polling interval must increase by 5 seconds.
+const SLOW_DOWN_INTERVAL_INCREMENT_MS = 5000;
+
+export type OAuthDeviceCodePollResult =
+	| { status: "pending" }
+	| { status: "slow_down" }
+	| { status: "complete"; accessToken: string }
+	| { status: "failed"; message: string };
+
+export type OAuthDeviceCodePollOptions = {
+	intervalSeconds?: number;
+	expiresInSeconds?: number;
+	poll: () => Promise<OAuthDeviceCodePollResult>;
+	signal?: AbortSignal;
+};
+
+function abortableSleep(ms: number, signal: AbortSignal | undefined, cancelMessage: string): Promise<void> {
+	return new Promise((resolve, reject) => {
+		if (signal?.aborted) {
+			reject(new Error(cancelMessage));
+			return;
+		}
+
+		const onAbort = () => {
+			clearTimeout(timeout);
+			reject(new Error(cancelMessage));
+		};
+		const timeout = setTimeout(() => {
+			signal?.removeEventListener("abort", onAbort);
+			resolve();
+		}, ms);
+
+		signal?.addEventListener("abort", onAbort, { once: true });
+	});
+}
+
+export async function pollOAuthDeviceCodeFlow(options: OAuthDeviceCodePollOptions): Promise<string> {
+	const deadline =
+		typeof options.expiresInSeconds === "number"
+			? Date.now() + options.expiresInSeconds * 1000
+			: Number.POSITIVE_INFINITY;
+	let intervalMs = Math.max(
+		MINIMUM_INTERVAL_MS,
+		Math.floor((options.intervalSeconds ?? DEFAULT_POLL_INTERVAL_SECONDS) * 1000),
+	);
+
+	let slowDownResponses = 0;
+	while (Date.now() < deadline) {
+		if (options.signal?.aborted) {
+			throw new Error(CANCEL_MESSAGE);
+		}
+
+		const remainingMs = deadline - Date.now();
+		await abortableSleep(Math.min(intervalMs, remainingMs), options.signal, CANCEL_MESSAGE);
+
+		const result = await options.poll();
+		if (result.status === "complete") {
+			return result.accessToken;
+		}
+		if (result.status === "pending") {
+			continue;
+		}
+		if (result.status === "slow_down") {
+			slowDownResponses += 1;
+			// RFC 8628 section 3.5: apply this increase to this and all subsequent requests.
+			intervalMs = Math.max(MINIMUM_INTERVAL_MS, intervalMs + SLOW_DOWN_INTERVAL_INCREMENT_MS);
+			continue;
+		}
+		throw new Error(result.message);
+	}
+
+	throw new Error(slowDownResponses > 0 ? SLOW_DOWN_TIMEOUT_MESSAGE : TIMEOUT_MESSAGE);
+}

packages/ai/src/utils/oauth/github-copilot.ts

@@ -4,7 +4,8 @@
 
 import { getModels } from "../../models.ts";
 import type { Api, Model } from "../../types.ts";
-import type { OAuthCredentials, OAuthLoginCallbacks, OAuthProviderInterface } from "./types.ts";
+import { pollOAuthDeviceCodeFlow } from "./device-code.ts";
+import type { OAuthCredentials, OAuthDeviceCodeInfo, OAuthLoginCallbacks, OAuthProviderInterface } from "./types.ts";
 
 type CopilotCredentials = OAuthCredentials & {
 	enterpriseUrl?: string;
@@ -20,14 +21,11 @@ const COPILOT_HEADERS = {
 	"Copilot-Integration-Id": "vscode-chat",
 } as const;
 
-const INITIAL_POLL_INTERVAL_MULTIPLIER = 1.2;
-const SLOW_DOWN_POLL_INTERVAL_MULTIPLIER = 1.4;
-
 type DeviceCodeResponse = {
 	device_code: string;
 	user_code: string;
 	verification_uri: string;
-	interval: number;
+	interval?: number;
 	expires_in: number;
 };
 
@@ -40,7 +38,6 @@ type DeviceTokenSuccessResponse = {
 type DeviceTokenErrorResponse = {
 	error: string;
 	error_description?: string;
-	interval?: number;
 };
 
 export function normalizeDomain(input: string): string | null {
@@ -129,7 +126,7 @@ async function startDeviceFlow(domain: string): Promise<DeviceCodeResponse> {
 		typeof deviceCode !== "string" ||
 		typeof userCode !== "string" ||
 		typeof verificationUri !== "string" ||
-		typeof interval !== "number" ||
+		(interval !== undefined && typeof interval !== "number") ||
 		typeof expiresIn !== "number"
 	) {
 		throw new Error("Invalid device code response fields");
@@ -144,95 +141,48 @@ async function startDeviceFlow(domain: string): Promise<DeviceCodeResponse> {
 	};
 }
 
-/**
- * Sleep that can be interrupted by an AbortSignal
- */
-function abortableSleep(ms: number, signal?: AbortSignal): Promise<void> {
-	return new Promise((resolve, reject) => {
-		if (signal?.aborted) {
-			reject(new Error("Login cancelled"));
-			return;
-		}
-
-		const timeout = setTimeout(resolve, ms);
-
-		signal?.addEventListener(
-			"abort",
-			() => {
-				clearTimeout(timeout);
-				reject(new Error("Login cancelled"));
-			},
-			{ once: true },
-		);
-	});
-}
-
-async function pollForGitHubAccessToken(
-	domain: string,
-	deviceCode: string,
-	intervalSeconds: number,
-	expiresIn: number,
-	signal?: AbortSignal,
-) {
+async function pollForGitHubAccessToken(domain: string, device: DeviceCodeResponse, signal?: AbortSignal) {
 	const urls = getUrls(domain);
-	const deadline = Date.now() + expiresIn * 1000;
-	let intervalMs = Math.max(1000, Math.floor(intervalSeconds * 1000));
-	let intervalMultiplier = INITIAL_POLL_INTERVAL_MULTIPLIER;
-	let slowDownResponses = 0;
+	return pollOAuthDeviceCodeFlow({
+		intervalSeconds: device.interval,
+		expiresInSeconds: device.expires_in,
+		signal,
+		poll: async () => {
+			const raw = await fetchJson(urls.accessTokenUrl, {
+				method: "POST",
+				headers: {
+					Accept: "application/json",
+					"Content-Type": "application/x-www-form-urlencoded",
+					"User-Agent": "GitHubCopilotChat/0.35.0",
+				},
+				body: new URLSearchParams({
+					client_id: CLIENT_ID,
+					device_code: device.device_code,
+					grant_type: "urn:ietf:params:oauth:grant-type:device_code",
+				}),
+			});
 
-	while (Date.now() < deadline) {
-		if (signal?.aborted) {
-			throw new Error("Login cancelled");
-		}
-
-		const remainingMs = deadline - Date.now();
-		const waitMs = Math.min(Math.ceil(intervalMs * intervalMultiplier), remainingMs);
-		await abortableSleep(waitMs, signal);
-
-		const raw = await fetchJson(urls.accessTokenUrl, {
-			method: "POST",
-			headers: {
-				Accept: "application/json",
-				"Content-Type": "application/x-www-form-urlencoded",
-				"User-Agent": "GitHubCopilotChat/0.35.0",
-			},
-			body: new URLSearchParams({
-				client_id: CLIENT_ID,
-				device_code: deviceCode,
-				grant_type: "urn:ietf:params:oauth:grant-type:device_code",
-			}),
-		});
-
-		if (raw && typeof raw === "object" && typeof (raw as DeviceTokenSuccessResponse).access_token === "string") {
-			return (raw as DeviceTokenSuccessResponse).access_token;
-		}
-
-		if (raw && typeof raw === "object" && typeof (raw as DeviceTokenErrorResponse).error === "string") {
-			const { error, error_description: description, interval } = raw as DeviceTokenErrorResponse;
-			if (error === "authorization_pending") {
-				continue;
+			if (raw && typeof raw === "object" && typeof (raw as DeviceTokenSuccessResponse).access_token === "string") {
+				return { status: "complete", accessToken: (raw as DeviceTokenSuccessResponse).access_token };
 			}
 
-			if (error === "slow_down") {
-				slowDownResponses += 1;
-				intervalMs =
-					typeof interval === "number" && interval > 0 ? interval * 1000 : Math.max(1000, intervalMs + 5000);
-				intervalMultiplier = SLOW_DOWN_POLL_INTERVAL_MULTIPLIER;
-				continue;
+			if (raw && typeof raw === "object" && typeof (raw as DeviceTokenErrorResponse).error === "string") {
+				const { error, error_description: description } = raw as DeviceTokenErrorResponse;
+				if (error === "authorization_pending") {
+					return { status: "pending" };
+				}
+
+				if (error === "slow_down") {
+					return { status: "slow_down" };
+				}
+
+				const descriptionSuffix = description ? `: ${description}` : "";
+				return { status: "failed", message: `Device flow failed: ${error}${descriptionSuffix}` };
 			}
 
-			const descriptionSuffix = description ? `: ${description}` : "";
-			throw new Error(`Device flow failed: ${error}${descriptionSuffix}`);
-		}
-	}
-
-	if (slowDownResponses > 0) {
-		throw new Error(
-			"Device flow timed out after one or more slow_down responses. This is often caused by clock drift in WSL or VM environments. Please sync or restart the VM clock and try again.",
-		);
-	}
-
-	throw new Error("Device flow timed out");
+			return { status: "failed", message: "Invalid device token response" };
+		},
+	});
 }
 
 /**
@@ -319,13 +269,13 @@ async function enableAllGitHubCopilotModels(
 /**
  * Login with GitHub Copilot OAuth (device code flow)
  *
- * @param options.onAuth - Callback with URL and optional instructions (user code)
+ * @param options.onDeviceCode - Callback with URL and user code
  * @param options.onPrompt - Callback to prompt user for input
  * @param options.onProgress - Optional progress callback
  * @param options.signal - Optional AbortSignal for cancellation
  */
 export async function loginGitHubCopilot(options: {
-	onAuth: (url: string, instructions?: string) => void;
+	onDeviceCode: (info: OAuthDeviceCodeInfo) => void;
 	onPrompt: (prompt: { message: string; placeholder?: string; allowEmpty?: boolean }) => Promise<string>;
 	onProgress?: (message: string) => void;
 	signal?: AbortSignal;
@@ -348,15 +298,14 @@ export async function loginGitHubCopilot(options: {
 	const domain = enterpriseDomain || "github.com";
 
 	const device = await startDeviceFlow(domain);
-	options.onAuth(device.verification_uri, `Enter code: ${device.user_code}`);
+	options.onDeviceCode({
+		userCode: device.user_code,
+		verificationUri: device.verification_uri,
+		intervalSeconds: device.interval,
+		expiresInSeconds: device.expires_in,
+	});
 
-	const githubAccessToken = await pollForGitHubAccessToken(
-		domain,
-		device.device_code,
-		device.interval,
-		device.expires_in,
-		options.signal,
-	);
+	const githubAccessToken = await pollForGitHubAccessToken(domain, device, options.signal);
 	const credentials = await refreshGitHubCopilotToken(githubAccessToken, enterpriseDomain ?? undefined);
 
 	// Enable all models after successful login
@@ -370,8 +319,12 @@ export const githubCopilotOAuthProvider: OAuthProviderInterface = {
 	name: "GitHub Copilot",
 
 	async login(callbacks: OAuthLoginCallbacks): Promise<OAuthCredentials> {
+		if (!callbacks.onDeviceCode) {
+			throw new Error("GitHub Copilot OAuth requires a device code callback");
+		}
+
 		return loginGitHubCopilot({
-			onAuth: (url, instructions) => callbacks.onAuth({ url, instructions }),
+			onDeviceCode: callbacks.onDeviceCode,
 			onPrompt: callbacks.onPrompt,
 			onProgress: callbacks.onProgress,
 			signal: callbacks.signal,

packages/ai/src/utils/oauth/index.ts

@@ -9,6 +9,7 @@
 
 // Anthropic
 export { anthropicOAuthProvider, loginAnthropic, refreshAnthropicToken } from "./anthropic.ts";
+export * from "./device-code.ts";
 // GitHub Copilot
 export {
 	getGitHubCopilotBaseUrl,

packages/ai/src/utils/oauth/types.ts

@@ -23,6 +23,13 @@ export type OAuthAuthInfo = {
 	instructions?: string;
 };
 
+export type OAuthDeviceCodeInfo = {
+	userCode: string;
+	verificationUri: string;
+	intervalSeconds?: number;
+	expiresInSeconds?: number;
+};
+
 export type OAuthSelectOption = {
 	id: string;
 	label: string;
@@ -35,6 +42,7 @@ export type OAuthSelectPrompt = {
 
 export interface OAuthLoginCallbacks {
 	onAuth: (info: OAuthAuthInfo) => void;
+	onDeviceCode?: (info: OAuthDeviceCodeInfo) => void;
 	onPrompt: (prompt: OAuthPrompt) => Promise<string>;
 	onProgress?: (message: string) => void;
 	onManualCodeInput?: () => Promise<string>;

packages/ai/test/github-copilot-oauth.test.ts

@@ -29,7 +29,62 @@ describe("GitHub Copilot OAuth device flow", () => {
 		vi.useRealTimers();
 	});
 
-	it("waits before the first poll and increases the safety margin after slow_down", async () => {
+	it("reports device-code details through onDeviceCode", async () => {
+		vi.useFakeTimers();
+		vi.setSystemTime(new Date("2026-03-09T00:00:00Z"));
+
+		const fetchMock = vi.fn(async (input: unknown): Promise<Response> => {
+			const url = getUrl(input);
+
+			if (url.endsWith("/login/device/code")) {
+				return jsonResponse({
+					device_code: "device-code",
+					user_code: "ABCD-EFGH",
+					verification_uri: "https://github.com/login/device",
+					interval: 1,
+					expires_in: 900,
+				});
+			}
+
+			if (url.endsWith("/login/oauth/access_token")) {
+				return jsonResponse({ access_token: "ghu_refresh_token" });
+			}
+
+			if (url.includes("/copilot_internal/v2/token")) {
+				return jsonResponse({
+					token: "tid=test;exp=9999999999;proxy-ep=proxy.individual.githubcopilot.com;",
+					expires_at: 9999999999,
+				});
+			}
+
+			if (url.includes("/models/") && url.endsWith("/policy")) {
+				return new Response("", { status: 200 });
+			}
+
+			throw new Error(`Unexpected fetch URL: ${url}`);
+		});
+
+		vi.stubGlobal("fetch", fetchMock);
+
+		const onDeviceCode = vi.fn();
+		const loginPromise = loginGitHubCopilot({
+			onDeviceCode,
+			onPrompt: async () => "",
+		});
+
+		await vi.advanceTimersByTimeAsync(0);
+
+		expect(onDeviceCode).toHaveBeenCalledWith({
+			userCode: "ABCD-EFGH",
+			verificationUri: "https://github.com/login/device",
+			intervalSeconds: 1,
+			expiresInSeconds: 900,
+		});
+		await vi.advanceTimersByTimeAsync(1000);
+		await loginPromise;
+	});
+
+	it("waits before the first poll and increases the interval after slow_down", async () => {
 		vi.useFakeTimers();
 		const startTime = new Date("2026-03-09T00:00:00Z");
 		vi.setSystemTime(startTime);
@@ -37,7 +92,7 @@ describe("GitHub Copilot OAuth device flow", () => {
 		const accessTokenPollTimes: number[] = [];
 		const accessTokenResponses = [
 			jsonResponse({ error: "authorization_pending", error_description: "pending" }),
-			jsonResponse({ error: "slow_down", error_description: "slow down", interval: 10 }),
+			jsonResponse({ error: "slow_down", error_description: "slow down" }),
 			jsonResponse({ access_token: "ghu_refresh_token" }),
 		];
 
@@ -95,7 +150,7 @@ describe("GitHub Copilot OAuth device flow", () => {
 		vi.stubGlobal("fetch", fetchMock);
 
 		const loginPromise = loginGitHubCopilot({
-			onAuth: () => {},
+			onDeviceCode: () => {},
 			onPrompt: async () => "",
 			onProgress: () => {},
 		});
@@ -103,28 +158,28 @@ describe("GitHub Copilot OAuth device flow", () => {
 		await vi.advanceTimersByTimeAsync(0);
 		expect(accessTokenPollTimes).toHaveLength(0);
 
-		await vi.advanceTimersByTimeAsync(5999);
+		await vi.advanceTimersByTimeAsync(4999);
 		expect(accessTokenPollTimes).toHaveLength(0);
 
 		await vi.advanceTimersByTimeAsync(1);
 		expect(accessTokenPollTimes).toHaveLength(1);
 
-		await vi.advanceTimersByTimeAsync(5999);
+		await vi.advanceTimersByTimeAsync(4999);
 		expect(accessTokenPollTimes).toHaveLength(1);
 
 		await vi.advanceTimersByTimeAsync(1);
 		expect(accessTokenPollTimes).toHaveLength(2);
 
-		await vi.advanceTimersByTimeAsync(13999);
+		await vi.advanceTimersByTimeAsync(9999);
 		expect(accessTokenPollTimes).toHaveLength(2);
 
 		await vi.advanceTimersByTimeAsync(1);
 		await loginPromise;
 
 		expect(accessTokenPollTimes).toEqual([
-			startTime.getTime() + 6000,
-			startTime.getTime() + 12000,
-			startTime.getTime() + 26000,
+			startTime.getTime() + 5000,
+			startTime.getTime() + 10000,
+			startTime.getTime() + 20000,
 		]);
 	});
 
@@ -135,8 +190,8 @@ describe("GitHub Copilot OAuth device flow", () => {
 
 		const accessTokenPollTimes: number[] = [];
 		const accessTokenResponses = [
-			jsonResponse({ error: "slow_down", error_description: "slow down", interval: 10 }),
-			jsonResponse({ error: "slow_down", error_description: "still too fast", interval: 15 }),
+			jsonResponse({ error: "slow_down", error_description: "slow down" }),
+			jsonResponse({ error: "slow_down", error_description: "still too fast" }),
 			jsonResponse({ error: "authorization_pending", error_description: "pending" }),
 		];
 
@@ -168,28 +223,28 @@ describe("GitHub Copilot OAuth device flow", () => {
 		vi.stubGlobal("fetch", fetchMock);
 
 		const loginPromise = loginGitHubCopilot({
-			onAuth: () => {},
+			onDeviceCode: () => {},
 			onPrompt: async () => "",
 		});
 		const rejection = expect(loginPromise).rejects.toThrow(
 			/Device flow timed out after one or more slow_down responses/,
 		);
 
-		await vi.advanceTimersByTimeAsync(6000);
-		expect(accessTokenPollTimes).toEqual([startTime.getTime() + 6000]);
+		await vi.advanceTimersByTimeAsync(5000);
+		expect(accessTokenPollTimes).toEqual([startTime.getTime() + 5000]);
 
-		await vi.advanceTimersByTimeAsync(14000);
-		expect(accessTokenPollTimes).toEqual([startTime.getTime() + 6000, startTime.getTime() + 20000]);
+		await vi.advanceTimersByTimeAsync(10000);
+		expect(accessTokenPollTimes).toEqual([startTime.getTime() + 5000, startTime.getTime() + 15000]);
 
-		await vi.advanceTimersByTimeAsync(4999);
-		expect(accessTokenPollTimes).toEqual([startTime.getTime() + 6000, startTime.getTime() + 20000]);
+		await vi.advanceTimersByTimeAsync(9999);
+		expect(accessTokenPollTimes).toEqual([startTime.getTime() + 5000, startTime.getTime() + 15000]);
 
 		await vi.advanceTimersByTimeAsync(1);
 		await rejection;
 
 		expect(accessTokenPollTimes).toEqual([
-			startTime.getTime() + 6000,
-			startTime.getTime() + 20000,
+			startTime.getTime() + 5000,
+			startTime.getTime() + 15000,
 			startTime.getTime() + 25000,
 		]);
 	});

packages/ai/test/oauth-device-code.test.ts

@@ -0,0 +1,55 @@
+import { afterEach, describe, expect, it, vi } from "vitest";
+import { pollOAuthDeviceCodeFlow } from "../src/utils/oauth/device-code.js";
+
+describe("OAuth device-code polling", () => {
+	afterEach(() => {
+		vi.useRealTimers();
+	});
+
+	it("waits before the first poll and returns the completed value", async () => {
+		vi.useFakeTimers();
+		vi.setSystemTime(new Date("2026-03-09T00:00:00Z"));
+
+		const pollTimes: number[] = [];
+		const poll = vi.fn(async () => {
+			pollTimes.push(Date.now());
+			return pollTimes.length === 1
+				? { status: "pending" as const }
+				: { status: "complete" as const, accessToken: "token" };
+		});
+
+		const resultPromise = pollOAuthDeviceCodeFlow({
+			intervalSeconds: 2,
+			expiresInSeconds: 30,
+			poll,
+		});
+
+		await vi.advanceTimersByTimeAsync(1999);
+		expect(pollTimes).toEqual([]);
+
+		await vi.advanceTimersByTimeAsync(1);
+		expect(pollTimes).toEqual([new Date("2026-03-09T00:00:02Z").getTime()]);
+
+		await vi.advanceTimersByTimeAsync(2000);
+		await expect(resultPromise).resolves.toBe("token");
+		expect(pollTimes).toEqual([
+			new Date("2026-03-09T00:00:02Z").getTime(),
+			new Date("2026-03-09T00:00:04Z").getTime(),
+		]);
+	});
+
+	it("cancels an in-flight wait", async () => {
+		vi.useFakeTimers();
+		const controller = new AbortController();
+
+		const resultPromise = pollOAuthDeviceCodeFlow({
+			intervalSeconds: 5,
+			expiresInSeconds: 30,
+			poll: async () => ({ status: "pending" }),
+			signal: controller.signal,
+		});
+
+		controller.abort();
+		await expect(resultPromise).rejects.toThrow("Login cancelled");
+	});
+});

packages/coding-agent/src/modes/interactive/components/login-dialog.ts

@@ -1,4 +1,4 @@
-import { getOAuthProviders } from "@earendil-works/pi-ai/oauth";
+import { getOAuthProviders, type OAuthDeviceCodeInfo } from "@earendil-works/pi-ai/oauth";
 import { Container, type Focusable, getKeybindings, Input, Spacer, Text, type TUI } from "@earendil-works/pi-tui";
 import { exec } from "child_process";
 import { theme } from "../theme/theme.ts";
@@ -86,7 +86,7 @@ export class LoginDialogComponent extends Container implements Focusable {
 	/**
 	 * Called by onAuth callback - show URL and optional instructions
 	 */
-	showAuth(url: string, instructions?: string): void {
+	showAuth(url: string, instructions?: string, options: { autoOpenBrowser?: boolean } = {}): void {
 		this.contentContainer.clear();
 		this.contentContainer.addChild(new Spacer(1));
 		const linkedUrl = `\x1b]8;;${url}\x07${url}\x1b]8;;\x07`;
@@ -101,11 +101,34 @@ export class LoginDialogComponent extends Container implements Focusable {
 			this.contentContainer.addChild(new Text(theme.fg("warning", instructions), 1, 0));
 		}
 
-		// Try to open browser
+		if (options.autoOpenBrowser ?? true) {
+			this.openUrl(url);
+		}
+		this.tui.requestRender();
+	}
+
+	/**
+	 * Called by onDeviceCode callback - show URL and user code.
+	 */
+	showDeviceCode(info: OAuthDeviceCodeInfo): void {
+		this.contentContainer.clear();
+		this.contentContainer.addChild(new Spacer(1));
+		const linkedUrl = `\x1b]8;;${info.verificationUri}\x07${info.verificationUri}\x1b]8;;\x07`;
+		this.contentContainer.addChild(new Text(theme.fg("accent", linkedUrl), 1, 0));
+
+		const clickHint = process.platform === "darwin" ? "Cmd+click to open" : "Ctrl+click to open";
+		const hyperlink = `\x1b]8;;${info.verificationUri}\x07${clickHint}\x1b]8;;\x07`;
+		this.contentContainer.addChild(new Text(theme.fg("dim", hyperlink), 1, 0));
+		this.contentContainer.addChild(new Spacer(1));
+		this.contentContainer.addChild(new Text(theme.fg("warning", `Enter code: ${info.userCode}`), 1, 0));
+
+		// Do not open device-code URLs automatically. These flows need to work in headless environments.
+		this.tui.requestRender();
+	}
+
+	private openUrl(url: string): void {
 		const openCmd = process.platform === "darwin" ? "open" : process.platform === "win32" ? "start" : "xdg-open";
 		exec(`${openCmd} "${url}"`);
-
-		this.tui.requestRender();
 	}
 
 	/**

packages/coding-agent/src/modes/interactive/interactive-mode.ts

@@ -4815,13 +4815,15 @@ export class InteractiveMode {
 									manualCodeReject = undefined;
 								}
 							});
-					} else if (providerId === "github-copilot") {
-						// GitHub Copilot polls after onAuth
-						dialog.showWaiting("Waiting for browser authentication...");
 					}
 					// For Anthropic: onPrompt is called immediately after
 				},
 
+				onDeviceCode: (info) => {
+					dialog.showDeviceCode(info);
+					dialog.showWaiting("Waiting for authentication...");
+				},
+
 				onPrompt: async (prompt: { message: string; placeholder?: string }) => {
 					return dialog.showPrompt(prompt.message, prompt.placeholder);
 				},