import {
	mkdirSync,
	mkdtempSync,
	readdirSync,
	readFileSync,
	rmSync,
	writeFileSync,
} from "node:fs";
import { tmpdir } from "node:os";
import { dirname, join, resolve } from "node:path";
import { fileURLToPath } from "node:url";
import {
	type Context,
	fauxAssistantMessage,
	fauxToolCall,
	type JsonObject,
} from "@earendil-works/pi-ai";
import {
	DefaultPackageManager,
	type ExtensionCommandContext,
	type ExtensionContext,
	type ExtensionToolContext,
	initTheme,
	SessionManager,
	type Theme,
} from "@earendil-works/pi-coding-agent";
import { afterEach, describe, expect, it, vi } from "vitest";
import {
	createPiSession,
	type PiSession,
} from "../../../test/fixture/create-pi-session.ts";
import { resolveSubagentExtensions } from "../implementation.ts";
import ultraExtension from "../index.ts";
import {
	DEFAULT_MODEL_TIERS,
	modelTierPrompt,
	parseUltraSettings,
} from "../settings.ts";
import { WorkflowSpecSchema } from "../spec.ts";

let session: PiSession | undefined;
let cwd: string | undefined;
let notifySpy: ReturnType<typeof vi.spyOn> | undefined;

afterEach(async () => {
	await session?.dispose();
	if (cwd) rmSync(cwd, { recursive: true, force: true });
	session = undefined;
	cwd = undefined;
	notifySpy = undefined;
	vi.unstubAllEnvs();
	vi.restoreAllMocks();
});

function ultraPath(): string {
	return fileURLToPath(new URL("../index.ts", import.meta.url));
}

function createToolContext(
	overrides: Partial<ExtensionContext> = {},
	toolCallId = "call",
): ExtensionToolContext {
	if (!session) throw new Error("missing session");
	const context = Object.create(
		session.session.extensionRunner.createToolContext(toolCallId, undefined),
	) as ExtensionToolContext;
	if (overrides.ui)
		Object.defineProperty(context, "ui", { value: overrides.ui });
	if (overrides.sessionManager)
		Object.defineProperty(context, "sessionManager", {
			value: overrides.sessionManager,
		});
	return context;
}

// The owned fixture binds in print mode with a no-op UI context. Replace it with
// a recording UI (hasUI becomes true, so overlay-driven surfaces run) and spy on
// notify to capture the UI's notify calls.
function installUi(): void {
	if (!session) throw new Error("missing session");
	const runner = session.session.extensionRunner;
	const ui = { ...runner.getUIContext() };
	notifySpy = vi.spyOn(ui, "notify");
	runner.setUIContext(ui, "print");
}

function uiCallsFor(method: "notify"): Array<{ args: unknown[] }> {
	if (method !== "notify") return [];
	return (notifySpy?.mock.calls ?? []).map((args: unknown[]) => ({ args }));
}

async function start(
	options: {
		settings?: Record<string, unknown> | null;
		env?: Record<string, string | undefined>;
		factory?: boolean;
		extra?: string[];
	} = {},
) {
	cwd = mkdtempSync(join(tmpdir(), "ultra-contract-"));
	if (options.settings !== null) {
		mkdirSync(join(cwd, ".pi"), { recursive: true });
		writeFileSync(
			join(cwd, ".pi", "settings.json"),
			JSON.stringify(options.settings ?? { ultra: { autoEnable: false } }),
		);
	}
	session = await createPiSession({
		cwd,
		...(options.env ? { env: options.env } : {}),
		...(options.factory
			? { extensionFactories: [ultraExtension] }
			: { extensionPaths: [ultraPath(), ...(options.extra ?? [])] }),
	});
	installUi();
	return session.extensions[0]!;
}

function saveWorkflow(name: string, dynamicExtension?: string): void {
	if (!session) throw new Error("missing session");
	const directory = join(session.cwd, ".pi", "workflows");
	mkdirSync(directory, { recursive: true });
	writeFileSync(
		join(directory, `${name}.json`),
		`${JSON.stringify({
			name,
			phases: [
				{
					id: "work",
					kind: "single",
					step: {
						summary: "Work",
						prompt: "Work",
						...(dynamicExtension
							? { dynamicExtensions: [dynamicExtension] }
							: {}),
					},
				},
			],
		})}\n`,
	);
}

function driveOverlay(
	ctx: ExtensionCommandContext,
	interact?: (overlay: { handleInput(data: string): void }) => void,
): void {
	Object.assign(ctx.ui, {
		custom: vi.fn(
			async (
				factory: (
					host: unknown,
					theme: unknown,
					keybindings: unknown,
					done: (value: unknown) => void,
				) => { handleInput(data: string): void },
			) =>
				new Promise((resolve) => {
					const overlay = factory(
						{ requestRender: vi.fn() },
						{},
						{ matches: () => false },
						resolve,
					);
					interact?.(overlay);
				}),
		),
	});
}

describe("ultra extension", () => {
	it("resolves explicit Pi sources through the SDK without installing them", async () => {
		const resolveSources = vi
			.spyOn(DefaultPackageManager.prototype, "resolveExtensionSources")
			.mockResolvedValue({
				extensions: [
					{ path: "/enabled/index.ts", enabled: true },
					{ path: "/disabled/index.ts", enabled: false },
				],
			} as never);
		const selection = await resolveSubagentExtensions(
			parseUltraSettings({
				subagentExtensions: [
					"npm:@scope/pi-extension",
					"https://github.com/example/pi-extension.git",
				],
			}).subagentExtensions,
			{
				cwd: process.cwd(),
				agentDir: join(process.cwd(), ".agent"),
				projectTrusted: false,
			},
		);
		expect(resolveSources).toHaveBeenNthCalledWith(
			1,
			["npm:@scope/pi-extension"],
			{ temporary: true },
		);
		expect(resolveSources).toHaveBeenNthCalledWith(
			2,
			["https://github.com/example/pi-extension.git"],
			{ temporary: true },
		);
		expect(selection.paths).toEqual(["/enabled/index.ts"]);
		const path = resolve("/enabled/index.ts").replaceAll("\\", "/");
		expect(selection.pathKeys).toEqual(
			new Set([process.platform === "win32" ? path.toLowerCase() : path]),
		);
	});

	it("resolves relative sources from cwd regardless of project trust", async () => {
		cwd = mkdtempSync(join(tmpdir(), "ultra-relative-source-"));
		mkdirSync(join(cwd, "research"));
		const entry = join(cwd, "research", "evidence.ts");
		writeFileSync(entry, "export default function () {}");
		writeFileSync(
			join(cwd, "research", "package.json"),
			JSON.stringify({ pi: { extensions: ["evidence.ts"] } }),
		);
		for (const projectTrusted of [false, true]) {
			const options = {
				cwd,
				agentDir: join(cwd, "unrelated-agent"),
				projectTrusted,
			};
			expect(
				(await resolveSubagentExtensions(["./research"], options)).paths,
			).toEqual([entry]);
			expect(
				(await resolveSubagentExtensions(["research"], options)).paths,
			).toEqual([entry]);
			await expect(
				resolveSubagentExtensions(["./research", "./missing.ts"], options),
			).rejects.toThrow("no enabled extensions resolved");
		}
	});

	it("rejects legacy bare extension nicknames with migration guidance", async () => {
		await expect(
			resolveSubagentExtensions(["nushell"], {
				cwd: process.cwd(),
				agentDir: join(process.cwd(), ".agent"),
				projectTrusted: true,
			}),
		).rejects.toThrow(/no longer accepts bare extension nickname/u);
	});

	it("loads only the command and renderer in the real Pi runtime", async () => {
		const indexPath = ultraPath();
		const extension = await start();
		expect(extension.path).toBe(indexPath);
		expect(extension.tools.has("run_workflow")).toBe(false);
		expect(readFileSync(indexPath, "utf8")).toContain(
			'import("./implementation.ts")',
		);
		expect(extension.commands.has("ultra")).toBe(true);
		expect(extension.commands.has("ultra-runs")).toBe(false);
	});

	it("writes disabled command outcome in its debug sandbox", async () => {
		const extension = await start({
			settings: null,
			env: { PI_ULTRA_DEBUG: "1" },
		});
		const runner = session?.session.extensionRunner;
		if (!runner || !session) throw new Error("missing session");
		const context = runner.createCommandContext();
		mkdirSync(join(session.cwd, ".pi"), { recursive: true });
		writeFileSync(
			join(session.cwd, ".pi", "settings.json"),
			JSON.stringify({ ultra: { enabled: false } }),
		);
		await extension.commands.get("ultra")!.handler("", context);
		await runner.emit({ type: "session_shutdown", reason: "quit" });
		const directory = join(
			session.cwd,
			".test-state",
			"pi-ext",
			"debug",
			"ultra",
		);
		const records = readFileSync(
			join(directory, readdirSync(directory)[0]!),
			"utf8",
		)
			.trim()
			.split("\n")
			.map((line) => JSON.parse(line));
		expect(
			records.filter((record) => record.event === "command.handle.start"),
		).toHaveLength(1);
		expect(
			records.filter((record) => record.event === "command.handle.finish"),
		).toEqual([expect.objectContaining({ outcome: "disabled" })]);
		expect(records.map((record) => record.event)).toEqual(
			expect.arrayContaining(["session.start", "session.shutdown"]),
		);
	});

	it("auto-enables the workflow tool when configured", async () => {
		const extension = await start({
			settings: { ultra: { autoEnable: true } },
		});
		if (!session) throw new Error("missing session");

		expect(extension.tools.has("run_workflow")).toBe(true);
		expect(session.session.getActiveToolNames()).toContain("run_workflow");
		expect(session.session.systemPrompt).toContain("- run_workflow:");
	});

	it.each([false, true])(
		"registers the authoring skill independently of tool activation (auto-enable: %s)",
		async (autoEnable) => {
			const extension = await start({ settings: { ultra: { autoEnable } } });
			if (!session) throw new Error("missing session");
			const skillPath = fileURLToPath(
				new URL("../prompts/ultra-authoring/SKILL.md", import.meta.url),
			);
			const skill = session.session.resourceLoader
				.getSkills()
				.skills.find((candidate) => candidate.name === "ultra-authoring");
			expect(skill?.filePath).toBe(skillPath);
			expect(session.session.systemPrompt).toContain(skillPath);
			expect(session.session.systemPrompt).not.toContain(
				readFileSync(skillPath, "utf8").trim(),
			);
			expect(session.session.systemPrompt).not.toContain("## Worked example");

			if (!autoEnable) {
				await extension.commands
					.get("ultra")!
					.handler("", session.session.extensionRunner.createCommandContext());
			}
			expect(extension.tools.get("run_workflow")!.definition.exposure).toBe(
				"model-only",
			);
			expect(
				extension.tools.get("run_workflow")!.definition.annotations,
			).toEqual({
				readOnlyHint: false,
			});
			const rules: string[] =
				extension.tools.get("run_workflow")!.definition.promptGuidelines!;
			expect(rules).toEqual([
				"Use run_workflow when decomposition into independent or sequential child-agent steps reduces context or verification risk.",
				"Use dynamic extensions when a workflow needs a reusable, task-specific capability; read the ultra-authoring skill for how to build and load them.",
			]);
			for (const rule of rules)
				expect(session.session.systemPrompt.split(rule)).toHaveLength(2);
			session.session.setActiveToolsByName(
				session.session
					.getActiveToolNames()
					.filter((name) => name !== "run_workflow"),
			);
			expect(session.session.systemPrompt).toContain(skillPath);
			for (const rule of rules)
				expect(session.session.systemPrompt).not.toContain(rule);
			await extension.commands
				.get("ultra")!
				.handler("", session.session.extensionRunner.createCommandContext());
			for (const rule of rules)
				expect(session.session.systemPrompt.split(rule)).toHaveLength(2);
			expect(session.session.messages).toHaveLength(0);
		},
	);

	it("does not advertise the skill when Ultra is disabled, even after completion or activation attempts", async () => {
		const extension = await start({
			settings: { ultra: { enabled: false, autoEnable: true } },
		});
		if (!session) throw new Error("missing session");
		const command = extension.commands.get("ultra")!;
		await command.getArgumentCompletions!("");
		await command.handler(
			"",
			session.session.extensionRunner.createCommandContext(),
		);
		expect(session.session.getActiveToolNames()).not.toContain("run_workflow");
		expect(session.session.systemPrompt).not.toContain(
			"ultra-authoring/SKILL.md",
		);
	});

	it("injects the effective tier policy only while active and refreshes settings each turn", async () => {
		const extension = await start();
		if (!session) throw new Error("missing session");
		const runner = session.session.extensionRunner;
		const emit = () =>
			runner.emitBeforeAgentStart(
				{ messageType: "user", prompt: "prompt" },
				{
					cwd: session?.cwd ?? process.cwd(),
				},
			);
		const policy = async () => (await emit()).systemPromptOptions.sections;
		expect((await policy())["ultra_model_tier_policy"]).toBeUndefined();
		expect((await policy())["ultra_fanout_tool_policy"]).toBeUndefined();
		await extension.commands
			.get("ultra")!
			.handler("", runner.createCommandContext());
		expect((await policy())["ultra_model_tier_policy"]).toBe(
			modelTierPrompt(DEFAULT_MODEL_TIERS),
		);
		expect((await policy())["ultra_fanout_tool_policy"]).toContain(
			"read, grep, find, ls, bash",
		);
		writeFileSync(
			join(session.cwd, ".pi", "settings.json"),
			JSON.stringify({
				ultra: {
					fanoutToolAllowlist: ["web"],
					modelTiers: {
						large: { instructions: "Architecture only." },
						fast_extract: {
							model: "custom/extractor",
							thinkingLevel: "low",
							instructions: "Select for literal extraction.",
						},
					},
				},
			}),
		);
		const updated = await policy();
		expect(updated["ultra_model_tier_policy"]).toContain("Architecture only.");
		expect(updated["ultra_model_tier_policy"]).not.toContain(
			DEFAULT_MODEL_TIERS["large"]!.instructions,
		);
		expect(updated["ultra_model_tier_policy"]).toContain(
			"- fast_extract: custom/extractor; low; Select for literal extraction.",
		);
		expect(
			updated["ultra_model_tier_policy"]?.match(/# ultra model tier policy/g),
		).toHaveLength(1);
		expect(updated["ultra_fanout_tool_policy"]).toContain("bash, web");
		writeFileSync(
			join(session.cwd, ".pi", "settings.json"),
			JSON.stringify({ ultra: { enabled: false } }),
		);
		expect((await policy())["ultra_model_tier_policy"]).toBeUndefined();
		expect((await policy())["ultra_fanout_tool_policy"]).toBeUndefined();
	});

	it("advertises which step.flags enable sub-agent extension tools while active", async () => {
		const extension = await start({
			settings: {
				ultra: {
					subagentExtensions: [
						fileURLToPath(new URL("../../nushell/index.ts", import.meta.url)),
						fileURLToPath(
							new URL("../../chrome-cdp/index.ts", import.meta.url),
						),
						fileURLToPath(new URL("../../ask/ask-tool.ts", import.meta.url)),
					],
				},
			},
		});
		if (!session) throw new Error("missing session");
		const runner = session.session.extensionRunner;
		const sections = async () =>
			(
				await runner.emitBeforeAgentStart(
					{ messageType: "user", prompt: "prompt" },
					{
						cwd: session?.cwd ?? process.cwd(),
					},
				)
			).systemPromptOptions.sections;
		expect((await sections())["ultra_subagent_flags"]).toBeUndefined();
		await extension.commands
			.get("ultra")!
			.handler("", runner.createCommandContext());
		const prompt = (await sections())["ultra_subagent_flags"] ?? "";
		expect(prompt).toContain("# ultra sub-agent flags");
		expect(prompt).toContain(
			"- nushell: nu; --nushell (boolean): Enable Nushell tools at startup instead of bash and powershell",
		);
		expect(prompt).toContain("- chrome-cdp: chrome_cdp; --chrome (boolean)");
		// ask registers tools but no flags, so it is not listed.
		expect(prompt).not.toContain("- ask:");
	});

	it("rejects unknown tiers before either surface starts work", async () => {
		const extension = await start();
		if (!session) throw new Error("missing session");
		const ctx = session.session.extensionRunner.createCommandContext();
		await extension.commands.get("ultra")!.handler("", ctx);
		const spec = {
			name: "unknown-tier",
			phases: [
				{
					id: "first",
					kind: "single",
					step: { summary: "First", prompt: "First", model: "medium" },
				},
				{
					id: "second",
					kind: "single",
					step: { summary: "Second", prompt: "Second", model: "missing_tier" },
				},
			],
		};
		const tool = extension.tools.get("run_workflow")!.definition;
		await expect(
			tool.execute(
				"call",
				{ spec },
				undefined,
				undefined,
				createToolContext({ ui: ctx.ui, sessionManager: ctx.sessionManager }),
			),
		).rejects.toThrow('unknown model tier "missing_tier"');
		const directory = join(session.cwd, ".pi", "workflows");
		mkdirSync(directory, { recursive: true });
		writeFileSync(join(directory, "unknown-tier.json"), JSON.stringify(spec));
		const custom = vi.fn();
		Object.assign(ctx.ui, { custom });
		await extension.commands.get("ultra")!.handler("run unknown-tier", ctx);
		expect(custom).not.toHaveBeenCalled();
		expect(uiCallsFor("notify").at(-1)?.args).toEqual([
			'ultra: unknown model tier "missing_tier". Configure ultra.modelTiers or use provider/model.',
			"error",
		]);
	});

	it.each(["command", "tool"])(
		"inherits the parent's session directory through the %s surface",
		async (surface) => {
			const extension = await start({ factory: true });
			if (!session) throw new Error("missing session");
			saveWorkflow("session-directory");
			const sessionDir = join(session.cwd, "custom-sessions");
			const parent = SessionManager.create(session.cwd, sessionDir);
			const ctx = {
				...session.session.extensionRunner.createCommandContext(),
				sessionManager: parent,
			};
			const create = vi
				.spyOn(SessionManager, "create")
				.mockImplementation(() => {
					throw new Error("Stop before provider access");
				});

			if (surface === "command") {
				driveOverlay(ctx as unknown as ExtensionCommandContext);
				await extension.commands
					.get("ultra")!
					.handler("run session-directory", ctx);
			} else {
				await extension.commands.get("ultra")!.handler("", ctx);
				await extension.tools.get("run_workflow")!.definition.execute(
					"call",
					{ name: "session-directory" },
					undefined,
					undefined,
					createToolContext({
						ui: ctx.ui,
						sessionManager: parent,
					}),
				);
			}

			expect(create).toHaveBeenCalledWith(session.cwd, parent.getSessionDir(), {
				parentSession: parent.getSessionFile(),
			});
		},
	);

	it.each([false, true])(
		"bounds orchestrator content while retaining UI details (oversized: %s)",
		async (oversized) => {
			const extension = await start();
			const ctx = session?.session.extensionRunner.createCommandContext();
			if (!ctx) throw new Error("missing session");
			await extension.commands.get("ultra")!.handler("", ctx);
			const answer = oversized ? "界".repeat(30_000) : "Final answer";
			const response = await extension.tools
				.get("run_workflow")!
				.definition.execute(
					"call",
					{
						spec: {
							name: "context-budget",
							phases: [
								{
									id: "work",
									kind: "single",
									when: "{args.run}",
									step: { summary: "Unused", prompt: "Unused" },
								},
							],
							return: "{args.answer}",
						},
						args: { run: false, answer },
					},
					undefined,
					undefined,
					createToolContext(),
				);
			const details = response.details as {
				workflowResult: {
					result: unknown;
					phaseResults: Record<string, unknown[]>;
				};
				fullOutputPath?: string;
			};
			const body = JSON.parse((response.content[0] as { text: string }).text);
			try {
				expect(details.workflowResult.result).toBe(answer);
				expect(details.workflowResult.phaseResults).toEqual({
					work: [],
				});
				expect(body.phaseResults).toBeUndefined();
				if (oversized) {
					expect(body.truncated).toBe(true);
					expect(body.fullOutputPath).toBe(details.fullOutputPath);
					expect({
						...JSON.parse(readFileSync(body.fullOutputPath, "utf8")),
						fullOutputPath: body.fullOutputPath,
					}).toEqual(details.workflowResult);
				} else {
					expect(body.fullOutputPath).toBe(details.fullOutputPath);
					expect(
						JSON.parse(readFileSync(body.fullOutputPath, "utf8")).result,
					).toBe(answer);
					expect(body.result).toBe(answer);
					expect(body.phases).toEqual([
						{ id: "work", ran: 0, ok: 0, dropped: 0 },
					]);
					expect(body.truncated).toBeUndefined();
				}
			} finally {
				if (details.fullOutputPath)
					rmSync(dirname(details.fullOutputPath), {
						recursive: true,
						force: true,
					});
			}
		},
	);

	it.each(["command-output", "review", "research"])(
		"keeps %s command context bounded and its evidence retrievable",
		async (name) => {
			const extension = await start();
			if (!session) throw new Error("missing session");
			saveWorkflow(name);
			const ctx = session.session.extensionRunner.createCommandContext();
			const result = {
				workflow: name,
				phases: [{ id: "work", ran: 1, ok: 1, dropped: 0 }],
				phaseResults: {
					work: [{ ok: true, value: "INTERMEDIATE".repeat(10000) }],
				},
				phaseFailures: {},
				result: [{ status: "blocked", blockers: ["Missing evidence"] }],
				report: { summary: "Human report" },
				steered: false,
				dynamicExtensions: [],
				tokenUsage: {
					input: 1,
					output: 2,
					total: 3,
					cacheRead: 0,
					cacheWrite: 0,
					cost: 0,
				},
			};
			Object.assign(ctx.ui, {
				custom: vi.fn().mockResolvedValue({ status: "completed", result }),
			});
			await extension.commands.get("ultra")!.handler(`run ${name}`, ctx);
			expect(
				uiCallsFor("notify").some(
					(call) =>
						call.args[0] ===
						`ultra: "${name}" complete · 1 phases · $0.0000 · 2 output.`,
				),
			).toBe(true);
			const message = session.session.messages.find(
				(message): message is Extract<typeof message, { role: "custom" }> =>
					"customType" in message && message.customType === "ultra-result",
			);
			if (!message || typeof message.content !== "string")
				throw new Error("Missing command result");
			const body = JSON.parse(message.content);
			try {
				expect(body.result).toEqual(result.result);
				expect(body.report).toEqual(result.report);
				expect(body.executionStatus).toBe("finished");
				expect(body.phaseResults).toBeUndefined();
				expect(message.content).not.toContain("INTERMEDIATE");
				expect(message.details).toEqual({
					...result,
					fullOutputPath: body.fullOutputPath,
				});
				expect(JSON.parse(readFileSync(body.fullOutputPath, "utf8"))).toEqual(
					result,
				);
			} finally {
				rmSync(dirname(body.fullOutputPath), { recursive: true, force: true });
			}
		},
	);

	it("completes subcommands first and saved workflows below run", async () => {
		const extension = await start();
		if (!session) throw new Error("missing session");
		const complete = extension.commands.get("ultra")!.getArgumentCompletions!;
		expect(extension.tools.has("run_workflow")).toBe(false);
		const subcommands = (await complete(""))!;
		const workflows = (await complete("run "))!;

		expect(extension.tools.has("run_workflow")).toBe(true);
		expect(session.session.getActiveToolNames()).not.toContain("run_workflow");
		expect(subcommands.map((item: { value: string }) => item.value)).toEqual([
			"exec",
			"run",
		]);
		expect(workflows.map((item: { value: string }) => item.value)).toEqual(
			expect.arrayContaining(["run research", "run review"]),
		);
	});

	it("activates the workflow tool and notifies without starting a turn", async () => {
		const extension = await start();
		if (!session) throw new Error("missing session");
		const beforeMessages = session.session.messages.length;
		const beforeNotifications = uiCallsFor("notify").length;

		expect(session.session.getActiveToolNames()).not.toContain("run_workflow");
		expect(session.session.systemPrompt).not.toContain("- run_workflow:");
		await extension.commands
			.get("ultra")!
			.handler("", session.session.extensionRunner.createCommandContext());

		expect(session.session.getActiveToolNames()).toContain("run_workflow");
		expect(session.session.systemPrompt).toContain(
			"- run_workflow: run saved or inline multi-agent workflows.",
		);
		expect(session.session.systemPrompt).toContain(
			"Use run_workflow when decomposition into independent or sequential child-agent steps reduces context or verification risk.",
		);
		expect(session.session.messages).toHaveLength(beforeMessages);
		const notifications = uiCallsFor("notify");
		expect(notifications).toHaveLength(beforeNotifications + 1);
		expect(notifications.at(-1)?.args).toEqual([
			"ultra: run_workflow tool enabled.",
			"info",
		]);
	});

	it("sends exec instructions as the visible user message that starts the turn", async () => {
		const extension = await start();
		if (!session) throw new Error("missing session");
		const sendUserMessage = vi
			.spyOn(session.session, "sendUserMessage")
			.mockResolvedValue();
		const beforeNotifications = uiCallsFor("notify").length;

		await extension.commands
			.get("ultra")!
			.handler(
				"exec inspect this failure once",
				session.session.extensionRunner.createCommandContext(),
			);

		expect(session.session.getActiveToolNames()).toContain("run_workflow");
		expect(sendUserMessage).toHaveBeenCalledOnce();
		const prompt = sendUserMessage.mock.calls[0]?.[0];
		expect(prompt).toBe(
			"# ultra exec\n\n# user request\n\ninspect this failure once",
		);
		const guidance =
			extension.tools.get("run_workflow")!.definition.promptGuidelines!;
		for (const rule of guidance) {
			expect(session.session.systemPrompt.split(rule)).toHaveLength(2);
			expect(prompt).not.toContain(rule);
		}
		expect(session.session.systemPrompt).not.toContain(
			"# Authoring ultra workflows",
		);
		expect(session.session.systemPrompt).not.toContain("## Worked example");
		expect(prompt).not.toContain("The workflow tool is now available");
		const injected = await session.session.extensionRunner.emitBeforeAgentStart(
			{ messageType: "user", prompt: prompt as string },
			{ cwd: session.cwd },
		);
		expect(
			injected.systemPromptOptions.sections["ultra_model_tier_policy"],
		).toBe(modelTierPrompt(DEFAULT_MODEL_TIERS));
		expect(injected.systemPromptOptions.forceSystemPrompt).toBeUndefined();
		expect(prompt).not.toContain(DEFAULT_MODEL_TIERS["large"]!.instructions);
		expect(uiCallsFor("notify")).toHaveLength(beforeNotifications);
	});

	it("renders workflow progress as an overlay without replacing session content", async () => {
		const extension = await start();
		if (!session) throw new Error("missing session");
		const ctx = session.session.extensionRunner.createCommandContext();
		const custom = vi.fn().mockResolvedValue(null);
		Object.assign(ctx.ui, { custom });

		await extension.commands
			.get("ultra")!
			.handler("run review inspect scrolling", ctx);

		expect(custom).toHaveBeenCalledOnce();
		expect(custom.mock.calls[0]![1]).toEqual({
			overlay: true,
			overlayOptions: {
				anchor: "bottom-left",
				width: "100%",
				maxHeight: "100%",
			},
		});
	});

	it("surfaces workflow errors instead of misreporting them as user aborts", async () => {
		const extension = await start();
		if (!session) throw new Error("missing session");
		saveWorkflow("runtime-error", "missing-live-capability");
		const ctx = session.session.extensionRunner.createCommandContext();
		driveOverlay(ctx);

		await extension.commands.get("ultra")!.handler("run runtime-error", ctx);

		expect(uiCallsFor("notify").at(-1)?.args).toEqual([
			'ultra: dynamic extension "missing-live-capability" has no canonical revision. Run a builder with all four dynamic-extension tools.',
			"error",
		]);
	});

	it("prepares dynamic extension runs on both command and tool surfaces", async () => {
		const message =
			'ultra: dynamic extension "missing-live-capability" has no canonical revision. Run a builder with all four dynamic-extension tools.';
		const extension = await start();
		if (!session) throw new Error("missing session");
		saveWorkflow("runtime-error-command", "missing-live-capability");
		saveWorkflow("runtime-error-tool", "missing-live-capability");
		const ctx = session.session.extensionRunner.createCommandContext();
		driveOverlay(ctx);
		await extension.commands
			.get("ultra")!
			.handler("run runtime-error-command", ctx);
		expect(uiCallsFor("notify").at(-1)?.args).toEqual([message, "error"]);

		await extension.commands.get("ultra")!.handler("", ctx);
		await expect(
			extension.tools
				.get("run_workflow")!
				.definition.execute(
					"call",
					{ name: "runtime-error-tool" },
					undefined,
					undefined,
					createToolContext({ ui: ctx.ui }),
				),
		).rejects.toThrow(message);
	});

	it("refuses project workflows on both surfaces when the project is untrusted", async () => {
		const extension = await start();
		if (!session) throw new Error("missing session");
		saveWorkflow("repo-owned");
		const path = join(session.cwd, ".pi", "workflows", "repo-owned.json");
		const message = `ultra: refused workflow "repo-owned" from untrusted project file ${path}. Project workflows are repo-controlled; trust this project to run it.`;
		session.session.settingsManager.setProjectTrusted(false);
		vi.spyOn(process, "cwd").mockReturnValue(session.cwd);
		const ctx = session.session.extensionRunner.createCommandContext();
		expect(ctx.isProjectTrusted()).toBe(false);
		const command = extension.commands.get("ultra")!;

		const completions = await command.getArgumentCompletions!("run ");
		expect(completions?.map((item) => item.value)).not.toContain(
			"run repo-owned",
		);
		expect(completions?.map((item) => item.value)).toContain("run review");

		const custom = vi.fn();
		Object.assign(ctx.ui, { custom });
		await command.handler("run repo-owned", ctx);
		expect(custom).not.toHaveBeenCalled();
		expect(uiCallsFor("notify").at(-1)?.args).toEqual([message, "error"]);

		await command.handler("", ctx);
		await expect(
			extension.tools
				.get("run_workflow")!
				.definition.execute(
					"call",
					{ name: "repo-owned" },
					undefined,
					undefined,
					createToolContext({ ui: ctx.ui }),
				),
		).rejects.toThrow(message);
	});

	it("offers project workflows with their source when the project is trusted", async () => {
		const extension = await start();
		if (!session) throw new Error("missing session");
		saveWorkflow("repo-owned");
		vi.spyOn(process, "cwd").mockReturnValue(session.cwd);
		const ctx = session.session.extensionRunner.createCommandContext();
		expect(ctx.isProjectTrusted()).toBe(true);

		const completions =
			await extension.commands.get("ultra")!.getArgumentCompletions!("run re");
		expect(completions).toEqual(
			expect.arrayContaining([
				{
					value: "run repo-owned",
					label: "repo-owned",
					description: "project",
				},
				{ value: "run review", label: "review", description: "bundled" },
			]),
		);
	});

	it("reports confirmed whole-run cancellation as aborted while retaining its aggregate", async () => {
		const extension = await start();
		if (!session) throw new Error("missing session");
		saveWorkflow("cancelled-run");
		const ctx = session.session.extensionRunner.createCommandContext();
		driveOverlay(ctx, (overlay) => {
			overlay.handleInput("\u001b");
			overlay.handleInput("\u001b");
		});

		await extension.commands.get("ultra")!.handler("run cancelled-run", ctx);

		expect(uiCallsFor("notify").at(-1)?.args).toEqual([
			'ultra: "cancelled-run" aborted · 1 phases · $0.0000 · 0 output.',
			"warning",
		]);
		expect(
			uiCallsFor("notify").some((call) =>
				String(call.args[0]).includes("complete"),
			),
		).toBe(false);
		const message = session.session.messages.find(
			(message): message is Extract<typeof message, { role: "custom" }> =>
				"customType" in message && message.customType === "ultra-result",
		);
		const body = JSON.parse(String(message?.content));
		try {
			expect(body.executionStatus).toBe("aborted");
			expect(
				JSON.parse(readFileSync(body.fullOutputPath, "utf8")).aborted,
			).toBe(true);
		} finally {
			rmSync(dirname(body.fullOutputPath), { recursive: true, force: true });
		}
	});

	it("refuses a legacy bare sub-agent extension nickname", async () => {
		const extension = await start({
			settings: { ultra: { subagentExtensions: ["missing-extension"] } },
		});
		if (!session) throw new Error("missing session");

		await extension.commands
			.get("ultra")!
			.handler(
				"run review",
				session.session.extensionRunner.createCommandContext(),
			);

		expect(uiCallsFor("notify").at(-1)?.args).toEqual([
			'ultra: subagentExtensions no longer accepts bare extension nickname "missing-extension"; replace it with a Pi extension source path or package source.',
			"error",
		]);
	});

	it.each(["command", "tool"])(
		"names excluded tool owners and startup flags through the %s surface",
		async (surface) => {
			const extension = await start({
				settings: {
					ultra: {
						subagentExtensions: [
							fileURLToPath(new URL("../../ask/index.ts", import.meta.url)),
						],
					},
				},
				env: { PI_NUSHELL_ENABLE: "false" },
				extra: [
					fileURLToPath(new URL("../../nushell/index.ts", import.meta.url)),
				],
			});
			if (!session) throw new Error("missing session");
			const spec = {
				name: "excluded-nushell",
				phases: [
					{
						id: "work",
						kind: "single",
						step: {
							summary: "Work",
							prompt: "Work",
							tools: ["nu"],
							flags: { nushell: true },
						},
					},
				],
			};
			const ctx = session.session.extensionRunner.createCommandContext();
			await extension.commands.get("ultra")!.handler("", ctx);
			let message: string;
			if (surface === "command") {
				const directory = join(session.cwd, ".pi", "workflows");
				mkdirSync(directory, { recursive: true });
				writeFileSync(
					join(directory, `${spec.name}.json`),
					JSON.stringify(spec),
				);
				await extension.commands.get("ultra")!.handler(`run ${spec.name}`, ctx);
				message = String(uiCallsFor("notify").at(-1)?.args[0]);
			} else {
				message = await extension.tools
					.get("run_workflow")!
					.definition.execute(
						"call",
						{ spec },
						undefined,
						undefined,
						createToolContext(),
					)
					.then(
						() => "unexpected success",
						(error: Error) => error.message,
					);
			}
			expect(message).toContain("requires unavailable tools: nu");
			expect(message).toContain(
				'owning extension "nushell" is excluded by ultra.subagentExtensions',
			);
			expect(message).toContain(
				`include ${JSON.stringify(resolve("extensions/nushell/index.ts"))} in that setting before using its step.flags`,
			);
			expect(message).toContain("- nushell: nu; --nushell (boolean)");
			expect(message).not.toContain("unexpected success");
		},
	);

	it("diagnoses a loaded JS owner after package selection changes to TS without widening authorization", async () => {
		await start();
		if (!session) throw new Error("missing session");
		const extensionDir = join(session.cwd, "owner-fixture");
		mkdirSync(extensionDir);
		const priorPath = join(extensionDir, "prior.js");
		const replacementPath = join(extensionDir, "replacement.ts");
		const otherPath = join(extensionDir, "other.ts");
		const source = (flag: string) =>
			[
				'import { Type } from "typebox";',
				"export default (pi) => {",
				`  pi.registerFlag(${JSON.stringify(flag)}, { type: "boolean" });`,
				'  pi.registerTool({ name: "fixture_tool", label: "fixture_tool", description: "fixture", parameters: Type.Object({}), execute: async () => ({ content: [{ type: "text", text: "ok" }] }) });',
				"};",
				"",
			].join("\n");
		writeFileSync(priorPath, source("prior-owner"));
		writeFileSync(replacementPath, source("replacement-owner"));
		writeFileSync(otherPath, source("other-owner"));
		writeFileSync(
			join(extensionDir, "package.json"),
			JSON.stringify({ pi: { extensions: ["prior.js"] } }),
		);
		await session.dispose();
		writeFileSync(
			join(session.cwd, ".pi", "settings.json"),
			JSON.stringify({ ultra: { subagentExtensions: [extensionDir] } }),
		);
		session = await createPiSession({
			cwd: cwd!,
			extensionPaths: [ultraPath(), priorPath],
		});
		installUi();
		writeFileSync(
			join(extensionDir, "package.json"),
			JSON.stringify({ pi: { extensions: ["replacement.ts"] } }),
		);
		const spec = {
			name: "changed-entry",
			phases: [
				{
					id: "work",
					kind: "single",
					step: {
						summary: "Work",
						prompt: "Work",
						tools: ["fixture_tool"],
					},
				},
			],
		};
		const createChild = vi.spyOn(SessionManager, "inMemory");
		const staleExtension = session.extensions.find((item) =>
			item.commands.has("ultra"),
		)!;
		await staleExtension.commands
			.get("ultra")!
			.handler("", session.session.extensionRunner.createCommandContext());
		const mismatch = await staleExtension.tools
			.get("run_workflow")!
			.definition.execute(
				"call",
				{ spec },
				undefined,
				undefined,
				createToolContext(),
			)
			.then(
				() => "unexpected success",
				(error: Error) => error.message,
			);
		expect(mismatch).toContain("loaded owning extension");
		expect(mismatch).toContain("does not match selected extension entries");
		expect(mismatch).toContain(
			"runtime may be stale or explicit selection differs",
		);
		expect(mismatch).toContain("Reload/restart Pi");
		expect(mismatch).not.toContain("include");
		expect(mismatch).toContain("replacement-owner");
		expect(mismatch).not.toContain("prior-owner");
		expect(createChild).not.toHaveBeenCalled();
		createChild.mockRestore();

		await session.dispose();
		session = await createPiSession({
			cwd: cwd!,
			extensionPaths: [ultraPath(), replacementPath],
		});
		installUi();
		const freshExtension = session.extensions.find((item) =>
			item.commands.has("ultra"),
		)!;
		await freshExtension.commands
			.get("ultra")!
			.handler("", session.session.extensionRunner.createCommandContext());
		const reachedChildCreation = vi
			.spyOn(SessionManager, "inMemory")
			.mockImplementation(() => {
				throw new Error("Stop before provider access");
			});
		const freshResponse = await freshExtension.tools
			.get("run_workflow")!
			.definition.execute(
				"call",
				{ spec },
				undefined,
				undefined,
				createToolContext(),
			);
		expect(reachedChildCreation).toHaveBeenCalled();
		expect(freshResponse.details).toBeDefined();
		reachedChildCreation.mockRestore();

		await session.dispose();
		writeFileSync(
			join(session.cwd, ".pi", "settings.json"),
			JSON.stringify({ ultra: { subagentExtensions: [otherPath] } }),
		);
		session = await createPiSession({
			cwd: cwd!,
			extensionPaths: [ultraPath(), priorPath],
		});
		installUi();
		const excludedExtension = session.extensions.find((item) =>
			item.commands.has("ultra"),
		)!;
		await excludedExtension.commands
			.get("ultra")!
			.handler("", session.session.extensionRunner.createCommandContext());
		const noChild = vi.spyOn(SessionManager, "inMemory");
		const excluded = await excludedExtension.tools
			.get("run_workflow")!
			.definition.execute(
				"call",
				{ spec },
				undefined,
				undefined,
				createToolContext(),
			)
			.then(
				() => "unexpected success",
				(error: Error) => error.message,
			);
		expect(excluded).toContain("does not match selected extension entries");
		expect(excluded).toContain(JSON.stringify(otherPath));
		expect(excluded).not.toContain("include");
		expect(noChild).not.toHaveBeenCalled();
	});

	it("reports unknown tools without inventing an owning extension or flag", async () => {
		const extension = await start();
		if (!session) throw new Error("missing session");
		const ctx = session.session.extensionRunner.createCommandContext();
		await extension.commands.get("ultra")!.handler("", ctx);
		await expect(
			extension.tools.get("run_workflow")!.definition.execute(
				"call",
				{
					spec: {
						name: "unknown-tool",
						phases: [
							{
								id: "work",
								kind: "single",
								step: {
									summary: "Work",
									prompt: "Work",
									tools: ["not_installed"],
								},
							},
						],
					},
				},
				undefined,
				undefined,
				createToolContext(),
			),
		).rejects.toThrow(
			"not_installed: no registered owning extension; check step.tools and installed extensions.",
		);
	});

	describe("inactive-tool preflight", () => {
		const nushellPath = () =>
			fileURLToPath(new URL("../../nushell/index.ts", import.meta.url));

		function specWith(step: Record<string, unknown>) {
			return {
				name: "inactive-preflight",
				phases: [
					{
						id: "work",
						kind: "fanout",
						over: ["a", "b", "c"],
						step: { summary: "Work {item}", prompt: "Work {item}", ...step },
					},
				],
			};
		}

		function deactivate(...names: string[]): void {
			if (!session) throw new Error("missing session");
			session.session.setActiveToolsByName(
				session.session
					.getActiveToolNames()
					.filter((name) => !names.includes(name)),
			);
		}

		it.each(["command", "tool"])(
			"refuses a step listing a registered-but-inactive tool before creating children through the %s surface",
			async (surface) => {
				const extension = await start({
					settings: { ultra: { subagentExtensions: [nushellPath()] } },
				});
				if (!session) throw new Error("missing session");
				// Like `pi --nushell`: bash is registered but switched off in this Pi.
				deactivate("bash");
				expect(session.session.getActiveToolNames()).not.toContain("bash");
				const spec = specWith({ tools: ["read", "bash"] });
				const ctx = session.session.extensionRunner.createCommandContext();
				const create = vi.spyOn(SessionManager, "create");
				const inMemory = vi.spyOn(SessionManager, "inMemory");
				let message: string;
				if (surface === "command") {
					const directory = join(session.cwd, ".pi", "workflows");
					mkdirSync(directory, { recursive: true });
					writeFileSync(
						join(directory, `${spec.name}.json`),
						JSON.stringify(spec),
					);
					const custom = vi.fn();
					Object.assign(ctx.ui, { custom });
					await extension.commands
						.get("ultra")!
						.handler(`run ${spec.name}`, ctx);
					expect(custom).not.toHaveBeenCalled();
					expect(uiCallsFor("notify").at(-1)?.args[1]).toBe("error");
					message = String(uiCallsFor("notify").at(-1)?.args[0]);
				} else {
					await extension.commands.get("ultra")!.handler("", ctx);
					message = await extension.tools
						.get("run_workflow")!
						.definition.execute(
							"call",
							{ spec },
							undefined,
							undefined,
							createToolContext(),
						)
						.then(
							() => "unexpected success",
							(error: Error) => error.message,
						);
				}
				expect(message).toBe(
					"ultra: step tools are inactive in this Pi and children inherit its flags: bash. Possibly deactivated by an extension with startup flags: nushell (--nushell: Enable Nushell tools at startup instead of bash and powershell). Use an active alternative or set step.flags.",
				);
				expect(create).not.toHaveBeenCalled();
				expect(inMemory).not.toHaveBeenCalled();
			},
		);

		it("recommends the active nu tool when bash is inactive", async () => {
			const extension = await start({
				settings: { ultra: { subagentExtensions: [nushellPath()] } },
				env: { PI_NUSHELL_ENABLE: "false" },
				extra: [nushellPath()],
			});
			if (!session) throw new Error("missing session");
			deactivate("bash");
			session.session.setActiveToolsByName([
				...session.session.getActiveToolNames(),
				"nu",
			]);
			const ctx = session.session.extensionRunner.createCommandContext();
			await extension.commands.get("ultra")!.handler("", ctx);
			await expect(
				extension.tools
					.get("run_workflow")!
					.definition.execute(
						"call",
						{ spec: specWith({ tools: ["bash"] }) },
						undefined,
						undefined,
						createToolContext(),
					),
			).rejects.toThrow(
				"Use an active alternative or set step.flags. The nu tool is active; prefer it.",
			);
		});

		// The parent runs in memory, so children are minted through `inMemory`;
		// stopping there proves the preflight let child creation begin.
		async function runPastPreflight(step: Record<string, unknown>) {
			const extension = await start({
				settings: { ultra: { subagentExtensions: [nushellPath()] } },
			});
			if (!session) throw new Error("missing session");
			deactivate("bash");
			const ctx = session.session.extensionRunner.createCommandContext();
			await extension.commands.get("ultra")!.handler("", ctx);
			const inMemory = vi
				.spyOn(SessionManager, "inMemory")
				.mockImplementation(() => {
					throw new Error("Stop before provider access");
				});
			const response = await extension.tools
				.get("run_workflow")!
				.definition.execute(
					"call",
					{ spec: specWith(step) },
					undefined,
					undefined,
					createToolContext(),
				);
			const details = response.details as {
				workflowResult: {
					phaseFailures: Record<string, Array<{ message: string }>>;
				};
				fullOutputPath?: string;
			};
			if (details.fullOutputPath)
				rmSync(dirname(details.fullOutputPath), {
					recursive: true,
					force: true,
				});
			expect(inMemory).toHaveBeenCalled();
			const messages = (details.workflowResult.phaseFailures["work"] ?? []).map(
				(failure) => failure.message,
			);
			expect(messages).toHaveLength(3);
			for (const message of messages) {
				expect(message).toContain("Stop before provider access");
				expect(message).not.toContain("step tools are inactive");
			}
		}

		it("skips the preflight for a step that declares its own flags", async () => {
			await runPastPreflight({ tools: ["bash"], flags: { nushell: false } });
		});

		// grep/find/ls are registered but inactive in a stock Pi; children activate
		// them explicitly, so they never trigger the preflight.
		it("passes a step listing active tools and Pi's optional builtins", async () => {
			await runPastPreflight({ tools: ["read", "grep", "find", "ls"] });
		});
	});

	it("starts research without knowing which extension supplies research tools", async () => {
		const extension = await start();
		if (!session) throw new Error("missing session");
		const ctx = session.session.extensionRunner.createCommandContext();
		const custom = vi.fn().mockResolvedValue(null);
		Object.assign(ctx.ui, { custom });

		await extension.commands
			.get("ultra")!
			.handler("run research question", ctx);

		expect(custom).toHaveBeenCalledOnce();
		expect(
			uiCallsFor("notify").some((call) =>
				String(call.args[0]).includes("unavailable tools"),
			),
		).toBe(false);
	});

	it("discovers a workflow saved after the extension loaded without /reload", async () => {
		const extension = await start();
		if (!session) throw new Error("missing session");
		const complete = () =>
			extension.commands.get("ultra")!.getArgumentCompletions!("run ");
		await complete();

		const previousCwd = process.cwd();
		try {
			process.chdir(session.cwd);
			const directory = join(session.cwd, ".pi", "workflows");
			mkdirSync(directory, { recursive: true });
			writeFileSync(
				join(directory, "fresh.json"),
				`${JSON.stringify({
					name: "fresh",
					phases: [
						{ id: "p", kind: "single", step: { summary: "hi", prompt: "hi" } },
					],
				})}\n`,
			);

			const items = (await complete())!;
			expect(items.map((item: { value: string }) => item.value)).toContain(
				"run fresh",
			);
		} finally {
			process.chdir(previousCwd);
		}
	});

	it.each([
		{
			params: {},
			expected: ['provide either a workflow "name" or an inline "spec"'],
		},
		{
			params: { name: "does-not-exist" },
			expected: ['unknown workflow "does-not-exist"', "Available:", "review"],
		},
		{ params: { args: "not-an-object" }, expected: ["args", "object"] },
		{
			params: {
				spec: {
					name: "invalid",
					phases: [{ id: "work", kind: "single", step: { prompt: "Work" } }],
				},
			},
			expected: ["summary"],
		},
	])(
		"delivers actionable argument errors to the agent and the tool UI: $params",
		async ({ params, expected }) => {
			const extension = await start();
			if (!session) throw new Error("missing session");
			const ctx = session.session.extensionRunner.createCommandContext();
			await extension.commands.get("ultra")!.handler("", ctx);
			// Use the real tool boundary through the owned fixture's scripted
			// provider: the agent turns a thrown execute() into an isError
			// toolResult surfaced back to the model.
			const followUp = vi.fn((context: Context) => {
				const result = context.messages.findLast(
					(message) => message.role === "toolResult",
				);
				expect(result?.isError).toBe(true);
				const error = result?.content
					.filter((part) => part.type === "text")
					.map((part) => part.text)
					.join("\n");
				for (const text of expected) expect(error).toContain(text);
				return fauxAssistantMessage("Error received.");
			});
			session.setResponses([
				fauxAssistantMessage(
					fauxToolCall("run_workflow", params as JsonObject),
					{
						stopReason: "toolUse",
					},
				),
				followUp,
			]);
			await session.session.prompt("Exercise invalid workflow arguments");
			expect(followUp).toHaveBeenCalledOnce();
			const toolResults = session.session.messages.filter(
				(message) => message.role === "toolResult",
			);
			expect(toolResults).toHaveLength(1);
			const result = toolResults[0]!;
			expect(result.isError).toBe(true);
			const resultText = result.content
				.filter((part) => part.type === "text")
				.map((part) => part.text)
				.join("\n");
			for (const text of expected) expect(resultText).toContain(text);
			const message = session.session.messages.find(
				(message): message is Extract<typeof message, { role: "toolResult" }> =>
					message.role === "toolResult",
			);
			if (!message) throw new Error("missing tool result message");
			expect(message).toMatchObject({
				role: "toolResult",
				isError: true,
				content: result.content,
			});
			expect(session.session.messages.at(-1)).toMatchObject({
				role: "assistant",
			});

			initTheme();
			const theme = {
				fg: (_color: string, text: string) => text,
				bold: (text: string) => text,
			} as Theme;
			const tool = extension.tools.get("run_workflow")!.definition;
			const renderResult = tool.renderResult!;
			const toolResult = message as Parameters<typeof renderResult>[0];
			const renderContext = {
				isError: true,
			} as Parameters<typeof renderResult>[3];
			const collapsed = renderResult(
				toolResult,
				{ expanded: false, isPartial: false },
				theme,
				renderContext,
			)
				.render(120)
				.join("\n");
			expect(collapsed).toContain("ultra · failed:");
			expect(collapsed).not.toContain("0/0 done");
			const expanded = renderResult(
				toolResult,
				{ expanded: true, isPartial: false },
				theme,
				renderContext,
			)
				.render(120)
				.join("\n");
			for (const text of expected) expect(expanded).toContain(text);
		},
	);

	it("exposes the workflow schema while rejecting malformed specs before execution", async () => {
		const extension = await start();
		if (!session) throw new Error("missing session");
		await extension.commands.get("ultra")!.getArgumentCompletions!("");
		const tool = extension.tools.get("run_workflow")!.definition;
		const parameters = tool.parameters as {
			properties: {
				spec: {
					type: string;
					properties: Record<string, unknown>;
					additionalProperties?: unknown;
				};
				background?: unknown;
			};
		};
		const specSchema = parameters.properties.spec;
		expect(tool.renderCall).toBeTypeOf("function");
		expect(specSchema.type).toBe("object");
		expect(specSchema.properties).toHaveProperty("name");
		expect(specSchema.properties).toHaveProperty("phases");
		expect(specSchema.properties).toHaveProperty("report");
		expect(specSchema.additionalProperties).not.toBe(true);

		expect(tool.description).toContain(
			"run saved or inline multi-agent workflows.",
		);
		expect(tool.promptSnippet).toBe(
			"run saved or inline multi-agent workflows.",
		);
		expect(tool.promptGuidelines).toEqual([
			"Use run_workflow when decomposition into independent or sequential child-agent steps reduces context or verification risk.",
			"Use dynamic extensions when a workflow needs a reusable, task-specific capability; read the ultra-authoring skill for how to build and load them.",
		]);
		expect(parameters.properties.background).toBeUndefined();
		expect(JSON.parse(JSON.stringify(specSchema))).toEqual(
			JSON.parse(JSON.stringify(WorkflowSpecSchema)),
		);
		const step = { summary: "Work", prompt: "Work" };
		for (const spec of [
			{},
			{ name: "invalid", phases: [] },
			{ name: "invalid", phases: [{ id: "work", kind: "fanout", step }] },
			{
				name: "invalid",
				phases: [{ id: "work", kind: "single", step: { prompt: "Work" } }],
			},
			{
				name: "invalid",
				phases: [
					{
						id: "work",
						kind: "single",
						step: { ...step, thinkingLevel: "invalid" },
					},
				],
			},
			{
				name: "invalid",
				phases: [
					{ id: "work", kind: "single", step: { ...step, schema: "missing" } },
				],
			},
			{ name: "invalid", phases: [{ id: "args", kind: "single", step }] },
		]) {
			await expect(
				tool.execute(
					"invalid",
					{ spec },
					undefined,
					undefined,
					createToolContext(),
				),
			).rejects.toThrow("Invalid workflow spec");
		}
	});
});