長時間稼働するエージェント

起動 → onStart() → イベント処理 → アイドル（約 2 分） → 休止
  ▲                                                      │
  └──────────── アラームまたはリクエストで起動 ──────────┘

エビクション（クラッシュ / 再デプロイ）はいつでも発生します。
状態は SQLite に残ります。次のイベントでエージェントが再起動します。

import { Agent } from "agents";

type ProjectState = {
	name: string;
	status: "planning" | "active" | "review" | "complete";
	tasks: Task[];
	plan: Plan | null;
};

type Task = {
	id: string;
	title: string;
	status: "pending" | "in_progress" | "blocked" | "complete";
	assignee?: string;
	dueDate?: string;
	completedAt?: number;
	externalJobId?: string;
};

export class ProjectManager extends Agent<Env, ProjectState> {
	initialState: ProjectState = {
		name: "",
		status: "planning",
		tasks: [],
		plan: null,
	};
}

export class ProjectManager extends Agent<Env, ProjectState> {
	async onStart() {
		// Daily deadline check at 9am UTC — idempotent, safe across restarts
		await this.schedule(
			"0 9 * * *",
			"checkDeadlines",
			{},
			{
				idempotent: true,
			},
		);

		// Progress sync every 30 minutes
		await this.scheduleEvery(1800, "syncProgress");
	}

	async onRequest(request: Request): Promise<Response> {
		const url = new URL(request.url);

		if (url.pathname.endsWith("/github-webhook")) {
			const event = await request.json();
			await this.handleGitHubEvent(event);
			return new Response("OK");
		}

		return Response.json({
			project: this.state.name,
			status: this.state.status,
		});
	}

	async checkDeadlines() {
		/* ... find overdue tasks, broadcast alerts ... */
	}
	async syncProgress() {
		/* ... check on sub-agents, update task statuses ... */
	}
}

export class ProjectManager extends Agent<Env, ProjectState> {
	async generateProjectPlan(goal: string) {
		const result = await this.keepAliveWhile(async () => {
			const plan = await this.callLLM(`Create a project plan for: ${goal}`);
			const tasks = await this.callLLM(
				`Break this into tasks: ${JSON.stringify(plan)}`,
			);
			return { plan, tasks };
		});

		this.setState({
			...this.state,
			status: "active",
			plan: result.plan,
			tasks: result.tasks,
		});
	}
}

const dispose = await this.keepAlive();
try {
	await longWork();
} finally {
	dispose();
}

export class ProjectManager extends Agent<Env, ProjectState> {
	async executeTask(task: Task) {
		await this.runFiber(`task:${task.id}`, async (ctx) => {
			const resources = await this.gatherResources(task);
			ctx.stash({ phase: "prepared", resources, task });

			const result = await this.runSubAgent(task, resources);
			ctx.stash({ phase: "executed", result, task });

			await this.updateTaskStatus(task.id, "complete", result);
		});
	}

	async onFiberRecovered(ctx: FiberRecoveryContext) {
		if (!ctx.name.startsWith("task:")) return;
		const { phase, task } = ctx.snapshot as { phase: string; task: Task };

		if (phase === "prepared") {
			await this.executeTask(task);
		} else if (phase === "executed") {
			await this.updateTaskStatus(
				task.id,
				"complete",
				(ctx.snapshot as { result: unknown }).result,
			);
		}
	}
}

export class ProjectManager extends Agent<Env, ProjectState> {
	async startCIPipeline(task: Task) {
		const response = await fetch("https://ci.example.com/api/pipelines", {
			method: "POST",
			body: JSON.stringify({
				repo: "org/project",
				branch: "main",
				callback_url: `${this.url}/ci-callback?taskId=${task.id}`,
			}),
		});

		const { pipelineId } = await response.json();
		this.updateTask(task.id, {
			status: "in_progress",
			externalJobId: pipelineId,
		});
	}

	async onRequest(request: Request): Promise<Response> {
		const url = new URL(request.url);
		if (url.pathname.endsWith("/ci-callback")) {
			const taskId = url.searchParams.get("taskId");
			const result = await request.json();
			this.updateTask(taskId, {
				status: result.status === "success" ? "complete" : "blocked",
			});
			return new Response("OK");
		}
		// ... other routes
	}
}

export class ProjectManager extends Agent<Env, ProjectState> {
	async startVideoGeneration(task: Task) {
		const response = await fetch("https://video-api.example.com/generate", {
			method: "POST",
			body: JSON.stringify({ prompt: task.title }),
		});
		const { jobId } = await response.json();
		this.updateTask(task.id, { status: "in_progress", externalJobId: jobId });
		await this.schedule(60, "pollExternalJob", {
			taskId: task.id,
			jobId,
			attempt: 1,
		});
	}

	async pollExternalJob(payload: {
		taskId: string;
		jobId: string;
		attempt: number;
	}) {
		const response = await fetch(
			`https://video-api.example.com/status/${payload.jobId}`,
		);
		const status = await response.json();

		if (status.state === "complete" || status.state === "failed") {
			this.updateTask(payload.taskId, {
				status: status.state === "complete" ? "complete" : "blocked",
			});
			return;
		}

		const nextDelay = Math.min(60 * payload.attempt, 600);
		await this.schedule(nextDelay, "pollExternalJob", {
			...payload,
			attempt: payload.attempt + 1,
		});
	}
}

export class ProjectManager extends Agent<Env, ProjectState> {
	async startDeployment(task: Task) {
		const instanceId = await this.runWorkflow("DEPLOY_WORKFLOW", {
			taskId: task.id,
			environment: "production",
		});
		this.updateTask(task.id, {
			status: "in_progress",
			externalJobId: instanceId,
		});
	}

	async onWorkflowComplete(
		workflowName: string,
		instanceId: string,
		result?: unknown,
	) {
		const task = this.state.tasks.find((t) => t.externalJobId === instanceId);
		if (task) this.updateTask(task.id, { status: "complete" });
	}
}

ctx.stash({
	task: "Waiting for CI results",
	onSuccess: "Mark task complete, move to next step in plan",
	onFailure: "Notify team, schedule retry in 1 hour",
	relevantContext: { taskId, planStep: 3 },
});

type Plan = {
	goal: string;
	steps: PlanStep[];
	currentStep: number;
	createdAt: string;
	updatedAt: string;
};

type PlanStep = {
	id: string;
	description: string;
	status: "pending" | "in_progress" | "complete" | "failed" | "skipped";
	result?: unknown;
};

export class ProjectManager extends Agent<Env, ProjectState> {
	async createPlan(goal: string) {
		const steps = await this.keepAliveWhile(async () => {
			return this.callLLM(`
        Break down this project goal into concrete steps.
        Return a JSON array of { id, description } objects.
        Goal: ${goal}
      `);
		});

		this.setState({
			...this.state,
			plan: {
				goal,
				steps: steps.map((s: { id: string; description: string }) => ({
					...s,
					status: "pending" as const,
				})),
				currentStep: 0,
				createdAt: new Date().toISOString(),
				updatedAt: new Date().toISOString(),
			},
		});

		await this.schedule(0, "executeNextStep");
	}

	async executeNextStep() {
		const { plan } = this.state;
		if (!plan || plan.currentStep >= plan.steps.length) {
			this.setState({ ...this.state, status: "complete" });
			return;
		}

		const step = plan.steps[plan.currentStep];

		try {
			const result = await this.keepAliveWhile(() => this.executeStep(step));

			const updatedSteps = plan.steps.map((s) =>
				s.id === step.id ? { ...s, status: "complete" as const, result } : s,
			);
			this.setState({
				...this.state,
				plan: {
					...plan,
					steps: updatedSteps,
					currentStep: plan.currentStep + 1,
					updatedAt: new Date().toISOString(),
				},
			});

			await this.schedule(0, "executeNextStep");
		} catch (error) {
			const updatedSteps = plan.steps.map((s) =>
				s.id === step.id ? { ...s, status: "failed" as const } : s,
			);
			this.setState({
				...this.state,
				plan: {
					...plan,
					steps: updatedSteps,
					updatedAt: new Date().toISOString(),
				},
			});
		}
	}
}

export class ProjectManager extends Agent<Env, ProjectState> {
	async delegateTask(task: Task) {
		const researcher = await this.subAgent(
			ResearchAgent,
			`research-${task.id}`,
		);

		const findings = await researcher.research(task.title);

		this.updateTask(task.id, { status: "complete" });
		return findings;
	}
}

import { AIChatAgent } from "@cloudflare/ai-chat";
import type {
	ChatRecoveryContext,
	ChatRecoveryOptions,
} from "@cloudflare/ai-chat";

class ProjectChat extends AIChatAgent<Env> {
	override async onChatRecovery(
		ctx: ChatRecoveryContext,
	): Promise<ChatRecoveryOptions> {
		// ctx.partialText    — text generated before eviction
		// ctx.recoveryData   — whatever you stashed via this.stash()
		// ctx.messages        — full conversation history
		// ctx.createdAt       — when the interrupted turn started
		return {};
	}
}

export class ProjectManager extends Agent<Env, ProjectState> {
	async onStart() {
		await this.schedule("0 0 * * *", "housekeeping", {}, { idempotent: true });
	}

	async housekeeping() {
		const cutoff = Date.now() - 30 * 24 * 60 * 60 * 1000;
		const toArchive = this.state.tasks.filter(
			(t) => t.status === "complete" && (t.completedAt ?? 0) < cutoff,
		);
		for (const task of toArchive) {
			this
				.sql`INSERT INTO archived_tasks (id, data) VALUES (${task.id}, ${JSON.stringify(task)})`;
		}
		this.setState({
			...this.state,
			tasks: this.state.tasks.filter(
				(t) => !toArchive.some((a) => a.id === t.id),
			),
		});

		this.deleteWorkflows({
			status: ["complete", "errored"],
			createdBefore: new Date(Date.now() - 7 * 24 * 60 * 60 * 1000),
		});
	}
}

export class ProjectManager extends Agent<Env, ProjectState> {
	async completeProject() {
		const schedules = await this.listSchedules();
		for (const schedule of schedules) {
			await this.cancelSchedule(schedule.id);
		}

		this.setState({ ...this.state, status: "complete" });

		// All SQLite data, schedules, and state are permanently deleted
		await this.destroy();
	}
}