# Cron Jobs

> Source: `src/content/docs/agent-os/cron.mdx`
> Canonical URL: https://rivet.dev/docs/agent-os/cron
> Description: Schedule recurring commands and agent sessions in agentOS VMs.

---
- **Cron expressions** for flexible scheduling (e.g. `"0 9 * * *"` for 9 AM daily)
- **Two action types**: `exec` for commands, `session` for agent sessions
- **Overlap modes**: `allow`, `skip`, or `queue` concurrent executions
- **Event streaming** via `cronEvent` for monitoring job execution

## Schedule a command

Run a shell command on a recurring schedule.

```ts @nocheck client.ts
import { createClient } from "rivetkit/client";
import type { registry } from "./server";

const client = createClient<typeof registry>("http://localhost:6420");
const agent = client.vm.getOrCreate(["my-agent"]);

// Schedule a cleanup script every hour
const { id } = await agent.scheduleCron({
  schedule: "0 * * * *",
  action: {
    type: "exec",
    command: "rm",
    args: ["-rf", "/tmp/cache/*"],
  },
});
console.log("Cron job ID:", id);
```

```ts @nocheck server.ts
import { agentOs } from "rivetkit/agent-os";
import { setup } from "rivetkit";
import common from "@rivet-dev/agent-os-common";
import pi from "@rivet-dev/agent-os-pi";

const vm = agentOs({
  options: { software: [common, pi] },
});

export const registry = setup({ use: { vm } });
registry.start();
```

## Schedule an agent session

Create a recurring agent session that runs a prompt on a schedule.

```ts @nocheck client.ts
import { createClient } from "rivetkit/client";
import type { registry } from "./server";

const client = createClient<typeof registry>("http://localhost:6420");
const agent = client.vm.getOrCreate(["my-agent"]);

// Run an agent every day at 9 AM to check for issues
await agent.scheduleCron({
  schedule: "0 9 * * *",
  action: {
    type: "session",
    agentType: "pi",
    prompt: "Review the logs in /home/user/logs/ and summarize any errors",
    options: { cwd: "/home/user" },
  },
});
```

```ts @nocheck server.ts
import { agentOs } from "rivetkit/agent-os";
import { setup } from "rivetkit";
import common from "@rivet-dev/agent-os-common";
import pi from "@rivet-dev/agent-os-pi";

const vm = agentOs({
  options: { software: [common, pi] },
});

export const registry = setup({ use: { vm } });
registry.start();
```

## Overlap modes

Control what happens when a cron job triggers while a previous execution is still running.

| Mode | Behavior |
|------|----------|
| `"skip"` | Skip this trigger if the previous run is still active |
| `"allow"` | Allow concurrent executions (default) |
| `"queue"` | Queue this trigger and run it after the previous one finishes |

```ts @nocheck client.ts
import { createClient } from "rivetkit/client";
import type { registry } from "./server";

const client = createClient<typeof registry>("http://localhost:6420");
const agent = client.vm.getOrCreate(["my-agent"]);

// Queue overlapping executions
await agent.scheduleCron({
  schedule: "*/5 * * * *",
  overlap: "queue",
  action: {
    type: "session",
    agentType: "pi",
    prompt: "Process the next batch of tasks",
  },
});
```

```ts @nocheck server.ts
import { agentOs } from "rivetkit/agent-os";
import { setup } from "rivetkit";
import common from "@rivet-dev/agent-os-common";
import pi from "@rivet-dev/agent-os-pi";

const vm = agentOs({
  options: { software: [common, pi] },
});

export const registry = setup({ use: { vm } });
registry.start();
```

## Monitor cron events

Subscribe to `cronEvent` to track job execution.

```ts @nocheck client.ts
import { createClient } from "rivetkit/client";
import type { registry } from "./server";

const client = createClient<typeof registry>("http://localhost:6420");
const agent = client.vm.getOrCreate(["my-agent"]);

agent.on("cronEvent", (data) => {
  console.log("Cron event:", data.event);
});

await agent.scheduleCron({
  schedule: "*/1 * * * *",
  action: { type: "exec", command: "echo", args: ["heartbeat"] },
});
```

```ts @nocheck server.ts
import { agentOs } from "rivetkit/agent-os";
import { setup } from "rivetkit";
import common from "@rivet-dev/agent-os-common";
import pi from "@rivet-dev/agent-os-pi";

const vm = agentOs({
  options: { software: [common, pi] },
});

export const registry = setup({ use: { vm } });
registry.start();
```

## List and cancel cron jobs

```ts @nocheck client.ts
import { createClient } from "rivetkit/client";
import type { registry } from "./server";

const client = createClient<typeof registry>("http://localhost:6420");
const agent = client.vm.getOrCreate(["my-agent"]);

// List all cron jobs
const jobs = await agent.listCronJobs();
for (const job of jobs) {
  console.log(job.id, job.schedule);
}

// Cancel a specific job
await agent.cancelCronJob(jobs[0].id);
```

```ts @nocheck server.ts
import { agentOs } from "rivetkit/agent-os";
import { setup } from "rivetkit";
import common from "@rivet-dev/agent-os-common";
import pi from "@rivet-dev/agent-os-pi";

const vm = agentOs({
  options: { software: [common, pi] },
});

export const registry = setup({ use: { vm } });
registry.start();
```

## Example: Heartbeat pattern

Schedule a recurring agent session to periodically check on a task. This is the core pattern behind [OpenClaw](https://openclaw.org), where an agent wakes up on a schedule to review progress, take action, and go back to sleep.

```ts @nocheck
await agent.scheduleCron({
  schedule: "*/30 * * * *",
  overlap: "skip",
  action: {
    type: "session",
    agentType: "pi",
    prompt: "Check the status of open issues and take any necessary action",
  },
});
```

The agent sleeps between executions and only consumes resources when the cron job fires.

## Recommendations

- Use `"skip"` overlap mode for most jobs. This prevents unbounded concurrency if a job takes longer than the interval. The default is `"allow"`.
- Use `"queue"` when every trigger must execute, even if they back up.
- Cron jobs keep the actor alive while executing. The actor can sleep between executions.
- Provide a custom `id` when scheduling to make it easier to manage and cancel jobs later.

_Source doc path: /docs/agent-os/cron_
