---
title: Notifiers overview
description: Who gets pinged when an agent needs you. Six notifiers ship; pick one or stack several.
---

Notifiers deliver AO events — session stuck, PR opened, review requested, CI failed — to wherever you actually pay attention.

<PluginGrid>
  <PluginCard name="Desktop" logo="apple" href="/docs/plugins/notifiers/desktop" description="Native macOS/Linux notifications. No-op on Windows." />
  <PluginCard name="Discord" logo="discord" href="/docs/plugins/notifiers/discord" description="Discord webhook with rich embeds." />
  <PluginCard name="Slack" logo="slack" href="/docs/plugins/notifiers/slack" description="Slack incoming webhook." />
  <PluginCard name="Webhook" logo="webhook" href="/docs/plugins/notifiers/webhook" description="Generic HTTP POST. Retries + exponential backoff." />
  <PluginCard name="Composio" logo="composio" href="/docs/plugins/notifiers/composio" description="Route through Composio — Slack, Discord, or Gmail." />
  <PluginCard name="OpenClaw" logo="openclaw" href="/docs/plugins/notifiers/openclaw" description="Local OpenClaw gateway for personal alerts." />
</PluginGrid>

## Stacking notifiers

Notifier config is a list — pass as many as you want:

```yaml
notifier:
  - type: desktop
  - type: discord
    webhookUrl: ${DISCORD_URL}
  - type: slack
    webhookUrl: ${SLACK_URL}
    channel: "#agents"
```

Each notifier gets every event. AO doesn't try to dedupe across channels — that's your channel-configuration problem, not ours.

## Testing

```bash
ao doctor --test-notify
```

Sends a dummy notification through each configured notifier. Good way to verify your webhooks work before an agent needs to wake you at 3 AM.

## What gets notified

| Event | When |
|---|---|
| `session.spawned` | `ao spawn` succeeds |
| `session.working` | Agent is actively editing code |
| `pr.opened` | Agent pushed a branch and opened a PR |
| `ci.failed` | Required check fails |
| `review.requested` | Reviewer asks for changes |
| `session.mergeable` | CI green, no blockers |
| `session.merged` | PR merged |
| `session.blocked` | Agent is stuck — you need to intervene |

You can tune which events fire via [`reactions` config](/docs/configuration).