# Set alert rules

Source: https://langbot.ai/docs/api/monitoring/set-alerts

`PUT /v1/bots/{bot_id}/alerts`

Alert on a missing heartbeat, a daily loss, drift from the test, or a halt, by email and a signed webhook. Members left out keep their value.

**Auth.** An account token (`Authorization: Bearer lb_…`) or a signed-in web session. A report-only token (`lbr_…`) is refused here with `403 scope_denied`.

**Limits.** Counts against your plan's API requests (60, 600 or 3,000 a minute on Free, Builder and Standard).

## Parameters

### Path parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `bot_id` | string | yes | The bot id (`bot_…`). |

### Body

| Name | Type | Required | Description |
|---|---|---|---|
| `heartbeat_missing_min` | integer | no | Alert when no heartbeat arrives for this many minutes; `null` turns it off. 1 to 1440. Default `5`. |
| `daily_loss_usd` | number | no | Alert when today's net P&L (since 00:00 UTC, marked) is at or below minus this many dollars; `null` turns it off. Up to 1,000,000,000. |
| `drift` | object | no | `{metric, threshold, min_fills}`: alert when the live value of `pnl_per_contract`, `fill_rate` or `fee_per_contract` differs from the test by more than `threshold`, once `min_fills` live fills exist; `null` turns it off. |
| `halted` | boolean | no | Alert when the bot reports a halt. Default `true`. |
| `email` | boolean | no | Send alerts to your account's email. Default `true`. |
| `webhook_url` | string | no | An https URL to POST alerts to; `null` removes it. |
| `rotate_secret` | boolean | no | Mint a new webhook signing secret. Default `false`. |

## Request

**curl**

```bash
curl -X PUT "https://api.langbot.ai/v1/bots/bot_01M6G72RFQRQ8JGNG8T1447GGP/alerts" \
  -H "Authorization: Bearer $LANGBOT_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"heartbeat_missing_min": 5, "daily_loss_usd": 50, "drift": {"metric": "pnl_per_contract", "threshold": 0.05, "min_fills": 30}, "webhook_url": "https://example.com/langbot-alerts"}'
```

**Python**

```python
from langbot import LangbotClient

async with LangbotClient() as lb:  # reads LANGBOT_API_TOKEN
    doc = await lb.bots.set_alerts("bot_01M6G72RFQRQ8JGNG8T1447GGP", heartbeat_missing_min=5, daily_loss_usd=50, webhook_url="https://example.com/langbot-alerts")
    secret = doc.get("webhook_secret")  # shown once
```

**TypeScript**

```ts
import { LangbotClient } from "@langbotai/sdk";

const lb = new LangbotClient(); // reads LANGBOT_API_TOKEN
const doc = await lb.bots.setAlerts("bot_01M6G72RFQRQ8JGNG8T1447GGP", { heartbeat_missing_min: 5, daily_loss_usd: 50 });
```

## Response

`200 OK`

```json
{
  "rules": {
    "heartbeat_missing_min": 5,
    "daily_loss_usd": 50.0,
    "drift": {
      "metric": "pnl_per_contract",
      "min_fills": 30,
      "threshold": 0.05
    },
    "halted": true
  },
  "channels": {
    "email": {
      "enabled": true,
      "to": "docs-1163406543@example.com"
    },
    "webhook": {
      "url": "https://example.com/langbot-alerts",
      "secret_set": true
    }
  },
  "incidents": [],
  "webhook_secret": "…"
}
```

`webhook_secret` is returned once, when a webhook URL is first set or `rotate_secret` is true. Each alert is one incident: notified once when it opens and once when it resolves, never repeated while it lasts. A webhook is a `POST` of `{"type": "bot.alert", "state": "open" | "resolved", "incident_id", "bot_id", "bot_name", "rule", "value", "threshold", "opened_at", "resolved_at", "ts"}` with `X-Langbot-Event: bot.alert` and `X-Langbot-Signature: sha256=<hex HMAC of the raw body with your secret>`, signed like every Langbot webhook.

## Errors

| Status | `code` | When |
|---|---|---|
| 404 | `not_found` | No bot with that id on your account (or it was deleted). |
| 401 | `auth_required` | No token was sent. |
| 401 | `token_invalid` | The token was not recognised (mistyped, revoked or expired). |
| 422 | `validation_error` | A parameter failed validation; `detail[].loc` names it. |
| 429 | `rate_limited` | Over your request budget; wait `Retry-After` seconds. |

Every error body is `{"detail": …, "code": "…"}`; branch on `code`. All codes: [Errors](https://langbot.ai/docs/api#errors).