From castai-pack
Configures CAST AI webhooks for Kubernetes cluster events like node scaling, cost thresholds, and audit logs. Integrates with Slack, PagerDuty, or custom HTTP endpoints.
How this skill is triggered — by the user, by Claude, or both
Slash command
/castai-pack:castai-webhooks-eventsThis skill is limited to the following tools:
The summary Claude sees in its skill listing — used to decide when to auto-load this skill
CAST AI emits events for node lifecycle changes, autoscaler decisions, and security findings. Configure webhook endpoints or use the audit log API to track all cluster operations. Integrates with Slack, PagerDuty, and custom HTTP endpoints.
CAST AI emits events for node lifecycle changes, autoscaler decisions, and security findings. Configure webhook endpoints or use the audit log API to track all cluster operations. Integrates with Slack, PagerDuty, and custom HTTP endpoints.
Navigate to console.cast.ai > your cluster > Notifications. Available channels:
# Get recent cluster operations
curl -s -H "X-API-Key: ${CASTAI_API_KEY}" \
"https://api.cast.ai/v1/kubernetes/clusters/${CASTAI_CLUSTER_ID}/audit-log?limit=20" \
| jq '.items[] | {
time: .createdAt,
action: .action,
initiator: .initiatedBy,
details: .details
}'
// castai-webhook-handler.ts
import express from "express";
const app = express();
app.use(express.json());
interface CastAIEvent {
eventType: string;
clusterId: string;
clusterName: string;
timestamp: string;
data: {
nodeName?: string;
instanceType?: string;
lifecycle?: string;
action?: string;
savingsImpact?: number;
};
}
app.post("/castai/events", async (req, res) => {
const event: CastAIEvent = req.body;
switch (event.eventType) {
case "node.added":
console.log(
`Node added: ${event.data.nodeName} (${event.data.instanceType}, ${event.data.lifecycle})`
);
await notifySlack(
`New ${event.data.lifecycle} node: ${event.data.instanceType}`
);
break;
case "node.removed":
console.log(`Node removed: ${event.data.nodeName}`);
break;
case "node.spot_interrupted":
console.log(`Spot interruption: ${event.data.nodeName}`);
await notifyPagerDuty("Spot instance interrupted", event);
break;
case "savings.threshold":
console.log(`Savings threshold crossed: ${event.data.savingsImpact}%`);
break;
default:
console.log(`Unhandled event: ${event.eventType}`);
}
res.status(200).json({ received: true });
});
async function notifySlack(message: string): Promise<void> {
await fetch(process.env.SLACK_WEBHOOK_URL!, {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify({
text: `:kubernetes: CAST AI: ${message}`,
}),
});
}
app.listen(3000, () => console.log("CAST AI webhook handler on :3000"));
# Watch CAST AI events in the cluster
kubectl get events -n castai-agent --watch \
--field-selector=source=castai
# Or use a CronJob to post daily summaries
apiVersion: batch/v1
kind: CronJob
metadata:
name: castai-daily-summary
spec:
schedule: "0 9 * * *"
jobTemplate:
spec:
template:
spec:
containers:
- name: summary
image: curlimages/curl
command:
- sh
- -c
- |
SAVINGS=$(curl -s -H "X-API-Key: ${CASTAI_API_KEY}" \
"https://api.cast.ai/v1/kubernetes/clusters/${CLUSTER_ID}/savings")
curl -X POST ${SLACK_WEBHOOK_URL} \
-H "Content-Type: application/json" \
-d "{\"text\": \"Daily CAST AI savings: $(echo $SAVINGS | jq -r '.monthlySavings') USD/month\"}"
restartPolicy: Never
| Issue | Cause | Solution |
|---|---|---|
| Webhook not firing | Wrong URL in console | Verify endpoint is reachable |
| Slack message empty | Payload format changed | Check current event schema |
| Duplicate events | No idempotency | Track event IDs in your handler |
| Events delayed | Queue backlog | Monitor CAST AI status page |
For performance optimization, see castai-performance-tuning.
npx claudepluginhub jeremylongshore/claude-code-plugins-plus-skills --plugin castai-packQueries CAST AI API for Kubernetes cluster savings, node inventory, and policies via curl. Verifies connectivity and cost optimization after onboarding.
Plans and configures production-ready AKS clusters covering Day-0 decisions, SKU selection, networking, security, and operations like autoscaling and upgrades.
Guides on Azure Kubernetes Service (AKS) Automatic mode GA 2025: Karpenter autoscaling, HPA/VPA/KEDA, workload identity, networking, billing model, and cluster creation via az CLI.