ReddRadar
Agent skill
castai-hello-world
Query CAST AI cluster savings report and node inventory. Use when verifying CAST AI connectivity, viewing cluster cost savings, or listing managed nodes after onboarding. Trigger with phrases like "cast ai hello world", "cast ai savings", "cast ai cluster status", "test cast ai connection".
Install this agent skill to your Project
npx add-skill https://github.com/jeremylongshore/claude-code-plugins-plus-skills/tree/main/plugins/saas-packs/castai-pack/skills/castai-hello-world
SKILL.md
CAST AI Hello World
Overview
First API calls against the CAST AI REST API: list connected clusters, retrieve the savings report, and inspect node inventory. All examples use curl with the X-API-Key header -- no SDK required.
Prerequisites
- Completed
castai-install-authsetup CASTAI_API_KEYenvironment variable set- At least one cluster connected to CAST AI
Instructions
Step 1: List Connected Clusters
curl -s -H "X-API-Key: ${CASTAI_API_KEY}" \
https://api.cast.ai/v1/kubernetes/external-clusters \
| jq '.items[] | {id, name, status, providerType}'
Expected output:
{
"id": "abc123-def456",
"name": "production-eks",
"status": "ready",
"providerType": "eks"
}
Step 2: Get Cluster Savings Report
export CASTAI_CLUSTER_ID="your-cluster-id"
# Current month savings
curl -s -H "X-API-Key: ${CASTAI_API_KEY}" \
"https://api.cast.ai/v1/kubernetes/clusters/${CASTAI_CLUSTER_ID}/savings" \
| jq '{
monthlySavings: .monthlySavings,
savingsPercentage: .savingsPercentage,
currentCost: .currentMonthlyCost,
optimizedCost: .optimizedMonthlyCost
}'
Step 3: List Cluster Nodes
curl -s -H "X-API-Key: ${CASTAI_API_KEY}" \
"https://api.cast.ai/v1/kubernetes/external-clusters/${CASTAI_CLUSTER_ID}/nodes" \
| jq '.items[] | {
name: .name,
instanceType: .instanceType,
lifecycle: .lifecycle,
cpu: .allocatableCpu,
memory: .allocatableMemory,
zone: .zone
}'
Step 4: Check Autoscaler Policies
curl -s -H "X-API-Key: ${CASTAI_API_KEY}" \
"https://api.cast.ai/v1/kubernetes/clusters/${CASTAI_CLUSTER_ID}/policies" \
| jq '{
enabled: .enabled,
unschedulablePods: .unschedulablePods.enabled,
nodeDownscaler: .nodeDownscaler.enabled,
spotInstances: .spotInstances.enabled
}'
Output
- List of connected clusters with IDs and status
- Monthly savings report with before/after cost
- Node inventory with instance types and lifecycle (spot vs on-demand)
- Autoscaler policy status
Error Handling
| Error | Cause | Solution |
|---|---|---|
401 Unauthorized |
Bad API key | Regenerate at console.cast.ai |
404 Not Found |
Wrong cluster ID | List clusters first to get correct ID |
Empty items array |
No clusters connected | Run castai-install-auth to onboard |
agentStatus: offline |
Agent not running | Check kubectl get pods -n castai-agent |
Resources
Next Steps
Proceed to castai-local-dev-loop to set up a development workflow.
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