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".
Best use case
castai-hello-world is best used when you need a repeatable AI agent workflow instead of a one-off prompt.
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".
Teams using castai-hello-world should expect a more consistent output, faster repeated execution, less prompt rewriting.
When to use this skill
- You want a reusable workflow that can be run more than once with consistent structure.
When not to use this skill
- You only need a quick one-off answer and do not need a reusable workflow.
- You cannot install or maintain the underlying files, dependencies, or repository context.
Installation
Claude Code / Cursor / Codex
Manual Installation
- Download SKILL.md from GitHub
- Place it in
.claude/skills/castai-hello-world/SKILL.mdinside your project - Restart your AI agent — it will auto-discover the skill
How castai-hello-world Compares
| Feature / Agent | castai-hello-world | Standard Approach |
|---|---|---|
| Platform Support | Not specified | Limited / Varies |
| Context Awareness | High | Baseline |
| Installation Complexity | Unknown | N/A |
Frequently Asked Questions
What does this skill do?
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".
Where can I find the source code?
You can find the source code on GitHub using the link provided at the top of the page.
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SKILL.md Source
# 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-auth` setup
- `CASTAI_API_KEY` environment variable set
- At least one cluster connected to CAST AI
## Instructions
### Step 1: List Connected Clusters
```bash
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:
```json
{
"id": "abc123-def456",
"name": "production-eks",
"status": "ready",
"providerType": "eks"
}
```
### Step 2: Get Cluster Savings Report
```bash
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
```bash
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
```bash
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
- [CAST AI API Reference](https://api.cast.ai/v1/spec/openapi.json)
- [CAST AI Console](https://console.cast.ai)
- [Savings Report Docs](https://docs.cast.ai/docs/getting-started)
## Next Steps
Proceed to `castai-local-dev-loop` to set up a development workflow.Related Skills
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