# Cobalt Core

> Cobalt Core infrastructure knowledge: KVM exporters, hypervisor tooling, OpenStack compute.

- **Type:** Skill
- **Install:** `agentstack add skill-notque-vexjoy-agent-cobalt-core`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [notque](https://agentstack.voostack.com/s/notque)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [notque](https://github.com/notque)
- **Source:** https://github.com/notque/vexjoy-agent/tree/main/skills/engineering/cobalt-core
- **Website:** https://vexjoy.com

## Install

```sh
agentstack add skill-notque-vexjoy-agent-cobalt-core
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Cobalt Core

Domain skill for the [cobaltcore-dev](https://github.com/cobaltcore-dev) project family — SAP Converged Cloud infrastructure components for KVM hypervisor management, metrics collection, and compute-node tooling.

## Reference Loading Table

| Signal | Reference | Size |
|--------|-----------|------|
| kvm-exporter, metrics, prometheus, libvirt, hypervisor, collector, scrape, steal time, NUMA, cgroups, cloud hypervisor | `references/kvm-exporter.md` | ~800 lines |
| goroutine, concurrency, semaphore, TryLock, sync.Map, race condition, socket exhaustion, scrape overlap, ClearScrapeCache | `references/concurrency-patterns.md` | ~200 lines |
| test, mock, moq, unit test, E2E, Kind cluster, race detector, interface_mock_gen, test-metrics.sh | `references/testing-patterns.md` | ~200 lines |

**Load greedily.** If the user's question touches any signal keyword, load the matching reference before responding. Multiple signals matching = load all matching references.

---

## Phase 1: IDENTIFY

Determine which cobaltcore component the user is asking about.

| Component | Repository | Reference |
|-----------|-----------|-----------|
| KVM Exporter | `cobaltcore-dev/kvm-exporter` | `references/kvm-exporter.md` |

If the component is not listed, tell the user no reference exists yet and offer to analyze the repo.

**Gate**: Component identified. Reference loaded. Proceed to Phase 2.

---

## Phase 2: RESPOND

Use loaded reference knowledge to answer the user's question. The references contain:
- Architecture and data flow diagrams
- Complete metric catalogs with types, labels, and descriptions
- Configuration options and environment variables
- Deployment models (Helm, DaemonSet, container specs)
- Code patterns (concurrency, caching, error handling)
- Testing strategies (unit mocks, E2E with Kind clusters)
- Alerting rules and operational concerns

For implementation questions involving Go code, pair with the `go-patterns` skill for language-specific patterns. For Prometheus/Grafana questions, pair with `prometheus-grafana-engineer`. For Kubernetes deployment questions, pair with `kubernetes-helm-engineer`.

**Gate**: Question answered with reference-backed specifics, not generic advice.

---

## Phase 3: EXTEND

When the user wants to add a new cobaltcore repo:
1. Analyze the repo systematically (README, go.mod, key source files, Dockerfile, Helm chart)
2. Create a new reference file at `references/{repo-name}.md`
3. Update the Reference Loading Table in this SKILL.md
4. Update the component table in Phase 1

Follow the structure established in `references/kvm-exporter.md` for consistency.

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [notque](https://github.com/notque)
- **Source:** [notque/vexjoy-agent](https://github.com/notque/vexjoy-agent)
- **License:** MIT
- **Homepage:** https://vexjoy.com

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-notque-vexjoy-agent-cobalt-core
- Seller: https://agentstack.voostack.com/s/notque
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.