Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add monkilabs/opencastle --skill hetzner-cloudgit clone --depth 1 https://github.com/monkilabs/opencastleWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/monkilabs/opencastle/hetzner-cloud)<a href="https://agentmods.dev/skills/monkilabs/opencastle/hetzner-cloud"><img src="https://agentmods.dev/badge/skills/monkilabs/opencastle/hetzner-cloud/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/monkilabs/opencastle/hetzner-cloud"><img src="https://agentmods.dev/badge/skills/monkilabs/opencastle/hetzner-cloud.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00053 | $0.01835 |
| Opus 5.5 | $0.00021 | $0.00734 |
| Sonnet 5.5 | $0.00011 | $0.00367 |
| Haiku 4.5 | $0.00005 | $0.00184 |
Grade C, and why
hetzner-cloud scanned grade C with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Cloud metadata endpointhighServer-side request forgery
One request to 169.254.169.254 can return temporary IAM credentials.
- Metadata endpoint: `http://169.254.169.254/hetzner/v1/metadata` (useful in cloud-init to self-discover private IP). How it starts
The opening of the file, as written. The whole thing — 97 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Hetzner Cloud
Facts that drift (prices, SKUs, locations, limits) go stale — prefer retrieval over pre-training: hcloud server-type list -o json, hcloud location list, docs.hetzner.com. Everything below is behavior, not price sheets. If the project documents a topology (e.g. docs/architecture/), read it before provisioning anything.
Provisioning Workflow
- Pick type + location together — CAX (Ampere arm64, best RAM/€) exists only in EU DCs (fsn1/nbg1/hel1); verify with
hcloud server-type list. arm64 requires multi-arch container images end-to-end.- Checkpoint:
hcloud server-type describe <type>shows the target location.
- Checkpoint:
- Create network + firewall before servers — attach at create time; firewall via label selector (
role=web) scales better than per-server IDs.- Checkpoint: firewall rules list SSH restricted to admin IPs, never
0.0.0.0/0.
- Checkpoint: firewall rules list SSH restricted to admin IPs, never
- Create server with cloud-init user-data — runs once at first boot only.
- Recovery: broken cloud-init → don't patch by hand; fix the template,
server rebuild(keeps IPs) or replace via IaC.
- Recovery: broken cloud-init → don't patch by hand; fix the template,
- Attach volumes, then mount explicitly — see Volumes below.
- Checkpoint: mount survives reboot (
fstabentry, not justautomount).
- Checkpoint: mount survives reboot (
- Enable protection on stateful resources —
hcloud server enable-protection <s> delete rebuild+ same for volumes.- Gate: protection verified via
hcloud server describebefore real data lands.
- Gate: protection verified via
Non-Obvious Behaviors
Networking
- Cloud Firewalls filter ONLY the public interface. Private-network traffic is never touched by them — segment the private net with host firewalls (
ufw) or not at all. This is the most common Hetzner security misconception. - Private network MTU is 1450, not 1500 — override in Docker (
daemon.json"mtu": 1450) and any overlay/VPN on top, or suffer silent large-packet stalls. - Private networks are not encrypted — treat as shared fabric, keep TLS for sensitive cross-node traffic.
- Network zones (e.g.
eu-central= fsn1/nbg1/hel1) span DCs — cross-DC private traffic works and is free. - Floating IPs need manual OS config (netplan alias); primary IPs configure themselves. Floating IP ≠ instant failover without host-side automation.
- IPv4 primary IPs bill separately and survive server deletion unless
auto_deleteis set — orphaned IPs keep billing.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 11d ago Changed · -41 tokens per session 2161f55745cb
- 12d ago First seen · 97 lines · 94 tokens per session scan C e4ad8ae6865d
hetzner-cloud is a skill published in the GitHub repository monkilabs/opencastle (80 stars, last pushed yesterday), licensed MIT. It adds 53 tokens to every session and 1,835 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it C with 1 finding (cloud metadata endpoint). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-04.
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