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 agentmods add skills/validatorsdao/slv/slv-firewallnpx skills add ValidatorsDAO/slv --skill slv-firewallgit clone --depth 1 https://github.com/ValidatorsDAO/slvWrote 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/validatorsdao/slv/slv-firewall)<a href="https://agentmods.dev/skills/validatorsdao/slv/slv-firewall"><img src="https://agentmods.dev/badge/skills/validatorsdao/slv/slv-firewall.svg" alt="Measured on agentmods" 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 | $0.00000 | $0.02234 |
| Opus 5 | $0.00000 | $0.01117 |
| Sonnet 5 | $0.00000 | $0.00447 |
| Haiku 4.5 | $0.00000 | $0.00223 |
Grade D, and why
slv-firewall scanned grade D with 3 findings 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 3d 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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
- `run_command: sudo nft list ruleset 2>/dev/null | head -3` — is nftables already configured? Reaches for credential fileshighPrivilege escalation
SSH keys, cloud credentials, git-credentials, .npmrc, /etc/shadow: reading these is how a config file becomes a credential leak.
> "Paste your SSH public key. It's a one-line string starting with `ssh-ed25519` or `ssh-rsa` — usually in `~/.ssh/id_ed25519.pub` on your laptop. Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
- `run_command: curl -s https://api.ipify.org` — THIS host's public IP (so you filter it out of whitelist candidates — no point whitelisting the server to itself). How it starts
The opening of the file, as written. The whole thing — 223 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SLV Firewall Skill
Lock down the SLV host's network perimeter: nftables default-drop, fail2ban for brute-force, SSH key-based login with password auth off. Non-engineer friendly — three commands, zero file editing.
Related: For phone/laptop VPN on top of this, see the
slv-wireguard skill. For automatic HTTPS on the chat UI, see
slv install nginx.
Use this skill when the user says anything like:
- "help me lock down the firewall / SSH"
- "is my box exposed? / what ports are open?"
- "allow only my IP" / "whitelist my laptop"
- "turn off SSH passwords" / "disable password login"
- "nftables" / "fail2ban" / "brute force"
EL's walkthrough (run in this order — skipping ahead locks users out)
Step 0 — Sanity probe (read-only, parallelizable)
Fire these in parallel so the rest of the conversation has real data to work with:
get_premium_vps_my_vps(MCP) — user's Premium VPS list.get_super_vps_my_vps(MCP) — Super VPS list.get_baremetal_status(MCP) — BareMetal list.run_command: curl -s https://api.ipify.org— THIS host's public IP (so you filter it out of whitelist candidates — no point whitelisting the server to itself).run_command: sudo nft list ruleset 2>/dev/null | head -3— is nftables already configured?run_command: systemctl is-active fail2ban 2>/dev/null— is fail2ban running?run_command: sudo grep -r PasswordAuthentication /etc/ssh/— is password auth still on?
Use the results to:
- Say what's already on / off.
- Build the whitelist candidate list: every
ipfrom the MCP VPS/BM calls that isn't THIS host's IP. Present to the user verbatim:"Your SLV account has these other hosts — want them whitelisted? You'll still be able to SSH between them after we lock down."
Step 1 — How will the user reach this box from outside?
Before collecting any --allow IPs, decide the remote-access
method with the user. This single question prevents the #1
support ticket (self-lockout from a rotating home IP).
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 3d ago First seen · 223 lines · 0 tokens per session scan D 084d14df4e7a
slv-firewall is a skill published in the GitHub repository ValidatorsDAO/slv (89 stars, last pushed 12d ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 2,234 tokens. A static security scan graded it D with 3 findings (asks for root, reaches for credential files, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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