Networking Agent Skill

Write and review network configuration for self-hosted Linux infrastructure: what an nftables ruleset, a resolver zone, a reverse-proxy…

Context cost
35.1k tokensestimated from the bundle, loaded when it triggers
Bundle
16 files · 140.4 kBtext throughout, nothing executable
Licence
MITthe author’s own terms
Last change
—no release on file
Servers it uses
Noneruns standalone

What it does

Write and review network configuration for self-hosted Linux infrastructure: what an nftables ruleset, a resolver zone, a reverse-proxy site, a forward-auth chain, a WireGuard or Tailscale tunnel, or an IDS rule does once loaded, where that differs from what the file reads. Not how a change is applied or verified.

What this skill changes about the agent has not been set out here as a list. Its SKILL.md, shown below, says it in the author’s own words.

cloud
Filed under

Cloud & DevOps

The skill itself

A skill is instructions the model reads, so you can see what you are getting: below is the start of its SKILL.md. The front matter loads with every session, the body loads when the skill triggers, and the whole file comes with the install.

SKILL.md17.8 kB · preview
--- name: networking when_to_use: >- Invoke whenever network configuration is touched at all — writing or reviewing an nftables, firewalld, ufw, OPNsense, or pfSense ruleset, a VLAN, bridge, route, or sysctl, an Unbound, Pi-hole, AdGuard Home, dnsmasq, or systemd-resolved config, a Caddyfile, a Traefik or nginx config, an ACME or TLS setting, an Authelia or authentik integration, a WireGuard, Tailscale, Headscale, or cloudflared config, or a Suricata, CrowdSec, or fail2ban setup. Also invoke on the symptoms: a rule that loads clean and filters nothing, a published Docker port reachable through a denying firewall, an internal name that resolves to its public address or to NXDOMAIN, a proxy that logs the CDN's address or trusts a client-supplied identity header, a tunnel with a fresh handshake and no traffic, a banned IP that stays connected, or an IDS that alerts and drops nothing. Covers what the artifact does; applying it and proving its effect belongs to devops, container networking modes to containers, the hypervisor bridge to proxmox. compatibility: Uses Claude Code frontmatter beyond the Agent Skills spec (when_to_use) ---
20Three biases decide most calls:
21
22- **Evaluation order belongs to the engine, not the file.** nftables runs every base chain on a hook by priority and
23 only drop is final; Caddy sorts directives by a built-in table; nginx discards inherited proxy_set_header the
24 moment one is set lower; Traefik ranks routers by rule length; Authelia and cloudflared take the first match. Read the
25 engine's order before trusting the file's.
26- **Who is trusted is a list, and every tool ships a different one.** Caddy trusts no proxy for X-Forwarded-*, HAProxy
27 and Cloudflare append the client's, Unbound refuses every client but localhost, AdGuard Home on 0.0.0.0 answers the
28 internet, Avahi reflects to every interface, Tailscale on Linux accepts no routes, NetBird pushes them unapproved.
29 Name the list in the config; never assume its direction.
30- **Every filter has a second path around it.** IPv6 beside an ip rule in an inet table; a published container port
31 beside the host input chain; a flowtable beside the later hooks; a reachable origin beside Cloudflare Access; an
32 established connection beside a CrowdSec ban; a default-bridge container beside the LAN resolver. Close the second
33 path or state that it is open.
34
35## Filtering
36
37- **accept ends only the current base chain; drop ends the ruleset.** A permissive table added beside the one
38 Proxmox, Docker, or firewalld installs loads clean and changes nothing. A nat chain at priority -200 or below runs
This is a preview of SKILL.md. Download or install the skill to get the whole thing.
In the file
SKILL.md2,609 words
Files16
LicenceMIT
Why you can read it

Nothing in a skill executes. The client loads the text and the model follows it, so a skill can be audited the way a runbook is — by reading it.

What it costs in context

Skills are not billed by the call. They are paid for in context: every token the instructions occupy is a token your code, your diff and your conversation cannot use. Here is what this one takes and when it takes it.

≈380
always loaded
The name and description, so the model knows the skill exists and when to reach for it.
34,720
on trigger
The instruction body and 15 supporting files, read only when the skill fires.
17.5%
of a 200k window
Ten skills this size would not fit in the window together.
050k100k150k200k context window

35.1k tokens, estimated from the bundle at four bytes to the token, held for the rest of the session once it triggers. Heavy. Teams tend to install this one per project rather than globally, and load it only when the job comes up.

Servers bill, skills cost

A server charges by the month. A skill charges once per session, in context, and then keeps charging it for as long as the session lives.

Before and after

The same question, put to the same model twice: once as it comes, and once with these instructions loaded.

No worked example has been published for this skill yet.

The procedure it runs

The procedure has not been set out here step by step. It is in the body of its SKILL.md: the start of it is shown above, and the whole file comes with the install.

Prose, not code

These steps are written for a model to follow, not executed by a runtime. It can still be told to skip one, and it will say so when it does.

Servers it uses

None. This skill calls no MCP servers at all.

Everything it needs is in the instructions, so it works in a project with nothing connected — the model reads the file and changes how it works with what it can already reach.

Its SKILL.md does not declare which tools it asks the agent for, so what it touches is whatever the instructions themselves ask for — read them before you install it.

What it asks for
Writes filesnot declared
Network accessnot declared

This SKILL.md carries no allowed-tools line, so neither is declared. A skill grants no permissions of its own — it can only ask for tools your client already has.

What it will not do

Every skill is narrow, and the useful ones say where they stop. These are the jobs this one is the wrong tool for.

What this skill is not for has not been published here. Nothing is implied by that: it is a section the author has not filled in.

What is in the bundle

16 files, 140.4 kB on disk. A bundle is text throughout: the instructions the model reads, plus the templates it fills in.

  • SKILL.md17.8 kB
  • .dev/reference-inventory.json33.2 kB
  • references/acme.md4.3 kB
  • references/caddy.md5.6 kB
  • references/cloudflare.md5.0 kB
  • references/dns.md6.0 kB
  • references/filtering.md8.4 kB
What is not in it

No dependencies and nothing executable: a skill is text the agent reads, so the bundle is 16 files you can review in full before installing. The MIT licence covers the templates and examples as well as the instructions.

Install

Installing copies the bundle into your project. Nothing runs at install time — the files sit on disk until the model reads them.

# Networking · 35.1k tokens when loaded · macOS, Linux mkdir -p .claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/xobotyi-networking/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/networking" ] && { [ ! -e .claude/skills/networking ] || { mv .claude/skills/networking "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/networking" .claude/skills/ && echo "Installed .claude/skills/networking"
On Windows, or any OS with Node 20+
npx mcprush@latest skill add xobotyi/networking

Windows PowerShell says 'running scripts is disabled on this system'? Run Set-ExecutionPolicy -Scope CurrentUser RemoteSigned once, or type npx.cmd instead of npx (codex.cmd, gemini.cmd, grok.cmd likewise). PowerShell 7 needs neither. Writes to .claude/skills/networking/ in the current project. For every project instead, run mkdir -p ~/.claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/xobotyi-networking/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/networking" ] && { [ ! -e ~/.claude/skills/networking ] || { mv ~/.claude/skills/networking "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/networking" ~/.claude/skills/ && echo "Installed ~/.claude/skills/networking" (macOS, Linux) — or add --global to the npx line. The curl line replaces .claude/skills/networking/ only after the download succeeds, so files left there by another skill of the same name, or by an older release, do not mix in. A copy already there is moved aside, not deleted, and the line prints where.

Which clients pick it up on their own

A skill is a folder of text. Most of these read a skills folder and pick it up without being told; the rest take the same folder another way — an upload in the app, a parameter on an API call — and then choose it by its description just the same.

Claude Code.claude/skills/
Claude DesktopCustomize › Skills
ChatGPTSkills › Create › Upload
Cursor.cursor/skills/
VS Code.github/skills/
Codex CLI.agents/skills/
Gemini CLI.gemini/skills/
Grok Build.grok/skills/
Microsoft CopilotSkills › Upload a skill
PerplexityComputer › Skills › Upload a skill
DeepSeek Harness.dsh/skills/
Zed.agents/skills/
Devin Desktop.devin/skills/
Windsurf (legacy).windsurf/skills/
OpenAI Agents SDKInstructions or sandbox Skills
HTTP / APIa request parameter
This release
Versionnot versioned
Publishedno release date on file
PriceFree
Referencexobotyi/networking

Versions

Its author publishes no version number, so there is nothing here to pin to: what you install is the folder as it stands today. Instructions change more often than APIs do — a skill can be rewritten entirely without anything it depends on moving.

Pinning

Nothing to pin to: this skill carries no version number of its own. What you install is what the folder holds on the day you install it.

Reviews

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Anybody with an account, one review each. It carries the version that was current when you wrote it, and the publisher may reply once.

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