Wildcard Proxy

What it does

When your agent uses it

• The user says set up the wildcard proxy
• Port routing on this server
• Configure caddy so ports get subdomains
• Add a short name for port N

Example prompts

• “set up the wildcard proxy”
• “port routing on this server”
• “configure caddy so ports get subdomains”
• “/wildcard-proxy”

Requirements

• Python 3

Workflow steps

6 steps, taken from the first numbered list in SKILL.md.

1. 1Caddy v2 installed and running as a systemd service: caddy version, systemctl is-active caddy.
2. 2Wildcard DNS: *.{{DOMAIN}} resolves to this server. Check with a label nobody has used: dig +short zq.{{DOMAIN}} should print the server's…
3. 3Ports 80 and 443 reachable from the internet and not held by another server: sudo ss -tlnp '( sport = :80 or sport = :443 )'.
4. 4No other on_demand_tls block in /etc/caddy/Caddyfile. Caddy allows one ask endpoint. If one exists, stop and ask the user. Merging two…
5. 5ASK_PORT free: ss -tln | grep ':{{ASK_PORT}} ' prints nothing, or only Caddy itself when migrating an older version of this config.
6. 6Nothing private already listening on a routable port. After install, anything bound to loopback on a routed port is public. Before…

What it can do on your machine

Read from SKILL.md and the folder at commit 8a20283. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • curl
  • python3

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md. Its commands use curl, which can reach the network depending on how they are called.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Wildcard Proxy loads about 2k tokens when it runs, and up to ~2.5k if it reads all its reference files. Until then it costs about 123 tokens; SKILL.md has 884 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~123

When it runs · the whole SKILL.md, loaded when a task matches

~2k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~2.5k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

• NoteRuns commands with sudoSKILL.md:39

  nternet and not held by another server: `sudo ss -tlnp '( sport = :80 or sport = :443 )'`.

• NoteRuns commands with sudoSKILL.md:57

  sudo cp /etc/caddy/Caddyfile /etc/caddy/Caddyfile.bak-$(date +%F)

• NoteRuns commands with sudoSKILL.md:75

  sudo install -m 644 /tmp/wildcard-proxy.caddy /etc/caddy/wildcard-proxy.caddy

• NoteRuns commands with sudoSKILL.md:76

  sudo cp -n wildcard-proxy.names /etc/caddy/wildcard-proxy.names

• NoteRuns commands with sudoSKILL.md:96

  sudo caddy validate --config /etc/caddy/Caddyfile --adapter caddyfile

• NoteRuns commands with sudoSKILL.md:100

  sudo systemctl reload caddy

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from koolamusic/claudefiles at commit 8a20283, republished under its MIT licence (© koolamusic). 884 words, ~1,956 tokens.

name

wildcard-proxy

description

Set up Caddy on a server so any local port is reachable at https://<port>.<domain>/, and two-letter or named labels like https://ui.<domain>/ map to ports too, with certificates issued on demand and gated so only routed hostnames get one. Use when the user says 'set up the wildcard proxy', 'port routing on this server', 'configure caddy so ports get subdomains', 'add a short name for port N', 'what port is ab', or is preparing a new server to expose local services by port.

sudo cp /etc/caddy/Caddyfile /etc/caddy/Caddyfile.bak-$(date +%F)

DOMAIN=host.example.net
DOMAIN_RE=$(printf '%s' "$DOMAIN" | sed 's/\./\\\\./g')
sed -e "s/{{DOMAIN}}/$DOMAIN/g" -e "s/{{DOMAIN_RE}}/$DOMAIN_RE/g" \
    -e 's/{{PORT_RE}}/40[0-9][0-9]|80[0-9][0-9]/g' -e 's/{{ASK_PORT}}/5555/g' \
    wildcard-proxy.caddy > /tmp/wildcard-proxy.caddy

sudo install -m 644 /tmp/wildcard-proxy.caddy /etc/caddy/wildcard-proxy.caddy
sudo cp -n wildcard-proxy.names /etc/caddy/wildcard-proxy.names

{
	on_demand_tls {
		ask http://127.0.0.1:5555/ask
	}
}

import wildcard-proxy.caddy

sudo caddy validate --config /etc/caddy/Caddyfile --adapter caddyfile

sudo systemctl reload caddy

for l in 4012 ab zz 3000 abc; do printf '%s %s\n' $l "$(curl -s -o /dev/null -w '%{http_code}' "http://127.0.0.1:5555/ask?domain=$l.$DOMAIN")"; done

python3 -m http.server 4012 --bind 127.0.0.1

curl -s -o /dev/null -w '%{http_code}\n' https://4012.$DOMAIN/

© koolamusic, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 2 other files (references) in skills/wildcard-proxy of koolamusic/claudefiles.

• SKILL.md
• references/wildcard-proxy.caddy
• references/wildcard-proxy.names

Open the folder on GitHubat commit 8a20283