Shadowvpn Deploy Server

What it does

When your agent uses it

• The user wants to set up
• Run the shadowvpn-server on a host (VPS
• Enable internet egress for tunneled clients (IP forwarding + NAT/MASQUERADE)
• Wire up the systemd unit

Example prompts

• “/shadowvpn-deploy-server”

Requirements

• Docker

Workflow steps

5 steps, taken from the step headings in SKILL.md.

1. 1Build the binary for the target
2. 2Write server.json
3. 3Install + enable (systemd)
4. 4Open the UDP port
5. 5Verify

What it can do on your machine

Read from SKILL.md and the folder at commit 1eb9a0d. 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:

  • cargo
  • curl

  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

Shadowvpn Deploy Server loads about 1.5k tokens when it runs. Until then it costs about 105 tokens; SKILL.md has 531 words of instructions outside code blocks.

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

~105

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

~1.5k

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:67

  sudo install -Dm755 target/release/shadowvpn-server /usr/local/bin/shadowvpn-server

• NoteRuns commands with sudoSKILL.md:68

  sudo install -Dm600 server.json /etc/shadowvpn/server.json

• NoteRuns commands with sudoSKILL.md:69

  sudo cp dist/systemd/shadowvpn-server.service /etc/systemd/system/

• NoteRuns commands with sudoSKILL.md:70

  sudo systemctl daemon-reload && sudo systemctl enable --now shadowvpn-server

• NoteRuns commands with sudoSKILL.md:80

  After editing: `sudo systemctl daemon-reload && sudo systemctl restart shadowvpn-server`.

• NoteRuns commands with sudoSKILL.md:87

  sudo ufw allow 8388/udp          # or nftables/iptables equivalent

• NoteRuns commands with sudoSKILL.md:104

  sudo sysctl -w net.ipv4.ip_forward=1                                   # persist in /etc/sysctl.d/

• NoteRuns commands with sudoSKILL.md:106

  sudo iptables -t nat -A POSTROUTING -s 10.9.0.0/24 -o "$WAN" -j MASQUERADE

• NoteRuns commands with sudoSKILL.md:107

  sudo iptables -A FORWARD -s 10.9.0.0/24 -j ACCEPT

• NoteRuns commands with sudoSKILL.md:108

  sudo iptables -A FORWARD -d 10.9.0.0/24 -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT

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 madeye/shadowvpn at commit 1eb9a0d, republished under its MIT licence (© madeye). 531 words, ~1,460 tokens.

name

shadowvpn-deploy-server

description

Deploy, install, and run the ShadowVPN server in a target environment (Linux/systemd). Use when the user wants to set up, install, deploy, cross-build, or run the shadowvpn-server on a host (VPS, droplet, Raspberry Pi), enable internet egress for tunneled clients (IP forwarding + NAT/MASQUERADE), wire up the systemd unit, open the UDP port, or troubleshoot a server that clients cannot reach.

cargo build --release --bin shadowvpn-server   # -> target/release/shadowvpn-server
cargo test --lib                               # optional sanity check

# x86_64 Ubuntu/Debian server (glibc 2.39 = Ubuntu 24.04; use 2.31 for older)
cargo zigbuild --release --target x86_64-unknown-linux-gnu.2.39 --bin shadowvpn-server
# aarch64 (Raspberry Pi etc.)
cargo zigbuild --release --target aarch64-unknown-linux-gnu.2.31 --bin shadowvpn-server

{
  "server": "0.0.0.0:8388",
  "password": "correct horse battery staple",
  "cipher": "chacha20-poly1305",
  "tun_ip": "10.9.0.1",
  "tun_netmask": "255.255.255.0",
  "peer_ip": "10.9.0.2",
  "mtu": 1400,
  "obfs": "quic",
  "nat": true
}

sudo install -Dm755 target/release/shadowvpn-server /usr/local/bin/shadowvpn-server
sudo install -Dm600 server.json /etc/shadowvpn/server.json
sudo cp dist/systemd/shadowvpn-server.service /etc/systemd/system/
sudo systemctl daemon-reload && sudo systemctl enable --now shadowvpn-server

sudo ufw allow 8388/udp          # or nftables/iptables equivalent

journalctl -u shadowvpn-server -f          # startup log; NAT line shows "NAT : ENABLED" when "nat": true
ss -lunp | grep 8388                        # socket bound

sudo sysctl -w net.ipv4.ip_forward=1                                   # persist in /etc/sysctl.d/
WAN=$(ip route get 1.1.1.1 | grep -oP 'dev \K\S+')
sudo iptables -t nat -A POSTROUTING -s 10.9.0.0/24 -o "$WAN" -j MASQUERADE
sudo iptables -A FORWARD -s 10.9.0.0/24 -j ACCEPT
sudo iptables -A FORWARD -d 10.9.0.0/24 -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT

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

Files

Just SKILL.md in .claude/skills/shadowvpn-deploy-server of madeye/shadowvpn.

Open the folder on GitHubat commit 1eb9a0d