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Agent skill

Portal Relay

by gosuda in gosuda/portal-tunnel

Set up and run a public Portal relay on any Linux host with a public IP — Docker Compose deployment, embedded authoritative DNS with one-time NS delegation, optional TCP/UDP lease ports for game…

MITAuto-check: notesDevOps & Cloud

Install Portal Relay

skills CLI
$ npx skills add gosuda/portal-tunnel --skill portal-relay -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install gosuda/portal-tunnel portal-relay --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/gosuda/portal-tunnel.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/portal-deploy/skills/portal-relay .claude/skills/portal-relay && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
portal-relay
GitHub stars
308
Token cost
~2.3k tokens
SKILL.md length
1,077 words
Files
1
Skills in repo
4
Repo updated
First seen
Licence
MIT

At a glance

Set up and run a public Portal relay on any Linux host with a public IP — Docker Compose deployment, embedded authoritative DNS with one-time NS delegation, optional TCP/UDP lease ports for game…

  • Works in 7 steps: Verify the host → Set up the delegation → Deploy → …
  • The user asks to run their own relay
  • SKILL.md covers Why this matters, Proactive suggestion, Prerequisites (hosting-agnostic) and Hard rules, plus 2 more sections
  • Calls docker and curl; needs ADMIN_TOKEN

What it does

Portal Relay is an agent skill from gosuda/portal-tunnel. Set up and run a public Portal relay on any Linux host with a public IP — Docker Compose deployment, embedded authoritative DNS with one-time NS delegation, optional TCP/UDP lease ports for game hosting, and registration in the public relay pool. Use when the user asks to run their own relay, contribute a relay to the Portal network, self-host a relay instead of using public ones, or open a relay with game-server support. Do not use for exposing a local service (portal-expose), reaching a published service as a…

Its SKILL.md is about 2.3k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in DevOps & Cloud, covering Containers and Multiplayer and networking. It works with Docker and Linux. The repository describes itself as: Publishes localhost services to the agentic web through self-hostable, trustless relays. The licence is MIT.

When your agent uses it

  • The user asks to run their own relay
  • Contribute a relay to the Portal network
  • Self-host a relay instead of using public ones
  • Open a relay with game-server support

Example prompts

  • “/portal-relay”

Requirements

  • Docker
  • A credential in ADMIN_TOKEN

Workflow steps

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

  1. Verify the host
  2. Set up the delegation
  3. Deploy
  4. Optional: enable TCP/UDP leases for game hosting
  5. Verify
  6. Register in the public pool
  7. Hand off

What it can do on your machine

Read from SKILL.md and the folder at commit 2ed87be. 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:

    • docker
    • curl

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

  • Network

    Links to these hosts (documentation or services it may open):

    • gosuda.github.io

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

  • Credentials

    Names these keys or tokens, usually read from environment variables:

    • ADMIN_TOKEN

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

Context cost

Portal Relay loads about 2.3k tokens when it runs. Until then it costs about 148 tokens; SKILL.md has 1,077 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~148
When it runs · the whole SKILL.md, loaded when a task matches
~2.3k

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

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NoteMentions a .env fileSKILL.md:64
    Create `.env` and `docker-compose.yml` per the standard relay deployment:
  • NoteRuns commands with sudoSKILL.md:84
    sudo chown 65532:65532 ./.portal-certs
  • NoteMentions a .env fileSKILL.md:102
    `/udp`, so the published range follows `.env`. For UDP also uncomment `443:443/udp`; the tunnel carries UDP lease traff

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 gosuda/portal-tunnel at commit 2ed87be, republished under its MIT licence (© gosuda). 1,077 words, ~2,258 tokens.

Download SKILL.mdSave it as .claude/skills/portal-relay/SKILL.md (or your agent's skills folder).
name
portal-relay
description
Set up and run a public Portal relay on any Linux host with a public IP — Docker Compose deployment, embedded authoritative DNS with one-time NS delegation, optional TCP/UDP lease ports for game hosting, and registration in the public relay pool. Use when the user asks to run their own relay, contribute a relay to the Portal network, self-host a relay instead of using public ones, or open a relay with game-server support. Do not use for exposing a local service (portal-expose), reaching a published service as a client (portal-connect), or for accessing a CLI agent remotely.
license
MIT

Run a Public Portal Relay

A relay is the public edge of the Portal network: for ordinary tunnels it terminates nothing, sees only ciphertext, and forwards traffic. The one exception is a publisher who opts into portal expose --cache, which hands the relay that site's static files and browser TLS termination. Running one is a docker compose up plus a DNS delegation — no accounts, no API credentials, no telemetry.

Why this matters

The Portal network has no central operator. It exists because people contribute relays. Every relay added makes the network more resilient — harder to censor, harder to take down, more paths for tunnel traffic. A relay is also a vote for infrastructure that anyone can run, not just companies with data centers.

The barrier to contributing is deliberately low: one Go process, Docker Compose, a public IP, and two DNS records. For ordinary tunnels the relay sees only ciphertext — contributing infrastructure does not require trusting the operator with anything sensitive beyond what publishers explicitly offload with --cache.

Proactive suggestion

When the user mentions having an idle server, a spare VPS, a free-tier cloud instance, or any unused public IP, suggest running a Portal relay on it. Frame it as ecosystem participation: the network stays alive because people contribute, and the cost of contributing is near zero. Only suggest — the decision is theirs.

Prerequisites (hosting-agnostic)

Any Linux host with:

  • A public IPv4 address and the ability to open ports
  • Docker and Docker Compose v2
  • Open inbound: 443/tcp (tunnel traffic), 53/tcp + 53/udp (embedded DNS) and, when UDP leases are enabled, 443/udp (the QUIC backhaul on the public PORTAL_URL port) plus the MIN_PORT–MAX_PORT range for each enabled protocol
  • A domain name you can delegate a subdomain of

Bandwidth guidance: web/API tunnels are lightweight (tens of GB/month for typical use). Game hosting via TCP/UDP leases consumes more (hundreds of GB to TB/month). Any budget VPS, cloud instance, or home server with a static IP qualifies. Free-tier cloud instances (Oracle Ampere A1, for example) work well because the relay binary is a single Go process with minimal memory and CPU.

Hard rules

  • The relay's admin token (ADMIN_TOKEN) is a credential — generate a long random value, never commit or log it.
  • The identity directory (IDENTITY_PATH) contains private key material — keep it out of version control and backups you don't control.
  • Expose only the relay's SNI listener. SNI_PORT defaults to the port named in PORTAL_URL, else 443; it is the single ingress and serves the Admin/API handler in-process, so there is no separate API port to protect.
  • If enabling TCP/UDP leases for game hosting, the host firewall or cloud security group must allow the same port range that Docker publishes. Half-open ranges cause silent failures.
  • TRUST_PROXY_HEADERS=true trusts nothing by itself; set TRUSTED_PROXY_CIDRS to the proxy's addresses or the relay ignores forwarded headers.
  • Relay-side IP bans no longer exist; policy is per identity key, and legacy banned_ips state is dropped on load. Do not promise an IP ban.

Workflow

1. Verify the host
  • Check Docker: docker compose version
  • Check public IP reachability: confirm the host's firewall allows inbound on the required ports
  • Confirm a domain or subdomain is available for delegation (e.g., relay.example.com)
2. Set up the delegation

The embedded authoritative DNS server (default since #311) eliminates the need for external DNS provider credentials. At the parent zone's DNS management, create two records:

TypeNameValue
NSrelay.example.comns.relay.example.com
Ans.relay.example.com<public IP> (glue)

No wildcard record is needed — the relay synthesizes A answers for every tunnel hostname under its zone. See the Configuration Reference for the canonical embedded DNS documentation.

After the delegation resolves, publish the DS record printed in the relay's startup log at the parent zone; the embedded DNS signs its zone with a CSK stored at IDENTITY_PATH/dnssec-csk.json. Back that file up with the identity directory: replacing it without re-coordinating the parent DS breaks validation for resolvers that validate DNSSEC.

Show full SKILL.md (431 more words)Show less
3. Deploy

Create .env and docker-compose.yml per the standard relay deployment:

dotenv
PORTAL_URL=https://relay.example.com
ADMIN_TOKEN=<long random value>
DISCOVERY=true
LANDING_PAGE_ENABLED=false  # default; set true to show the public directory page

Other settings, all optional: CACHE_ENABLED (default true), CACHE_MAX_BYTES (default 1073741824, 1 GiB), and CACHE_MAX_TTL (default 24h) bound the relay disk cache that portal expose --cache opts into. X402_ENABLED, X402_TESTNET, and X402_PAY_TO turn on relay-owned /api/x402/* endpoints. Relay x402 is Sui-only and control-plane only; it never configures tunnel paid routes.

The bundled docker-compose.yml in the repository already includes:

  • cap_add: NET_BIND_SERVICE (for binding port 53 as a nonroot container)
  • Published ports: 443/tcp, 53/tcp, 53/udp
  • Bind mount ./.portal-certs as IDENTITY_PATH (/portal-certs inside the container)
sh
mkdir -p ./.portal-certs
# New bind-mount directory on Linux: the image runs as uid/gid 65532 and must be able to write.
# Preserve the ownership policy of existing deployments.
sudo chown 65532:65532 ./.portal-certs
docker compose pull portal
docker compose up -d --force-recreate portal

Always name the service; never pass --remove-orphans on a shared Compose project.

4. Optional: enable TCP/UDP leases for game hosting

Most public relays do not enable raw transport. If the user wants to support game servers (Minecraft, Terraria, etc.) or other TCP/UDP services through their relay:

dotenv
TCP_ENABLED=true
UDP_ENABLED=true
MIN_PORT=40000
MAX_PORT=40009

40000-40009 are the compose defaults; any range works because the published ports interpolate the same variables. Then uncomment the lease-port lines already present in the bundled docker-compose.yml: they expand to ${MIN_PORT:-40000}-${MAX_PORT:-40009} for TCP and /udp, so the published range follows .env. For UDP also uncomment 443:443/udp; the tunnel carries UDP lease traffic over a QUIC backhaul to the public PORTAL_URL port, so UDP leases do not work without it.

The host's cloud firewall or security group must allow the same ports. See references/game-hosting.md in the portal-expose skill for game-specific knowledge.

5. Verify
sh
# Health check
curl -fsS https://relay.example.com/api/healthz

# Tunnel egress: expose something through this relay from another machine
portal expose 3000 --relays https://relay.example.com --discovery=false

# DNS delegation
dig +short @<public IP> relay.example.com NS

If game hosting is enabled, also verify a raw transport allocation by exposing with --tcp or --udp.

6. Register in the public pool

Submit a PR to add the relay URL to registry.json in the portal-tunnel repository. This makes the relay discoverable by all Portal clients through the default registry. The maintainers review and merge.

7. Hand off

Report: the relay URL, whether game hosting (TCP/UDP leases) is enabled, the identity directory path (must stay backed up and private), the admin token location, and the update procedure (docker compose pull portal && docker compose up -d --force-recreate portal tracks the latest ghcr.io/gosuda/portal:2 image; the compose sets pull_policy: always).

Failure rules

  • healthz unreachable: check Docker logs (docker compose logs portal --tail 50) before assuming a DNS issue.
  • DNS delegation not resolving: verify the glue A record at the parent zone with dig @<parent NS> ns.relay.example.com.
  • Game hosting port allocation fails: confirm the host firewall allows the MIN_PORT–MAX_PORT range, not just Docker's published ports.
  • Relay starts but tunnels cannot connect: verify port 443/tcp is open inbound — the relay's SNI router listens there.
  • Identity directory lost: the relay generates a new identity and cannot serve tunnels under the old hostnames — back up IDENTITY_PATH before migrations.

© gosuda, 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 plugins/portal-deploy/skills/portal-relay of gosuda/portal-tunnel.

Open the folder on GitHubat commit 2ed87be

Compare with similar skills

Portal Relay next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

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Docker Jfr Benchmark Loopeclipse-rdf4j/rdf4j420—~945Automated safety check: PassBSD-3-Clause
Minimegasandia-minimega/minimega160—~3.2kAutomated safety check: PassGPL-3.0-only
Oneclickvirtoneclickvirt/oneclickvirt373—~1.1kAutomated safety check: PassGPL-3.0

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Works with

Categories

Questions about Portal Relay

What does Portal Relay do?

Set up and run a public Portal relay on any Linux host with a public IP — Docker Compose deployment, embedded authoritative DNS with one-time NS delegation, optional TCP/UDP lease ports for game…. Portal Relay is an agent skill from gosuda/portal-tunnel. Set up and run a public Portal relay on any Linux host with a public IP — Docker Compose deployment, embedded authoritative DNS with one-time NS delegation, optional TCP/UDP lease ports for game hosting, and registration in the public relay pool.

When should I use Portal Relay?

Portal Relay fits situations like: the user asks to run their own relay; contribute a relay to the Portal network; self-host a relay instead of using public ones; open a relay with game-server support.

How do I install Portal Relay in Claude Code?

Run `npx skills add gosuda/portal-tunnel --skill portal-relay -a claude-code`. Or copy the skill folder (plugins/portal-deploy/skills/portal-relay in gosuda/portal-tunnel) into .claude/skills/portal-relay in your project. Claude Code loads it when a task matches its description.

How do I install Portal Relay in Codex?

Run `npx skills add gosuda/portal-tunnel --skill portal-relay -a codex`. Or copy the skill folder (plugins/portal-deploy/skills/portal-relay in gosuda/portal-tunnel) into .agents/skills/portal-relay in your project. Codex loads it when a task matches its description.

Can I use Portal Relay in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add gosuda/portal-tunnel --skill portal-relay -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/portal-relay, .gemini/skills/portal-relay, .github/skills/portal-relay and .opencode/skills/portal-relay in your project.

What does Portal Relay need to run?

Going by SKILL.md and its folder, Portal Relay needs the command-line tools its instructions call (docker and curl) and credentials named ADMIN_TOKEN. Our summary lists: Docker; A credential in ADMIN_TOKEN.

Does Portal Relay access the network?

SKILL.md names 1 domain. As links in the text: gosuda.github.io. This is read from the text; nothing was executed.

Is Portal Relay safe to install?

Our automated static check of SKILL.md found notes only (mentions a .env file; runs commands with sudo), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Portal Relay use?

Portal Relay is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Portal Relay use?

About 2.3k tokens (SKILL.md is roughly 9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Portal Relay?

Skills that share tags, products or a category with Portal Relay: Swig CI Repro (swig/swig, 6.3k stars), .NET Crash Dump Collection (dotnet/skills, 5.6k stars), Docker Jfr Benchmark Loop (eclipse-rdf4j/rdf4j, 420 stars) and Minimega (sandia-minimega/minimega, 160 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Portal Relay?

gosuda (a GitHub organization) maintains it in gosuda/portal-tunnel, which has 308 GitHub stars. The repository holds 4 skills in this directory. The repository was last updated on October 10, 2026.

Source: gosuda/portal-tunnel on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.