A guide for operating Tailscale or a self-hosted Headscale control server. Tailscale creates a private network between devices using WireGuard, while ACLs control which users, devices, or services can connect.

Use it to configure devices, authentication, access policies, subnet routers, exit nodes, relay servers, and device lifecycle settings.

It helps connect private machines without configuring every network manually and provides rules for limiting access. It also covers common infrastructure patterns such as routing access to subnets or using an exit node for internet traffic.

tailscale — Skill for Claude Code and Codex by magnus919

Install

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.

Any agent

npx skills add magnus919/hermes-profiles --skill tailscale

Clone the repo

git clone --depth 1 https://github.com/magnus919/hermes-profiles

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/magnus919/hermes-profiles/tailscale/github.svg)](https://agentmods.dev/skills/magnus919/hermes-profiles/tailscale)

Your own site

<a href="https://agentmods.dev/skills/magnus919/hermes-profiles/tailscale"><img src="https://agentmods.dev/badge/skills/magnus919/hermes-profiles/tailscale/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/magnus919/hermes-profiles/tailscale"><img src="https://agentmods.dev/badge/skills/magnus919/hermes-profiles/tailscale.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 30 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,213 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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 5.1	$0.00030	$0.01213
Opus 5	$0.00015	$0.00607
Sonnet 5	$0.00006	$0.00243
Haiku 4.5	$0.00003	$0.00121

Measured 9d ago against content hash e9b26170aa07, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

tailscale scanned grade A with 0 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 9d 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/tailscale/SKILL.md · 65 lines

How it starts

The opening of the file, as written. The whole thing — 65 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Tailscale

When to Load

Load this skill when the task involves setting up or managing a Tailscale tailnet — or a self-hosted Headscale instance — including ACL policies, subnet routing, exit nodes, DERP relay servers, and node lifecycle.

Core Concepts

Tailscale builds an overlay mesh network on top of WireGuard. Each node gets a unique Tailscale IP (100.x.x.x range) and communicates peer-to-peer via NAT traversal. The control server coordinates key exchange and ACL policy; data flows directly between nodes.

Node Lifecycle

Authentication: Web auth (device opens browser), pre-auth keys (ephemeral or reusable, scoped to tags), OIDC (SSO via Google, GitHub, Microsoft, any OIDC provider)
Tags: Device identity independent of user login — applied at auth time or via ACL. Used in ACL rules instead of user identity for servers, CI runners, infrastructure nodes
Expiry and cleanup: Nodes expire after [N] days by default (configurable). Expired nodes are removed from tailnet. Pre-auth keys can be reusable or single-use, with expiry

ACL Policy (huJSON)

Structure: { "acls": [...], "groups": {...}, "tags": [...], "hosts": {...}, "derpMap": {...}, "ssh": [...], "nodeAttrs": [...] }
ACL rules: { "action": "accept", "src": ["group:dev"], "dst": ["tag:prod-server:*"] } — src accepts connection to dst on given ports. Order independent; most specific policy wins.
Groups: Named user groups — "group:dev": ["[email protected]", "[email protected]"]. Referenced in ACL src/dst.
Tags vs groups: Tags identify devices (servers, CI runners). Groups identify users (developers, admins). ACL rules use both.
Deny rules: Explicit { "action": "deny" } rules with trailing refuse in dst — "*:refuse" blocks all ports. Deny overrides allow. Use for sensitive segments (prod-only database access, admin panels).
SSH: Tailscale SSH replaces SSH key management — { "action": "check", "src": [...], "dst": [...], "users": [...] } — ACL-enforced, logs all sessions, no keys to manage.

Read the full file on GitHub · 65 lines

Changes

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.

9d ago First seen · 65 lines · 30 tokens per session scan A e9b26170aa07

Subscribe to this mod's changes

tailscale is a skill published in the GitHub repository magnus919/hermes-profiles (152 stars, last pushed 2mo ago), licensed MIT. It adds 30 tokens to every session and 1,213 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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