headscale-derp SKILL.md skillA
headscale-derp from magnus919/agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add magnus919/agent-skills/headscale-derp@git:20260814.0a7c6b9Pins git:20260814.0a7c6b9 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- magnus919/agent-skills
- Path
tailscale/skills/headscale-derp/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260814.0a7c6b9, committed Aug 14, 2026
- First version recorded
- Aug 14, 2026
- Size
- 5,771 bytes
- Repository stars
- 166
- License
- MIT
Configure and manage DERP relay servers for Tailscale/Headscale — embedded.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# headscale-derp Skill
## Overview
**DERP** = **D**esignated **E**ncrypted **R**elay **P**rotocol. DERP is Tailscale's TURN-like fallback mechanism used when direct peer-to-peer NAT traversal fails. Traffic through DERP is fully encrypted (WireGuard inside TLS), but it routes through a relay server rather than directly between peers, so it introduces additional latency.
Common scenarios where DERP is used:
- **Symmetric NAT** — Both peers behind symmetric NAT gateways
- **Corporate firewalls** — Restrictive egress policies that block UDP/STUN
- **Double NAT** — Carrier-grade NAT on both sides
- **Blocked STUN** — UDP port 3478 is filtered
## DERP in Headscale
Headscale includes an **embedded DERP server** that is enabled by default in the `config.yaml`:
```yaml
derp:
server:
enabled: true
region_id: 999
region_code: "headscale"
region_name: "Headscale Embedded DERP"
stun_listen_addr: "0.0.0.0:3478"
private_key_path: "/var/lib/headscale/derp_server_private.key"
```
The embedded server runs a STUN endpoint on port 3478 and relays on port 443 (or whatever port Headscale listens on). It's suitable for small tailnets (under ~50 nodes).
…Read the whole file at its exact version.
How to install
mdr add magnus919/agent-skills/headscale-derp@sha256:53a9fd2350287dc3The line at the top of this page pins the label git:20260814.0a7c6b9, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_iy7jqzx6v2jmyhnj)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, all committed on Aug 14, 2026.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260814.0a7c6b9 latest | 2026-08-14 | 0a7c6b9 | 5,771 B | A | view · diff |
| git:20260814.c0c7690 | 2026-08-14 | c0c7690 | 5,559 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (5771 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
magnus919/agent-skills · 166 stars · license MIT · pushed 2026-11-04 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_iy7jqzx6v2jmyhnj GET https://markdownregistry.com/api/v1/resolve?ref=magnus919/agent-skills/headscale-derp GET https://markdownregistry.com/api/v1/blob/53a9fd2350287dc3f4c6bdeedc6baaf74ae81ed41f9ab8cd870b6b1171eaddf1
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.