domains-dns SKILL.md skillA
domains-dns from ericrisco/rsc-harness is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ericrisco/rsc-harness/domains-dns@git:20260729.9b4d66aPins git:20260729.9b4d66a in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ericrisco/rsc-harness
- Path
skills/domains-dns/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260729.9b4d66a, committed Jul 29, 2026
- First version recorded
- Jun 2, 2026
- Size
- 9,841 bytes
- Repository stars
- 236
- License
- MIT
Use when pointing a domain at a host or fixing broken HTTPS — delegating nameservers, writing A/AAAA/CNAME/ALIAS/MX/TXT/CAA rows, apex vs www, standing up auto-renewing TLS, and cutting nameservers over without downtime. NOT inbox placement or warmup (that is `email-deliverability`), NOT what runs behind the name (that is `deployment`).
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
# Domains & DNS You set up a name end to end: register or delegate it, write the records, and serve valid HTTPS. Almost every "my domain doesn't work" report is one of a handful of recurring mistakes. This skill names them and gives you paste-ready records plus the commands to prove they took. ## Resolution order is debug order A request resolves in one direction. Diagnose in the same direction, top-down, because the bug is almost always at the layer the user is *not* looking at. 1. **Name** — does the domain exist and is it registered/not expired? (`whois`) 2. **Delegation** — do the registrar's nameservers point at the DNS provider that actually holds the zone? (`dig NS`) 3. **Records** — does the authoritative zone return the right A/AAAA/CNAME/ALIAS/MX/TXT/CAA? (`dig @<authoritative-ns>`) 4. **TLS** — does the served chain validate and is it unexpired? (`openssl s_client`) Rule: never debug TLS before you've confirmed the record resolves to the box you think it does — a cert error is often a record pointing at the wrong host. Query authoritative nameservers, not your laptop's cache, or you'll chase a stale answer for an hour. ## Where the DNS lives …
Read the whole file at its exact version.
How to install
mdr add ericrisco/rsc-harness/domains-dns@sha256:d3367b3296f442acThe line at the top of this page pins the label git:20260729.9b4d66a, 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_seyimbinchx6apd6)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Jun 2, 2026 and Jul 29, 2026, about one every 57 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260729.9b4d66a latest | 2026-07-29 | 9b4d66a | 9,841 B | A | view · diff |
| git:20260602.004e38d | 2026-06-02 | 004e38d | 11,242 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 (9841 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
ericrisco/rsc-harness · 236 stars · license MIT · pushed 2026-10-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_seyimbinchx6apd6 GET https://markdownregistry.com/api/v1/resolve?ref=ericrisco/rsc-harness/domains-dns GET https://markdownregistry.com/api/v1/blob/d3367b3296f442acc9641820b4a25023734dab8c51958108e62af71e6c85c3b6
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.