aws-vpc-dns-investigation SKILL.md skillA
aws-vpc-dns-investigation from aws/tools-for-devops-agent is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add aws/tools-for-devops-agent/aws-vpc-dns-investigation@v1.0.1Pins v1.0.1 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- aws/tools-for-devops-agent
- Path
skills/aws-vpc-dns-investigation/SKILL.md- Versions recorded
- 3
- Latest version
- v1.0.1, committed Oct 21, 2026
- First version recorded
- Aug 11, 2026
- Size
- 8,119 bytes
- Repository stars
- 137
- License
- Apache-2.0
Use this skill when a name is not resolving as expected inside a VPC, or before applying a DNS control-plane change. Activate on symptoms such as NXDOMAIN or SERVFAIL from an EC2 instance, a hostname resolving to a public address when a private endpoint was expected, an AWS service endpoint that stopped resolving after a VPC endpoint or Route 53 change, an application reaching the wrong IP, resolution that works from one instance but not another, IPv6 or dualstack resolution differences, a…
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
# Investigate VPC DNS Resolution Use the tools on the connected `aws-vpc-dns-diagnostics` MCP server. ## Step 1: Classify the request as Mode A or Mode B Before calling any tool, determine which mode applies: - **Mode A (live diagnosis):** The operator reports a resolution symptom from a running instance. They provide an instance ID (or you can identify one). The goal is to observe what actually resolves and compare resolvers. - **Mode B (pre-change validation):** The operator asks whether a proposed DNS change is safe. They provide account, region, VPC, and a change descriptor. No instance is required. If the request is ambiguous, ask the operator to clarify. Do not default to Mode A when the input lacks an instance ID, and do not default to Mode B when the operator describes a live symptom. ## Step 2: Load safety rules Regardless of mode, call `get_sop` with slug `A-critical-safety-rules` and follow every rule it contains. These are non-negotiable constraints on how you interpret results, handle opaque constructs, and report findings. --- ## Mode A route: live diagnosis ### Required inputs account_id, region, instance_id, and the failing DNS name. …
Read the whole file at its exact version.
How to install
mdr add aws/tools-for-devops-agent/aws-vpc-dns-investigation@sha256:9ed899014513a7d6The line at the top of this page pins the label v1.0.1, 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_rdjqcurrpklu4bbv)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Aug 11, 2026 and Oct 21, 2026, about one every 36 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0.1 latest | 2026-10-21 | 35b9537 | 8,119 B | A | view · diff |
| v1.0.0 | 2026-08-11 | 1a74807 | 8,125 B | A | view · diff |
| v1.0.0 | 2026-08-11 | bd445ad | 5,379 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 (8119 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
aws/tools-for-devops-agent · 137 stars · license Apache-2.0 · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_rdjqcurrpklu4bbv GET https://markdownregistry.com/api/v1/resolve?ref=aws/tools-for-devops-agent/aws-vpc-dns-investigation GET https://markdownregistry.com/api/v1/blob/9ed899014513a7d617944d511abf497fbdbd110f8035b51f03d5ca57ad8f2a73
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.