---
title: "Claude Skills for Cold Email Infrastructure"
description: "Free Claude skills that check whether a domain is burned, audit DNS before you send, split a list by email provider, and size a mailbox order. No API key."
url: https://warminboxes.com/skills
breadcrumb: "Home > Claude Skills"
---
# Claude Skills for Cold Email Infrastructure

Install one and ask in plain language. Claude runs the checks, reads the result and tells you what to change, rather than describing how you might go and do it.

Each skill is a single file calling the same free API behind the [free deliverability tools](https://warminboxes.com/deliverability-tools). No API key, no signup, and every verdict cites the check it came from.

[The skills on GitHub →](https://github.com/Huz-ai-fa/warminboxes-claude-skills)

## The skills

One page each, because each answers a different question.

- [Inbox Checker](https://warminboxes.com/skills/inbox-checker) — Is this domain burned?

- [Domain Audit](https://warminboxes.com/skills/domain-audit) — Is this domain set up correctly to send from?

- [List Segmentation](https://warminboxes.com/skills/list-segmentation) — Who hosts the people on this list?

- [Infrastructure Planner](https://warminboxes.com/skills/infrastructure-planner) — How many mailboxes do I need, and what does it cost?