How to Install an AI Skill for Customer Welcome Emails

Your newest customer forgets you exist by day three. That is not a marketing problem. That is a missing file.

Tomas runs a three-person bike repair shop in Lisbon. Someone books their first service through his website, gets a confirmation email, and that is it. No welcome message. No tip on how to keep a chain from rusting in the rain. No gentle nudge toward the seasonal tune-up package three weeks later. Tomas knows he should send something. He has known for two years. He has never done it, because sitting down to write three good emails, then wiring up the timing and the automation logic behind them, always loses to the ten actual bikes waiting on the rack.

This is not a Tomas problem. It is what happens to the single most valuable moment in any small business, the first week after someone becomes a customer, in businesses everywhere: a bakery in Lagos, a physiotherapy clinic in Manila, a landscaping crew in Ohio, a tutoring service in Nairobi. The moment is high-value and low-effort to capture. It just never gets captured, because it competes with the actual work.

How do you automate a welcome email sequence with AI?

You stop trying to write it yourself, and you install a skill that already knows how. An AI skill is a small, self-contained instruction file, usually a markdown document, that tells an AI agent exactly how to do one job: what to check first, what steps to follow, and what a finished result looks like. On 13 August, marketing consultant Corey Haines published one for exactly this job. He described it plainly: "I made a skill that writes welcome sequences that activate instead of annoy. Three emails, each teaching one thing, only the last one sells, built as a real automation with waits and skip conditions, pushed straight to your ESP." You install it with one line in a terminal, npx skills add coreyhaines31/marketingskills, and the agent you already use, Claude Code, Codex, Cursor, or any tool that reads the same skill format, can run it.

The pain: the most valuable email you own is the one you never send

Here is the quiet math most small business owners never sit down and do:

• A new customer is far more likely to open your first message than any email you send six months later, when the relationship has gone cold.
• That first message is the only time you can set expectations, teach one useful thing, and remind them what made them choose you, all without sounding like a sales pitch.
• Writing three good emails takes an afternoon. Wiring up the send timing, the skip logic for people who already replied, and pushing it live to your email platform takes technical setup most owners do not have time to learn.
• So it stays a task on the list, forever "next week," while every new customer gets a single receipt and silence.

Every one of those steps used to depend on a person sitting down, in the right mood, with an afternoon free. The bottleneck was never the idea. It was the afternoon.

What is an AI skill, really?

A skill is not a plugin in the traditional sense and not a prompt you type each time. According to a walkthrough published this month by developer tool maker Talocode, a skill is "a self-contained instruction file the agent can load on demand," typically a file named skill.md. The top of the file is a short header naming the skill, describing in one precise sentence when it applies, and listing a version and license. Below that header sits the actual workflow: the steps, a validation checklist, and the exact fields a finished result must include. When you ask your agent to do something, in Talocode's words, "the agent looks at the skills it has and reads their front matter" and loads whichever skill matches your request, automatically, with no slash command needed.

This is why Corey Haines' welcome-sequence skill works the moment you install it. You are not teaching the agent marketing from scratch every time. You are handing it a checklist a good email marketer already wrote once, and letting the agent execute it against your business, your product, and your voice.

Why this is possible now

Two things changed to make this possible. First, coding agents like Claude Code, OpenAI's Codex, and Cursor all converged on the same skill.md file format this year, so a skill written once works across every major agent rather than being locked to one platform. Second, the install mechanism borrowed a trick from software developers: the same npx command node developers have used for a decade to fetch a package now fetches a skill file instead. You do not need a developer's knowledge to run it, you need a terminal window and one line, copied exactly as written.

That is a meaningfully lower bar than it was even a year ago, when the same welcome-sequence logic would have meant hiring someone to configure Mailchimp, Klaviyo, or ConvertKit by hand, or paying a marketing agency a monthly retainer to do it for you.

Isn't this just an email template?

No, and the difference is the automation logic, not the writing. A template is words on a page that you still have to schedule, personalise, and monitor yourself. A skill like this one builds "a real automation with waits and skip conditions," in Corey Haines' own description: it knows to wait a set number of days between emails, and it knows to skip the next email in the sequence if the customer has already replied or bought something, so nobody gets an awkward "don't forget to buy!" message the day after they bought. That branching logic is the part a plain template never had, and the part most small business owners never had time to build by hand.

Build it: install and launch your welcome sequence, step by step

1. Open a terminal and confirm you have Node.js installed. Type node -v. If nothing comes back, install Node first, everything else in this process depends on it.
2. Run the install command. Type npx skills add coreyhaines31/marketingskills and press enter. This fetches the skill file straight from its public GitHub repository into your agent's skill directory, the same mechanism developers use to install a code package.
3. Open your AI coding agent, Claude Code, Codex, or Cursor, and start a new session. New skills are picked up when a session starts, so if you installed mid-session, start a fresh one.
4. Describe your business in one message. Tell the agent what you sell, who buys it, and what you want a new customer to know in their first week. The agent matches your request against the skill's description and loads it automatically, no special command required.
5. Review the three drafted emails before anything goes out. Check the tone matches your voice, the one useful tip in email two is actually useful, and the offer in email three is one you can honour.
6. Connect it to your email platform and let the wait-and-skip logic run. Once it is pushed to your ESP, the sequence fires for every new customer automatically, and skips ahead correctly for anyone who has already engaged.

What you have after this

A week in, every new customer gets a message on day one instead of silence, without you writing a word of it yourself.

A month in, you can see which of the three emails people actually open, and adjust the one useful tip in email two based on what real customers ask you most.

Six months in, this is simply what happens when someone becomes a customer. You have probably installed a second skill by then, one that drafts your review requests, or your invoice reminders, using the exact same one-line install pattern. The skill itself is free and public. What you save is the afternoon you were never going to find.

Same shop. Same customers. One file that finally does the introduction for you.