One request in. A Klaviyo-ready email out.
Margarita is the email skill we use for client work, now free for everyone. Give your agent a brand link, a folder of photos and your colors. It reads the brand, writes the copy, builds the HTML and checks it before you see it.
Drag the line: what the agent got, and what it gave back
- Subjects A and B, plus preview text
- Copy in the brand's voice
- HTML for Gmail, Outlook and dark mode
- A Klaviyo import zip with the images
npx skills add yenderfonseca/margarita
- Cedar Hearth$42
- Glass Refill Jar$18
- "We pour every candle the way we would for our own home"Ines, founder
Hearth Field is a fictional demo brand. Photos from Unsplash.
An email designer that already knows your niche
Built on a library of 1,127 real emails from top DTC brands: which blocks they open with, how their subject lines read, how long their flows run. That method is packed into the skill so every email starts from what works.
You ask once. It reads, decides, writes and checks.
Reads the brand
It fetches the site, takes the voice from real sentences, finds the fonts and the products, and maps your colors to text, buttons and backgrounds with contrast checks. Anything it had to guess is listed for you to confirm.
Designs the email
It picks the occasion, the audience and the style that fits your niche, then writes two subject lines, preview text and copy that sounds like the brand. One idea and one button per email.
Checks before you see it
Klaviyo tags, legal footer, palette, dark mode, Outlook buttons, images-off reading, orphan words and spam phrases are checked in a real browser at desktop and phone widths.
Every email is checked before you ever open it
Two built-in tools lint the HTML and render it in a real browser. An email that fails does not get delivered.
Klaviyo-correct tags
Unsubscribe, preferences, web view and address tags in the forms Klaviyo documents. Every name has a fallback.
Facts only
Prices, offers, reviews and policies come from the brand. Each claim is listed with its source.
Your palette, locked
Every color in the HTML is one of yours or a mix of two of them. Contrast is checked automatically.
Works in every inbox
Table layout, bulletproof Outlook buttons, dark mode, phone stacking and under Gmail's clipping limit.
Readable with images off
Headlines and offers are live text, and every photo has descriptive alt text.
No orphan words
Measured line by line at desktop and phone widths, so no heading ends on a lonely word.
No spam habits
Stacked exclamation points, filler and spam-trigger phrases are flagged before they ship.
Niche compliance
Alcohol, supplements, CBD, finance and kids get the claims rules their category needs.
Get Margarita Email Designer
Subscribe to the Margarita Creative Newsletter. The download link, a ready-to-upload .zip, arrives in the first email.
One email a week at most. Unsubscribe in one click.
Install in one line, in any agent
- Any agent: one command links Margarita into Claude Code, Antigravity, Cursor and others.
npx skills add yenderfonseca/margarita - Claude on the web or desktop: subscribe here, open the first email for the zip, then upload it in Customize, Skills, +, Create skill, Upload a skill.
- Claude Code:
git clone https://github.com/yenderfonseca/margarita ~/.claude/skills/margarita - Google Antigravity:
git clone https://github.com/yenderfonseca/margarita ~/.gemini/config/skills/margarita
Every step, the command line and the Klaviyo import are in the Margarita docs.
New to skills? Read what Claude Skills are and how to install one.
Questions
Does it send emails or connect to my Klaviyo account?
No. It builds the files: email HTML, an import zip with your images, subject lines and notes. You import the template into Klaviyo and send it from there, so nothing reaches your list without you.
What if my site is down or I only have a logo?
It still delivers. It works from what you give it, uses text-led layouts when there are no photos, and lists every brand element it had to infer so you can check it.
Will it make up a discount or a review?
No. Offers, codes, prices, reviews, deadlines and stock claims only come from your site or your brief, and every claim is listed with where it came from.
Which colors does it use?
Only yours. Give it three (background, text and accent) and it derives the rest by mixing them, with contrast checked for every pair.
Does it work for flows, not just campaigns?
Yes. Welcome, abandoned checkout, browse abandonment, post-purchase and winback are built in, email by email, with timing and Klaviyo event tags.
Is it really free?
Yes. It is open source under the MIT license: use it for your own brand, your clients or your own tools. The code is on GitHub, and the docs explain every step.
Example brands are fictional demos. Photos from Unsplash by Charles Givens, Claire Abdo, Daniel Romero, Darío Méndez, Gage Walker, Hannah Smith, JC Gellidon, Jaelynn Castillo, Jhong Estacio, Kabo, Lee Campbell, Mariia Berezovsky, Matthew Moloney, Nadia Valko, NutraSeller Manufacturing, PRAHANT STUDIO, Ryan Ashby, Stephan Koning, Tobias Tullius, With Mahdy and pmv chamara.