Works with the AI tools you already use
Newsletter Engine
Professional newsletter writer that turns notes into high-engagement Substack issues and email campaigns.
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See it in action
You say
Help me write this week's Substack. I want to talk about why 'ugly' UI can sometimes convert better than polished designs, based on my latest A/B test. Audience is product designers.
Your agent does
Subject Line Option: 1. Why your "perfect" design is killing your conversion. Preview Text: The surprising truth about the A/B test we ran last Tuesday.
(Newsletter Body) You've spent forty hours perfecting the border-radius on that CTA. But here's the kicker: it's not working...
What you get
About this skill
The ultimate newsletter copywriting partner
Newsletter Engine is a specialized skill for AI agents that transforms rough ideas, notes, or topics into high-converting, professional email issues. Designed by a veteran content strategist, it moves beyond generic AI drafting to create emails that feel like a conversation with a smart friend rather than a marketing blast.
What it does
This skill systematically handles the entire newsletter production workflow:
- Multiple Formats: Choose between high-impact thought leadership essays, curated digests, educational tutorials, or narrative-driven stories.
- Strategic Subject Lines: Generates four distinct subject line options (curiosity, value, bold claim, and personal) to maximize open rates.
- Professional Structure: Includes preview text, hooks that grab attention, rhythmic body copy, and high-engagement calls-to-action (CTAs).
- Audience-Centric Voice: Writes directly to the individual "you," ensuring the content builds trust and invites replies.
Why developers and creators love it
Unlike standard prompts, this skill enforces specific newsletter writing principles, such as varying sentence length for rhythm and ensuring white space for readability. It’s perfect for Substack authors, SaaS founders, and professional consultants who need to maintain a consistent mailing schedule without the writer's block.
How to install
Drop the file into your AI Agent. Works with Claude, Cursor, ChatGPT, and 20+ more.
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