Build your own email design tools: generative plugins for lifecycle teams

Every email team has that list. The little repetitive tasks nobody enjoys: slicing designs for export, checking alt text, hunting for unsupported CSS before handoff, renaming layers to match production conventions. Individually they're minutes; across a year of campaigns they're weeks.

The traditional fix was to build a custom Figma plugin, which meant you needed an engineer with spare time and a reason to care. Most teams never got one. We were lucky: at Scalero we built AutoSlice, our own plugin that turns email designs into production-ready slices, and it's saved us hundreds of hours. But we also know what it cost to build.

That cost just collapsed. With generative plugins, announced at Figma's annual conference (the full session from Figma's product team explains the mechanics), you describe the tool you need in plain language and the agent builds a functional, reusable plugin, instantly, personalized to your workflow.

What a generative plugin actually is

The concept is simple: instead of writing plugin code, you write a prompt. "Build me a tool that checks every text layer in a frame for font sizes below 14px and lists the offenders." The agent generates the plugin, you run it, and if it's not quite right, you refine it conversationally, the same way you'd give feedback to a teammate.

The result is a real, reusable tool that lives in your workspace. 

The email linter: the first plugin every email team should build

If you build exactly one generative plugin, make it this: an on-canvas email linter tuned to your coding standards.

Here's the concept. Select a frame, run the tool, and instantly flag:

• Unsupported CSS properties that will break in major email clients

• Table structures that won't behave responsively

• Missing alt text on images (an accessibility and deliverability issue)

• Text sizes below your mobile readability threshold

• Off-brand colors that don't match your token palette

Every one of those issues is currently caught, if it's caught at all, during QA testing, after the HTML is built. Moving those checks onto the canvas means problems get fixed when they cost minutes, not hours. The same philosophy applies to email accessibility and reliable layouts: catch it early, catch it cheap.

The goal in one line: Gmail-perfect, Outlook-proof, before the HTML ever leaves Figma.

Four more plugin ideas for lifecycle teams

1. The campaign duplicator

Duplicate a master campaign frame for five audience segments or languages, swapping in the right copy deck for each and flagging any layout breaks caused by longer text. Localization stops being an afternoon of copy-paste.

2. The UTM builder

Select every link layer in a design and generate consistent, correctly formatted UTM parameters based on your naming conventions. No more mismatched campaign tags between email and analytics.

3. The dark mode previewer

Simulate how your design's colors will behave under dark mode inversion, on canvas, before you build. Flag white logos on white backgrounds and low-contrast combinations.

4. The spec sheet generator

One click: export a handoff document listing every image dimension, font size, hex value, and link URL in the design. Developers stop guessing; designers stop answering the same Slack questions. It's marketing automation thinking, applied to the design stage.

How to get started 

• Week 1: list every repetitive task your team did on the last three campaigns. Rank by frequency times annoyance.

• Week 2: build the top item as a generative plugin. Keep the first version embarrassingly simple, one check, one output.

• Week 3: run it on a real campaign. Collect what it missed and what it got wrong, then refine the prompt.

• Week 4: roll it out to the team and start on tool number two.

The teams that win with this won't be the ones that build the most plugins. They'll be the ones that build tools encoding their actual standards, the accumulated judgment of how their campaigns should be built.

The bottom line

We built AutoSlice the hard way, and it was worth it. Now every team can build their own tooling the easy way, and honestly, that's better for everyone. Your workflows are full of minutes waiting to be reclaimed. If you want help figuring out which tools would move the needle for your email program, let's talk.