Automated summary

Designs and sends HTML marketing emails, covering asset hosting, a reusable component library, GIF conversion, and delivery through the Resend API.

Strengths

Gives concrete email-safe asset rules (file size, width, frame rate, versioned filenames).
Ships a reusable library of HTML blocks (hero, frost-glass cards, CTA, footer) built on table layouts.
Covers the full pipeline from MP4-to-GIF conversion through sending with Resend.
Calls out common pitfalls: relative paths, preheader text, aggressive client-side caching.

Limitations

Tightly coupled to Resend and a static public/ folder, so it transfers poorly to other ESPs or stacks.
Says nothing about deliverability, audience segmentation, or A/B testing.
The component section is only partially shown; users often need to copy from a previous campaign.

When to use it

Use it whenever you need to write, lay out, or send a marketing email campaign with hosted visuals and the provided component library.

When not to use it

Avoid it for transactional emails, complex automation sequences, or sending through a provider other than Resend.

Security analysis

Caution

Quality score84/100

The skill is a straightforward email-design and delivery workflow. It uses Bash, file writes, and network sends, but all for legitimate purposes: ffmpeg blur/GIF conversion, committing static assets, and posting campaigns through Resend. There is no destructive command, no exfiltration of secrets, and the only base64 blob decodes to a harmless SVG noise texture. Because it invokes shell and external API calls, it merits 'caution' rather than 'safe'.

Findings

•Uses Bash with network access (ffmpeg installs, Resend API sends) for legitimate asset processing and email delivery
•Sends email via third-party Resend API, which requires handling an API key; skill does not instruct leaking it but does not warn about secret handling either
•Contains a base64 data-URI SVG in inline styles — benign (a noise texture), not an obfuscated payload, but worth noting for reviewers
•Encourages writing files into project public/ directories served as a CDN, which could inadvertently publish non-email assets if paths are misused

How this analysis is made

Examples

Launch campaign email

Create a launch email for our new analytics dashboard — hero image at the top, a GIF demo of the feature, and a CTA button linking to the blog post.

Multi-email announcement

Draft a 3-email sequence announcing our winter release, host the images in public/email-assets/winter-launch/, and send it via Resend.

Optimize a demo GIF

Convert demo.mp4 into a GIF under 1.5 MB at 720px wide and 12 fps, then embed it in the email as a thumbnail linking to the MP4.

name: email-campaigns version: 1.0.0 description: | Design, build, and send beautiful HTML email campaigns via Resend. Handles asset hosting (images + GIFs on your own CDN), the pre-built email HTML component library (frost-glass cards, hero image, video blocks with blurred backgrounds, CTA buttons, footer), GIF optimization from MP4 source video, and sending via the Resend API. Use when asked to "create an email", "draft a marketing email", "send a campaign", "make an email sequence", or "build an email with Resend". Proactively suggest when the user mentions sending marketing emails, launching a feature via email, or designing a newsletter. allowed-tools:

Bash
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Email Campaigns

Name: Email Campaigns
Author: Skills Guide Bot

Build modern, on-brand marketing emails and send them via Resend. This skill encodes a complete pattern: asset hosting, reusable HTML components, GIF tooling, and the Resend send pipeline.

1. Asset hosting — use your own site as a CDN

Setup once. In a Next.js or any static-hosted project, create a folder served at the site root:

<project>/public/email-assets/
  <campaign-name>/
    hero.png
    demo.gif

Anything in public/ is served at https://yourdomain.com/email-assets/.... Commit + push = instant CDN. No Cloudinary, no S3.

Rules for email-safe assets:

Naming: lowercase, dashes only (hero-image.jpg ✅, Hero Image.jpg ❌)
Images: JPG/PNG, ≤ 1 MB, max 600px wide
GIFs: ≤ 1.5 MB, max 720px wide, 12-15 fps, keep under 8 seconds
Video: MP4 in same folder, but NEVER embed <video> — always use GIF thumbnail linking to MP4
Version filenames instead of overwriting (hero-v2.jpg) — email clients cache aggressively

Before sending: swap all local paths to absolute URLs (https://yourdomain.com/email-assets/...). Relative paths work in browser preview but break in recipients' inboxes.

2. Design system — reusable blocks

Use this building-block inventory. Copy from a previous campaign, don't redesign from scratch.

Outer shell

<body style="margin:0; padding:0; background-color:#ffffff;
             font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Helvetica,Arial,sans-serif;">
  <div style="display:none; max-height:0; overflow:hidden; font-size:1px; line-height:1px; color:#fff;">
    [PREHEADER — 1 sentence, shown in inbox preview]
  </div>
  <table width="100%" cellpadding="0" cellspacing="0" border="0" style="background-color:#ffffff;">
    <tr><td align="center" style="padding:32px 16px;">
      <table width="560" cellpadding="0" cellspacing="0" border="0"
             style="max-width:560px; width:100%;">
        <!-- MAIN CARD -->
        <tr><td>
          <table width="100%" cellpadding="0" cellspacing="0" border="0"
                 style="background-color:#f7fbfe;
                        background-image: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyMDAiIGhlaWdodD0iMjAwIj48ZmlsdGVyIGlkPSJuIj48ZmVUdXJidWxlbmNlIHR5cGU9ImZyYWN0YWxOb2lzZSIgYmFzZUZyZXF1ZW5jeT0iMC44NSIgbnVtT2N0YXZlcz0iMiIgc3RpdGNoVGlsZXM9InN0aXRjaCIvPjwvZmlsdGVyPjxyZWN0IHdpZHRoPSIxMDAlIiBoZWlnaHQ9IjEwMCUiIGZpbHRlcj0idXJsKCNuKSIgb3BhY2l0eT0iMC4wNiIvPjwvc3ZnPg=='),
                                         linear-gradient(90deg, #edf6fd 0%, #f6fbfe 50%, #fcfdfe 100%);
                        border-radius:4px;
                        box-shadow: 0 2px 8px rgba(24,24,27,0.06), 0 8px 24px rgba(24,24,27,0.04);
                        overflow:hidden;">
            <!-- sections go here -->
          </table>
        </td></tr>
      </table>
    </td></tr>
  </table>
</body>

Key tokens:

Card bg: light sky gradient + 6% SVG noise texture for depth (subtle grain). Gradient direction 90deg = left→right.
Card shadow: layered soft shadow, no border
Card radius: 4px (tight corners feel modern)

Header image

Full-width image flush with card top. Crop the top 3/4 of a wide image (1376×576 cropped from 1376×768) for hero; use the bottom 1/3 (256px) as a footer image inside the card.

Logo cards (frost-glass)

Five logos distributed across full card width via width="20%" columns. Each card 72×72, light fill (#f4f4f7 gradient), soft shadow, 3px radius.

Hero title + body

<h1 style="font-size:26px; font-weight:700; color:#18181b; letter-spacing:-0.5px;">...</h1>
<p style="font-size:15px; line-height:1.65; color:#3f3f46;">...</p>

Feature list with black bullets (not green checks)

Keep bullets black • in a 20px cell, text 15px. Avoid green check pills — they look dated.

Video block (frost-glass with blurred bg)

Pre-blur your brand hero image with ffmpeg to use as a colorful bed behind videos:

ffmpeg -y -i header.png -vf "boxblur=luma_radius=30:luma_power=3" header_blur.png

Then:

<a href="LANDING-URL">
  <p>Video title</p>
  <table width="100%">
    <tr><td style="background-image:url('https://yourdomain.com/email-assets/header_blur.png');
                   background-size:cover; border-radius:3px; padding:14px;
                   box-shadow:0 4px 14px rgba(24,24,27,0.1);">
      <table width="100%">
        <tr><td style="background-color:rgba(255,255,255,0.55);
                       backdrop-filter:blur(12px);
                       -webkit-backdrop-filter:blur(12px);
                       border:1px solid rgba(255,255,255,0.6);
                       border-radius:3px; padding:10px;
                       box-shadow:inset 0 1px 0 rgba(255,255,255,0.5);">
          <img src="GIF-URL" width="475" style="display:block; width:100%;
                                                max-width:475px; border-radius:3px;">
        </td></tr>
      </table>
    </td></tr>
  </table>
</a>

In Apple Mail/iOS: backdrop-filter renders real glass. In Gmail/Outlook: the pre-blurred image underneath sells the effect on its own.

CTA button

Black pill, 4px radius, 14px 24px padding, optional small logo inline:

<table width="100%"><tr><td align="center"
       style="border-radius:4px; background-color:#18181b;">
  <a href="LANDING-URL" style="display:block; padding:14px 24px;
                               font-size:14px; font-weight:600; color:#fff;
                               text-decoration:none;">
    <img src="LOGO" width="20" height="20"
         style="display:inline-block; vertical-align:middle;
                margin-right:8px; border-radius:3px;" alt="">
    <span style="vertical-align:middle;">Connect your accounts &rarr;</span>
  </a>
</td></tr></table>

Place one CTA immediately after the first proof video (highest conversion moment) and one at the bottom.

Typography scale

H1: 26px
Body/features/video titles: 15px
Section labels/footer: 13px
CTA button: 14px

Stick to this. No more than 3 sizes.

3. GIF optimization workflow

For each screen recording:

# Convert MP4 → optimized GIF (720px, 15fps, 2x speed, trim to 8s)
ffmpeg -y -i source.mp4 -t 8 \
  -vf "setpts=0.5*PTS,fps=15,scale=720:-1:flags=lanczos,split[s0][s1];\
       [s0]palettegen=max_colors=256[p];\
       [s1][p]paletteuse=dither=sierra2_4a" \
  -loop 0 output.gif

# Check file size — should be under 1.5 MB
ls -lh output.gif

If too big:

Drop to 12fps
Reduce width to 600px
Trim to 5-6 seconds
Drop palette to 128 colors, use dither=bayer:bayer_scale=5

If too low quality:

Bump to 720-900px
256 colors with sierra2_4a dither
Accept 1.5-2 MB ceiling

4. Sending via Resend

Setup (once per project)

npm install resend

Env var: RESEND_API_KEY=re_... (get from resend.com dashboard)

From domain: verify your sending domain in Resend settings first (DNS records take ~15 min to propagate). Use hello@yourdomain.com, not a free provider.

Send a single test email

// send.mjs
import { Resend } from 'resend';
import fs from 'fs';

const resend = new Resend(process.env.RESEND_API_KEY);
const html = fs.readFileSync('./email.html', 'utf-8');

const { data, error } = await resend.emails.send({
  from: 'Ira <hello@get-ryze.ai>',
  to: 'you@example.com',
  subject: 'Claude Connector for Google/Meta Ads is live',
  html,
  // Optional plain-text fallback
  text: 'We released the Claude connector. Connect in 1 click: https://...',
});

console.log(error ?? data);

Run: node send.mjs. Always send to yourself first.

Send to a list (batches)

Resend rate-limits at 10 req/sec (free) or 100 req/sec (paid). For larger lists use their batch API:

await resend.batch.send(
  recipients.map(email => ({
    from: 'Ira <hello@get-ryze.ai>',
    to: email,
    subject: '...',
    html,
  }))
);

Up to 100 emails per batch call. Chunk your list accordingly.

Sequences / drip campaigns

For a 3-email sequence (day 0, day 3, day 7), use a cron + a sent-state table in Postgres/Supabase:

// Pseudo
const dueToday = await db.campaigns.findMany({
  where: { scheduled_date: today, status: 'pending' }
});
for (const c of dueToday) {
  await resend.emails.send({ ...c });
  await db.campaigns.update({ where: { id: c.id }, data: { status: 'sent' } });
}

Resend has webhooks for email.delivered, email.opened, email.clicked — use them to trigger the next email in the sequence rather than fixed timers.

5. Pre-send checklist

Before you hit send on a real list:

[ ] All asset URLs are absolute (https://...), not relative (/email-assets/...)
[ ] Preheader text set (first hidden div) — this is the inbox preview line
[ ] Subject line tested for deliverability (no ALL CAPS, no exclamation spam)
[ ] Every image has meaningful alt text
[ ] Every link has target="_blank"
[ ] GIFs under 2 MB each, total email under 5 MB
[ ] Tested in at least: Gmail web, Gmail mobile, Apple Mail, Outlook
[ ] Unsubscribe link in footer (required by CAN-SPAM / GDPR)
[ ] Sent one test to yourself — clicked every link
[ ] from address is on a verified domain in Resend

6. Conversion best practices

One primary CTA — repeated twice (mid-email + bottom). Don't dilute with secondary actions.
Video first, text second — a 3-second GIF shows product faster than 3 paragraphs.
Specificity wins — "Connect in 1 click" > "Get started". "30-second setup" > "Easy to install".
Claim + proof — every claim near a visual (GIF, screenshot, or logo strip showing integrations).
Low-friction reply CTA — "Reply 'Guide' and I'll send you X" is high-intent and cheap to fulfill.
Send Tuesday-Thursday, 9-11am recipient-local. Avoid Monday (full inboxes) and weekends (low open).

7. Template starter

To bootstrap a new campaign, copy the most recent working HTML from your repo (e.g. public/email-assets/preview/claude-connector.html) and edit in place. Keep the preview file checked in alongside the campaign folder:

public/email-assets/2026-05-launch/
  hero.png
  demo.gif
  preview.html

Preview locally at http://localhost:3000/email-assets/2026-05-launch/preview.html.

8. What NOT to do

❌ Don't use <video> tags — blocked in Gmail/Outlook
❌ Don't use CSS grid or flexbox — broken in Outlook. Use nested <table>s.
❌ Don't use web fonts — most clients strip them. Stick to system font stack.
❌ Don't use background images on the <body> if you need them on mobile Gmail — it ignores body bg. Put color inside the main card.
❌ Don't embed MP4 directly — always GIF preview → link to external MP4.
❌ Don't send without testing — render one in Litmus/Mailtrap or just send to yourself on 3 clients.

From the file to a first result

The download contains exactly the content displayed on this page. This copy may differ from the latest version in the source repository.

View the source and supporting files

This download contains SKILL.md only. Any scripts, references, templates and dependencies are not included. Get the required files from the source, preserving their directory structure, before continuing.

1. Download the file

Download SKILL.md

From the root of a test project, save the file as .skill-downloads/email-campaigns-ms47vogz/SKILL.md, or use the command below. This folder is for inspecting the skill before installation.

Command for macOS/Linux or WSL: requires a POSIX shell and curl. On Windows without WSL, use the download button and create the folder manually.

mkdir -p '.skill-downloads/email-campaigns-ms47vogz' && curl --fail --show-error --location 'https://skills-guides.com/api/skills/email-campaigns-ms47vogz/download' --output '.skill-downloads/email-campaigns-ms47vogz/SKILL.md.part' && mv '.skill-downloads/email-campaigns-ms47vogz/SKILL.md.part' '.skill-downloads/email-campaigns-ms47vogz/SKILL.md'

2. Check prerequisites

Read SKILL.md before using it. If it references scripts or external services, inspect them and prepare the required access in your test environment.

No recognized prerequisites section in this file. This does not mean it is self-contained: libraries, tools and access requirements may be mentioned elsewhere in the content or source repository.

The platforms on this page are catalog indications. The paths below follow tool documentation; they do not prove this skill has been run in those tools. No minimum tool version is confirmed for this listing.

3. Load the skill

After inspection, copy the complete folder into your project using one of the commands below, then open a new tool session. The command stops if a folder with the same name already exists: compare the files before replacing it.

Claude Code

test -f '.skill-downloads/email-campaigns-ms47vogz/SKILL.md' && test -s '.skill-downloads/email-campaigns-ms47vogz/SKILL.md' && mkdir -p '.claude/skills' && test ! -e '.claude/skills/email-campaigns' && cp -R '.skill-downloads/email-campaigns-ms47vogz' '.claude/skills/email-campaigns'

OpenSkills

OpenSkills must already be installed. The local install/read procedure is checked with OpenSkills 1.5.0, which requires Node.js ≥ 20.6.0. Catalog slugs are not resolved automatically.

Official OpenSkills installation

openskills install './.skill-downloads/email-campaigns-ms47vogz'

openskills read 'email-campaigns-ms47vogz'

Reading should display the installed file content and its base directory. It does not run the skill or install its dependencies.

For an agent that reads AGENTS.md, then sync the index. This command changes AGENTS.md: review the diff before using it.

openskills sync

Manual method or another tool: attach SKILL.md to a conversation, or open it in an agent that can read files. Include any required supporting resources. No universal folder is recognized by every tool.

4. Try a first task

Use a short, synthetic input: an API endpoint, a small document or an interface brief. In a new conversation, attach the file or give the agent its path, then adapt this request:

Read .skill-downloads/email-campaigns-ms47vogz/SKILL.md and apply its instructions to this example: [describe a test input]. Identify any missing files, dependencies or access. Produce the result requested by the skill without inventing data or running unreviewed scripts.

Expected result: output matching the skill instructions, or a precise list of missing prerequisites. A read confirmation alone does not validate a first use. If an external resource is unavailable, that path remains untested.

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Email Campaigns

Recommended for

Automated summary

Strengths

Limitations

Security analysis

Examples

Email Campaigns

1. Asset hosting — use your own site as a CDN

2. Design system — reusable blocks

Outer shell

Header image

Logo cards (frost-glass)

Hero title + body

Feature list with black bullets (not green checks)

Video block (frost-glass with blurred bg)

CTA button

Typography scale

3. GIF optimization workflow

4. Sending via Resend

Setup (once per project)

Send a single test email

Send to a list (batches)

Sequences / drip campaigns

5. Pre-send checklist

6. Conversion best practices

7. Template starter

8. What NOT to do

From the file to a first result

1. Download the file

2. Check prerequisites

3. Load the skill

4. Try a first task

Writing Fragments

UI Copywriting & Auditing

Music MIDI Extraction