Installation
npx skills add oakoss/agent-skills --skill resend 33
Installs
Resend
Overview
Resend is a modern email API built for developers, providing programmatic email sending with support for React Email components, domain management, and webhook-driven event tracking.
When to use: Transactional emails (welcome, password reset, receipts), batch email delivery, scheduled sending, webhook-based delivery tracking, domain verification, React Email integration.
When NOT to use: High-volume marketing automation (use dedicated ESP), SMS/push notifications, email hosting/inbox management.
Quick Reference
| Pattern | API | Key Points |
|---|---|---|
| Send email | resend.emails.send({ from, to, subject }) |
Returns { data, error }, supports html/text/react content |
| Send with React | resend.emails.send({ react: <Email /> }) |
Node.js SDK only, renders React Email components server-side |
| Batch send | resend.batch.send([...emails]) |
Multiple emails in one request, no attachments/scheduling |
| Schedule email | emails.send({ scheduled_at }) |
ISO 8601 or natural language, cancel before send window |
| Attachments | emails.send({ attachments: [...] }) |
Max 40MB total after encoding, supports content or path |
| Idempotent send | emails.send(params, { idempotencyKey }) |
Prevents duplicate sends on retry |
| Retrieve email | resend.emails.get(emailId) |
Check delivery status and metadata |
| Add domain | resend.domains.create({ name }) |
Returns DNS records for SPF, DKIM, MX |
| Verify domain | resend.domains.verify(domainId) |
Triggers DNS record check |
| List domains | resend.domains.list() |
Returns all domains with status |
| Create webhook | Dashboard or API | Subscribe to email lifecycle events |
| Verify webhook | resend.webhooks.verify({ payload, ... }) |
Validates Svix signature headers |
| Tags | emails.send({ tags: [...] }) |
Key-value pairs for categorization, ASCII only, max 256 chars |
| Custom headers | emails.send({ headers: {...} }) |
Add custom email headers |
| Create contact | resend.contacts.create({ email, ... }) |
Global contacts with custom properties |
| List contacts | resend.contacts.list() |
Returns all contacts |
| Create broadcast | resend.broadcasts.create({ from, ... }) |
Bulk email to a segment, supports template variables |
| Send broadcast | resend.broadcasts.send(id, { segmentId }) |
Delivers broadcast to a segment of contacts |
Common Mistakes
| Mistake | Correct Pattern |
|---|---|
| Using root domain for sending | Use a subdomain like send.yourdomain.com to isolate reputation |
Not checking error in response |
Always destructure { data, error } and handle errors |
| Sending attachments in batch requests | Attachments and scheduling are not supported in batch sends |
| Hardcoding API key in source code | Use environment variable RESEND_API_KEY |
| Skipping webhook signature verification | Always verify using Svix headers before processing events |
Using react prop outside Node.js SDK |
The react prop only works with the Node.js SDK |
| Not setting up DMARC after SPF/DKIM verify | Add DMARC record after SPF and DKIM pass to improve deliverability |
| Exceeding 50 recipients in a single send | Use batch send or loop for more than 50 recipients per request |
Using && for tag name/value characters |
Tag names and values must be ASCII letters, numbers, _, or - |
| Ignoring bounce/complaint webhooks | Monitor email.bounced and email.complained to protect reputation |
Delegation
- Email template design: Use
Exploreagent to discover React Email component patterns - Domain DNS configuration: Use
Taskagent for step-by-step DNS setup verification - Webhook endpoint setup: Use
Taskagent for route handler implementation
References
Installs
Security Audit
View Source
oakoss/agent-skills
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How to use this skill
Install resend by running npx skills add oakoss/agent-skills --skill resend in your project directory. Run the install command above in your project directory. The skill file will be downloaded from GitHub and placed in your project.
No configuration needed. Your AI agent (Claude Code, Cursor, Windsurf, etc.) automatically detects installed skills and uses them as context when generating code.
The skill enhances your agent's understanding of resend, helping it follow established patterns, avoid common mistakes, and produce production-ready output.
What you get
Skills are plain-text instruction files — not executable code. They encode expert knowledge about frameworks, languages, or tools that your AI agent reads to improve its output. This means zero runtime overhead, no dependency conflicts, and full transparency: you can read and review every instruction before installing.
Compatibility
This skill works with any AI coding agent that supports the skills.sh format, including Claude Code (Anthropic), Cursor, Windsurf, Cline, Aider, and other tools that read project-level context files. Skills are framework-agnostic at the transport level — the content inside determines which language or framework it applies to.
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