Agent skill

resend

Resend email API via curl. Use this skill to send transactional emails, manage contacts, domains, and API keys.

Stars 163

Forks 31

Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/other/resend-neversight-skills-feed

SKILL.md

Resend Email API

Send transactional emails, manage contacts, and domains via Resend's REST API.

Official docs: https://resend.com/docs/api-reference/introduction

When to Use

Use this skill when you need to:

Send transactional emails (welcome, password reset, notifications)
Send batch emails to multiple recipients
Manage email contacts and audiences
Verify and manage sending domains
Track email delivery status

Prerequisites

Sign up at https://resend.com
Go to API Keys: https://resend.com/api-keys
Create a new API key

Set environment variable:

bash

export RESEND_API_KEY="re_xxxxxxxxx"

Important: When using $VAR in a command that pipes to another command, wrap the command containing $VAR in bash -c '...'. Due to a Claude Code bug, environment variables are silently cleared when pipes are used directly.

Placeholders: Values in {curly-braces} like {email-id} are placeholders. Replace them with actual values when executing.

Emails

Send Email

Write to /tmp/resend_request.json:

json

{
  "from": "Acme <[email protected]>",
  "to": ["<your-recipient-email>"],
  "subject": "<your-subject>",
  "html": "<p><your-html-content></p>"
}

Then run:

bash

bash -c 'curl -s -X POST "https://api.resend.com/emails" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

Send Email with Plain Text

Write to /tmp/resend_request.json:

json

{
  "from": "Acme <[email protected]>",
  "to": ["<your-recipient-email>"],
  "subject": "<your-subject>",
  "text": "<your-plain-text-content>"
}

Then run:

bash

bash -c 'curl -s -X POST "https://api.resend.com/emails" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

Send Email with CC/BCC

Write to /tmp/resend_request.json:

json

{
  "from": "Acme <[email protected]>",
  "to": ["<your-recipient-email>"],
  "cc": ["<your-cc-email>"],
  "bcc": ["<your-bcc-email>"],
  "subject": "<your-subject>",
  "html": "<p><your-html-content></p>"
}

Then run:

bash

bash -c 'curl -s -X POST "https://api.resend.com/emails" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

Send Email with Reply-To

Write to /tmp/resend_request.json:

json

{
  "from": "Acme <[email protected]>",
  "to": ["<your-recipient-email>"],
  "replyTo": "<your-reply-to-email>",
  "subject": "<your-subject>",
  "html": "<p><your-html-content></p>"
}

Then run:

bash

bash -c 'curl -s -X POST "https://api.resend.com/emails" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

Send Scheduled Email

Schedule email using natural language or ISO 8601 format:

Write to /tmp/resend_request.json:

json

{
  "from": "Acme <[email protected]>",
  "to": ["<your-recipient-email>"],
  "subject": "<your-subject>",
  "html": "<p><your-html-content></p>",
  "scheduledAt": "in 1 hour"
}

Then run:

bash

bash -c 'curl -s -X POST "https://api.resend.com/emails" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

Send Batch Emails

Send up to 100 emails in a single request:

Write to /tmp/resend_request.json:

json

[
  {
    "from": "Acme <[email protected]>",
    "to": ["<your-recipient-1>"],
    "subject": "Hello 1",
    "html": "<p>Email 1</p>"
  },
  {
    "from": "Acme <[email protected]>",
    "to": ["<your-recipient-2>"],
    "subject": "Hello 2",
    "html": "<p>Email 2</p>"
  }
]

Then run:

bash

bash -c 'curl -s -X POST "https://api.resend.com/emails/batch" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

Retrieve Email

bash

bash -c 'curl -s "https://api.resend.com/emails/<your-email-id>" --header "Authorization: Bearer $RESEND_API_KEY"'

List Sent Emails

bash

bash -c 'curl -s "https://api.resend.com/emails" --header "Authorization: Bearer $RESEND_API_KEY"'

Cancel Scheduled Email

bash

bash -c 'curl -s -X POST "https://api.resend.com/emails/<your-email-id>/cancel" --header "Authorization: Bearer $RESEND_API_KEY"'

Contacts

Create Contact

Write to /tmp/resend_request.json:

json

{
  "email": "<your-contact-email>",
  "firstName": "<your-first-name>",
  "lastName": "<your-last-name>",
  "unsubscribed": false
}

Then run:

bash

bash -c 'curl -s -X POST "https://api.resend.com/contacts" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

Create Contact with Custom Properties

Write to /tmp/resend_request.json:

json

{
  "email": "<your-contact-email>",
  "firstName": "<your-first-name>",
  "lastName": "<your-last-name>",
  "properties": {
    "company": "<your-company-name>",
    "role": "<your-role>"
  }
}

Then run:

bash

bash -c 'curl -s -X POST "https://api.resend.com/contacts" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

Retrieve Contact

bash

bash -c 'curl -s "https://api.resend.com/contacts/<your-contact-id>" --header "Authorization: Bearer $RESEND_API_KEY"'

List Contacts

bash

bash -c 'curl -s "https://api.resend.com/contacts" --header "Authorization: Bearer $RESEND_API_KEY"'

List Contacts with Pagination

bash

bash -c 'curl -s "https://api.resend.com/contacts?limit=50" --header "Authorization: Bearer $RESEND_API_KEY"'

Update Contact

Write to /tmp/resend_request.json:

json

{
  "firstName": "<your-new-first-name>",
  "unsubscribed": true
}

Then run:

bash

bash -c 'curl -s -X PATCH "https://api.resend.com/contacts/<your-contact-id>" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

Delete Contact

bash

bash -c 'curl -s -X DELETE "https://api.resend.com/contacts/<your-contact-id>" --header "Authorization: Bearer $RESEND_API_KEY"'

Domains

List Domains

bash

bash -c 'curl -s "https://api.resend.com/domains" --header "Authorization: Bearer $RESEND_API_KEY"'

Retrieve Domain

bash

bash -c 'curl -s "https://api.resend.com/domains/<your-domain-id>" --header "Authorization: Bearer $RESEND_API_KEY"'

Create Domain

Write to /tmp/resend_request.json:

json

{
  "name": "<your-domain-name>"
}

Then run:

bash

bash -c 'curl -s -X POST "https://api.resend.com/domains" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

Verify Domain

bash

bash -c 'curl -s -X POST "https://api.resend.com/domains/<your-domain-id>/verify" --header "Authorization: Bearer $RESEND_API_KEY"'

Delete Domain

bash

bash -c 'curl -s -X DELETE "https://api.resend.com/domains/<your-domain-id>" --header "Authorization: Bearer $RESEND_API_KEY"'

API Keys

List API Keys

bash

bash -c 'curl -s "https://api.resend.com/api-keys" --header "Authorization: Bearer $RESEND_API_KEY"'

Create API Key

Write to /tmp/resend_request.json:

json

{
  "name": "<your-key-name>"
}

Then run:

bash

bash -c 'curl -s -X POST "https://api.resend.com/api-keys" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

Create API Key with Permissions

Write to /tmp/resend_request.json:

json

{
  "name": "<your-key-name>",
  "permission": "sending_access"
}

Then run:

bash

bash -c 'curl -s -X POST "https://api.resend.com/api-keys" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

Delete API Key

bash

bash -c 'curl -s -X DELETE "https://api.resend.com/api-keys/<your-api-key-id>" --header "Authorization: Bearer $RESEND_API_KEY"'

Email Parameters Reference

Parameter	Type	Description
`from`	string	Sender email (required). Format: `"Name <[email protected]>"`
`to`	string[]	Recipients (required). Max 50 addresses
`subject`	string	Email subject (required)
`html`	string	HTML content
`text`	string	Plain text content
`cc`	string[]	CC recipients
`bcc`	string[]	BCC recipients
`replyTo`	string	Reply-to address
`scheduledAt`	string	Schedule time (ISO 8601 or natural language)
`tags`	array	Custom tags for tracking
`attachments`	array	File attachments (max 40MB total)

Response Codes

Status	Description
`200`	Success
`400`	Invalid parameters
`401`	Missing API key
`403`	Invalid API key
`404`	Resource not found
`429`	Rate limit exceeded (2 req/sec)
`5xx`	Server error

Guidelines

Rate Limits: Default is 2 requests per second; implement backoff for 429 errors
Sender Domain: Use verified domains for production; [email protected] for testing
Batch Emails: Use /emails/batch for sending to multiple recipients efficiently
Idempotency: Use Idempotency-Key header to prevent duplicate sends
Scheduling: Use natural language (in 1 hour) or ISO 8601 format for scheduledAt

API Reference

Documentation: https://resend.com/docs/api-reference/introduction
Dashboard: https://resend.com/overview
API Keys: https://resend.com/api-keys
Domains: https://resend.com/domains

Maintainer

majiayu000 Core maintainer

Source details

Full Name: majiayu000/claude-skill-registry
Branch: main
Path in repo: skills/other/other/resend-neversight-skills-feed
License: MIT License

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Install this agent skill to your Project

SKILL.md

Resend Email API

When to Use

Prerequisites

Emails

Send Email

Send Email with Plain Text

Send Email with CC/BCC

Send Email with Reply-To

Send Scheduled Email

Send Batch Emails

Retrieve Email

List Sent Emails

Cancel Scheduled Email

Contacts

Create Contact

Create Contact with Custom Properties

Retrieve Contact

List Contacts

List Contacts with Pagination

Update Contact

Delete Contact

Domains

List Domains

Retrieve Domain

Create Domain

Verify Domain

Delete Domain

API Keys

List API Keys

Create API Key

Create API Key with Permissions

Delete API Key

Email Parameters Reference

Response Codes

Guidelines

API Reference

Recommended Agent Skills

agent-ops-spec

agent-ops-state

agent-ops-spec

agent-ops-testing

agent-ops-testing

agent-ops-state