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Agent skill

Resend

by LeoYeAI in LeoYeAI/openclaw-master-skills

Resend API integration with managed authentication. An agent skill from LeoYeAI/openclaw-master-skills.

MITAuto-check passedBackend & APIs

Install Resend

skills CLI
$ npx skills add LeoYeAI/openclaw-master-skills --skill resend -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install LeoYeAI/openclaw-master-skills resend --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/LeoYeAI/openclaw-master-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/resend-api .claude/skills/resend && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
resend
GitHub stars
2.2k
Token cost
~5.1k tokens
SKILL.md length
620 words
Files
3
Skills in repo
1,235
Repo updated
First seen
Licence
MIT

At a glance

Resend API integration with managed authentication. An agent skill from LeoYeAI/openclaw-master-skills.

  • Works in 3 steps: Sign in or create an account at maton.ai → Go to maton.ai/settings → Copy your API key
  • Users want to send emails
  • SKILL.md covers Quick Start, Base URL, Authentication and Connection Management, plus 5 more sections
  • Calls python; reaches gateway.maton.ai and ctrl.maton.ai; needs MATON_API_KEY and API_KEY

What it does

Resend is an agent skill from LeoYeAI/openclaw-master-skills. Resend API integration with managed authentication. Send transactional emails, manage domains, contacts, templates, and broadcasts. Use this skill when users want to send emails, manage email templates, create contact lists, or set up email broadcasts. For other third party apps, use the api-gateway skill (https://clawhub.ai/byungkyu/api-gateway).

Its SKILL.md is about 5.1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `_meta.json`). Compatibility notes: Requires network access and valid Maton API key

It sits in Backend & APIs, covering Transactional email, Microservices and Authentication. It works with Resend. The repository describes itself as: 🧠 Curated collection of 1209+ best OpenClaw skills — weekly updated by MyClaw.ai. The licence is MIT.

When your agent uses it

  • Users want to send emails
  • Manage email templates
  • Create contact lists
  • Set up email broadcasts

Example prompts

  • “/resend”

Requirements

  • Python 3
  • A credential in MATON_API_KEY
  • A credential in YOUR_API_KEY
  • Compatibility (from SKILL.md): Requires network access and valid Maton API key

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

  1. Sign in or create an account at maton.ai
  2. Go to maton.ai/settings
  3. Copy your API key

What it can do on your machine

Read from SKILL.md and the folder at commit e5199b5. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • python

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Hosts in commands or code, which the agent is likely to contact:

    • gateway.maton.ai
    • ctrl.maton.ai
    • connect.maton.ai

    Also links to:

    • maton.ai
    • resend.com
    • discord.com

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names these keys or tokens, usually read from environment variables:

    • MATON_API_KEY
    • API_KEY

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

  • Compatibility

    Requires network access and valid Maton API key

    From compatibility in the SKILL.md frontmatter.

Context cost

Resend loads about 5.1k tokens when it runs. Until then it costs about 89 tokens; SKILL.md has 620 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~89
When it runs · the whole SKILL.md, loaded when a task matches
~5.1k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from LeoYeAI/openclaw-master-skills at commit e5199b5, republished under its MIT licence (© LeoYeAI). 620 words, ~5,129 tokens.

Download SKILL.mdSave it as .claude/skills/resend/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.
name
resend
description
Resend API integration with managed authentication. Send transactional emails, manage domains, contacts, templates, and broadcasts. Use this skill when users want to send emails, manage email templates, create contact lists, or set up email broadcasts. For other third party apps, use the api-gateway skill (https://clawhub.ai/byungkyu/api-gateway).
compatibility
Requires network access and valid Maton API key
metadata.author
maton
metadata.version
1.0

Resend

Access the Resend API with managed authentication. Send transactional emails, manage domains, contacts, templates, broadcasts, and webhooks.

Quick Start

bash
# List sent emails
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/resend/emails')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Base URL

https://gateway.maton.ai/resend/{endpoint}

The gateway proxies requests to api.resend.com and automatically injects your API key.

Authentication

All requests require the Maton API key in the Authorization header:

Authorization: Bearer $MATON_API_KEY

Environment Variable: Set your API key as MATON_API_KEY:

bash
export MATON_API_KEY="YOUR_API_KEY"
Getting Your API Key
  1. Sign in or create an account at maton.ai
  2. Go to maton.ai/settings
  3. Copy your API key

Connection Management

Manage your Resend connections at https://ctrl.maton.ai.

List Connections
bash
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections?app=resend&status=ACTIVE')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF
Create Connection
bash
python <<'EOF'
import urllib.request, os, json
data = json.dumps({'app': 'resend'}).encode()
req = urllib.request.Request('https://ctrl.maton.ai/connections', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF
Get Connection
bash
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections/{connection_id}')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

json
{
  "connection": {
    "connection_id": "528c8f70-23f4-46d5-bd9f-01d0d043e573",
    "status": "ACTIVE",
    "creation_time": "2026-03-13T00:19:36.809599Z",
    "last_updated_time": "2026-03-13T09:59:08.443568Z",
    "url": "https://connect.maton.ai/?session_token=...",
    "app": "resend",
    "metadata": {},
    "method": "API_KEY"
  }
}
Delete Connection
bash
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections/{connection_id}', method='DELETE')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF
Specifying Connection

If you have multiple Resend connections, specify which one to use with the Maton-Connection header:

bash
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/resend/emails')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Maton-Connection', '528c8f70-23f4-46d5-bd9f-01d0d043e573')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

If omitted, the gateway uses the default (oldest) active connection.

API Reference

Emails

Send and manage transactional emails.

Send Email
bash
POST /resend/emails

Example:

bash
python <<'EOF'
import urllib.request, os, json
data = json.dumps({
    'from': 'you@yourdomain.com',
    'to': ['recipient@example.com'],
    'subject': 'Hello from Resend',
    'html': '<p>Welcome to our service!</p>'
}).encode()
req = urllib.request.Request('https://gateway.maton.ai/resend/emails', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Request Body:

FieldTypeRequiredDescription
fromstringYesSender email (must be from verified domain)
tostring[]YesRecipient email addresses
subjectstringYesEmail subject
htmlstringNoHTML content
textstringNoPlain text content
ccstring[]NoCC recipients
bccstring[]NoBCC recipients
reply_tostring[]NoReply-to addresses
attachmentsobject[]NoFile attachments
tagsobject[]NoEmail tags for tracking
scheduled_atstringNoISO 8601 datetime for scheduled send

Response:

json
{
  "id": "a52ac168-338f-4fbc-9354-e6049b193d99"
}
Send Batch Emails
bash
POST /resend/emails/batch

Example:

bash
python <<'EOF'
import urllib.request, os, json
data = json.dumps([
    {'from': 'you@yourdomain.com', 'to': ['a@example.com'], 'subject': 'Email 1', 'text': 'Content 1'},
    {'from': 'you@yourdomain.com', 'to': ['b@example.com'], 'subject': 'Email 2', 'text': 'Content 2'}
]).encode()
req = urllib.request.Request('https://gateway.maton.ai/resend/emails/batch', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF
List Emails
bash
GET /resend/emails

Example:

bash
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/resend/emails')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

json
{
  "data": [
    {
      "id": "a52ac168-338f-4fbc-9354-e6049b193d99",
      "from": "you@yourdomain.com",
      "to": ["recipient@example.com"],
      "subject": "Hello from Resend",
      "created_at": "2026-03-13T10:00:00.000Z"
    }
  ]
}
Get Email
bash
GET /resend/emails/{email_id}

Example:

bash
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/resend/emails/{email_id}')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF
Update Email
bash
PATCH /resend/emails/{email_id}
Cancel Scheduled Email
bash
DELETE /resend/emails/{email_id}
Domains

Manage sending domains.

List Domains
bash
GET /resend/domains

Example:

bash
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/resend/domains')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

json
{
  "data": [
    {
      "id": "5eb93a2e-e849-40a1-81b7-ed0fb574ddd8",
      "name": "yourdomain.com",
      "status": "verified",
      "created_at": "2026-03-13T10:00:00.000Z"
    }
  ]
}
Create Domain
bash
POST /resend/domains

Example:

bash
python <<'EOF'
import urllib.request, os, json
data = json.dumps({'name': 'yourdomain.com'}).encode()
req = urllib.request.Request('https://gateway.maton.ai/resend/domains', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

json
{
  "id": "5eb93a2e-e849-40a1-81b7-ed0fb574ddd8",
  "name": "yourdomain.com",
  "status": "pending",
  "records": [
    {"type": "MX", "name": "...", "value": "..."},
    {"type": "TXT", "name": "...", "value": "..."}
  ]
}
Get Domain
bash
GET /resend/domains/{domain_id}
Update Domain
bash
PATCH /resend/domains/{domain_id}
Delete Domain
bash
DELETE /resend/domains/{domain_id}
Verify Domain
bash
POST /resend/domains/{domain_id}/verify
Contacts

Manage contact lists.

List Contacts
bash
GET /resend/contacts

Example:

bash
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/resend/contacts')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF
Create Contact
bash
POST /resend/contacts

Example:

bash
python <<'EOF'
import urllib.request, os, json
data = json.dumps({
    'email': 'contact@example.com',
    'first_name': 'John',
    'last_name': 'Doe'
}).encode()
req = urllib.request.Request('https://gateway.maton.ai/resend/contacts', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

json
{
  "id": "3cdc4bbb-0c79-46e5-be2a-48a89c29203d"
}
Get Contact
bash
GET /resend/contacts/{contact_id}
Update Contact
bash
PATCH /resend/contacts/{contact_id}
Delete Contact
bash
DELETE /resend/contacts/{contact_id}
Templates

Manage email templates.

List Templates
bash
GET /resend/templates

Example:

bash
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/resend/templates')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF
Create Template
bash
POST /resend/templates

Example:

bash
python <<'EOF'
import urllib.request, os, json
data = json.dumps({
    'name': 'Welcome Email',
    'subject': 'Welcome to our service!',
    'html': '<h1>Welcome!</h1><p>Thanks for signing up.</p>'
}).encode()
req = urllib.request.Request('https://gateway.maton.ai/resend/templates', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

json
{
  "id": "9b84737c-8a80-448a-aca1-c6e1fddd0f23"
}
Get Template
bash
GET /resend/templates/{template_id}
Update Template
bash
PATCH /resend/templates/{template_id}
Delete Template
bash
DELETE /resend/templates/{template_id}
Publish Template
bash
POST /resend/templates/{template_id}/publish
Duplicate Template
bash
POST /resend/templates/{template_id}/duplicate
Segments

Create audience segments for targeting.

List Segments
bash
GET /resend/segments

Example:

bash
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/resend/segments')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF
Create Segment
bash
POST /resend/segments

Example:

bash
python <<'EOF'
import urllib.request, os, json
data = json.dumps({
    'name': 'Active Users',
    'filter': {
        'and': [
            {'field': 'email', 'operator': 'contains', 'value': '@'}
        ]
    }
}).encode()
req = urllib.request.Request('https://gateway.maton.ai/resend/segments', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF
Get Segment
bash
GET /resend/segments/{segment_id}
Delete Segment
bash
DELETE /resend/segments/{segment_id}
Broadcasts

Send emails to segments.

List Broadcasts
bash
GET /resend/broadcasts

Example:

bash
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/resend/broadcasts')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF
Create Broadcast
bash
POST /resend/broadcasts

Example:

bash
python <<'EOF'
import urllib.request, os, json
data = json.dumps({
    'name': 'Weekly Newsletter',
    'from': 'newsletter@yourdomain.com',
    'subject': 'This Week\'s Update',
    'html': '<h1>Weekly Update</h1><p>Here\'s what happened...</p>',
    'segment_id': 'segment-uuid'
}).encode()
req = urllib.request.Request('https://gateway.maton.ai/resend/broadcasts', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF
Get Broadcast
bash
GET /resend/broadcasts/{broadcast_id}
Update Broadcast
bash
PATCH /resend/broadcasts/{broadcast_id}
Delete Broadcast
bash
DELETE /resend/broadcasts/{broadcast_id}
Send Broadcast
bash
POST /resend/broadcasts/{broadcast_id}/send
Webhooks

Configure event notifications.

List Webhooks
bash
GET /resend/webhooks

Example:

bash
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/resend/webhooks')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF
Create Webhook
bash
POST /resend/webhooks

Example:

bash
python <<'EOF'
import urllib.request, os, json
data = json.dumps({
    'endpoint': 'https://yoursite.com/webhook',
    'events': ['email.delivered', 'email.bounced', 'email.opened']
}).encode()
req = urllib.request.Request('https://gateway.maton.ai/resend/webhooks', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Webhook Events:

  • email.sent - Email was sent
  • email.delivered - Email was delivered
  • email.opened - Email was opened
  • email.clicked - Link in email was clicked
  • email.bounced - Email bounced
  • email.complained - Recipient marked as spam
Get Webhook
bash
GET /resend/webhooks/{webhook_id}
Update Webhook
bash
PATCH /resend/webhooks/{webhook_id}
Delete Webhook
bash
DELETE /resend/webhooks/{webhook_id}
API Keys

Manage API keys.

List API Keys
bash
GET /resend/api-keys

Example:

bash
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/resend/api-keys')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF
Show full SKILL.md (252 more words)Show less
Create API Key
bash
POST /resend/api-keys

Example:

bash
python <<'EOF'
import urllib.request, os, json
data = json.dumps({'name': 'Production Key'}).encode()
req = urllib.request.Request('https://gateway.maton.ai/resend/api-keys', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Note: The actual API key value is only returned once on creation.

Delete API Key
bash
DELETE /resend/api-keys/{api_key_id}
Topics

Manage subscription topics.

List Topics
bash
GET /resend/topics
Create Topic
bash
POST /resend/topics

Example:

bash
python <<'EOF'
import urllib.request, os, json
data = json.dumps({
    'name': 'Newsletter',
    'default_subscription': 'subscribed'
}).encode()
req = urllib.request.Request('https://gateway.maton.ai/resend/topics', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Note: default_subscription is required. Values: subscribed or unsubscribed.

Get Topic
bash
GET /resend/topics/{topic_id}
Update Topic
bash
PATCH /resend/topics/{topic_id}
Delete Topic
bash
DELETE /resend/topics/{topic_id}
Contact Properties

Manage custom contact properties.

List Contact Properties
bash
GET /resend/contact-properties
Create Contact Property
bash
POST /resend/contact-properties
Get Contact Property
bash
GET /resend/contact-properties/{property_id}
Update Contact Property
bash
PATCH /resend/contact-properties/{property_id}
Delete Contact Property
bash
DELETE /resend/contact-properties/{property_id}

Code Examples

JavaScript
javascript
// Send an email
const response = await fetch('https://gateway.maton.ai/resend/emails', {
  method: 'POST',
  headers: {
    'Authorization': `Bearer ${process.env.MATON_API_KEY}`,
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    from: 'you@yourdomain.com',
    to: ['recipient@example.com'],
    subject: 'Hello!',
    html: '<p>Welcome!</p>'
  })
});
const data = await response.json();
console.log(data.id);
Python
python
import os
import requests

response = requests.post(
    'https://gateway.maton.ai/resend/emails',
    headers={
        'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}',
        'Content-Type': 'application/json'
    },
    json={
        'from': 'you@yourdomain.com',
        'to': ['recipient@example.com'],
        'subject': 'Hello!',
        'html': '<p>Welcome!</p>'
    }
)
email = response.json()
print(f"Email sent: {email['id']}")

Notes

  • Sending emails requires a verified domain
  • Rate limit: 2 requests per second
  • Batch emails accept up to 100 emails per request
  • Scheduled emails can be set up to 7 days in advance
  • Attachments support base64 encoded content or URLs
  • The from address must use a verified domain
  • IMPORTANT: When piping curl output to jq or other commands, environment variables like $MATON_API_KEY may not expand correctly in some shell environments

Error Handling

StatusMeaning
400Bad request or missing Resend connection
401Invalid or missing Maton API key
403Domain not verified or permission denied
404Resource not found
422Validation error (missing required fields)
429Rate limited (2 req/sec)
4xx/5xxPassthrough error from Resend API
Troubleshooting: API Key Issues
  1. Check that the MATON_API_KEY environment variable is set:
bash
echo $MATON_API_KEY
  1. Verify the API key is valid by listing connections:
bash
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF
Troubleshooting: Domain Not Verified

To send emails, you must first add and verify a domain:

  1. Create a domain: POST /resend/domains
  2. Add the DNS records provided in the response
  3. Verify the domain: POST /resend/domains/{id}/verify

Resources

© LeoYeAI, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 2 other files in skills/resend-api of LeoYeAI/openclaw-master-skills.

  • SKILL.md
  • LICENSE.txt
  • _meta.json

Open the folder on GitHubat commit e5199b5

Compare with similar skills

Resend next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Resend compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Resend this skillLeoYeAI/openclaw-master-skills2.2k—~5.1kAutomated safety check: PassMIT
Send Emailviclafouch/meme-studio1102 repos~3.8kAutomated safety check: PassNone
Reading Mailcatcher APIbitwarden/ai-plugins154—~2.3kAutomated safety check: PassCustom licence
API Security Designvinayaklatthe/microsoft-security-skills175—~2.2kAutomated safety check: PassMIT
Email Systemgjovanovicst/golang-auth-api130—~1.7kAutomated safety check: PassMIT
.NET Core ExpertJeffallan/claude-skills12k—~1.3kAutomated safety check: PassMIT

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Works with

Categories

Questions about Resend

What does Resend do?

Resend API integration with managed authentication. An agent skill from LeoYeAI/openclaw-master-skills. Resend is an agent skill from LeoYeAI/openclaw-master-skills. Resend API integration with managed authentication.

When should I use Resend?

Resend fits situations like: users want to send emails; manage email templates; create contact lists; set up email broadcasts.

How do I install Resend in Claude Code?

Run `npx skills add LeoYeAI/openclaw-master-skills --skill resend -a claude-code`. Or copy the skill folder (skills/resend-api in LeoYeAI/openclaw-master-skills) into .claude/skills/resend in your project. Claude Code loads it when a task matches its description.

How do I install Resend in Codex?

Run `npx skills add LeoYeAI/openclaw-master-skills --skill resend -a codex`. Or copy the skill folder (skills/resend-api in LeoYeAI/openclaw-master-skills) into .agents/skills/resend in your project. Codex loads it when a task matches its description.

Can I use Resend in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add LeoYeAI/openclaw-master-skills --skill resend -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/resend, .gemini/skills/resend, .github/skills/resend and .opencode/skills/resend in your project.

What does Resend need to run?

Going by SKILL.md and its folder, Resend needs the command-line tools its instructions call (python) and credentials named MATON_API_KEY and API_KEY. Our summary lists: Python 3; A credential in MATON_API_KEY; A credential in YOUR_API_KEY. Compatibility (from SKILL.md): Requires network access and valid Maton API key.

Does Resend access the network?

SKILL.md names 6 domains. In commands or code: gateway.maton.ai, ctrl.maton.ai and connect.maton.ai; the agent is likely to contact these when it follows the instructions. As links in the text: maton.ai, resend.com and discord.com. This is read from the text; nothing was executed.

Is Resend safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Resend use?

Resend is published under the MIT licence (from the LICENSE file in the skill folder). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Resend use?

About 5.1k tokens (SKILL.md is roughly 21k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Resend?

Skills that share tags, products or a category with Resend: Send Email (viclafouch/meme-studio, 110 stars), Reading Mailcatcher API (bitwarden/ai-plugins, 154 stars), API Security Design (vinayaklatthe/microsoft-security-skills, 175 stars) and Email System (gjovanovicst/golang-auth-api, 130 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Resend?

LeoYeAI (a GitHub user) maintains it in LeoYeAI/openclaw-master-skills, which has 2,160 GitHub stars. The repository holds 1,235 skills in this directory. The repository was last updated on July 20, 2026.

Source: LeoYeAI/openclaw-master-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.