kitsune-den/skulk-skills/gmail

Claude Code and agent skill by kitsune-den/skulk-skills

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Gmail API integration with managed OAuth. Read, send, and manage emails, threads, labels, and drafts. Use this skill when users want to interact with Gmail. For other third party apps, use the api-gateway skill (https://clawhub.ai/byungkyu/api-gateway).

Install

npx vskill@latest install kitsune-den/skulk-skills/gmail

SKILL.md

The same SKILL.md was published earlier as craftos-dev/craftbot/gmail.

Gmail

Access the Gmail API with managed OAuth authentication. Read, send, and manage emails, threads, labels, and drafts.

Quick Start

bash
# List messages
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/google-mail/gmail/v1/users/me/messages?maxResults=10')
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/google-mail/{native-api-path}

Replace {native-api-path} with the actual Gmail API endpoint path. The gateway proxies requests to gmail.googleapis.com and automatically injects your OAuth token.

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 Google OAuth 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=google-mail&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': 'google-mail'}).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": "21fd90f9-5935-43cd-b6c8-bde9d915ca80",
    "status": "ACTIVE",
    "creation_time": "2025-12-08T07:20:53.488460Z",
    "last_updated_time": "2026-01-31T20:03:32.593153Z",
    "url": "https://connect.maton.ai/?session_token=...",
    "app": "google-mail",
    "metadata": {}
  }
}

Open the returned url in a browser to complete OAuth authorization.

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 Gmail 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/google-mail/gmail/v1/users/me/messages')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Maton-Connection', '21fd90f9-5935-43cd-b6c8-bde9d915ca80')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

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

API Reference

List Messages
bash
GET /google-mail/gmail/v1/users/me/messages?maxResults=10

With query filter:

bash
GET /google-mail/gmail/v1/users/me/messages?q=is:unread&maxResults=10
Get Message
bash
GET /google-mail/gmail/v1/users/me/messages/{messageId}

With metadata only:

bash
GET /google-mail/gmail/v1/users/me/messages/{messageId}?format=metadata&metadataHeaders=From&metadataHeaders=Subject&metadataHeaders=Date
Send Message
bash
POST /google-mail/gmail/v1/users/me/messages/send
Content-Type: application/json
 
{
  "raw": "BASE64_ENCODED_EMAIL"
}
List Labels
bash
GET /google-mail/gmail/v1/users/me/labels
List Threads
bash
GET /google-mail/gmail/v1/users/me/threads?maxResults=10
Get Thread
bash
GET /google-mail/gmail/v1/users/me/threads/{threadId}
Modify Message Labels
bash
POST /google-mail/gmail/v1/users/me/messages/{messageId}/modify
Content-Type: application/json
 
{
  "addLabelIds": ["STARRED"],
  "removeLabelIds": ["UNREAD"]
}
Trash Message
bash
POST /google-mail/gmail/v1/users/me/messages/{messageId}/trash
Create Draft
bash
POST /google-mail/gmail/v1/users/me/drafts
Content-Type: application/json
 
{
  "message": {
    "raw": "BASE64URL_ENCODED_EMAIL"
  }
}
Send Draft
bash
POST /google-mail/gmail/v1/users/me/drafts/send
Content-Type: application/json
 
{
  "id": "{draftId}"
}
Get Profile
bash
GET /google-mail/gmail/v1/users/me/profile

Query Operators

Use in the q parameter:

  • is:unread - Unread messages
  • is:starred - Starred messages
  • from:email@example.com - From specific sender
  • to:email@example.com - To specific recipient
  • subject:keyword - Subject contains keyword
  • after:2024/01/01 - After date
  • before:2024/12/31 - Before date
  • has:attachment - Has attachments

Code Examples

JavaScript
javascript
const response = await fetch(
  'https://gateway.maton.ai/google-mail/gmail/v1/users/me/messages?maxResults=10',
  {
    headers: {
      'Authorization': `Bearer ${process.env.MATON_API_KEY}`
    }
  }
);
Python
python
import os
import requests
response = requests.get(
    'https://gateway.maton.ai/google-mail/gmail/v1/users/me/messages',
    headers={'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}'},
    params={'maxResults': 10, 'q': 'is:unread'}
)

Notes

  • Use me as userId for the authenticated user
  • Message body is base64url encoded in the raw field
  • Common labels: INBOX, SENT, DRAFT, STARRED, UNREAD, TRASH
  • IMPORTANT: When using curl commands, use curl -g when URLs contain brackets (fields[], sort[], records[]) to disable glob parsing
  • IMPORTANT: When piping curl output to jq or other commands, environment variables like $MATON_API_KEY may not expand correctly in some shell environments. You may get "Invalid API key" errors when piping.

Error Handling

StatusMeaning
400Missing Gmail connection
401Invalid or missing Maton API key
429Rate limited (10 req/sec per account)
4xx/5xxPassthrough error from Gmail 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: Invalid App Name
  1. Ensure your URL path starts with google-mail. For example:
  • Correct: https://gateway.maton.ai/google-mail/gmail/v1/users/me/messages
  • Incorrect: https://gateway.maton.ai/gmail/v1/users/me/messages

Resources

Security

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