Resend

Learn how to use Resend with Composio

Overview

SLUG: RESEND

Description

The universal API for sending emails.

Authentication Details

generic_api_key
stringRequired

Connecting to Resend

Create an auth config

Use the dashboard to create an auth config for the Resend toolkit. This allows you to connect multiple Resend accounts to Composio for agents to use.

1

Select App

Navigate to the Resend toolkit page and click “Setup Integration”.

2

Configure Auth Config Settings

Select among the supported auth schemes of and configure them here.

3

Create and Get auth config ID

Click “Create Integration”. After creation, copy the displayed ID starting with ac_. This is your auth config ID. This is not a sensitive ID — you can save it in environment variables or a database. This ID will be used to create connections to the toolkit for a given user.

Connect Your Account

Using API Key

1from composio import Composio
2
3# Replace these with your actual values
4resend_auth_config_id = "ac_YOUR_RESEND_CONFIG_ID" # Auth config ID created above
5user_id = "0000-0000-0000" # UUID from database/app
6
7composio = Composio()
8
9def authenticate_toolkit(user_id: str, auth_config_id: str):
10 # Replace this with a method to retrieve an API key from the user.
11 # Or supply your own.
12 user_api_key = input("[!] Enter API key")
13
14 connection_request = composio.connected_accounts.initiate(
15 user_id=user_id,
16 auth_config_id=auth_config_id,
17 config={"auth_scheme": "API_KEY", "val": user_api_key}
18 )
19
20 # API Key authentication is immediate - no redirect needed
21 print(f"Successfully connected Resend for user {user_id}")
22 print(f"Connection status: {connection_request.status}")
23
24 return connection_request.id
25
26
27connection_id = authenticate_toolkit(user_id, resend_auth_config_id)
28
29# You can verify the connection using:
30connected_account = composio.connected_accounts.get(connection_id)
31print(f"Connected account: {connected_account}")

Tools

Executing tools

To prototype you can execute some tools to see the responses and working on the Resend toolkit’s playground

Python
1from composio import Composio
2from openai import OpenAI
3import json
4
5openai = OpenAI()
6composio = Composio()
7
8# User ID must be a valid UUID format
9user_id = "0000-0000-0000" # Replace with actual user UUID from your database
10
11tools = composio.tools.get(user_id=user_id, toolkits=["RESEND"])
12
13print("[!] Tools:")
14print(json.dumps(tools))
15
16def invoke_llm(task = "What can you do?"):
17 completion = openai.chat.completions.create(
18 model="gpt-4o",
19 messages=[
20 {
21 "role": "user",
22 "content": task, # Your task here!
23 },
24 ],
25 tools=tools,
26 )
27
28 # Handle Result from tool call
29 result = composio.provider.handle_tool_calls(user_id=user_id, response=completion)
30 print(f"[!] Completion: {completion}")
31 print(f"[!] Tool call result: {result}")
32
33invoke_llm()

Tool List

Tool Name: Send Email

Description

Send an email using resend.

Action Parameters

bcc
string
cc
string
from
stringRequired
headers
object
html
string
react
string
reply_to
string
scheduled_at
string
subject
stringRequired
text
string
to
stringRequired

Action Response

data
objectRequired
error
string
successful
booleanRequired

Tool Name: Cancel Email

Description

Cancel a scheduled email.

Action Parameters

id
stringRequired

Action Response

data
objectRequired
error
string
successful
booleanRequired

Tool Name: Create Audience

Description

Create a list of contacts.

Action Parameters

name
stringRequired

Action Response

data
objectRequired
error
string
successful
booleanRequired

Tool Name: Create Contact

Description

Create a contact in resend.

Action Parameters

audienceId
stringRequired
email
stringRequired
firstName
string
lastName
string
unsubscribed
boolean

Action Response

data
objectRequired
error
string
successful
booleanRequired

Tool Name: Create Domain

Description

Create a domain through the resend email api.

Action Parameters

name
stringRequired
region
stringDefaults to us-east-1

Action Response

data
objectRequired
error
string
successful
booleanRequired

Tool Name: Delete Audience

Description

Remove an existing audience.

Action Parameters

audience_id
stringRequired

Action Response

data
objectRequired
error
string
successful
booleanRequired

Tool Name: Delete Contact

Description

Delete a contact in resend.

Action Parameters

audienceId
stringRequired
email
string
id
string

Action Response

data
objectRequired
error
string
successful
booleanRequired

Tool Name: Delete Domain

Description

Delete a domain through the resend email api.

Action Parameters

domain_id
stringRequired

Action Response

data
objectRequired
error
string
successful
booleanRequired

Tool Name: List Audiences

Description

List all audiences.

Action Parameters

Action Response

data
array
error
string
object
stringDefaults to list
successful
booleanRequired

Tool Name: List Contacts

Description

List contacts in resend.

Action Parameters

audienceId
stringRequired

Action Response

data
array
error
string
object
string
successful
booleanRequired

Tool Name: List Domains

Description

List all domains.

Action Parameters

Action Response

data
objectRequired
error
string
successful
booleanRequired

Tool Name: Retrieve Audience

Description

Retrieve a single audience.

Action Parameters

audience_id
stringRequired

Action Response

data
objectRequired
error
string
successful
booleanRequired

Tool Name: Retrieve Contact

Description

Retrieve a contact in resend.

Action Parameters

audienceId
stringRequired
id
stringRequired

Action Response

data
objectRequired
error
string
successful
booleanRequired

Tool Name: Retrieve Domain

Description

Retrieve a single domain.

Action Parameters

domain_id
stringRequired

Action Response

data
objectRequired
error
string
successful
booleanRequired

Tool Name: Retrieve Email

Description

Retrieve a single email.

Action Parameters

email_id
stringRequired

Action Response

data
objectRequired
error
string
successful
booleanRequired

Tool Name: Update Domain

Description

Update an existing domain.

Action Parameters

click_tracking
boolean
domain_id
stringRequired
open_tracking
boolean
tls
stringDefaults to opportunistic

Action Response

data
objectRequired
error
string
successful
booleanRequired

Tool Name: Update Email

Description

Update a scheduled email.

Action Parameters

id
stringRequired
scheduled_at
string

Action Response

data
objectRequired
error
string
successful
booleanRequired

Tool Name: Verify Domain

Description

Verify a domain through the resend email api.

Action Parameters

domain_id
stringRequired

Action Response

data
objectRequired
error
string
successful
booleanRequired