Resend | Composio Docs

Overview

SLUG: RESEND

Description

The universal API for sending emails.

Authentication Details

API Key

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.

Select App

Navigate to Resend.

Configure Auth Config Settings

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

Create and Get auth config ID

Click “Create Resend Auth Config”. 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

1 from composio import Composio
2 
3 # Replace these with your actual values
4 resend_auth_config_id = "ac_YOUR_RESEND_CONFIG_ID" # Auth config ID created above
5 user_id = "0000-0000-0000"  # UUID from database/app
6 
7 composio = Composio()
8 
9 def 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": {"generic_api_key": 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 
27 connection_id = authenticate_toolkit(user_id, resend_auth_config_id)
28 
29 # You can verify the connection using:
30 connected_account = composio.connected_accounts.get(connection_id)
31 print(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

OpenAI (Python)

Anthropic (TypeScript)

Google (Python)

Vercel (TypeScript)

Python

1 from composio import Composio
2 from openai import OpenAI
3 import json
4 
5 openai = OpenAI()
6 composio = Composio()
7 
8 # User ID must be a valid UUID format
9 user_id = "0000-0000-0000"  # Replace with actual user UUID from your database
10 
11 tools = composio.tools.get(user_id=user_id, toolkits=["RESEND"])
12 
13 print("[!] Tools:")
14 print(json.dumps(tools))
15 
16 def 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 
33 invoke_llm()

Tool List

RESEND_SEND_EMAIL

Tool Name: Send Email

Description

Send an email using resend.

Action Parameters

bcc

string

from

stringRequired

headers

object

html

string

react

string

reply_to

string

scheduled_at

string

subject

stringRequired

text

string

stringRequired

Action Response

data

objectRequired

error

string

successful

booleanRequired

RESEND_CANCEL_EMAIL

Tool Name: Cancel Email

Description

Cancel a scheduled email.

Action Parameters

stringRequired

Action Response

data

objectRequired

error

string

successful

booleanRequired

RESEND_CREATE_AUDIENCE

Tool Name: Create Audience

Description

Create a list of contacts.

Action Parameters

name

stringRequired

Action Response

data

objectRequired

error

string

successful

booleanRequired

RESEND_CREATE_CONTACT

Tool Name: Create Contact

Description

Create a contact in resend.

Action Parameters

audienceId

stringRequired

firstName

string

lastName

string

unsubscribed

boolean

Action Response

data

objectRequired

error

string

successful

booleanRequired

RESEND_CREATE_DOMAIN

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

RESEND_DELETE_AUDIENCE

Tool Name: Delete Audience

Description

Remove an existing audience.

Action Parameters

audience_id

stringRequired

Action Response

data

objectRequired

error

string

successful

booleanRequired

RESEND_DELETE_CONTACT

Tool Name: Delete Contact

Description

Delete a contact in resend.

Action Parameters

audienceId

stringRequired

string

Action Response

data

objectRequired

error

string

successful

booleanRequired

RESEND_DELETE_DOMAIN

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

RESEND_LIST_AUDIENCES

Tool Name: List Audiences

Description

List all audiences.

Action Parameters

Action Response

data

array

error

string

object

stringDefaults to list

successful

booleanRequired

RESEND_LIST_CONTACTS

Tool Name: List Contacts

Description

List contacts in resend.

Action Parameters

audienceId

stringRequired

Action Response

data

array

error

string

object

string

successful

booleanRequired

RESEND_LIST_DOMAINS

Tool Name: List Domains

Description

List all domains.

Action Parameters

Action Response

data

objectRequired

error

string

successful

booleanRequired

RESEND_RETRIEVE_AUDIENCE

Tool Name: Retrieve Audience

Description

Retrieve a single audience.

Action Parameters

audience_id

stringRequired

Action Response

data

objectRequired

error

string

successful

booleanRequired

RESEND_RETRIEVE_CONTACT

Tool Name: Retrieve Contact

Description

Retrieve a contact in resend.

Action Parameters

audienceId

stringRequired

Action Response

data

objectRequired

error

string

successful

booleanRequired

RESEND_RETRIEVE_DOMAIN

Tool Name: Retrieve Domain

Description

Retrieve a single domain.

Action Parameters

domain_id

stringRequired

Action Response

data

objectRequired

error

string

successful

booleanRequired

RESEND_RETRIEVE_EMAIL

Tool Name: Retrieve Email

Description

Retrieve a single email.

Action Parameters

email_id

stringRequired

Action Response

data

objectRequired

error

string

successful

booleanRequired

RESEND_UPDATE_DOMAIN

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

RESEND_UPDATE_EMAIL

Tool Name: Update Email

Description

Update a scheduled email.

Action Parameters

stringRequired

scheduled_at

string

Action Response

data

objectRequired

error

string

successful

booleanRequired

RESEND_VERIFY_DOMAIN

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