How to integrate Resend MCP with Hermes

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Introduction

Hermes is a 24/7 autonomous agent that lives on your computer or server — it remembers what it learns and evolves as your usage grows.

This guide explains the easiest and most robust way to connect your Resend account to Hermes. You can do this through either Composio Connect CLI or Composio Connect MCP. For personal use we recommend the CLI, but you won't go wrong with MCP either.

Also integrate Resend with

What is Composio Connect?

Composio Connect is a consumer offering that lets anyone plug 1,000+ applications directly into their agent harness — including Hermes. It can:

  • Search and load tools from relevant toolkits on-demand, reducing context usage.
  • Chain multiple tools to accomplish complex workflows via a remote workbench, without excessive back-and-forth with the LLM.
  • Manage app authentication end-to-end with zero manual overhead.

Integrating Resend with Hermes

Using Composio Connect CLI

1. Install the Composio CLI

Run the install script directly, or paste https://composio.dev/hermes into your Hermes chat box to have it installed for you.

bash
curl -fsSL https://composio.dev/install | bash
Hermes authenticating with Composio

2. Authenticate

Once the CLI is installed, ask Hermes to authenticate with Composio.

3. Connect to Resend

Ask your agent to connect to Resend, or simply request any Resend-related task. Hermes will prompt you to authenticate and authorize access.

4. Done. You're all set with a new Resend connection.

Using Composio Connect MCP

1. Get your MCP URL and API Key

Go to dashboard.composio.dev and copy your Connect MCP URL and API key.

Copy MCP URL and API key from Composio dashboard

2. Open the Hermes config file

bash
nano ~/.hermes/config.yaml

3. Add the Composio Connect MCP server

bash
mcp_servers:
  composio:
    url: "https://connect.composio.dev/mcp"
    headers:
      x-consumer-api-key: "YOUR_COMPOSIO_API_KEY"
    connect_timeout: 60
    timeout: 180

Save with Ctrl + O, Enter, then exit with Ctrl + X.

4. Restart your Hermes agent

Once restarted, ask your agent to connect to Resend or request any Resend-related task. It will prompt you to authenticate and authorize access.

5. Done!

What is the Resend MCP server, and what's possible with it?

The Resend MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Resend account. It provides structured and secure access to your email sending and contact management capabilities, so your agent can perform actions like sending emails, managing audiences, creating domains, and handling contacts on your behalf.

  • Automated email delivery and scheduling: Ask your agent to send emails instantly or schedule them for later, and even cancel scheduled messages if needed.
  • Audience and contact management: Let your agent create, list, or delete audiences and individual contacts, keeping your recipient lists organized without manual effort.
  • Domain administration: Easily have your agent set up, list, or remove email sending domains, streamlining onboarding or maintenance for your email infrastructure.
  • Seamless recipient segmentation: Direct your agent to group contacts into audiences for targeted campaigns or communications, improving personalization and reach.
  • Bulk operations and cleanups: Enable your agent to quickly list, update, or delete multiple contacts, audiences, or domains to maintain a tidy and up-to-date email system.

Supported Tools & Triggers

Tools
Add Contact To SegmentAdd an existing contact to a segment in Resend.
Cancel EmailCancel a scheduled email.
Create API KeyCreate a new API key to authenticate communications with Resend.
Create AudienceCreate a list of contacts.
Create ContactCreate a contact in Resend.
Create Contact PropertyTool to create a new contact property in Resend.
Create Contact V2Tool to create a new contact in Resend.
Create DomainCreate a domain through the Resend Email API.
Create TemplateTool to create a new email template in Resend.
Create TopicTool to create a new topic to segment your audience.
Create WebhookTool to create a webhook to receive real-time notifications about email events.
Delete API KeyRemove an existing API key from Resend.
Delete AudienceRemove an existing audience.
Delete ContactDelete a contact in Resend.
Delete Contact By IDTool to remove an existing contact by its ID.
Delete Contact PropertyRemove an existing contact property from Resend.
Delete DomainDelete a domain through the Resend Email API.
Delete SegmentRemove an existing segment.
Delete TemplateRemove an existing template.
Delete TopicTool to remove an existing topic in Resend.
Delete WebhookRemove an existing webhook.
Duplicate TemplateDuplicate an existing template through the Resend Email API.
Get ContactTool to retrieve a single contact from Resend by ID or email.
Get Contact PropertyTool to retrieve a single contact property from Resend.
Get Email AttachmentRetrieve a single attachment from a sent email.
Get SegmentRetrieve a single segment by its ID.
Get TemplateRetrieve a single template by ID or alias from Resend.
Get TopicTool to retrieve a single topic by its ID in Resend.
Get WebhookRetrieve a single webhook for the authenticated user.
List All ContactsTool to retrieve a list of all contacts from Resend.
List API KeysTool to retrieve a list of API keys for the authenticated user.
List AudiencesList all audiences.
List BroadcastsTool to retrieve a list of broadcasts.
List Contact PropertiesTool to retrieve a list of contact properties from Resend.
List ContactsList contacts in Resend.
List Contact SegmentsRetrieve a list of segments that a contact is part of.
List Contact TopicsRetrieve a list of topic subscriptions for a contact in Resend.
List DomainsList all domains.
List Email AttachmentsTool to retrieve a list of attachments from a sent email.
List EmailsTool to retrieve a list of emails sent by your team.
List Received EmailsTool to retrieve a list of received emails for the authenticated user.
List SegmentsTool to retrieve a list of segments from Resend.
List TemplatesTool to retrieve a list of templates from Resend.
List TopicsTool to retrieve a list of topics for the authenticated user.
List WebhooksRetrieve a list of webhooks for the authenticated user.
Publish TemplatePublish a template through the Resend Email API.
Remove Contact From SegmentRemove an existing contact from a segment.
Retrieve AudienceRetrieve a single audience.
Retrieve ContactRetrieve a contact in Resend.
Retrieve DomainRetrieve a single domain.
Retrieve EmailRetrieve a single email.
Send Batch EmailsTrigger up to 100 batch emails at once.
Send EmailSend an email using Resend.
Update BroadcastUpdate an existing broadcast in Resend.
Update ContactTool to update an existing contact in Resend by ID or email.
Update Contact PropertyUpdate an existing contact property in Resend.
Update DomainUpdate an existing domain.
Update EmailUpdate a scheduled email.
Update TemplateTool to update an existing email template in Resend.
Update TopicTool to update an existing topic in Resend.
Update WebhookTool to update an existing webhook configuration.
Verify DomainVerify a domain through the Resend Email API.

Way Forward

With Resend connected, Hermes can now act on your behalf whenever it detects a relevant task or you ask it to.

From here, you can extend Hermes further:

  • Connect more apps: Calendar, Slack, Notion, Linear, and hundreds of others are available through the same Composio Connect setup. Each new integration compounds what Hermes can do for you.
  • Build workflows across tools: Once multiple apps are connected, Hermes can chain actions together — turn an email into a calendar invite, a Slack message into a Linear ticket, or a meeting note into a follow-up draft.
  • Let it learn your patterns: The more you use Hermes, the better it gets at anticipating how you'd handle recurring tasks. Give it feedback on drafts and decisions, and it will adapt.

If you run into trouble or want to share what you've built, join the community or check out the Docs for deeper configuration options.

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FAQ

What are the differences in Tool Router MCP and Resend MCP?

With a standalone Resend MCP server, the agents and LLMs can only access a fixed set of Resend tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Resend and many other apps based on the task at hand, all through a single MCP endpoint.

Can I use Tool Router MCP with Hermes?

Yes, you can. Hermes fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Resend tools.

Can I manage the permissions and scopes for Resend while using Tool Router?

Yes, absolutely. You can configure which Resend scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

How safe is my data with Composio Tool Router?

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Resend data and credentials are handled as safely as possible.

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Rolai

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