How to integrate Simplero MCP with Hermes

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 Simplero 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.

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19 Tools

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 Simplero 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.

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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 Simplero 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 Simplero

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

4. Done. You're all set with a new Simplero 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 Simplero or request any Simplero-related task. It will prompt you to authenticate and authorize access.

5. Done!

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

The Simplero MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Simplero account. It provides structured and secure access so your agent can perform Simplero operations on your behalf.

Way Forward

With Simplero 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.

TOOLS

Supported Tools

Every Simplero action and event your agent gets out of the box.

Add Tag to Contact

Tool to add a tag to a contact identified by email address.

Bulk Subscribe to List

Tool to add multiple subscribers to a list in a single asynchronous request (max 1,000 per request).

Create or Update Administrator

Tool to create a new administratorship or update an existing one with the same email.

Create or Update Contact

Tool to create a new contact or update an existing contact with the same email.

Find Contact By Email

Tool to find and retrieve a contact by email address.

Find Subscription By Email

Tool to find subscriptions for a specific list by email address.

Get Administrator By ID

Tool to retrieve a single administratorship by internal ID.

Get Administrators

Tool to retrieve all administratorships for the account.

Get Admin Roles

Tool to retrieve all available admin roles for the account including custom roles.

Get Async Request Status

Tool to check the status of an asynchronous API request.

Get Contact By ID

Tool to retrieve a JSON representation of a contact by internal ID.

Get Invoices

Tool to get invoice information with optional filtering by date and invoice number.

Get All Lists

Tool to retrieve all mailing lists configured in the account.

Get Products

Tool to list all products in the account.

Remove Administrator

Tool to delete an administratorship by ID.

Remove Tag from Contact

Tool to remove a tag from a contact identified by email address.

Subscribe to List

Tool to add a new subscriber to a specific mailing list.

Unsubscribe From List

Tool to unsubscribe a customer from a specific mailing list.

Update Contact Credentials

Tool to update a contact's login credentials including email, first name, and last name.

FAQ

Frequently asked questions

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

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 Simplero tools.

Yes, absolutely. You can configure which Simplero 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.

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 Simplero data and credentials are handled as safely as possible.

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