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How to integrate Customer.io MCP with Hermes

Connect Hermes to Customer.io MCP. Add user to onboarding campaign now, create broadcast for new feature announcement, and more using natural language, with authentication handled for you.

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Customer.io MCP is a behavioral messaging platform for managing people, campaigns, broadcasts, and workspace configuration. Use it to automate targeted lifecycle messaging, personalize communications, and orchestrate campaigns at scale.

8 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 Customer.io 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 Customer.io MCP with

ChatGPT WorkClaude Cowork

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 Customer.io 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 Customer.io

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

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

5. Done!

What is the Customer.io MCP server, and what's possible with it?

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

Way Forward

With Customer.io 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 Customer.io MCP action and event your agent gets out of the box.

Cio auth status

Show the active authentication state.

Cio delete api

Delete a resource via the Customer.

Cio prime

Print LLM-ready instructions for using the Customer.

Cio read api

Read from the Customer.

Cio schema

Introspect the Customer.

Cio skills list

List available agent skills — task-specific instruction manuals maintained by Customer.

Cio skills read

Read the full content of a specific agent skill.

Cio write api

Write to the Customer.

FRAMEWORKS

How to build Customer.io MCP Agent with another framework

ChatGPT Work logo

ChatGPT Work

Use Customer.io MCP with ChatGPT Work

Claude Cowork logo

Claude Cowork

Use Customer.io MCP with Claude Cowork

FAQ

Frequently asked questions

With a standalone Customer.io MCP server, the agents and LLMs can only access a fixed set of Customer.io tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Customer.io 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 Customer.io tools.

Yes, absolutely. You can configure which Customer.io 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 Customer.io data and credentials are handled as safely as possible.

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