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How to integrate DeBounce MCP with Hermes

Connect Hermes to DeBounce MCP. Validate new signup email addresses, check deliverability for marketing leads, and more using natural language, with authentication handled for you.

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DeBounce is an email verification service for checking address validity, deliverability, and risk. It helps keep contact lists clean so your campaigns reach real inboxes.

4 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 DeBounce 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 DeBounce 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 DeBounce 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 DeBounce

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

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

5. Done!

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

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

Way Forward

With DeBounce 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 DeBounce action and event your agent gets out of the box.

Get Account Balance

Return the connected DeBounce account's remaining validation-credit balance.

Get API Usage

Return the aggregate number of DeBounce API validation calls in an inclusive date range.

Get Bulk Validation Status

Check progress for a bulk validation list created through the DeBounce Bulk API and return its result download URL when available.

Validate Email

Validate one email address with DeBounce and return its deliverability result, reason, and remaining credit balance.

FRAMEWORKS

How to build DeBounce MCP Agent with another framework

ChatGPT Work logo

ChatGPT Work

Use DeBounce MCP with ChatGPT Work

Claude Cowork logo

Claude Cowork

Use DeBounce MCP with Claude Cowork

FAQ

Frequently asked questions

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

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

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