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How to connect Unione to Claude

Connect Claude Web, Desktop and Cowork to Unione MCP. Check your current unione email balance, cancel a scheduled email by job id, and more using natural language, with authentication handled for you.

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UniOne is an email delivery service with a flexible Web API and SMTP API for transactional and marketing emails. It streamlines reliable, scalable email sending for developers and businesses.

32 Tools

Introduction

Claude is Anthropic's AI assistant, available on the web, in the desktop app, and on mobile. Cowork is its agent for knowledge work, and it runs on all of those surfaces too. Connected to your apps, Claude can work with your files and services to accomplish complex tasks on your behalf.

This guide walks you through the easiest and most secure way to connect your Unione account to Claude via Composio Connect, enabling it to check your current UniOne email balance, cancel a scheduled email by job ID, list all sender domains and their status, and more such actions on your behalf without compromising your account security.

Setup is the same on Claude Web, Desktop, and Cowork, and you only need to do it once. The connector is tied to your account, so it's available in all three.

Also integrate Unione with

Claude CodeOpenAI Agents SDKClaude Agent SDKCodexOpenClawHermesAtomic AgentGoogle ADKLangChainVercel AI SDKMastra AILlamaIndexCrewAIPydantic AIAutoGen

Connecting Unione to Claude Web, Desktop, and Cowork

Two ways to add the Composio connector. Pick whichever you prefer.

1. Add with one click

Click the button. Claude opens with the Composio connector filled in. Click Add, then go to step 2.

Add to Claude

Add manually

In Claude Desktop, click Customize in the left sidebar, then select Connectors and click the + icon at the top.

Claude Desktop connectors screen with Add custom connector selected

Click Add custom connector and paste in the Composio MCP server URL:

bash
https://connect.composio.dev/mcp
Add custom connector dialog with Composio MCP server URL

2. Authorize in your browser

Click Connect. You'll be redirected to a browser window where you can authorize Composio to continue.

Composio authorization screen for Claude Web, Desktop, and Cowork

3. Connect your Unione account

Back in Claude, ask it to connect to Unione or give it any Unione-related task.

For example, ask Claude to:

  • "Check your current UniOne email balance"
  • "Cancel a scheduled email by job ID"
  • "List all sender domains and their status"

It will prompt you to authenticate and authorize access.

That's it. Composio's tools are now available in Claude, and your Unione account is ready to use.

What is the Unione Claude Connector, and what's possible with it?

The Unione MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Unione account. It provides structured and secure access to your Unione email delivery service, so your agent can send transactional or marketing emails, manage sending domains, monitor delivery events, check account balance, and automate email operations on your behalf.

  • Automated email sending and scheduling: Have your agent send transactional or marketing emails and even schedule deliveries right from your Unione account.
  • Domain verification and management: Easily manage sender domains, trigger domain verifications, and handle DNS/DKIM checks to keep your emails deliverable.
  • Event monitoring and export: Let your agent fetch specific email events, retrieve delivery metrics, or export comprehensive email event logs for auditing and analytics.
  • Account balance and plan checks: Quickly access your current email balance and subscription plan details, ensuring you stay within your sending limits.
  • Email job and pricing insights: Retrieve detailed information about specific email jobs and get up-to-date pricing for cost management before sending campaigns.

Troubleshooting

1. Why does Claude not use the Composio connector for Unione?

The connector can show as connected, but Claude must use it in each Unione conversation.

  • Click + at the lower left of the chat, or type /.
  • Hover Connectors.
  • Turn on Composio.
  • Ask Claude to connect to Unione again.

2. Why does Claude show an MCP server error before Unione connects?

Claude can show Couldn't reach the MCP server or Authorization with the MCP server failed when you add the connector for Unione.

  • Check that the connector URL is https://connect.composio.dev/mcp.
  • Connectors run from Anthropic's cloud, so your device network is usually not the problem.
  • Add the connector again from Customize > Connectors, then ask Claude to connect Unione.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the Unione authorization link not work?

The Composio connector is one server. Your Unione account connects separately when Claude asks for it.

  • If the browser does not open, or the link expires, ask Claude to retry the Unione connection.
  • Composio creates a fresh Unione authorization link.
  • Open that link in your browser and finish the Unione sign-in.

4. Why do Unione actions fail after they worked before?

The Unione connection can expire or lose permission.

  • Ask Claude to inspect the Unione connection.
  • If the connection is unhealthy, disconnect it when Claude prompts you.
  • Reconnect the Unione account and retry the action.
  • If Claude shows a permission prompt, approve it before Claude changes data in Unione.
  • If the action still fails with a permission error, check that the connected account has that permission in Unione itself.

5. How do I switch to a different Unione account?

Claude can manage the Unione connection for you.

  • Ask Claude to disconnect or delete the current Unione account.
  • Ask Claude to connect Unione again.
  • Open the new Composio authorization link for Unione.
  • Sign in with the other Unione account in the browser.
  • After the account connects, ask Claude to retry the Unione task.

6. Why is my Unione connection missing in Claude Desktop or on a Team plan?

The connector belongs to your Claude account, so your Unione connection works in Claude Web, Desktop, and Cowork.

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If Unione tools still do not appear, click ⋮, disconnect, remove the connector, and add it again.
  • On Team or Enterprise, an Owner or Primary Owner must enable the connector before you can connect Unione.
TOOLS

Supported Tools

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

Delete Event Dump

Tool to delete an event dump file and remove it from the queue or storage.

Delete Template

Tool to delete a template by ID.

Delete Webhook

Tool to delete a webhook event notification handler by its URL.

UniOne Email Balance

Tool to retrieve current account balance.

Cancel Scheduled Email

Tool to cancel a scheduled transactional email by its job ID.

UniOne Email Domain Management

Tool to manage sender domains in UniOne.

Get Email Event

Tool to retrieve details of a specific email event by its ID.

Get Email Send Job

Tool to retrieve detailed information about a specific email send job.

UniOne Email List (Export)

Tool to export email events within a specified time frame.

Resend Sent Email

Tool to resend a previously sent email by its job ID.

UniOne Email Resubscribe

Tool to resubscribe a recipient who previously unsubscribed.

Resume Paused Email

Tool to resume a paused transactional email by its job ID.

UniOne Email SMTP Configuration

Tool to retrieve SMTP server details and credentials.

UniOne Email Statistics

Tool to retrieve email sending statistics over a specified time range.

UniOne Email Unsubscribe

Tool to unsubscribe an email from future emails.

Batch Email Validation

Tool to validate multiple email addresses in a batch.

Remove Email from Suppression List

Tool to remove an email from the suppression list.

Retry Email Validation

Tool to retry an email validation request.

UniOne Email Webhook Types

Tool to retrieve supported email webhook event types.

Create Event Dump

Tool to create an asynchronous CSV event dump.

UniOne Event Dump List

Tool to retrieve the full list of event dumps.

Get Event Dump

Tool to retrieve the status and download URLs of an event dump.

Get Email Suppression Details

Tool to check if an email is suppressed and retrieve the reason and date.

Get Template

Tool to get template properties by ID.

Get Webhook Configuration

Tool to retrieve webhook configuration by its URL.

Schedule Email

Tool to schedule a transactional email up to 24 hours ahead.

Suppression List

Tool to return the suppression list since a given date.

Delete Tag

Tool to delete a specific tag.

UniOne Tag List

Tool to retrieve all user-defined tags.

UniOne Template List

Tool to list email templates.

Set Template

Tool to set or update an email template.

Set Webhook

Tool to set or edit a webhook event notification handler.

FRAMEWORKS

How to build Unione MCP Agent with another framework

Claude Code logo

Claude Code

Use Unione MCP with Claude Code

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Unione MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Unione MCP with Claude Agent SDK

Codex logo

Codex

Use Unione MCP with Codex

OpenClaw logo

OpenClaw

Use Unione MCP with OpenClaw

Hermes logo

Hermes

Use Unione MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Unione MCP with Atomic Agent

Google ADK logo

Google ADK

Use Unione MCP with Google ADK

LangChain logo

LangChain

Use Unione MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Unione MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Unione MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Unione MCP with LlamaIndex

CrewAI logo

CrewAI

Use Unione MCP with CrewAI

Pydantic AI logo

Pydantic AI

Use Unione MCP with Pydantic AI

AutoGen logo

AutoGen

Use Unione MCP with AutoGen

FAQ

Frequently asked questions

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

Yes, you can. Claude Cowork 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 Unione tools.

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

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