How to connect Reply io to Claude

Connect Claude Web, Desktop and Cowork to Reply io MCP. List all active campaigns this week, show contacts added to sales lists, and more using natural language, with authentication handled for you.

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Reply.io is an AI-powered sales engagement platform for automating sales outreach across multiple channels. Boosts lead conversion and sales productivity through integrated workflows.

33 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 Reply io account to Claude via Composio Connect, enabling it to list all active campaigns this week, show contacts added to sales lists, delete a campaign by campaign ID, 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.

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Connecting Reply io 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 Reply io account

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

For example, ask Claude to:

  • "List all active campaigns this week"
  • "Show contacts added to sales lists"
  • "Delete a campaign by campaign ID"

It will prompt you to authenticate and authorize access.

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

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

The Reply 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 Reply io account. It provides structured and secure access to your sales engagement platform, so your agent can manage campaigns, handle contacts, organize sequences, and automate routine sales operations on your behalf.

  • Campaign and sequence management: Effortlessly list, browse, and delete campaigns or sequences to keep your outreach organized and up to date.
  • Contact and list organization: Let your agent fetch, review, and organize your Reply io contacts and contact lists for targeted sales actions.
  • Email account administration: Retrieve all connected email accounts or remove outdated ones, making sure your sales tools stay streamlined.
  • User and access control: Easily remove users or generate unique identifiers for tasks, maintaining security and clarity in your team’s workflow.
  • Automated data retrieval: Quickly pull up paginated lists of campaigns, sequences, email accounts, or contact lists to inform your sales strategies and next steps.

Troubleshooting

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

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

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

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

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

  • 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 Reply io.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the Reply io authorization link not work?

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

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

4. Why do Reply io actions fail after they worked before?

The Reply io connection can expire or lose permission.

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

5. How do I switch to a different Reply io account?

Claude can manage the Reply io connection for you.

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

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

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

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click and click Clear cache.
  • If Reply io 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 Reply io.
TOOLS

Supported Tools

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

Add Contact to Sequence

Move an existing contact to a sequence in Reply.

Archive Sequence

Tool to archive a sequence.

Clear Contact Status

Tool to clear statuses from contacts.

Connect Exchange Account via OAuth

Tool to initiate OAuth connection for an Exchange email account.

Connect Gmail Account

Tool to initiate Gmail account connection via OAuth.

Create Contact

Tool to create a new contact in Reply.

Create Sequence Step

Tool to add a new step to an existing sequence.

Delete Contact

Tool to delete a contact.

Delete Email Account

Tool to delete a specific email account.

Delete Schedule

Tool to delete a schedule.

Delete Sequence

Tool to delete a sequence.

Delete User

Tool to delete a user.

Generate ULID

Generate ULID

Get Contact by ID

Tool to retrieve a contact by ID.

Get Contact Status

Tool to get contact status.

Get Current User

Tool to get the current authenticated user's ID.

Reply.io Get Disconnected Email Accounts

Tool to list email accounts that are currently disconnected due to authentication or connection errors.

Get Sequence By ID

Tool to retrieve detailed information about a sequence by its ID.

Get Sequence Contacts Extended

Tool to retrieve all contacts enrolled in a sequence with additional details.

Get Sequence Step by ID

Tool to retrieve details of a specific sequence step.

List Contacts Basic

Tool to list contacts.

Reply.io List Email Accounts

Tool to list all email accounts.

Reply.io List Lists

Tool to list all contact lists.

List Sequences

Tool to retrieve a paginated list of sequences.

List Sequence Steps

Tool to retrieve all steps in a sequence.

Pause Sequence

Tool to pause a running sequence.

Remove Contact From Sequence

Tool to remove a contact from a sequence.

Bulk Remove Contacts from Sequence

Tool to bulk remove multiple contacts from a sequence at once.

Search Contacts by Email

Tool to search contacts by email.

Set Contact Status

Tool to set the status of one or more contacts.

Start Sequence

Tool to start a sequence.

Update Contact

Tool to update an existing contact's information.

Update Email Account

Tool to update an existing email account with custom SMTP/IMAP settings.

FAQ

Frequently asked questions

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

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

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