How to connect Reply to Claude Cowork

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Introduction

Cowork is Anthropic's AI agent for knowledge work. Think of it as Claude Code for everything else. It works autonomously with your computer, local files, and applications to accomplish complex tasks.

This guide walks you through the easiest and most secure way to connect your Reply account to Cowork via Composio Connect, enabling it to list all active email campaigns this week, get contacts in your 'Leads Q3' list, show all available email templates, and more such actions on your behalf without compromising your account security.

Also integrate Reply with

Connecting Reply to Claude Cowork

1. Open Customize

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

2. Add the Composio MCP server

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

3. 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 Cowork

4. Connect your Reply account

Back in Cowork, ask the agent to connect to Reply or give it any Reply-related task.

For example, ask Cowork to:

  • "List all active email campaigns this week"
  • "Get contacts in your 'Leads Q3' list"
  • "Show all available email templates"

It will prompt you to authenticate and authorize access.

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

What is Claude Cowork?

Claude Cowork is Anthropic's agent for general knowledge work. It can use your computer, files, and connected applications to complete longer-running tasks across your work tools.

With Composio Connect, Cowork can securely access apps like Reply through MCP without you sharing account credentials directly with the agent.

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

The Reply 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 create and manage lists, fetch campaign schedules, organize contacts, and monitor outreach performance for you.

  • Personal list creation and management: Easily instruct your agent to create, organize, or delete personal contact lists to streamline your outreach workflow.
  • Contact organization and retrieval: Have your agent fetch contacts within specific lists, helping you target and personalize campaigns more effectively.
  • Campaign and schedule insights: Ask your agent to retrieve all campaign schedules or see which campaigns a specific contact belongs to, giving you up-to-date visibility into your outreach pipeline.
  • Email account and template discovery: Let your agent pull a list of available email accounts or fetch your personal, team, and community templates for quick access while composing new campaigns.
  • Blacklist monitoring and management: Direct your agent to retrieve the full list of blacklisted domains and emails, so you can ensure compliance and maintain deliverability standards with ease.

Supported Tools & Triggers

Tools
Create Personal ListTool to add a new personal list on the people page.
Delete List By IDTool to delete a list by its id.
Get All ListsTool to retrieve all available people lists.
Get full blacklist of domains and emailsTool to retrieve the full list of blacklisted domains and emails.
Get all campaign schedulesTool to list all campaign schedules (default and user-created).
Get Campaigns For ContactTool to retrieve campaigns a contact belongs to by contact id.
Get Contacts in List by IDTool to retrieve contacts in a specific personal list.
Get Email AccountsTool to retrieve list of all email accounts in your reply.
Get List by IDTool to return a specific people list by its id.
Get templates listTool to retrieve a list of user, team, and community templates.
Mark Contact As FinishedTool to mark a specific contact by email or all contacts under a domain as finished in all campaigns.
Mark Contact as RepliedTool to mark a contact as replied in all campaigns by email or domain.
Move Contacts to ListsTool to move one or more contacts to specified lists.
Remove Domain from BlacklistTool to remove the specified domain from the blacklist.
Remove Email from BlacklistTool to remove the specified email from the blacklist.

How to build Reply MCP Agent with another framework

FAQ

What are the differences in Tool Router MCP and Reply MCP?

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

Can I use Tool Router MCP with Claude Cowork?

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 tools.

Can I manage the permissions and scopes for Reply while using Tool Router?

Yes, absolutely. You can configure which Reply 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.

How safe is my data with Composio Tool Router?

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 data and credentials are handled as safely as possible.

Used by agents from

Context
Letta
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Context
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glean
HubSpot
Agent.ai
Altera
DataStax
Entelligence
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Context
Letta
glean
HubSpot
Agent.ai
Altera
DataStax
Entelligence
Rolai

Never worry about agent reliability

We handle tool reliability, observability, and security so you never have to second-guess an agent action.