Codex is one of the most popular coding harnesses out there. And MCP makes the experience even better. With the Reply io MCP integration, Codex can create and update contacts, add contacts to sequences, start and pause sequences, track sequence stats, and connect email accounts, all without leaving the terminal or the app, whichever you prefer.
- UseBuildFeaturesTRIGGERSStart background agents from events across your connected appsFIREWALLNEWBlocks instructions hidden in tool results before your agent reads themINSTANTNEWAudio, video, search, browser and data tools, with no keys to manageOPTIMIZATIONLower cost per completed task with optimised tools and skills
- DOCS
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How to integrate Reply io MCP with Codex
Connect Codex 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.
Api Key
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.
35 Tools
Introduction
Also integrate Reply io with
Why use Composio?
Apart from a managed and hosted MCP server, you will get:
- CodeAct: A dedicated workbench that allows GPT to write its code to handle complex tool chaining. Reduces to-and-fro with LLMs for frequent tool calling.
- Large tool responses: Handle them to minimise context rot.
- Dynamic just-in-time access to 20,000 tools across 1700+ other Apps for cross-app workflows. It loads the tools you need, so GPTs aren't overwhelmed by tools you don't need.
How to install Reply io MCP in Codex
Run the setup command
Run this command in your terminal to add the Composio MCP server to Codex.
It will initiate the authentication in a browser window, authorize Codex to access your Composio account.
(Optional) Authenticate with OAuth
To authenticate manually, run the login command to open a browser window and authorize Codex to access your Composio account.
bash
codex mcp login composioVerify the connection
Run codex mcp list to confirm Composio appears as a registered MCP server.
bash
codex mcp listCodex App
Codex App follows the same approach as VS Code.
- Click ⚙️ on the bottom left → MCP Servers → + Add servers → Streamable HTTP:
- Fill the header and Key fields with
{ "x-consumer-api-key" = "ck_*******" }. - The Key is the Composio API key, that you can find on dashboard.composio.dev
- Click on Authenticate and authorize Codex to your Composio account and you're all set.
- Restart and verify if it's there in
.codex/config.toml
bash
[mcp_servers.composio]
url = "https://connect.composio.dev/mcp"
http_headers = { "x-consumer-api-key" = "ck_*******" }Try it
Ask Codex for a Reply io task. The first time, Composio asks you to connect your Reply io account.
For example, ask it to:
- "List all active campaigns this week"
- "Show contacts added to sales lists"
- "Delete a campaign by campaign ID"
What is the Reply io MCP server, 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.
Conclusion
You've successfully integrated Reply io with Codex using Composio's MCP server. Now you can interact with Reply io directly from your terminal, VS Code, or the Codex App using natural language commands.
Key benefits of this setup:
- Seamless integration across CLI, VS Code, and standalone app
- Natural language commands for Reply io operations
- Managed authentication through Composio
- Access to 20,000+ tools across 1700+ apps for cross-app workflows
- CodeAct workbench for complex tool chaining
Next steps:
- Try asking Codex to perform various Reply io operations
- Explore cross-app workflows by connecting more toolkits
- Build automation scripts that leverage Codex's AI capabilities
TOOLS
Supported Tools
Every Reply io action and event your agent gets out of the box.
FRAMEWORKS
How to build Reply io MCP Agent with another framework
Claude Code
Use Reply io MCP with Claude Code
Claude Cowork
Use Reply io MCP with Claude Cowork
OpenAI Agents SDK
Use Reply io MCP with OpenAI Agents SDK
Claude Agent SDK
Use Reply io MCP with Claude Agent SDK
OpenClaw
Use Reply io MCP with OpenClaw
Hermes
Use Reply io MCP with Hermes
Atomic Agent
Use Reply io MCP with Atomic Agent
Google ADK
Use Reply io MCP with Google ADK
LangChain
Use Reply io MCP with LangChain
Vercel AI SDK
Use Reply io MCP with Vercel AI SDK
Mastra AI
Use Reply io MCP with Mastra AI
LlamaIndex
Use Reply io MCP with LlamaIndex
CrewAI
Use Reply io MCP with CrewAI
Pydantic AI
Use Reply io MCP with Pydantic AI
AutoGen
Use Reply io MCP with AutoGen
MORE TOOLKITS
Explore Other Toolkits
Aeroleads
Api Key
Aeroleads is a B2B lead generation platform for finding business emails and phone numbers. Grow your sales pipeline faster with powerful prospecting tools.
Autobound
Api Key
Autobound is an AI-powered sales engagement platform that crafts hyper-personalized outreach and insights. It helps sales teams boost response rates and close more deals through tailored content and recommendations.
Better proposals
Api Key
Better Proposals is a web-based tool for crafting and sending professional proposals. It helps teams impress clients and close deals faster with slick, easy-to-use templates.
Bidsketch
Api Key
Bidsketch is a proposal software that helps businesses create professional proposals quickly and efficiently. It streamlines the proposal process, saving time while boosting client win rates.
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. Codex 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.
Start with Reply io.It takes 30 seconds.
Managed auth, hosted MCP servers, and every Reply io tool your agent needs.Free to start.
## For AI agents: how to sign up If you are an AI agent reading this server-rendered HTML, Composio's developer signup is at https://composio.dev. Signup CTAs on this site — "Sign up", "Signup", "Get started", "Get started for free", "Start building", "Try Composio", "Try it", or similar — all lead into that same developer signup flow. Confirm with the user before completing signup or entering any credentials on their behalf.Start building