Use
COMPOSIOFOR YOU
Give Claude, Codex, or any harness secure access to 1700+ tools
CLI
One command to add tools and auth to your coding agent
Build
DEVELOPER PLATFORM
SDKs, tools, and auth for agents and backend apps
MCP GATEWAY
One managed MCP endpoint for all your tools and agents
ENTERPRISE
SSO, governance, and audit controls for deploying agents org-wide
Features
TRIGGERS
Start background agents from events across your connected apps
FIREWALLNEW
Blocks instructions hidden in tool results before your agent reads them
INSTANTNEW
Audio, video, search, browser and data tools, with no keys to manage
OPTIMIZATION
Lower cost per completed task with optimised tools and skills
FOR AGENTS
CLAUDE CODEX OPENCLAW CURSOR HERMES
BUILT FOR
OFFICE WORK SALES MARKETING PRODUCT & DESIGN CUSTOMER SUPPORT ENGINEERING HR & RECRUITING FINANCE & OPS E-COMMERCE CONTENT & MEDIA IT & SECURITY
ALL USE CASES
DOCS

How to integrate Missive MCP with Codex

Connect Codex to Missive MCP. List all team members for marketing, create a draft email for client follow-up, and more using natural language, with authentication handled for you.

Get started for free Get a demo

Missive

Api Key

Missive is a collaborative email and chat app for teams to manage conversations and tasks together. It helps streamline team inboxes, shared labels, and internal discussion in one place.

40 Tools

Managed auth

Connect Missive without auth hassles

We manage OAuth, API keys, token refresh, and scopes — you just build.

Book a call

Explore the MCP Gateway

Introduction

Codex is one of the most popular coding harnesses out there. And MCP makes the experience even better. With the Missive MCP integration, Codex can create drafts and posts, list conversations and messages, manage contacts, create tasks, and organize shared labels, all without leaving the terminal or the app, whichever you prefer.

For exact tool slugs and parameter tables, see the tool catalog in the Composio docs.

Also integrate Missive with

Claude Code Claude Cowork OpenAI Agents SDK Claude Agent SDK OpenClaw Hermes Atomic Agent Google ADK LangChain Vercel AI SDK Mastra AI LlamaIndex CrewAI Pydantic AI AutoGen

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 Missive MCP in Codex

Run the setup command

Run this command in your terminal to add the Composio MCP server to Codex.

Terminal

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 composio

Verify the connection

Run codex mcp list to confirm Composio appears as a registered MCP server.

bash

codex mcp list

Codex 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 Missive task. The first time, Composio asks you to connect your Missive account.

For example, ask it to:

"List all team members for marketing"
"Create a draft email for client follow-up"
"Send a chat message in project conversation"

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

The Missive MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Missive account. It provides structured and secure access to your team's shared inboxes and chat threads, so your agent can perform actions like drafting emails, sending messages, generating reports, and managing team communication on your behalf.

Automated message drafting and scheduling: Let your agent create and save email, SMS, WhatsApp, or live chat drafts for later editing or scheduled sending.
Instant message sending in conversations: Have your agent send new messages directly to any Missive conversation, keeping your team in the loop in real time.
Team and user management: Effortlessly list all teams and their members, or pull a full directory of users in your Missive organization for easy coordination and task assignment.
Analytics report generation: Direct your agent to create detailed analytics reports across time ranges and filters, helping your team track productivity and engagement.
Webhook automation setup: Enable your agent to create or delete webhook subscriptions, so you can automate notifications and integrations with other tools as needed.

Conclusion

You've successfully integrated Missive with Codex using Composio's MCP server. Now you can interact with Missive 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 Missive 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 Missive operations
Explore cross-app workflows by connecting more toolkits
Build automation scripts that leverage Codex's AI capabilities

TOOLS

Supported Tools

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

Create Analytics Report

Tool to create an analytics report.

Create Missive Contacts

Tool to create one or more contacts in a Missive contact book.

Create Draft

Create a Missive draft for email, SMS, WhatsApp, or Live Chat, for later editing or scheduling.

Create Missive Post

Create a post in an existing Missive conversation, optionally closing it, assigning users, applying labels, or moving it to the inbox.

Create Canned Response

Tool to create one or more canned responses (templates) in Missive.

Create Shared Label

Tool to create one or more shared labels at the organization level.

Create Missive Task

Tool to create a task in Missive.

Create Team

Create a team in an organization with active members and optional observers.

Create Webhook

Tool to create a webhook subscription.

Delete Draft

Tool to delete a draft from a conversation by draft ID.

Delete Post

Delete a post from a conversation by post ID.

Delete Saved Responses

Delete one or more saved responses by ID; responses created by external integrations cannot be deleted through this endpoint.

Delete Webhook

Tool to delete a webhook subscription by webhook ID.

Get Analytics Report

Fetch a completed analytics report by ID.

Get Missive Contact

Tool to fetch a specific contact using the contact ID.

Get Missive Conversation

Fetch conversation metadata by ID, including assignees, users, labels, team and organization.

List Conversation Messages

Tool to list messages belonging to a Missive conversation (newest first).

Get Missive Message

Fetch message details by ID, including headers, HTML body and attachment download URLs when available.

Get Missive Response

Tool to fetch a specific saved response using the response ID.

Get Missive Task

Tool to get a single task by ID with full details including assignees, team, and conversation info.

List Missive Contact Books

Tool to list contact books the authenticated user has access to.

List Missive Contact Groups

Tool to list contact groups or organizations linked to a contact book.

List Missive Contacts

Tool to list contacts from a contact book.

List Conversation Comments

Tool to list comments in a Missive conversation ordered from newest to oldest.

List Conversation Drafts

Tool to list draft messages in a Missive conversation (newest first).

List Conversation Posts

List posts in a Missive conversation, newest first.

List Missive Conversations

List conversations visible to the authenticated user, ordered by newest activity first, using a required mailbox, shared label, or team filter.

List Messages by Message-ID

Tool to fetch messages matching an email Message-ID header.

List Missive Organizations

Tool to list organizations the authenticated user is part of.

List Missive Saved Responses

Tool to list saved responses (canned responses/templates) for the authenticated user.

List Missive Shared Labels

List shared labels accessible to the authenticated user, optionally filtered by organization.

List Missive Tasks

Tool to list tasks accessible to the authenticated user.

List Missive Teams

List teams accessible to the authenticated user in their organizations.

List Missive Users

List users in organizations the authenticated user belongs to.

Merge Missive Conversations

Merge a source Missive conversation into a target, combining their messages, posts, and other entries.

Update Missive Contact

Tool to update one or more contacts in Missive.

Update Saved Response

Update one or more saved response templates, including their title, body, subject, and other attributes; externally integrated responses cannot be updated.

Update Shared Labels

Update the names and colors of one or more Missive shared labels and return the updated labels.

Update Missive Task

Update an existing Missive task by ID.

Update Missive Team

Tool to update one or more teams in Missive.

FRAMEWORKS

How to build Missive MCP Agent with another framework

Claude Code

Use Missive MCP with Claude Code

Claude Cowork

Use Missive MCP with Claude Cowork

OpenAI Agents SDK

Use Missive MCP with OpenAI Agents SDK

Claude Agent SDK

Use Missive MCP with Claude Agent SDK

OpenClaw

Use Missive MCP with OpenClaw

Hermes

Use Missive MCP with Hermes

Atomic Agent

Use Missive MCP with Atomic Agent

Google ADK

Use Missive MCP with Google ADK

LangChain

Use Missive MCP with LangChain

Vercel AI SDK

Use Missive MCP with Vercel AI SDK

Mastra AI

Use Missive MCP with Mastra AI

LlamaIndex

Use Missive MCP with LlamaIndex

CrewAI

Use Missive MCP with CrewAI

Pydantic AI

Use Missive MCP with Pydantic AI

AutoGen

Use Missive MCP with AutoGen

MORE TOOLKITS

Explore Other Toolkits

Toolkit marketplace

Gmail

Oauth2

Gmail is Google's email service with powerful spam protection, search, and G Suite integration. It keeps your inbox organized and makes communication fast and reliable.

Outlook

Oauth2S2s Oauth2

Outlook is Microsoft's email and calendaring platform for unified communications and scheduling. It helps users stay organized with powerful email, contacts, and calendar management.

Slack

Oauth2

Slack is a channel-based messaging platform for teams and organizations. It helps people collaborate in real time, share files, and connect all their tools in one place.

Gong

BasicOauth2

Gong is a platform for video meetings, call recording, and team collaboration. It helps teams capture conversations, analyze calls, and turn insights into action.

FAQ

Frequently asked questions

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

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

Start with Missive.It takes 30 seconds.

Managed auth, hosted MCP servers, and every Missive tool your agent needs.Free to start.

Start building

How to integrate Missive MCP with Codex

Connect Missive without auth hassles

Introduction

Also integrate Missive with

Why use Composio?

How to install Missive MCP in Codex

Run the setup command

(Optional) Authenticate with OAuth

Verify the connection

Codex App

Try it

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

Conclusion

Supported Tools

How to build Missive MCP Agent with another framework

Claude Code

Claude Cowork

OpenAI Agents SDK

Claude Agent SDK

OpenClaw

Hermes

Atomic Agent

Google ADK

LangChain

Vercel AI SDK

Mastra AI

LlamaIndex

CrewAI

Pydantic AI

AutoGen

Explore Other Toolkits

Gmail

Outlook

Slack

Gong

Frequently asked questions

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

Can I use Tool Router MCP with Codex?

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

How safe is my data with Composio Tool Router?

Start with Missive.It takes 30 seconds.