How to integrate Agent mail MCP with Grok Build

Connect Grok Build to Agent mail MCP. Show me unread emails from today, send a status update to your team, and more from your terminal, with authentication handled for you.

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Agent mail provides AI agents with dedicated email inboxes for sending, receiving, and managing emails. It empowers agents to communicate autonomously with people, services, and other agents—no human intervention needed.

5 Tools1 Triggers

How to integrate Agent mail MCP with Grok Build

Grok Build is xAI's terminal coding agent. It runs on Grok 4.5, plans its work before it acts, and can run multiple sub-agents in parallel. It also reads Claude Code's MCP configuration, so any server you already have in a .mcp.json is picked up with no changes.

In this guide, I will show you how to connect your Agent mail account to Grok Build through Composio, so it can show me unread emails from today, send a status update to your team, find emails with invoice attachments, and more without leaving the terminal. Composio holds the OAuth tokens for you, and Grok Build only calls the tools you approve.

Also integrate Agent mail with

ChatGPT WorkAntigravityOpenAI Agents SDKClaude Agent SDKClaude CodeClaude CoworkCodexCursorVS CodeOpenCodeOpenClawHermesGoogle ADKLangChainVercel AI SDKMastra AILlamaIndexCrewAIPydantic AIAutoGen

Why use Composio over a standalone MCP server?

  • Read and write access. Composio's Agent mail integration lets Grok Build take real actions like creating drafts, sending updates, and labeling records, not just reading data.
  • 1,000+ SaaS toolkits out of the box. One endpoint gives you a full catalog of pre-built connectors, from Gmail and Slack to Notion, Linear, and Salesforce.
  • One MCP server for every app. Wire up a single Composio server instead of maintaining a separate MCP entry for each app.
  • Smart, context-aware tool loading. Grok Build caps how many tools it holds in a single request. Composio loads only the tools a task needs, so you do not spend that budget on tools you are not using.
  • Cross-app automation. Chain actions across apps in one run. Pull a thread, summarize it in Notion, and post the highlights to Slack from a single prompt.

Prerequisites

  • Grok Build installed and signed in. Install with curl -fsSL https://x.ai/cli/install.sh | bash on macOS or Linux, or irm https://x.ai/cli/install.ps1 | iex on Windows PowerShell. On first launch Grok opens a browser to authenticate; for headless or CI use, set an XAI_API_KEY environment variable instead (create the key at console.x.ai).
  • Access to the Agent mail account you want to connect.
  • The Composio MCP endpoint. Composio's server is remote and hosted, so there is nothing to run locally and no tunnel to set up.

Step-by-step: Connect Agent mail to Grok Build

1. Install and verify Grok Build

Install the CLI, then restart your shell so the grok binary lands on your PATH:

bash
curl -fsSL https://x.ai/cli/install.sh | bash
which grok

On Windows, install with PowerShell instead: irm https://x.ai/cli/install.ps1 | iex. If which grok returns a path, you are set. Grok Build runs on Grok 4.5 by default; you can switch models inside the session with /model <name>.

2. Add the Composio server

Add Composio as a remote HTTP MCP server with the grok mcp add command:

bash
grok mcp add --transport http composio https://connect.composio.dev/mcp

You can also add and manage servers from inside a session. Run /mcps to open the extensions modal on the MCP tab, then add a new server and paste the Composio URL. Added this way, Grok auto-detects the name from the URL and lists the server as connect:

bash
https://connect.composio.dev/mcp
Grok Build /mcps extensions modal listing MCP servers Grok Build adding the Composio MCP server with its URL

Grok also reads Claude Code-style config, so an entry in ~/.grok/config.toml or a project .mcp.json works the same way.

3. Authenticate

Composio uses OAuth. In the /mcps modal, select the Composio server and press i to authenticate (Grok also triggers this browser flow automatically the first time it uses a Composio tool). Click Allow to authorize access. Grok stores the tokens under ~/.grok/mcp_credentials.json, and /mcps shows Composio as connected.

Grok Build prompting to authenticate the Composio MCP server Composio authorization screen with the Allow button for Grok Build

4. Start building

Ask Grok to work with your Agent mail account through Composio. On the first Agent mail action, Composio prompts you to connect the account through OAuth. Approve the scopes once, and Composio handles token refresh from there.

What you can do after connecting Agent mail

  • Show me unread emails from today
  • Send a status update to your team
  • Find emails with invoice attachments
  • Forward the latest client message to support

Security + privacy notes (important)

  • Use least-privilege access. Grant only the Agent mail scopes you actually need.
  • Review OAuth scopes before approving. Check that the requested scopes match what you expect Composio and Grok Build to do.
  • Keep write actions human-reviewed. Grok Build proposes a plan before it acts. Leave that approval step on for actions like sending messages or editing records.
  • Keep secrets out of version control. Your XAI_API_KEY and any tokens should never be committed. Use environment variables or a secrets manager.
TOOLS & TRIGGERS

Supported Tools and Triggers

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

Create Inbox

Create a new AgentMail inbox via API.

Get Message

Retrieve the complete details of a specific email message from an AgentMail inbox.

List Inboxes

List all inboxes available to the authenticated AgentMail account.

List Messages

List messages from an AgentMail inbox.

Send Email

Send an email using AgentMail API

FRAMEWORKS

How to build Agent mail MCP Agent with another framework

ChatGPT Work logo

ChatGPT Work

Use Agent mail MCP with ChatGPT Work

Antigravity logo

Antigravity

Use Agent mail MCP with Antigravity

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Agent mail MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Agent mail MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Agent mail MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Agent mail MCP with Claude Cowork

Codex logo

Codex

Use Agent mail MCP with Codex

Cursor logo

Cursor

Use Agent mail MCP with Cursor

VS Code logo

VS Code

Use Agent mail MCP with VS Code

OpenCode logo

OpenCode

Use Agent mail MCP with OpenCode

OpenClaw logo

OpenClaw

Use Agent mail MCP with OpenClaw

Hermes logo

Hermes

Use Agent mail MCP with Hermes

Google ADK logo

Google ADK

Use Agent mail MCP with Google ADK

LangChain logo

LangChain

Use Agent mail MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Agent mail MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Agent mail MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Agent mail MCP with LlamaIndex

CrewAI logo

CrewAI

Use Agent mail MCP with CrewAI

Pydantic AI logo

Pydantic AI

Use Agent mail MCP with Pydantic AI

AutoGen logo

AutoGen

Use Agent mail MCP with AutoGen

FAQ

Frequently asked questions

A standalone Agent mail MCP server gives Grok Build a fixed set of Agent mail tools tied to that one server. The Composio Tool Router lets Grok Build load tools from Agent mail and many other apps on demand, based on the task, all through a single endpoint.

Yes. Grok Build ships with native MCP support. Add a server with the grok mcp add command, from the in-session /mcps modal, or by editing ~/.grok/config.toml. It also reads Claude Code-style .mcp.json files, so Grok Build discovers the tools automatically.

Yes. Grok Build has zero-migration compatibility with Claude Code's configuration, so the same Composio server entry works in both without edits.

Tokens, keys, and configuration are encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant, so your Agent mail data and credentials are handled to that standard.

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