---
title: "Your MCP tool: extend your Double with custom tools | The Double"
description: "Tools in The Double run on MCP, so your own MCP server can become a tool for your Double, with the same per-action permissions."
url: https://thedouble.ai/platform/mcp-tools
---

1.  [Home](https://thedouble.ai/)
2.  [Tools](https://thedouble.ai/platform/tools)
3.  Your MCP tool

Tool · Your MCP tool

# Bring your own tools to your Double.

Tools in The Double run on MCP, the open standard for connecting AI to apps. So the MCP server you build or already use can become a tool for your Double too.

[Build your Double](https://thedouble.ai/auth/signup)[See all tools](https://thedouble.ai/platform/tools)

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Your channels Your tools

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## How it works _in a conversation._

One example conversation.

**Tools**Connect an app, then set its permissions.

**Your MCP tool**Your own MCP server, as a tool.Custom · MCP_Example_

-   The actions your MCP server exposes
-   Per-action permissions, like every tool
-   Sensitive actions wait for your OK

For every action you choose who can trigger it (nobody, only you, or you and visitors) and whether it asks first. Destructive actions stay locked.

**Maya’s Double**Online

_Customer_

Is the 2 pm slot at the Leeds studio still open?

Used your MCP tool · studio-bookings

_Your Double_

It is. I’ve held it for you for 15 minutes. Want me to confirm it?

## What your own tools _can add._

### Your own systems

Your Double uses tools you built, through MCP.

### Apps without a built-in tool

Your Double connects to any app that offers an MCP server.

### Your own data

Your Double looks up answers in your database.

### One-step workflows

Your Double runs a multi-step process from one request.

### Support tickets

Your Double opens a ticket if your server offers it.

### Kept in check

Your Double asks first when you want it to.

## You stay in control.

Audience

### Who can trigger it

Nobody, only you, or you and visitors.

Ask first

### Ask first or run

Run on its own or wait for your OK.

Actions

### Destructive actions locked

Deleting and overwriting stay off.

Authorised

### Authorised by you

You authorise each MCP server first.

## Get started in _three steps._

1.  STEP 1
    
    ### Authorise your server
    
    Connect an MCP server and authorise it.
    
2.  STEP 2
    
    ### Set who can trigger it
    
    Nobody, only you, or you and visitors.
    
3.  STEP 3
    
    ### Ask first or run
    
    Choose per action.
    
4.  STEP 4
    
    ### Let your Double use it
    
    Its actions join your other tools.
    

[Build your Double](https://thedouble.ai/auth/signup)[Run your Double from ChatGPT](https://thedouble.ai/platform/mcp)

## You might have some questions

**What is an MCP tool?**

MCP (Model Context Protocol) is an open standard that lets AI use apps. An MCP server exposes actions; connected to your Double, those actions become a tool.

**How is this different from the MCP page?**

The MCP page is about running your Double from ChatGPT or Claude. This page is the other direction: your Double using your own MCP tools.

**Do the same permissions apply?**

Yes. You choose what your Double may do with each action, and sensitive actions wait for your OK.

**Do I need to build a server?**

Only if your tool doesn’t have one yet. Many apps already publish an MCP server.

## Extend your Double with your own tools.

Build your Double, then connect your MCP server.

[Build your Double](https://thedouble.ai/auth/signup)