Mammoth MCP server

Mammoth MCP server: let Claude and ChatGPT work on your real data.

Your AI assistant can’t see your company’s data on its own. Add Mammoth’s MCP server and it can answer questions, clean data and build dashboards. Mammoth calculates the answer, so the numbers are exact. On every plan.

Try free See it work

100+Your dataApps, databases, files
MammothCleans and calculates
Your AI assistantClaude, ChatGPT, VS Code

Server addresshttps://mcp.mammoth.io/mcp

Why Mammoth

Your assistant is only as good as the data it can reach

Without Mammoth

It can't see your data, so you copy and paste exports into the chat.
The AI model adds up the rows itself.
It can describe a dashboard, but you still build it.

With Mammoth

It reads the data you've connected to Mammoth, from any of 100+ sources.
Mammoth calculates totals, counts and averages, so the numbers are exact.
It cleans the data, builds the dashboard and shares the link.

See it work

From a question to a shared dashboard, in one chat

Three requests in one conversation. Each step shows the Mammoth tool your assistant used, and what kind of action it is.

Claude

ChatGPT

VS CodeMammoth connected

What was our revenue each month this quarter?

get_dataTotalled Stripe charges by monthRead-only

Month	Revenue ($)
Jul	184,210
Aug	192,880
Sep	201,445

Shown on sample data. Your assistant does this on your own data.

It can also

Send data to other tools and set up automations
Bring in files with a one-time upload link
Explore your projects, datasets and views

Your data

It works with the data you already have

Pick a source to see questions you can ask about it. Mammoth connects to 100+ sources in all.

Using another source? See all 100+ sources.

Set up

Add Mammoth to your AI assistant

Pick your assistant. You need a Mammoth account. There's nothing to install.

1
In Claude on the web or Claude Desktop, add a custom connector with this address.
```
https://mcp.mammoth.io/mcp
```
2
Sign in to Mammoth when Claude asks. Pick the workspace and the project you want Claude to use.
3
Optional: in the connector's settings, set read-only tools and interactive tools to Always allow. Claude then asks you less often, and still asks before anything destructive.

On a Claude Team or Enterprise plan, an owner adds the connector for the organisation.

Add the server from your terminal.

claude mcp add --transport http mammoth https://mcp.mammoth.io/mcp

2
In a Claude Code session, run /mcp, choose mammoth and sign in.
3
Optional: add --scope user to the first command to use Mammoth in every project.

1
In ChatGPT, open Plugins, select the plus button and choose Add custom MCP server.
2
Enter a name and this address.
```
https://mcp.mammoth.io/mcp
```
3
Set authentication to OAuth. If ChatGPT offers Client ID Metadata Documents (CIMD), choose it.
4
Accept the warning, choose Create as a plugin, then install the plugin and sign in to Mammoth.

The plugin has to be installed, not just created, before ChatGPT can use it.

Add this to .vscode/mcp.json in your project. It holds no password or key.

{
  "servers": {
    "mammoth": {
      "type": "http",
      "url": "https://mcp.mammoth.io/mcp"
    }
  }
}

2
Sign in to Mammoth when VS Code asks.

Using Cursor? It can’t sign in to Mammoth’s server yet, so use the Mammoth CLI there. Full details are in our MCP docs.

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Control

You decide what your assistant can do

Every tool says what kind of action it is, so you decide what your assistant can do without asking.

Read-only

Look, never change.

Read rows
List dashboards
Preview a step

Reversible

Changes you can undo.

Add a step
Create a dashboard
Import a sheet

Destructive or outward

Your assistant can ask you first.

Delete a view
Publish a dashboard
Run an export

Sign in, no keys in the chatYou sign in to Mammoth in your browser. No password or API key goes through the model.
Your permissions, one workspaceYour assistant works as you, with your access. Each sign-in covers one workspace and the projects you pick.
Files skip the modelUploads use a one-time link that expires after 30 minutes.
Disconnect any timeRevoke access under Settings, then Connected apps. It stops straight away.

More on how Mammoth handles your data on the security page.

Common questions about the Mammoth MCP server

What is the Mammoth MCP server?

It connects your AI assistant to your Mammoth workspace. Your assistant can answer questions about your data, clean it, build dashboards and set up exports, and Mammoth does the calculations.

What is MCP?

MCP (Model Context Protocol) is an open standard that lets AI assistants use outside tools and data. Mammoth's MCP server is how Claude, ChatGPT and VS Code reach your data in Mammoth.

What is the server address?

https://mcp.mammoth.io/mcp. There's nothing to install.

Which AI assistants work with it?

Claude on the web, Claude Desktop and Claude Code, ChatGPT, and VS Code.

Does it work in Cursor?

Not yet. Cursor can't sign in to Mammoth's server, so use the Mammoth CLI there instead.

What does it cost?

The MCP server is on every Mammoth plan, including Free. The Free plan connects to files, Google Sheets and standard databases like Postgres. Other sources need a paid plan.

Are the numbers right?

Yes. Mammoth calculates totals, counts and averages itself and gives your assistant the result. The AI model doesn't add up the rows.

Do I paste a password or API key into the chat?

No. You sign in to Mammoth in your browser, and your sources are connected inside Mammoth. No password passes through the model.

Can my assistant change or delete things?

Only with the tools that allow it. Every tool is labelled read-only, a change you can undo, or one that deletes or sends data out, and you can set your assistant to ask you before it uses anything that isn't read-only. Deleted dashboards and automations go to the trash, where you can restore them.

Can it see all my workspaces?

No. Each sign-in covers one workspace. To use another workspace, connect again and pick it.

How do I disconnect it?

In Mammoth, go to Settings, then Connected apps, and choose Revoke next to your assistant. Access stops straight away.

Is there a server for Mammoth's docs?

Yes, at https://docs.mammoth.io/mcp. It needs no sign-in and can't see your workspace. It answers questions about how Mammoth works.

Is it in the official MCP Registry?

Yes, as io.mammoth/mcp.