Claude Code is the version of Claude, the AI assistant made by Anthropic, that runs in a terminal (the window where you type commands). When you connect it to Mighty, you can ask about your company's figures and prepare drafts without leaving that window.

If you use Claude in a web browser or the Claude desktop app, follow How to connect Claude to Mighty instead. That guide also explains what Claude can and cannot do in your accounts.

What you need first

• Claude Code installed and signed in.
• An API key from Mighty. An API key is a long password that lets another app into your Mighty company. The first step below shows where to create one.

The command

Copy this command, then put your own key in place of YOUR_KEY. Keep the quotation marks.

claude mcp add --transport http --scope user mighty https://api.mightyaccounting.com/mcp --header "X-Api-Key: YOUR_KEY"

Each part does 1 job:

Keeping your key out of shared projects

The scope decides where Claude Code saves the connection, including your key.

• --scope user saves it in your own settings. Only you can use it. We recommend this one.
• --scope local saves it in your own settings too, but only for the folder you are in when you run the command. This is what you get if you leave the scope out.
• --scope project saves it in a file called .mcp.json inside the project folder. If that folder is shared with other people, they get your key. Do not use this scope for Mighty.

More than 1 company

A key works for 1 company only. To connect a second company, create a key in that company and run the command again with a different name, such as mighty-second-company. Tell Claude Code which company you mean when you ask a question.

Removing the connection

Run this command in your terminal:

claude mcp remove mighty

Then revoke the key in Mighty so it cannot be used again. Go to Company Settings, open the Other tab, select API Keys and select Revoke next to the key.

Common questions

What if mighty shows as failed in the list?

This nearly always means Mighty did not accept the key. Check in Mighty that the key shows Active. If it does, remove the connection and add it again, taking care to paste the whole key with no extra spaces.

What if I lost my key?

Mighty shows a key once and cannot show it again. Revoke that key, create a new one, then remove the connection and add it again with the new key.

How do I see which connections I have?

Run claude mcp list in your terminal. It lists every connection and whether it is working.

Does Claude Code change my accounts?

It has the same limits as Claude everywhere else. It reads your figures and reports. An invoice it creates is saved as a Draft unless you ask for it to be raised, and a bank suggestion is saved as a draft for you to approve in Mighty. A mileage claim is the exception: it counts in your accounts as soon as Claude Code records it.