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Connecting an MCP client

Last updated: October 16, 2026

Who can do this: administrators and owners.

What it does

MCP is the protocol an MCP client uses to reach your Lucrii data. The MCP page gives the one address every MCP client points at, under Connection. Below it, Connections lists the MCP clients that are connected.

Connecting is a sign-in followed by a consent screen. The MCP client sends you to Lucrii, where you pick the organisation to connect. The screen then lists the permissions the MCP client needs, and you approve or deny. Access begins only once you approve.

Connections has these columns.

ColumnWhat it shows
UserThe person who connected the MCP client
ClientThe MCP client that connected
ScopesThe permissions they granted, or None
Last usedWhen the MCP client last used the connection

An MCP client can also run a bulk action or start an export, through the same previews and approvals Hermes uses. Imports happen only in Lucrii.

Before you start

Hermes and an MCP client give each date as YYYY-MM-DD. Lucrii reads it as that day in your organisation’s timezone. What Hermes can do and change states the same rule.

Hermes and an MCP client meet the same limits as the forms. What Hermes can do and change says how Lucrii refuses a longer value. A note on a stock adjustment from an MCP client can be up to 1,000 characters.

The MCP page is under Organisation for administrators and owners. Nobody else sees it. Nobody sees it inside a demo organisation, whatever their role.

Revoking an MCP client ends its access at once. It has to connect again from scratch to get access back.

How to use it

  1. Open Settings, then Organisation, then MCP.
  2. Copy the address with the button beside it. The button shows Copied once the address is on your clipboard.
  3. In your MCP client, add a custom MCP server and paste the address.
  4. Sign in when the MCP client sends you to Lucrii, choose the organisation and approve the permissions.
  5. To cut an MCP client off, find its row under Connections and select Revoke. Select Revoke again to confirm.

Connections lists the whole organisation, including rows connected by other people, with their name in the User column. Last used reads Never for a connection that has been approved but not used yet. A connection belongs to the person who made it. When two people use the same MCP client, they get a row each.

Troubleshooting

The page says Could not copy to clipboard. Your browser blocked the copy. Select the address and copy it yourself.

  • Browsing the App Store: Browse the App Store for apps to install, using the search box, the sort and the View installed only switch.
  • Managing an installed app: Set up an installed app on its installation page, update it, reconnect it when it asks, or uninstall it.
  • Bulk actions with Hermes: Ask Hermes for a bulk action such as recording payment on every unpaid invoice, and approve its preview before Hermes changes anything.

Changes