You open Claude and type: «who owes me money?». Within seconds you have the list of overdue invoices from your NAiOS ERP, with amounts and days overdue. You ask it: «send Acme a friendly reminder about the October invoice». Claude drafts the email, shows it to you, you confirm it and it goes out from your NAiOS Mail inbox. You haven't opened NAiOS, you haven't copied anything and you haven't pasted anything. That's NAiOS MCPModel Context Protocol (MCP)Standard protocol for models to connect with external tools Gateway: your NAiOS data, available in the AI you already use.
In 30 seconds
- Connect Claude to your NAiOS and ask it about your emails, your calendar, your customers, your invoices or your contracts.
- It works via MCP, the open standard that AIs use to connect to other programmes. That's why it also works in Claude Code, Cursor, VS Code and other compatible tools.
- Ten modules to query: Mail, ERP, CRM, Calendar, Accounting, Treasury, Tasks, Support, Office and Legal.
- And one action, if you enable it: send emails from your NAiOS Mail, with confirmation before each send.
- You log in with your NAiOS account, the AI sees the same as you and nothing more, you choose which modules you share and you can disconnect it whenever you want.
- Available from today on NAiOS cloud for the Basic and MAX plans.
What an MCP server is (without the jargon)
Conversational AIs are very good at reasoning, but they know nothing about your company: they can't see your email, your invoices or your calendar. For years the solution was copy and paste. MCP (Model Context Protocol) changes that: it's a standard socket, like USB-C, so that any AI can connect to any programme that speaks it.
There are two sides to that socket. The MCP client is the AI: Claude, Cursor, VS Code. The MCP server is the programme that offers its capabilities, and tells the AI "this is what I can do": list emails, read an invoice, check the calendar. When you ask something, the AI decides which tool it needs, requests it, receives the result and answers you with it. You just talk.
NAiOS MCP Gateway is NAiOS's MCP server: the door through which your AI enters your modules, with your account and your permissions. If you want to go into detail, we explain it in the NAiOS Wiki: Model Context Protocol.
NAiOS MCP and NAiOS MCP Gateway: the two directions
If you follow NAiOS, you already know NAiOS MCP. They are complementary and go in opposite directions:
- NAiOS MCP brings tools from outside into NAiOS: you connect an external MCP server and NAiOS chat and agents use it.
- NAiOS MCP Gateway takes NAiOS outwards: NAiOS is the server and your usual AI uses it.
With both, NAiOS speaks MCP in both directions: it consumes the ecosystem's tools and offers itself to it.
What this first version brings
We're starting with what's used most in a company's day-to-day work, in read mode:
- NAiOS Mail: list, search and read your emails, across all your accounts.
- ERP: business summary, invoices, outstanding receipts and payments, sales, expenses, customers, suppliers and stock.
- CRM: search customers, the summary of each record and your sales diary.
- Calendar: your events, your free slots and your bookings.
- Accounting: balances, entries, ledger and VAT return.
- Treasury: cash position, unreconciled movements and customers who pay late.
- Tasks: your cards and the status of your boards.
- Support: your tickets with NAiOS and where they stand.
- Office: read your documents and spreadsheets.
- Legal: your contracts, their summary, your templates and the comparison of a draft with the original.
And a first action: sending emails. New ones, replies, forwards and drafts, from your NAiOS Mail. It doesn't come activated: you choose it when connecting with a separate tick box, «Send emails on your behalf». And even then, Claude shows you each email and asks for confirmation before sending it.
Example use cases
What's interesting isn't each tool separately, but that the AI combines them on its own from a single sentence. Some real examples of what you can ask today:
Management: getting paid without chasing
«Which invoices are overdue and who owes me the most?» → ERP list sorted by amount. «Write a friendly reminder to the top three with the invoice number and amount.» → three emails prepared, which you review and confirm one by one.
Sales: arriving prepared for every meeting
«Prepare me for the 10 o'clock meeting.» → Claude looks at your Calendar, finds the client in the CRM, reviews the latest emails you've exchanged and gives you a summary of what's pending and a proposed agenda.
Administration: the week's snapshot
«How's our cash flow and what payments are due this week?» → Treasury balances and ERP due dates in a single answer, with an alert if something doesn't add up.
Monday morning: what I've got pending
«What have I got pending this week and what important emails am I still not answering?» → your Tasks cards, your diary and unanswered emails in a single review. «Reply to Laura that she'll have the report on Thursday.» → reply in the same thread, subject to confirmation.
Contracts: the detail to hand
«Summarise the contract with García and tell me what changes in the new draft.» → contract summary and comparison with the draft from Legal, without searching folders.
Technical profiles: NAiOS inside the editor
In Claude Code, Cursor or VS Code, the same address turns NAiOS into another source for your agent: look up a client, an ERP product or an Office document whilst you work, without switching windows.
The strong case: NAiOS alongside the rest of your tools
Claude accepts several connectors at once. If you also have your Drive, your Slack or your code repository connected, in a single conversation you can cross-reference NAiOS data with everything else: «compare October sales from the ERP with the forecast we have in the Drive sheet and notify the team on Slack». It's the idea of the great integration: AI as the layer that unites the company's tools.
How to connect, in three steps
- In NAiOS, open AI Connections from the module launcher (it appears as NAiOS Gateway) and click Copy address.
- In claude.ai: Settings → Connectors → Add custom connector. Paste the address and click Add.
- Click Connect: NAiOS opens. You log in with your account, choose which modules you share (and, if you wish, sending emails) and click Allow. You return to Claude already connected.
It works in Claude web, in the desktop application and on mobile. If you later want to share other modules, you connect again and choose them: the previous connection is replaced automatically.
Security and control: your data remains yours
Opening your data to an external AI requires clear rules. These are NAiOS MCP Gateway's:
- The same as you, and nothing more. The AI enters with your account and your permissions. If you don't have a module, it doesn't see it; if you change plan or role, it applies on the next query.
- You choose the modules. You can share only the calendar and CRM, for example.
- Querying is not acting. Everything is read-only except sending emails, which is a separate permission, unticked by default, with confirmation on each send and with limits: up to 10 recipients per email and 20 sends per hour.
- Your company decides. If you're a member of a company, its administrator decides whether its members can connect external AIs, with which modules and whether it allows sending emails. By default, no: the company's data doesn't leave without its permission.
- Disconnecting is immediate. In «Your connections» you see which AI is connected, with which modules, whether it can send emails and when you last used it. «Disconnect» cuts off its access instantly.
- Everything is logged. NAiOS records every query and every action.
And a matter of transparency: what the AI queries is sent to its provider so it can respond to you (in Claude's case, to Anthropic), as happens with any connector. That's why you choose what to share.
What it doesn't do yet
We'd rather tell you ourselves. This is the first version:
- The only action is sending emails, in text and without attachments. Creating invoices, moving opportunities or scheduling meetings will come in future versions.
- We're testing ChatGPT and other assistants; we'll announce them when they're verified.
- For now it's in NAiOS cloud; the rest of the NAiOS platforms will receive it in due course.
- NAiOS now has its single connector address, https://mcp.naios.net/mcp: it's the one you copy in AI Connections. It isn't in Claude's connector directory yet, so for now you add it as a custom connector; the next step is to be listed in the directory so you can connect with one click.
Where it is
NAiOS MCP Gateway is available from today in NAiOS cloud for Basic and MAX plans. If you already use NAiOS, open AI Connections and in two minutes you'll be asking Claude about your emails. If not, create your account and try it with the question you repeat most every Monday.
