eustella added support for MCP Servers! Connect any app via our new feature

Summary

Every day, we work on eustella and improve our services for Europeans who want a more useful, capable and trustworthy AI agent in their everyday lives. That work happens across the entire product: from the models and infrastructure behind eustella to the tools eustella can work with. Our goal is simple: make eustella more helpful, more accessible and more dependable with every improvement we make.

Today, we are proud to share an important new capability. eustella can now work directly inside other third-party tools you already use.

eustella can now work with MCP

Up to now, working across tools meant copying and pasting between them yourself: reading one, drafting in another, updating a third. With connectors, links to outside services, eustella can work across them in a single conversation.

Instead of five apps, you ask one thing: Check the Q4 pricing document in Notion, file a Linear issue for the missing tables, and draft a short note to the client team with what changed. eustella reads, drafts and updates across the tools you have connected — and asks you before it changes anything.

Connectors are built on the Model Context Protocol (MCP), the open standard for connecting AI assistants to other software. eustella ships with a curated catalog of connectors and also lets you add any MCP server yourself.

A curated catalog of connectors

eustella launches with more than 25 connectors you can set up in a few steps from Settings → Connectors, on the web and in the mobile apps:

Productivity and project management: Notion, Linear, Todoist, Asana, monday.com, Airtable, Atlassian (Jira & Confluence), Calendly, Zapier
Finance and payments: Stripe, PayPal, Mollie, Qonto, Bitpanda
Design and websites: Canva, Wix
Marketing and language: Brevo, DeepL
Developer tools and analytics: GitHub, GitLab, Supabase, Vercel, Sentry, PostHog, Grafana Cloud, Hugging Face
Travel: Kiwi.com flight search

This is our first curated list. We will update it the days, weeks & months to come!

A filter for European providers

One click on the EU filter shows European connectors from companies like the following: DeepL, Mollie, Brevo, Qonto, Kiwi.com, n8n and Nextcloud.

Your own servers, and any MCP server

Many European companies run their own tools. eustella connects to them: point it at your own Nextcloud instance for files, calendar, tasks and contacts, or at your n8n instance to run your approved workflows and automations from a chat.

With Add custom connector, you can also paste the address of any remote MCP server you host or know about - like your MCP Server for your WordPress site. eustella supports servers with no sign-in, servers that use an API key, and servers that use account sign-in through OAuth.

You can also connect from the chat itself: ask eustella to connect a service and it suggests the right connector. API keys and passwords never pass through the conversation — eustella opens a secure form or a sign-in window from the provider, and the chat never sees your credentials.

You stay in control

An agent that can change things in your tools needs clear limits. We have built those limits into every connector:

Read first, ask before changing. eustella labels every tool as Reads data or Can make changes. By default, catalog connectors run read-only tools automatically. Anything that can create, change or delete data asks you first, with Approve and Deny buttons. You can change those settings for each connected app.
Stricter defaults for custom servers. For a server you add yourself, eustella asks before every single call. It also ignores the server's own claim that a tool is read-only.
Fine-grained settings. For each connector you choose the auto-run mode (Off, Read-only or All tools). You can also turn individual tools on or off, or reclassify them.
Safe in group chats. In a group chat, each member only uses their own connectors, every action asks first, and only the connection's owner can approve it.
Encrypted credentials. eustella encrypts API keys and sign-in tokens at rest, and you can disconnect a connector at any time.
Defences against prompt injection. eustella treats everything a connector returns as untrusted content. It limits how much data a connector can send back, and it fetches vendor icons itself.

We believe that a useful agent and a clear line of accountability belong together. That is why these limits are built in by default, not optional add-ons.

This is only the beginning

Connectors are live starting today, carrying a Beta label while we gather feedback. Anyone can browse the full catalog on any plan.

We will continue to improve eustella every day, making it more useful, accessible and capable for people across Europe. To try it, open eustella, go to Settings → Connectors and pick a service from the catalog — or simply ask eustella in a chat: "Connect my Notion." eustella is available on the web, on Android via Google Play and on iPhone via the App Store.

Missing a connector you need? Write us a mail at office@eustella.com. The catalog grows with what our users actually work with.

Thank you for being part of eustella. We are excited to see what you do with an agent that connects with your other tools!