Nexura DigitalAI · Automation · Marketing
Nexura Digital service

Custom MCP server development to connect AI assistants with your systems

Your team already uses AI assistants but still copies data by hand. With an MCP server, the assistant looks things up or acts in your systems with the permissions you decide.

An MCP server is a connector that makes tools and data from your systems, such as your CRM or ERP, available to assistants that support the Model Context Protocol, like Claude or ChatGPT. We build it for companies that want to use AI on their own data, with least-privilege access and a log of every action. You start with a 7-day trial: a read-only server on one system.

What MCP is, and what we build

The Model Context Protocol is an open protocol that standardizes how AI assistants connect to external tools and data sources. One server works with different compatible clients.

The pieces

The client lives in the AI application, and the server exposes tools (actions such as looking up an order), data resources and prompt templates. It runs locally or remotely over HTTP; for remote servers, the specification defines OAuth-based authorization.

What we develop

  • Custom servers built with the official TypeScript or Python SDKs
  • Tools on top of your CRM, ERP, database or help desk
  • n8n workflows published as MCP tools

Permissions and security

Least privilege

Each tool does one thing. We start read-only, with restricted database users or API keys, and where possible each person signs in with their own account so the assistant acts with their permissions, not an admin's.

Confirmation and logging

Compatible clients usually ask for permission before running a tool, and on top of that we design any action with side effects as a draft or behind explicit confirmation. Every call is logged: who, which tool, with what input and with what result.

Risks we tackle head-on

  • Prompt injection from emails or documents: no defense is perfect, so we limit what each tool can do
  • Secrets kept out of the model's reach
  • Review of third-party MCP servers before installing them

How we build it

From use case to deployment

  • Use cases and a permissions matrix: tool, data, access and confirmation
  • Development and testing with MCP Inspector in a test environment
  • Security testing, including prompt injection
  • Deployment and log review during the first stretch of use

When an MCP server makes sense

It fits

Your team uses Claude, ChatGPT or another compatible assistant every day, your systems have an API or an accessible database, and you want one reusable connector instead of a workaround per tool.

It doesn't fit

  • The process never changes: an n8n workflow or API integration is simpler
  • The vendor already offers an official connector that covers your needs
  • Your assistant or plan doesn't support it; we check this first

Deliverables

What you take away

  • Server code in a repository you own
  • Tool catalog with descriptions and input schemas
  • Permissions matrix and security document
  • Deployment over HTTPS with call logging
  • Connection guide for your team's clients

7-day trial: a read-only server

Read access first

A realistic first step: two or three lookup tools on one system, such as finding customers or checking an order's status, connected to your team's assistant and logging every call. We validate them with real questions before discussing write actions. Scope, dates and terms are agreed in writing up front.

FAQ

Frequently asked questions

Does it work the same with ChatGPT and Claude?

The protocol is the same, but each assistant integrates it in its own way, and availability depends on the app, the version and your plan. Some support local servers, others only remote ones. Before building, we check exactly what your team's setup allows, so we don't develop something you can't connect.

Could the AI delete or change data by mistake?

Only if the server exposes a tool that allows it. That's why we start read-only and keep any later actions narrow: create a draft rather than send it, update one specific field rather than any table. Sensitive operations ask for explicit confirmation, and everything is logged so it can be audited or reversed.

How is an MCP server different from an API integration?

An API integration moves data between systems automatically, the same way every time. An MCP server offers tools to an AI assistant, which decides when to use them based on the conversation. They're often combined: the integration keeps data current and the MCP server lets people query or use it in plain language.

Where does the server run?

A local server runs on each user's computer and suits testing or individual use. For a team, the usual choice is a remote server over HTTPS on your infrastructure or in your company's name, which you pay for directly. The code, credentials and logs stay under your control.

Contact

What data do you paste into your AI assistant by hand today?

Tell us which assistant your team uses and which system you'd like to connect. We'll reply in writing with a proposal to start read-only.

Phone+34 603 636 249
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Emailnexuradigital2026@gmail.com
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How much time could automation give back?

Get a rough estimate of the savings with n8n and AI.

50%
0hours a month
0saved a month
0saved a year

Formula: weekly hours × 4.33 × automatable share × hourly cost. It is an estimate, not a promise; during the 7-day trial we measure it with your real case.