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Mag&Cie
New · MCP Creation

Connect your business tools to AI — cleanly.

MCP (Model Context Protocol) is the open standard that lets Claude, ChatGPT, Cursor and other LLMs act on your systems — not just chat. We build the custom connector you need: secure, production-ready.

Start — Free questionnaireSee pricingDownload proposal (PDF)

Définition. The Model Context Protocol (MCP) is an open standard published by Anthropic in November 2024. It enables an AI assistant (Claude, ChatGPT, Cursor, Continue…) to access tools, data and actions through an intermediary server you control. An MCP exposes three primitives: tools (executable actions), resources (readable data) and prompts (reusable templates).

AI that acts, not just suggests.

An MCP turns your CRM, ERP, Drive or in-house API into tools the AI can read and manipulate in natural language — with fine-grained control over what it can do.

Open standard

No lock-in. Compatible with all modern AI clients (Claude, ChatGPT, Cursor…).

Self-hostable

Your data stays with you. No vendor dependency, on-premise deployment possible.

Fine-grained permissions

You decide what AI can read, write or trigger. Built-in audit logs.

Production-ready

OAuth, monitoring, versioning, error handling. Not a POC: a service that scales.

Two situations, two offers.

MCP CONNECT

SMBs / Mid-market — using AI on your internal tools

Your team uses Claude (or another AI assistant), and you want it to act on your internal tools.

  • Connect your CRM, ERP, SQL database, knowledge base, in-house API
  • Build custom business automations
  • Give your teams a genuinely useful AI assistant
  • Without sending your data to a third party
MCP PUBLISHER

SaaS publishers — expose your product via MCP

Your customers increasingly use conversational AI. Exposing your SaaS via MCP means a new interface and a new distribution channel.

  • Audit and design of your product's MCP
  • Production-ready implementation
  • Distribution via Claude Directory, ChatGPT Apps, etc.
  • Ongoing product support

Note de positionnement. MCP isn't just a technical integration: it's a product decision. We help you arbitrate what to expose, how, and at what granularity — so AI is truly useful without becoming a risk.

5 steps, from first contact to production.

We qualify before quoting. We scope before coding. We deliver before billing the run.

  1. STEP 1

    Preliminary questionnaire

    Free

    15 minutes online to identify the tools to connect, target AI use cases and technical constraints.

  2. STEP 2

    Technical scoping

    Free · 1h video call

    Analysis of your API or target system, selection of tools and resources, choice of authentication, identification of safeguards.

  3. STEP 3

    Detailed quote

    Within 48h

    Fixed scope, listed deliverables, delivery schedule and support/run conditions.

  4. STEP 4

    Development & delivery

    1 to 4 weeks

    Iterative development with weekly demos, real testing with your team, usage and technical documentation, deployment.

  5. STEP 5

    Run & evolutions

    Optional · from €49 excl. VAT/month

    MCP server hosting and monitoring, security and protocol compatibility updates, new tools, support and 30-day warranty included.

Clear tiers, no surprises.

Fixed price for simple MCPs, quote for complex cases. Prices shown excl. VAT and incl. VAT (French VAT 20 %) — EU VAT number: FR47519015713.

MCP Connect — SMBs / Mid-market

For SMBs and mid-market companies who want to connect their internal tools to AI.

MCP Starter
1 simple connector: documented REST API, read-only, up to 5 exposed tools.
€890 excl. VAT
€1,068 incl. VAT
MCP Standard
1 business connector: read + write, 5 to 15 tools, OAuth or API key authentication, error handling.
€1,890 excl. VAT
€2,268 incl. VAT
MCP Custom
Complex connector, multi-system, business logic, advanced security, audit logs.
from €3,500 excl. VAT
from €4,200 incl. VAT
Run & maintenance
Managed hosting, monitoring, security and protocol updates, support.
€49 excl. VAT/month
€58.80 incl. VAT/month

MCP Publisher — SaaS publishers

For SaaS publishers who want to expose their product via MCP.

Audit & MCP specs
Analysis of your API, design of tools and resources, technical specifications document, AI UX recommendations.
€1,490 excl. VAT
€1,788 incl. VAT
MCP Server v1
Production-ready implementation, auth, deployment, developer documentation, integration examples.
from €4,900 excl. VAT
from €5,880 incl. VAT
Publisher support
MCP product advisory, server iterations, partner integration support (Claude Directory, etc.).
Custom quote

Coûts non inclus. hosting (if self-managed by the client), AI service subscriptions, possible third-party fees (auth gateways, external services). Estimates communicated in the detailed quote.

What we can connect, in practice.

Task management

Microsoft To Do, Notion, Trello, Asana

AI creates, moves, completes your tasks from a conversation. Ideal for synthesizing a meeting into a TODO list, or letting AI prioritize your week.

CRM & sales tools

HubSpot, Pipedrive, Salesforce

Read opportunities, update records, generate follow-ups. AI becomes a sales assistant that acts, not just suggests.

Billing & management

Abby, Sellsy, Pennylane, Stripe

Create quotes and invoices from a discussion, track payments, automatically generate customer reminders.

Document spaces

Drive, SharePoint, Notion, Confluence

Search, read, create and update documents. AI accesses your knowledge base without copy or external indexing.

Databases & internal ERP

Custom connectors

For your proprietary systems. Natural-language queries, report generation, smart alerts.

Custom business workflows

Multi-tool orchestration

Signed quote → invoice → Slack notification → Notion task. AI orchestrates multiple tools in one natural workflow.

Public release

An MCP already in production: Microsoft To Do

To demonstrate the method, I open-sourced a complete MCP connector for Microsoft To Do — available on GitHub. OAuth authentication, full CRUD on tasks and lists, ready to plug into Claude Desktop or claude.ai.

  • Microsoft Graph OAuth authentication
  • Read/write tasks and lists
  • Compatible with Claude Desktop & claude.ai
  • Open-source MIT — reusable
MAG-Cie/mcp-microsoft-todo · MIT License

This project illustrates exactly what's delivered in an MCP Standard tier: clean code, install docs, OAuth safeguards. Your scope depends on your needs — we discuss it during the free scoping.

Deliverables

Functional MCP server

Deployed and operational, production-ready.

Source code & documentation

Git repo, README, architecture doc, diagrams.

User usage guide

How to use the MCP from Claude, concrete examples.

Security configuration

Permissions, secrets, audit logs, safeguards.

Common questions.

MCP (Model Context Protocol) is an open standard created by Anthropic in November 2024. It lets an AI assistant (Claude, ChatGPT, Cursor…) access external tools, data and actions — without hardcoding integration on the LLM side. Concretely, an MCP server exposes tools (actions), resources (reads) and prompts (templates) that AI can use on demand, under your control.

Yes — that's actually one of MCP's main benefits. The server can be hosted by you (on-premise or private cloud), it controls what AI can read and write, and exchanges can be logged. No copying, no third-party indexing. Security scope is part of the initial scoping.

An MCP Starter: 1 to 2 weeks. An MCP Standard: 2 to 4 weeks. A complex custom one: quoted on a case-by-case basis. In all cases, weekly demos and iterative delivery — you see the result being built.

All those that implement the MCP protocol: Claude (Desktop, Web, API), ChatGPT (via Apps), Cursor, Continue, and the list is growing rapidly. That's the advantage of the open standard: an MCP built today will work tomorrow with new clients that adopt it.

We adapt. SOAP, GraphQL, direct database, files to parse, scraping… that's precisely what distinguishes a custom MCP from a Starter. The initial scoping (free) is used to assess feasibility and quote the effort.

Yes. The source code is yours, and either you maintain it yourself, or you subscribe to the Run & maintenance offer that includes security updates, protocol compatibility, and adding new tools as needed.

Custom software development can fall under the French CII (Crédit d'Impôt Innovation) or certain regional digital transformation grants. I'm not a tax expert, but I gladly direct you to the right interlocutors.

Ready to plug AI into your tools?

The preliminary questionnaire takes 15 minutes and commits to nothing. Next, a free 1h technical scoping to qualify your need.

Start the questionnaireContact me directly