Custom MCP servers · fixed scope
We build custom MCP servers that let Claude, ChatGPT, Cursor or your own agent look things up in the systems your team already uses — and change them only after a person confirms. Everyone signs in with their own account, every tool has a scope, every call lands in an audit log.
§02Definition
An MCP server is a small service that gives an AI assistant a fixed set of tools for one of your systems: “find a deal”, “show overdue invoices”, “create a task”. It speaks the Model Context Protocol, an open standard that Claude, ChatGPT, Cursor and many agent frameworks support, so one server works in all of them. The AI never sees a password: it can only call the tools you allow, with the rights of the person using it.
A custom MCP server fits your data model and your rules. Off-the-shelf connectors cover popular SaaS apps, but rarely your custom fields, approval steps or in-house API.
Works with
Why now
ChatGPT opens app submissions. Its Apps SDK is built on MCP.
OpenAIUpwork ships an MCP server for hiring from Claude, ChatGPT and Cursor.
UpworkClaude Marketplace launches with 2,000+ connectors and plugins; submissions open on 25 Sep.
gHacks, Unite.AI§03Use cases
Your team stays in the AI chat it already likes. The server brings in live data and turns “please do this” into a checked action.
Sales · CRM
“Which deals in negotiation haven’t moved for 10 days?”
crm.list_deals {stage:"negotiation", idle_days:10}
Seven deals, largest first, with owners and last activity.
Finance · accounting
“Who has owed us money for more than 30 days?”
acc.overdue {days:30}
Totals by customer, plus a drafted reminder for each.
Support · knowledge base
“Can annual plans get a partial refund?”
kb.search {q:"refund annual plan"}
A quote from the policy, with a link to the exact section.
Operations · tasks
“Create a task for Anna to call the supplier tomorrow.”
tasks.create {assignee:"Anna", due:"tomorrow"}
The AI shows the task and waits for “Confirm” before creating it.
§04Systems
Most projects start with one system and 3–5 tools. If the answers live in documents rather than tables, a knowledge-base assistant (RAG) can sit behind the same server.
| System | Typical tools | How we connect |
|---|---|---|
| CRMHubSpot, Salesforce, Pipedrive | contacts, deals by stage, notes, tasks | official REST API, OAuth app |
| AccountingQuickBooks, Xero | invoices, payments, overdue balances | official API, read scopes first |
| DatabasesPostgres, MySQL, BigQuery | saved reports, safe queries with row limits | read-only replica or a restricted role |
| Docs & knowledgeGoogle Drive, Notion, Confluence | search with source links, page drafts | API plus a search index |
| ERP & back officeOdoo, NetSuite, in-house tools | stock, orders, statuses | REST or GraphQL, or an adapter we write |
| SpreadsheetsGoogle Sheets, Excel online | read ranges, append rows | Sheets API, Microsoft Graph |
§05Interactive
Pick a system and an access level to see the tools we’d build, how the AI uses them and the price. Then send the config to the form.
01System
02Access level
# mcp.config · CRM · Read-only
server: crm-mcp
transport: streamable-http
auth: oauth2.1 · per-user
tools:
- name: crm.search_contacts
description: "Find a contact or company by name, email or phone"
scope: contacts:read
- name: crm.list_deals
description: "Deals by stage, owner and days without activity"
scope: deals:read
- name: crm.get_deal
description: "Deal card with history, amount and next step"
scope: deals:read
# mcp.config · CRM · Read + drafts
server: crm-mcp
transport: streamable-http
auth: oauth2.1 · per-user
tools:
- name: crm.search_contacts
description: "Find a contact or company by name, email or phone"
scope: contacts:read
- name: crm.list_deals
description: "Deals by stage, owner and days without activity"
scope: deals:read
- name: crm.get_deal
description: "Deal card with history, amount and next step"
scope: deals:read
- name: crm.draft_notedraft only
description: "Draft a note or follow-up email; a person sends it"
scope: notes:draft
# mcp.config · CRM · Read + write
server: crm-mcp
transport: streamable-http
auth: oauth2.1 · per-user
tools:
- name: crm.search_contacts
description: "Find a contact or company by name, email or phone"
scope: contacts:read
- name: crm.list_deals
description: "Deals by stage, owner and days without activity"
scope: deals:read
- name: crm.get_deal
description: "Deal card with history, amount and next step"
scope: deals:read
- name: crm.update_stageneeds confirmation
description: "Move a deal to another pipeline stage"
scope: deals:write · confirm: true
- name: crm.create_taskneeds confirmation
description: "Create a task for a team member"
scope: tasks:write · confirm: true
# mcp.config · Database · Read-only
server: db-mcp
transport: streamable-http
auth: oauth2.1 · per-user
tools:
- name: db.list_tables
description: "Tables and columns this role may see"
scope: schema:read
- name: db.run_report
description: "Run a saved report with parameters: sales, stock, MRR"
scope: reports:read
- name: db.query
description: "Read-only SELECT on a replica, 500 rows max"
scope: data:read
# mcp.config · Database · Read + drafts
server: db-mcp
transport: streamable-http
auth: oauth2.1 · per-user
tools:
- name: db.list_tables
description: "Tables and columns this role may see"
scope: schema:read
- name: db.run_report
description: "Run a saved report with parameters: sales, stock, MRR"
scope: reports:read
- name: db.query
description: "Read-only SELECT on a replica, 500 rows max"
scope: data:read
- name: db.draft_changedraft only
description: "Prepare an INSERT or UPDATE as a change request"
scope: changes:draft
# mcp.config · Database · Read + write
server: db-mcp
transport: streamable-http
auth: oauth2.1 · per-user
tools:
- name: db.list_tables
description: "Tables and columns this role may see"
scope: schema:read
- name: db.run_report
description: "Run a saved report with parameters: sales, stock, MRR"
scope: reports:read
- name: db.query
description: "Read-only SELECT on a replica, 500 rows max"
scope: data:read
- name: db.insert_rowneeds confirmation
description: "Add a row to an allowed table: orders, tickets"
scope: data:write · confirm: true
- name: db.update_rowneeds confirmation
description: "Update allowed fields of one row by id"
scope: data:write · confirm: true
# mcp.config · Accounting · Read-only
server: accounting-mcp
transport: streamable-http
auth: oauth2.1 · per-user
tools:
- name: acc.find_invoices
description: "Invoices by customer, status and date"
scope: invoices:read
- name: acc.overdue
description: "Overdue balances by customer, with ageing"
scope: reports:read
- name: acc.get_customer
description: "Customer card: terms, contacts, open items"
scope: customers:read
# mcp.config · Accounting · Read + drafts
server: accounting-mcp
transport: streamable-http
auth: oauth2.1 · per-user
tools:
- name: acc.find_invoices
description: "Invoices by customer, status and date"
scope: invoices:read
- name: acc.overdue
description: "Overdue balances by customer, with ageing"
scope: reports:read
- name: acc.get_customer
description: "Customer card: terms, contacts, open items"
scope: customers:read
- name: acc.draft_invoicedraft only
description: "Create an invoice draft; the accountant sends it"
scope: invoices:draft
# mcp.config · Accounting · Read + write
server: accounting-mcp
transport: streamable-http
auth: oauth2.1 · per-user
tools:
- name: acc.find_invoices
description: "Invoices by customer, status and date"
scope: invoices:read
- name: acc.overdue
description: "Overdue balances by customer, with ageing"
scope: reports:read
- name: acc.get_customer
description: "Customer card: terms, contacts, open items"
scope: customers:read
- name: acc.create_invoiceneeds confirmation
description: "Create and send an invoice"
scope: invoices:write · confirm: true
- name: acc.record_paymentneeds confirmation
description: "Record a payment against an invoice"
scope: payments:write · confirm: true
# mcp.config · Docs & knowledge base · Read-only
server: docs-mcp
transport: streamable-http
auth: oauth2.1 · per-user
tools:
- name: kb.search
description: "Search policies and docs, return passages with links"
scope: docs:read
- name: kb.get_page
description: "Full text of one page or file"
scope: docs:read
- name: kb.recent_changes
description: "What changed in the docs this week"
scope: docs:read
# mcp.config · Docs & knowledge base · Read + drafts
server: docs-mcp
transport: streamable-http
auth: oauth2.1 · per-user
tools:
- name: kb.search
description: "Search policies and docs, return passages with links"
scope: docs:read
- name: kb.get_page
description: "Full text of one page or file"
scope: docs:read
- name: kb.recent_changes
description: "What changed in the docs this week"
scope: docs:read
- name: kb.draft_pagedraft only
description: "Draft a new article or an edit as a suggestion"
scope: docs:draft
# mcp.config · Docs & knowledge base · Read + write
server: docs-mcp
transport: streamable-http
auth: oauth2.1 · per-user
tools:
- name: kb.search
description: "Search policies and docs, return passages with links"
scope: docs:read
- name: kb.get_page
description: "Full text of one page or file"
scope: docs:read
- name: kb.recent_changes
description: "What changed in the docs this week"
scope: docs:read
- name: kb.update_pageneeds confirmation
description: "Publish an edit to an existing page"
scope: docs:write · confirm: true
- name: kb.publish_pageneeds confirmation
description: "Publish a new page to a chosen space"
scope: docs:write · confirm: true
Which deals in negotiation have had no activity for 10 days?
crm.list_deals {stage:"negotiation", idle_days:10}200Four deals, $31,400 in total. The largest is Northwind renewal ($12,000), owner Mark, last call on 18 Sep.
Write Northwind a follow-up about the renewal.
crm.draft_note {deal:"Northwind renewal"}draft onlyThe draft is saved to the deal in your CRM. Mark can review it and send it from there.
Northwind signed. Move the deal to Won.
crm.update_stage {deal:"Northwind renewal", stage:"won"}needs confirmationMove “Northwind renewal” to Won?
✓ confirmed by youDone: the deal is in Won, and the change is in the audit log under your name.
What was revenue by plan last month?
db.run_report {name:"revenue_by_plan", month:"2026-09"}200Pro $18,240, Team $9,860, Starter $2,310 — 412 paying accounts in total.
Customer 1187 moved to the Team plan. Update the record.
db.draft_change {table:"accounts", id:1187, plan:"team"}draft onlyChange request #57 is ready. An admin approves it in the review queue.
Add an order for Acme: 20 units of A-1042.
db.insert_row {table:"orders", customer:"Acme", sku:"A-1042", qty:20}needs confirmationInsert 1 row into “orders”?
✓ confirmed by youOrder #9312 is created and logged with your user and the exact values.
Who has owed us money for more than 30 days?
acc.overdue {days:30}200Three customers, $7,950 overdue. Bluebird Ltd is the oldest: two invoices, 47 days.
Prepare an invoice for Bluebird for October support.
acc.draft_invoice {customer:"Bluebird Ltd", item:"Support, Oct 2026"}draft onlyDraft INV-0418 is in your accounting system, not sent. The accountant checks and sends it.
Bluebird paid $2,400 by bank transfer today.
acc.record_payment {invoice:"INV-0402", amount:2400}needs confirmationRecord $2,400 against INV-0402?
✓ confirmed by youPayment recorded. INV-0402 is now paid in full.
Can a customer on an annual plan get a partial refund?
kb.search {q:"refund annual plan"}200Yes, within 30 days and pro rata — “Refund policy”, section 3.2. Link attached.
Draft an FAQ entry about the new refund window.
kb.draft_page {space:"Support", title:"Refund window"}draft onlyThe draft is in Notion as a suggestion. It goes live after an editor accepts it.
Publish the updated refund policy.
kb.update_page {page:"Refund policy"}needs confirmationPublish the edit to “Refund policy”?
✓ confirmed by youPublished. The previous version stays in the page history.
estimate
Care plan from $250/mo
§06Security
An MCP server is a checkpoint, not a tunnel. It decides who may call which tool and keeps a record of every call.
audit.log
OAuth 2.1: the AI works under each user’s own account and role. A sales manager can’t read payroll by asking Claude nicely.
Each tool has its own scope; read-only by default, write tools added one by one.
The AI proposes the change, a person presses “Confirm”. Deletion isn’t exposed unless you ask for it.
Who, which tool, which arguments, what came back — searchable and exportable.
API keys live in your secret store, not in prompts or chat history.
Before launch we test the server with poisoned documents and tricky requests.
§07Delivery
Fixed scope, short loops: by the end of week one you test the server in your own AI client.
30 minutes on what your team asks most. You share API docs and a sandbox or a test copy.
2–3 read-only tools for one system, running in Claude, ChatGPT or Cursor on your test data.
Sign-in, roles, write tools with confirmation, audit log, hosting, tests and handover docs.
Optional ChatGPT app or Claude connector packaging; monitoring and updates on a monthly plan.
§08ChatGPT apps · Claude connectors
The same MCP server can ship as a ChatGPT app and as a Claude connector: the Apps SDK is built on MCP, and Claude plugins can bundle MCP connectors. ChatGPT has taken app submissions since 17 December 2025; Claude Marketplace opened on 23 September 2026 with 2,000+ connectors and plugins. We package the server, prepare the listing and go through review with you — approval is the platform’s call.
§09Pricing
Three fixed starting points. The final price goes into the contract after a 30-minute call.
MCP-P11 week
from $800
MCP-P22–3 weeks
from $2,000
MCP-C1monthly
from $250/mo
You pay for Claude or ChatGPT subscriptions and model usage in your own accounts. Several systems or a public directory app are quoted separately.
§10Compare
AI asks, server acts
trigger → fixed steps
one GPT, one API
Often you need both: an n8n workflow moves orders every night, and the MCP server lets a manager ask about them.
FAQ
Price, timing, security and ownership — the short answers.
A read-only prototype for one system starts at $800 and takes about a week. A production server with OAuth sign-in, roles, an audit log and hosting starts at $2,000 and takes 2–3 weeks. The care plan starts at $250 a month. Claude or ChatGPT subscriptions and model usage are paid separately, in your own accounts. The final price is fixed in the contract after a 30-minute call.
About a week to a working prototype in your AI client, then 2–3 weeks to production. A listing in the ChatGPT app directory or Claude Marketplace adds the platform’s review time, which we don’t control.
A list of 10–20 questions or actions your team wants, API docs or admin access to a sandbox or test copy, the roles of the people who will use it, and where it should run. Plus someone who can answer questions for half an hour twice a week.
The AI never gets passwords or a direct database connection. It calls only the tools we expose, under each user’s own permissions. Read-only is the default, writes need a person’s confirmation, and every call is logged. Before launch we test the server against prompt injection. If your data must stay in your infrastructure, the server runs in your cloud.
You do. The code lives in your GitHub or GitLab from day one, and after payment all rights are yours, along with the deployment notes. No licence fees, no lock-in. We sign an NDA on request.
Any client that supports MCP: Claude (desktop, web and Claude Code), ChatGPT (developer mode and apps), Cursor, VS Code with GitHub Copilot, and agents you build yourself. Which subscription plans allow custom connectors differs between clients and changes often — we check yours on the first call.
Yes. The ChatGPT Apps SDK is built on MCP, and Claude plugins can bundle MCP connectors, so one server can feed both. We package it, prepare the listing and go through review together with you. Approval is up to OpenAI or Anthropic.
We connect to a read-only database replica or to scheduled exports, or write a small adapter around your back office. Browser automation is the last resort, because it breaks whenever the site changes.
{ mcp.config }
Answer a few questions or paste the designer config. The developer who builds the server replies within one business hour.
Hire the MCP developer, not an agency
Myrado Studio is independent and not affiliated with Anthropic, OpenAI, Cursor or GitHub. Product names only describe compatibility.
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