--- type: Leaf title: Steps to build a custom MCP server for your business systems description: The five steps to connect an AI assistant to your own systems through a governed MCP server, from the tool list to a staging test with a real assistant. resource: https://nationaldigital.com.au/ai-automation/mcp-servers/steps-to-build-a-custom-mcp-server/ tags: - ai-automation - AI and automation - MCP servers and agent access - custom mcp server - build an mcp server - mcp server development steps - connect claude to internal systems timestamp: "2026-11-10T09:00:00.000Z" language: en-AU publisher: National Digital author: Cameron Young authorRole: CEO reviewedBy: Tara Buckley reviewedOn: "2026-11-10" readingTimeMinutes: 3 wordCount: 426 datePublished: "2026-11-10" dateModified: "2026-11-10" pillar: ai_automation canonical: https://nationaldigital.com.au/ai-automation/mcp-servers/steps-to-build-a-custom-mcp-server/ sourceCount: 2 --- *3 min read · Updated 10 November 2026* # Steps to build a custom MCP server for your business systems The five steps to connect an AI assistant to your own systems through a governed MCP server, from the tool list to a staging test with a real assistant. **Where this page sits** · 1 of 22 areas Areas this page covers - MCP & agent access [Open the full map on the homepage](/#systems-map-hero) **Quick answer:** A custom MCP server is built by mapping tools, scoping authentication, validating inputs, adding rate limits and logging, then testing with a real assistant. AI and automation · MCP servers and agent access *Quick answer* ## How is a custom MCP server built? *High confidence · Verified 10 Nov 2026* A custom MCP server is built by mapping the tools an assistant needs, scoping authentication, validating inputs, adding rate limits and logging, then testing with a real assistant before go-live. **Additional Context:** Each step keeps the assistant inside the permissions a staff member already holds in the source system. ### Sources - [Annual Cyber Threat Report 2024-2025](https://www.cyber.gov.au/sites/default/files/2025-10/Annual%20Cyber%20Threat%20Report%202024-25.pdf) — Average self-reported cost of cybercrime per report for Australian businesses: $80,850 (FY2024-25). *Model Context Protocol* ## Before the steps The sequence below is the one a business typically follows to connect an AI assistant to its own systems. The page on [MCP servers and agent access](/ai-automation/mcp-servers/) explains what an MCP server does and how it is secured once the systems are exposed. Assistants that act on a customer's behalf are covered under [AI agents](/ai-automation/ai-agents/), and the [AI Automation Assessment](/services/ai-automation-assessment/) is the fixed-fee starting point for a first build. *Step-by-step* ## Steps to build a custom MCP server Varies with the number of systems connected · Advanced The sequence a business typically follows to connect an AI assistant to its own systems through a governed MCP server. ### Supplies Needed - Documentation for each system being connected - A list of required tools and the permissions each one needs ### Tools Required - MCP SDK - OAuth 2.1 authorisation server - API gateway or reverse proxy - Logging and monitoring stack ### Steps 1. **Map the tools a business actually needs** List the specific lookups and actions an assistant should perform, such as checking stock or raising a ticket, rather than exposing a whole database. 2. **Design authentication and scopes** Set up authentication that matches each caller to the same permissions they already hold in the source system, not a shared service account. 3. **Build typed tools with validation** Define each tool's inputs and outputs so the assistant gets a structured answer or a structured error, never a raw database dump. 4. **Add rate limits and logging** Cap how often each tool can be called and log every request, so an unusual pattern of calls is visible before it becomes an incident. 5. **Test with a real assistant before go-live** Connect the server to Claude or ChatGPT in staging and run realistic queries, checking every answer cites the data it came from. **Summary:** A custom MCP server is built by mapping tools, scoping authentication, validating inputs, adding rate limits and logging, then testing with a real assistant. ## Ready to connect your systems to an AI assistant properly? National Digital scopes, builds and operates MCP servers so an assistant like Claude or ChatGPT can query your systems through typed tools, with authentication and logging built in from the start. - [Book a scoping call](https://calendly.com/cameron-at-national-digital/discovery) or · [1300 800 855](tel:+611300800855) ## References - Australian Signals Directorate. (2025). *Annual cyber threat report 2024-2025*. Written by [Cameron Young](/about/cameron-young/), CEO Reviewed by [Tara Buckley](/about/tara-buckley/), COO, on 10 November 2026 ## Related reading - [Multi-channel AI agents across web, app and messaging](/ai-automation/ai-agents/multi-channel-ai-agents/) - [AI agent analytics: what to measure and what to ignore](/ai-automation/ai-agents/agent-analytics/) ## Related **Parent:** - [MCP servers and agent access for your business systems](/okf/ai-automation/mcp-servers.md) # Citations 1. [Annual cyber threat report 2024-2025](https://www.cyber.gov.au/about-us/view-all-content/reports-and-statistics/annual-cyber-threat-report-2024-2025) 2. [Annual Cyber Threat Report 2024-2025](https://www.cyber.gov.au/sites/default/files/2025-10/Annual%20Cyber%20Threat%20Report%202024-25.pdf) — Average self-reported cost of cybercrime per report for Australian businesses: $80,850 (FY2024-25).