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Building a Custom MCP Server: Architecture and Implementation Patterns (ANSWERED)

Project BasedMCPMedium14 min read

Building a custom MCP server is a common system-design follow-up to "what is MCP?" Strong candidates describe end-to-end architecture, not just SDK boilerplate.

TL;DR — Quick Answer

Implement an MCP server that exposes typed tools/resources over stdio or HTTP/SSE, validate inputs with JSON Schema, proxy to your internal API with service credentials, and test with contract tests plus a mock host client.

The Interview Question

Walk through how you would design and implement a custom MCP server for an internal API. Cover transport, tool schemas, auth, and testing.

Deep Explanation

Building a custom MCP server is a common system-design follow-up to "what is MCP?" Strong candidates describe end-to-end architecture, not just SDK boilerplate.

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