This article is part of my MCP series. In the previous article, I covered authentication, tool permissions, secrets management, input validation, and tenant isolation for production MCP servers.
Read the previous article: Securing MCP Servers: 7 Essential Controls for Production
An MCP application may work perfectly during a local demo and still fail in production.
A tool may return the wrong data. An external API may time out. A blocking function may freeze the event loop. One tenant’s expired credentials may create repeated failures. The model may also select the wrong tool or generate invalid arguments.
These problems are difficult to diagnose unless testing and observability are built into the application from the beginning.
