Testing Your MCP Server Like You Mean It

The final part of the ZeroMcp series. Part one covered exposing your ASP.NET Core API as an MCP server. Part two covered everything that's grown since. Part three covered ZeroMcp.Relay for any OpenAPI-backed API. This one closes the loop on the question you should be asking by now: how do I test all of this? I should probably have led with this from the start: by trade, I'm a test automation architect who specialises in tooling. That's not incidental context — it's why ZeroMcp exists the way it does, a way to provide consistent endpoints without the "human error" factor. When you spend a career building test infrastructure, a particular instinct gets hard-wired: you don't consider something done until you can verify it works and detect when it stops working. Every tool in the ZeroMcp ecosystem was built with that instinct operating in the background. The [Mcp] attribute runs your real pipeline so your real tests still pass. The Tool Inspector UI lets you execute tools and inspect resul