Understanding Handlers, Dispatch Tables, and Function Pointers If you’re learning Rust and you keep seeing the word handler, here’s the plain truth: A handler is just a function that gets called in response to something happening. That “something” could be: The key idea is you don’t call the handler directly.Some other part of the program […]

If you’ve ever looked at Rust MCP server code and seen ToolRouter<Self>, you might have been like “wtf, how can a struct contain itself? Isn’t that circular?” Let’s break down this elegant pattern that’s actually simpler than it looks. This does involve function pointers, which leads on to “why do we even want to use […]