MCP endpoints in controllers (SSE transport, Server side)

[handicraftsman]

Drafting it real quick, but what if, instead of having a single MCP endpoint, it was possible to define a controller similar to this one?

@MCPController
@RequestMapping("/mcp/controller/")
public class HelloMCPController {
  @MCPMapping("/{endpointId}")
  MCPEndpointConfig endpoint(@PathVariable String endpointId) {
    return MCPEndpointConfig.builder()
      .withTools(...)
      .build();
  }
}

Reasoning for this is ability to define what tools will be available on this endpoint based on a dynamic user-provided configuration. Additionally, with Multi-agent MCP clients, this would allow providing an endpoint that is fine-tuned for the given agent specifically, with tools that are only needed for that agent.
That is especially reasonable for large products.

As a note - I haven't checked exact API implementation just yet, so class names are taken out of the blue, but I have already noticed there's no support for the main idea of this code snippet.