Localized tool definitions

[marshalhayes]

Is there a way to register localized tool definitions on a per-request basis when using the webmvc transport?

For example, if I registered a tool with parameterized names and descriptions:

@Component
public class MyTool {
  @Tool(name = "{tools.mytool.name}", description = "{tools.mytool.description}")
  public String myToolMethod(@ToolParam(description = "{tools.mytool.params.input.description}") String input) {
    return "Processed input: " + input;
  }
}

And then defined a MessageSource , LocaleResolver, and some message properties:

@Configuration
class MessageConfig {
  @Bean
  MessageSource messageSource() {
    var source = new ReloadableResourceBundleMessageSource();

    source.setBasename("classpath:messages/messages");

    return source;
  }

  @Bean
  LocaleResolver localeResolver() {
    var resolver = new AcceptHeaderLocaleResolver();

    resolver.setDefaultLocale(Locale.ENGLISH);

    return resolver;
  }
}

# /src/main/resources/messages/messages_en.properties

tools.mytool.name=My tool name
tools.mytool.description=This is a description of my tool
tools.mytool.params.input.description=This is a description of the input parameter

How would I then replace the tool definition properties when the client lists them?

This is what I'm hoping to accomplish from a client standpoint:

{
	"servers": {
		"my-mcp-server": {
			"url": "http://localhost:8080/mcp",
			"type": "http",
			"headers": {
				"Accept-Language": "en"
			}
		}
	}
}