Mcptool outputSchema Missing field description

[fenglex]

my code

public record CityPopulation(
        @JsonPropertyDescription("城市的名称，例如：北京") String city,
        @JsonPropertyDescription("城市的人口，单位为：万人") int population
) {
}


# tool
@Service
public class PopulationService {
    @McpTool(name = "getCityPopulation",
            description = "获取城市的人口情况. ",
            generateOutputSchema = true
    )
    public Mono<CityPopulation> getCityPopulation(@McpToolParam(description = "城市的名称，如：北京,上海") String city) {
        // 使用 Mono.fromCallable 来包装同步逻辑，使其在异步环境中安全执行

        McpSchema.CallToolResult build = McpSchema.CallToolResult.builder()
                .addTextContent("")
                .build();


        return Mono.fromCallable(() -> {
            // 在这里可以执行任何耗时的操作，比如查询数据库
            return new CityPopulation(city, 100);
        });
    }
}

use fastmcp list tool get tool info

name='getCityPopulation' title='getCityPopulation' description='获取城市的人口情况. ' inputSchema={'type': 'object', 'properties': {'city': {'type': 'string', 'description': '城市的名称，如：北京,上海'}}, 'required': ['city']} outputSchema={'$schema': 'https://json-schema.org/draft/2020-12/schema', 'type': 'object', 'properties': {'city': {'type': 'string'}, 'population': {'type': 'integer', 'format': 'int32'}}} icons=None annotations=ToolAnnotations(title='', readOnlyHint=False, destructiveHint=True, idempotentHint=False, openWorldHint=True) meta=None

Outputschema is missing a field description, how can you add a field description