I Hope @Tool Support DescriptionFactory Config，To Solution Dynamic description Scene

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Expected Behavior

我在编写MCP的时候，我希望Tool注解中，可以动态去读取一些外部的数据，从而拼接出一个动态的tool注解描述中的提示词，这样提示词中也会包含一些关键的元素、或者基础配置，这样AI在生成参数的时候，不需要在额外调用接口，避免让MCP客户端发送多次请求获取一些依赖的基础的公共配置参数。

Current Behavior

当前Java中的@Tool注解仅支持静态配置的description字段。不能动态拼接

Context

我希望当前@Tool 注解、@ToolParam注解可以提供一个descriptionFactory的字段，这样外部开发者可以配置实现的具体逻辑，然后工具描述可以更灵活的控制和组装一些丰富的参数，从而某些情况下不需要客户端多次调用接口。

Start by locating the @Tool and @ToolParam annotation definitions and the code that reads their static description fields. Review how tool descriptions are assembled for MCP, then determine how a configurable descriptionFactory could supply dynamic content and how completion would be verified for both annotations.