语法分析：Until the details are made public of the agreement Shul

1.前半句（即until引导的时间状语从句）的谓语是：are made.
因为此从句是一个被动句,所以其谓语动词是：be + 过去分词made
形容词public为主语补足语（主动句中为宾语补足语）
2.worked out是修饰先行词the agreement的定语从句中的谓语动词.
3.整个句子较为复杂,梳理如下：
= It will not be known what the prospects for a summut truly are until the details are made public of the agreement Shultz and Shevardnadze worked out.
大句是一个not...until...句型.
1）主句：It will not be known what the prospects for a summut truly are
其中,it为形式主语,what the prospects for a summut truly are是真正的主语（即主语从句）
2）（时间状语）从句：until the details are made public of the agreement Shultz and Shevardnadze worked out
从句中的主语成分为：the details of the agreement Shultz and Shevardnadze worked out
该主语的中心词是：the details,介词短语of the agreement修饰the details做其后置定语,而定语从句Shultz and Shevardnadze worked out又做定语修饰the agreement.
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and shevardnadze worked out 和until后一句一样也是从句，worked out 是从句中的动词，意为精疲力竭了