Support extensions SEP-2133
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调研方向
首先定位 ClientCapabilities 和 ServerCapabilities 的 Java SDK 表示形式及序列化路径。将它们与 issue 中链接的 SEP-2133 schema 以及所引用的 Python 和 TypeScript 实现进行比较。当两个 capability 对象都支持可互操作的扩展字段，且不会将其与实验性字段混淆时，即表示完成。
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描述
SEP-2133 Extensions was recently approved through the SEP process.
This has resulted in a new 'extension' fields in ClientCapabilities and ServerCapabilities.
Note that the capabilities extension fields are not in the 11-25-2025 schema and are distinct from the 'experimental' field...which is in the 11/25/2025 and the current Java SDK.
Expected Behavior
Support the extension fields in ClientCapabilities and ServerCapabilities so that extensions can be made connect interoperable with similar extensions in other language sdks (e.g. python and typescript).
Current Behavior
Explained above.
Context
I am in the process of implementing an extension to support grouping of primitives I already have a similar extension in python and for typescript. To make python clients that support the extension to connect to java servers that support the groups extension it's necessary that the new capabilities extension field be supported by the Java SDK.
In the immediate term I'm working around this by using the existing 'experimental' capabilities field. But interoperability with other sdks won't work.
If a pr implementing this feature is desired, I would be willing and able to create one. Please LMK on this issue or in direct conversation if you would like me to contribute this.
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modelcontextprotocol/java-sdk 的其他 Issue
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area/transport bug P2
难度 2/5 1-3 小时 新手友好度 88/100
modelcontextprotocol/java-sdk#1136 ·
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area/client bug P2
难度 2/5 1-3 小时 新手友好度 84/100
modelcontextprotocol/java-sdk#1124 · 1 条评论 ·
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ServerCapabilities.logging is added unconditionally, overriding the caller's explicit capabilities 未关闭bug P2 ready for work
难度 2/5 1-3 小时 新手友好度 68/100
modelcontextprotocol/java-sdk#1086 · 1 条评论 ·
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enhancement good first issue P3
难度 2/5 1-3 小时 新手友好度 82/100
modelcontextprotocol/java-sdk#1067 ·
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bug P2 ready for work
难度 2/5 1-3 小时 新手友好度 74/100
modelcontextprotocol/java-sdk#898 · 1 条评论 ·
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