Enable configuration of the JSON-RPC error object to be returned.
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Currently, the `modelcontextprotocol/ruby-sdk` delegates the handling of JSON-RPC error objects to the `json-rpc-handler`, which prevents flexible configuration of error objects returned by the SDK. For example, The logging utility should return the `JSON-RPC` error object `-32602`, `Invalid params`, when the log level is invalid. https://modelcontextprotocol.io/specification/2025-06-18/server/utilities/logging#error-handling Currently, however, the `modelcontextprotocol/ruby-sdk` side cannot freely configure the `Invalid params` error object. Therefore, we implemented a solution in which you can return the intended `JSON-RPC` error object by including code in the error class and raising it. The modelcontextprotocol/ruby-sdk could define and return `JSON-RPC` error objects directly. However, I believe that delegating this responsibility to the `json-rpc-handler` keeps things simpler. For this use case, setting `ErrorCode::InvalidParams` flexibly would have been sufficient. However, I implemented it this way because I thought that allowing the flexible invocation of other error classes would make it more universally reusable.
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Motivation / Background
This PR is a proposal.
Currently, the
modelcontextprotocol/ruby-sdkdelegates the handling ofJSON-RPCerror objects to thejson-rpc-handler, which prevents flexible configuration of error objects returned by the SDK.For example, The logging utility should return the
JSON-RPCerror object-32602,Invalid params, when the log level is invalid.https://modelcontextprotocol.io/specification/2025-06-18/server/utilities/logging#error-handling
Currently, however, the
modelcontextprotocol/ruby-sdkside cannot freely configure theInvalid paramserror object. Therefore, we implemented a solution in which you can return the intendedJSON-RPCerror object by including code in the error class and raising it.The
modelcontextprotocol/ruby-sdkcould define and returnJSON-RPCerror objects directly. However, I believe that delegating this responsibility to thejson-rpc-handlerkeeps things simpler.For this use case, setting
ErrorCode::InvalidParamsflexibly would have been sufficient.However, I implemented it this way because I thought that allowing the flexible invocation of other error classes would make it more universally reusable.