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A CreateMessageHandler, or an ElicitationHandler for a form elicitation, that returned nil, nil made the client dereference the nil result and crash. CreateMessageWithToolsHandler and URL elicitation sent the nil to the server instead. Report an error naming the handler in all four cases, as readResource does for a resource handler.
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A sampling or elicitation handler returning
(nil, nil)could panic in the client or send a null result back to the server. These handler paths report-32603by wrappingjsonrpc2.ErrInternal, while preserving errors returned by the handler.Tests cover both sampling handlers and form/URL elicitation. Four direct tests check the error code and sentinel; eight multi-round-trip cases check propagation on 2026-07-28 and 2025-11-25 sessions.
Validation after integrating current main:
go test -race ./...,go vet ./..., CI-pinnedstaticcheckv0.6.1, formatting, and diff checks pass locally on Go 1.25.6. The latest public commit also passed all nine GitHub checks, including Go 1.25/1.26 tests, race, client/server conformance, lint, and CodeQL.