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Breaking changes: - Registering duplicate Command/Query handlers in the same module raises DuplicateHandlerError (fixes #8) - HandlerNotFoundError(LookupError) replaces ValueError for missing handlers - UnknownDependencyError moved to lato.exceptions Added lato/exceptions.py with DuplicateHandlerError, HandlerNotFoundError, and UnknownDependencyError. Updated docstrings, docs, and tests. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
DuplicateHandlerError(fixes A command should be registered only by one handler #8)lato/exceptions.pywithDuplicateHandlerError,HandlerNotFoundError, andUnknownDependencyErrorValueErrorraises withHandlerNotFoundError(LookupError)for missing handlersUnknownDependencyErrorfromdependency_provider.pytoexceptions.pyCLAUDE.mdwith AI development guidelinesBreaking Changes
DuplicateHandlerError(TypeError)raised when registering a second Command/Query handler in the same module (previously silently allowed)HandlerNotFoundError(LookupError)replacesValueErrorfor missing handlers — code catchingexcept ValueErrorfor this case will need updatingUnknownDependencyErrorimport path changed fromlato.dependency_providertolato.exceptions(still re-exported from both)