Effect service conventions: ThreadManagementThreadNotSendableError carried an Archived/NoSteerableRun reason union and switched on reason._tag inside the message getter. Modelled as two error classes (ThreadManagementThreadArchivedError, ThreadManagementNoSteerableRunError); both still map to the MCP thread_not_sendable failure code. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Julius Marminge committed on 8/29/2026, 6:01:54 AMparent1b7cb4e
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