---
'@modelcontextprotocol/core': patch
'@modelcontextprotocol/client': patch
'@modelcontextprotocol/server': patch
---

Convert remaining capability-assertion throws to `SdkError(SdkErrorCode.CapabilityNotSupported, ...)`. Follow-up to #1454 which missed `Client.assertCapability()`, the task capability helpers in `experimental/tasks/helpers.ts`, and the sampling/elicitation capability checks in `experimental/tasks/server.ts`.