hey @Kho for Claude Fable 5 specifically, we’re still waiting on AWS Bedrock support (see this thread: https://forum.cursor.com/t/bedrock-fable-5-unable-to-reach-the-model-provider/162844). Use Fable from the normal picker with Bedrock off for now. The null toolSpec bug in the OP is a separate confirmed issue for non-Anthropic models team is on it.