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Source: [Hacker News](https://www.geekwire.com/2026/amazon-blocks-metas-muse-ai-assistant-in-new-standoff-over-agentic-shopping/)
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Submission for the DEV x Sanity Challenge, Path One. What I Built JudgeStack answers Magic: The Gathering rules questions, but the answer itself is only half the job. It also works out which source has the authority to decide that answer.