[Bug]: JSON schema with multiple allOf branches is silently ignored by the xgrammar structured-output backend
![[Bug]: JSON schema with multiple allOf branches is silently ignored by the xgrammar structured-output backend](https://www.chat-gpts.plus/wp-content/uploads/2026/10/56556-d943f148-768x403.jpg)
当你在 vLLM 中使用 xgrammar 结构化输出后端(structured-output backend),并且 JSON schema 里存在多个 allOf 分支(或 anyOf / oneOf 与约束关键字相邻)时,xgrammar 可能会静默忽略这些约束,生成不受限制的 JSON,而
![[Bug][HiSparse] Decode engine dies with cudaErrorLaunchFailure in the host-mirror path under sustained P/D host imports](https://www.chat-gpts.plus/wp-content/uploads/2026/10/56699-3a771de8-768x403.jpg)







