XGrammar brings strict tool calling to SGLang and vLLM for DeepSeek V4.1
The announcement says Structural Tags enforce tool argument schemas—the rules for inputs passed to tools—in DeepSeek’s native format.
TLDR
A post announcing XGrammar’s strict tool calling for DeepSeek V4.1 says it uses Structural Tags to enforce tool argument schemas in SGLang and vLLM. It promotes that enforcement as a way to make agents more reliable and links to an explanation of Structural Tags and XGrammar’s GitHub repository.
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