Cactus Engineering Blog·· 26 天前评分44
Needle 结构化抽取实践：单工具调用语法保证 JSON 模式一致性
Structured JSON Extraction with NeedleExtraction in Needle is tool calling with one tool: declare the record, pass the text, get a typed object whose every field is a span of the passage. How the grammar guarantees the shape, how grounding keeps values honest, and how the same trick does classification.Noah Cylich · September 18, 2026 · 8 min read
导读
Needle 将结构化抽取实现为只声明一个工具的函数调用：语法约束保证模式符合而非请求满足，每个字段都是原文 span，可选字段无对应 span 时留空而非编造，同一机制可迁移做分类。
来源：Cactus Engineering Blog · cactuscompute.com