OoO-Spec: Out-of-Order Semantic Speculation for Fast Tool Calling
LLMs generate tool calls token by token, even though the function choice and argument values can often be predicted in parallel from the request and tool schema. ToolSpec reduces this cost by drafting schema tokens and retrieving earlier calls, but cannot propose request-specific values absent from either source. We present OoO-Spec, which computes these missing semantics out of order. At request arrival, a Qwen3-0.6B sidecar predicts the function choice and all schema-defined argument slots in one parallel request-level wave while the target begins ToolSpec decoding. The runtime joins the slot values, renders the resulting call as text, and exposes it to subsequent candidate-construction...
| Authors | Zhiheng Zhang, Mujie Xu, Feiyu Sun et al. |
|---|---|
| Primary category | cs.CL |
| Published | 1 August 2026 |
| Last updated at source | 1 August 2026 |
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