Speculative PTC: Overlapping tool calls with code generation for faster agents
a1zhang · x · 2026-09-02
Alex Zhang proposes Speculative Programmatic Tool Calling (sPTC), a technique to mitigate high tool latency in agent workflows.
- Core Mechanism: While the harness streams generated code, it parses partial output and speculatively pre-launches safe tool calls (e.g., sub-agents or search APIs). If the final code confirms the call, the cached result is reused.
- Impact: It effectively acts as a lightweight JIT layer for agent programs. Experiments with RLMs show speedups of up to 1.2x, depending on trajectory and tool latency.
- Use Case: Best suited for code-execution-based harnesses (CodeAct-like), especially those involving high-latency sub-model invocations.
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