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agentsop-cost-tiered-models

Split a multi-call LM workflow by cognitive load, not by accuracy: let one strong model make the few reasoning decisions and a cheap model do the many mechanical executions (Aider architect+editor, DSPy optimizer-LM vs task-LM, vLLM speculative draft+target, LangGraph supervisor+worker are the same shape). Use when designing or cost-optimizing a pipeline that calls an LM many times, when deciding which steps need a strong reasoner vs a cheap executor, or when adding an escalation valve for when the cheap tier degrades. Search keywords: reduce LLM cost, cheaper model, lower token cost, model cascade, route to cheap model, strong model plus cheap model, LLM cost optimization.

skills/agentsop-cost-tiered-models/SKILL.md

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# Cost-aware Model/Role Split — "强推理者 + 廉价执行者"

> 一句话:一条多次调用 LM 的工作流里,**少数调用需要推理,多数调用是机械执行**。让一个强模型做决策,让一个便宜模型干活——按认知负荷拆分,不是按"哪个更准"拆分。

> **统一声明**:Phase B 发现这个模式在 4 个 SOP 里以 4 个名字反复出现——DSPy 的 optimizer-LM vs task-LM、Aider 的 architect+editor、vLLM 的 speculative draft+target、LangGraph 的 supervisor+worker。它们是**同一个形状**。本技能把这个形状抽出来,命名为 cost-tiered models。详见 §7 跨框架对照。

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## 1. 何时激活 (When to activate)

任一情形成立时激活本技能:

- 工作流会**对 LM 发起多次调用**,且这些调用**认知负荷不均**——有的需要规划/推理/判断,有的只是改写、抽取、格式化、应用一个已定好的决定。
- 你正在为一条 LM 流水线**选模型**,并且默认想"全程用同一个最强模型"——这是本技能要挑战的反射。