Signature-Design — Promote Prose → Typed Contract

"DSPy uses the field names as the only natural-language hint the optimizer has about intent before it sees data. Name them like you'd name function parameters in well-written code." — derived from [dspy.ai/learn/programming/signatures/], see references/R1-source-evidence.md

This skill is the decision layer, not the library layer. It tells you when a prose prompt has become "load-bearing" enough to deserve a typed Signature, and how to shape its fields. For the actual API (dspy.Signature, InputField, OutputField, Predict, ChainOfThought, compile, save) defer to the [[dspy]] skill; for the full program→evaluate→optimize SOP defer to [[agentsop-dspy]].

1. 何时激活 (When to activate)

Activate this overlay the moment a hand-written prompt crosses any one of three load-bearing thresholds.