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dspy-gepa-optimizer

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Optimize DSPy programs with dspy.GEPA — a reflective/evolutionary optimizer to consider against task-specific baselines within an authorized evaluation budget. Use when the user says optimize, compile, GEPA, reflective optimization, or "make this program better" and a DSPy program + metric + trainset exist.

skills/dspy-gepa-optimizer/SKILL.md

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# DSPy GEPA Optimizer (3.2.x)

GEPA (Genetic-Pareto) is a reflective optimizer: it mutates a program's instructions and few-shots using an LM that reads your metric's **textual feedback** and proposes improvements. It maintains a Pareto frontier across validation tasks and is the default recommendation for complex DSPy workloads in 2026.

> The expansion "Genetic-Evolutionary Prompt Adaptation" that appears in some AI-generated summaries is an LLM-hallucinated backronym. The [paper](https://arxiv.org/abs/2507.19457) defines GEPA as Genetic-Pareto; the "Pareto" is load-bearing (GEPA keeps a frontier of candidates rather than collapsing to one).

## Prerequisites — do these first or GEPA wastes rollouts

1. A `dspy.Module` that runs end-to-end (see `dspy-fundamentals`).
2. A rich-feedback metric returning `dspy.Prediction(score=float, feedback=str)` (see `dspy-evaluation-harness`). Informative feedback can support reflection; evaluate optimizer benefit on the task rather than assuming superiority. A dict with the same fields still crashes `dspy.Evaluate` under DSPy 3.2.1 — use `dspy.Prediction`.
3. `trainset` and a **separate** `valset`. For GEPA, maximize training examples and keep validation just large enough to represent the downstream distribution; do not reuse the same examples for both.
4. A `reflection_lm` — a strong LM (often the same or stronger than the task LM) set to `temperature=1.0` for creative proposals. Current DSPy docs use a GPT-5-class reflection model with a large output budget.

## Canonical call
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