PromptBreeder — self-referential prompt evolution (2023)

The prompt

Extends EvoPrompt's genetic-algorithm approach with one twist: the mutation-prompt itself also evolves alongside the task prompt, so the system's own mutation strategy improves over time. Optimizes a single prompt. No official repo exists — only unofficial, community reimplementations.

Expected result

In principle, a prompt evolved by an increasingly effective mutation strategy — in practice, reproducing this means piecing together unofficial code yourself.

Why it works

Largely unmaintained with no official codebase, so setup effort is high and unreliable. Skip actually installing it — but the "evolve the mutator too" idea is worth borrowing conceptually if you're building your own evolutionary prompt-optimization loop.