Use when authoring a petri-dish culture (Claude Code experiment), designing an A/B variant, picking a baseline cell, or shaping a probe prompt. Triggers on "write a culture", "petri-dish culture", "author a probe", "design an experiment for Claude Code", "A/B variant of <culture>", "baseline cell for <question>", or any task that produces a `config.yml` + `prompt.md` pair under `cultures/`. Also use when reasoning about whether a probe is well-shaped: multi-run discipline, structured result blocks, sequential-not-batched wording, preamble selection. Skip for running existing cultures (`petri-dish run`) and gem-internal code changes.
2026-05-28