Four dev roles

Split spec, repro, pull request, and review. A person approves the spec and the merge. The reviewer bot does not write the PR.

For: People letting bots touch code.

Source recipe, including the prompt: https://github.com/sit-in/awesome-grokbot-playbooks/blob/main/examples/dev-four-roles.md

Six parts: scene, inputs, steps, prompt, output, pitfalls. External actions still need a person.