What you are learning
Rolecast is designing stable system messages and role framing for assistants. The teaching focus is Roles (system prompts, roles, personas, tone control).
Work in order. Early parts set vocabulary and environment; later parts assume the earlier checkpoints.
How to use these lessons
Read the goal, open the matching GitHub folder, complete the lab or exercises, then return for the explanation. If a command fails, check you are in the numbered folder first.
Parts in order
Each chapter below is one checkpoint in this track.