What it does
A single system prompt file that you append to Claude Code sessions to change how Opus 5 communicates. It targets verbal tics, heavy headings and long outputs. It needs no build step or dependencies, and includes a side-by-side compare loop and diagrams explaining the prompt.
Use cases
- 01Make coding agent replies shorter and more direct
- 02Compare responses with and without the prompt
- 03Study a worked example of system prompt design