Rules vs prompts: what to write once and what to say every time
·5 min read
Some instructions belong in the message. Some belong in a rule your assistant reads every time. A simple test for telling them apart, with a before and after.
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Build one reusable skill end to end: pick the task, write the file, add it to Claude, ChatGPT, Cursor, or Codex, and test that it fires. No code.