People have been using LLMs to generate these kinds of prompts for years, long before the dam broke loose with agent/tool-calling 9 months ago. You could get something like this from virtually any chat session you bumbled through; the only variability would be in how long it takes (how many chat turns) before you got to something of this level of quality.
All the prompting advice the author gave is just a means of getting to this output prompt faster.
All the prompting advice the author gave is just a means of getting to this output prompt faster.