Comment by mattcollins

13 hours ago

On the other hand, AI coding tools make it relatively easy to set and apply policies that can help with this sort of thing.

I like to have something like the following in AGENTS.md:

## Guiding Principles - Optimise for long-term maintainability - KISS - YAGNI

I wrote something similar in a Claude Code instructions.md: "minimize cyclomatic complexity" What happened next? It generated an 8 line wrapper function called only once from a different file. So, I told it to inline that logic in the caller. The result? One. Line. Of. Code.

So, I asked it to modify its instructions.md file to not repeat that mistake. The result was the new line "Avoid single-use wrapper functions; inline logic at the call site unless reused"

instruction.md is the new intern.

  • It reminds me a lot of people who take Code Complete too seriously. "Common sense" is not an objective or universal statement unfortunately - plus, speaking for myself, what I consider "common sense" can change on the daily, which is why I can't be trusted adding features to my own codebase long term <_<.

Not sure if you're kidding or not, but to write great maintable code, you need a lot of understanding that a LLM just doesn't have, like history, business context, company culture etc. Also, I doubt that in it's training data it has a lot of good examples of great maintainable code to pull from.

  • Neither do most humans writing such code, i have seen llms generate better code than 90% of coders I have seen in the last 20 years

    • Awesome! However, the corporate is excited with using AI, making the coder the one who's at risk at getting fired for writing the exact same lousy (for the sake of the argument) code.

      Or worse: for not relying as much as possible to the AI who apparently can write just as bad code but faster!

      A subtle detail: you speak of coders, not software engineers. A SWE's value is not his code churning speed.

    • Admitting you've spent two decades on a career stuck working in the kind of sweatshops that hire people who can't actually code isn't much of a flex, and certainly doesn't lend a whole lot of credence to your argument.

    • This says more about you and the people you work with. I find engineers that have been at the company for a while are quite invaluable when it comes to this information, it's not just knowing the how but the when + why that's critical as well.

      Acting like people can't be good at their job is frankly dehumanizing and says a lot about your mindset with how you view other fellow devs.

    • Please let's stop with the "but some humans also suck at this so it's ok if LLMs also suck at it" argument. It doesn't add anything to the discussion.

  • He isn't kidding. I have a directive to write the shortest, least complicated, readable business code and it makes a huge difference

    • Sometimes, as in the bilsbi's top level comment, the solution is to use a free tool/library/product that already exists. The solution is not always to write new code, but the agent will happily do it.

      Maybe that's "the manager's job", but that's just passing the buck and getting a worse solution. Every level of management should be looking for the best solution.

I wrote something similar in a Claude Code instructions.md: "minimize cyclomatic complexity" What happened next? It generated an 8 line wrapper function called only once from a different file. So, I told it to inline that logic in the caller. The result? One. Line. Of. Code.

So, I asked it to modify its instructions.md file to not repeat that mistake. The result was the new line "Avoid single-use wrapper functions; inline logic at the call site unless reused"

instructions.md is the new intern.