alt Hacker NewsWhere this result is actually interesting and relevant is when a coding agent splits a large source file into multiple smaller files. Opus + Claude Code will try to recite long sections of source code from memory into each of the new files, instead of using some sort of copy/paste operation like a human would.
Moving a file is a bit easier. LLMs may sometimes try to recite the file from memory. But if you tell them to use "git mv" and fix the compiler errors, they mostly will.
Ordinary editing on the other hand, generally works fine with any reasonable model and tool setup. Even Qwen3.6 27B is fine at this. And for in-place edits, you can review "git diff" for surprises.
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If you’re using LLMs for agentic work it is absolutely essential that you have a robust set of tools for them to use and the correct instructions to prompt their use.
The LLM will come up with stupid ways to do things, common sense doesn’t exist for AI.
> And for in-place edits, you can review "git diff" for surprises.
I don't let AI touch git anyway, and I always review the diff after it generated stuff. If it modifies my documentation, I always want to check if it messed with the text instead of just added formatting.