Super annoying behavior that custom instructions in Cursor doesn’t appear to prompt away
- Telling me the code it will modify before writing the modified code
- Ignoring custom instructions
I use Sonnet 3.5 daily, and I just started noticing this odd behavior that is mega annoying, and eats into my limited output tokens.
When I ask Sonnet 3.5 to do something in Cursor, it first repeats what it will do, and then it does. I have the following custom instructions too
Do not specify that you are going to modify a piece of code and writing the code out. For example, do not say "we'll update [file].. we'll modify this..". Just directly modify the code without specifying what code you are going modify. You are wasting my time and my tokens.
But it still repeats it.
Is this a new behavior, or am I crazy and just started noticing it?
Another thing is, Cursor does not appear to actually inject custom instructions into Sonnet 3.5 (haven’t tried other LLMs). For example, I tell Cursor explicitly not to add comments to the code it writes, but it still adds little comments sometimes. As far as I know, this has always happened since I started using Cursor, so I don’t think this is new behavior.
Why does Cursor’s custom instructions not actually work?
