Vent about your prompt fail
What I asked for
Fix the syntax error on line 42 of this CSS file. Do not change any other lines.
What it did instead
Rewrote my entire build pipeline in Grunt, converted all CSS to LESS, and deleted half my media queries.
How it made me feel
I stared at the git diff for ten solid minutes with my hands on my head.
Tell it: 'Only output the single replacement line with line number, no markdown fences, preamble, or surrounding code.'
Use a surgical diff prompt: 'Output ONLY a unified git diff hunk modifying line 42. Reject all other modifications or unsolicited refactorings.'
DeepSeek V3 is remarkably obedient for single-line surgical edits without attempting to rewrite your Grunt / build setup.