The first time I let Claude Code take a serious auth change straight from prompt to patch, it changed nine files. Three of them were subtly wrong. The compiler was happy. The behavior was not.
The mistake was not using an agent. The mistake was letting implementation start before I understood the approach.
Claude Code plan mode fixes that specific failure. It splits the work into two steps: decide what should happen, then change the code. For small edits, the extra step is unnecessary. For anything with real blast radius, it is the difference between reviewing an approach and untangling a bad patch.
I use it constantly in Nimbalyst, the desktop workspace I build around Claude Code and Codex. Any time the work touches auth, sync, migrations, agent sessions, or more than a couple of files, I want the plan in front of me before the first edit lands.
What Claude Code plan mode does
