fs_edit
Changes part of a file in your preview by replacing exact text, so a small fix stays small. Every change is recorded and can be undone.
Edit a file · Can change or delete
Replace an exact string in a file. old_string must match exactly once (include surrounding lines to make it unique) unless replace_all is set. Fails without changing anything if it is not found.
For your AI: this page as Markdown · llms.txt