Small tools are appealing because they promise to make one task easier. But “small” is not just a line-count goal. A tool stays small when its purpose and limits are easy to see.
That starts with a narrow job. A script that renames a batch of files can be excellent at that job without also becoming a scheduler, a configuration platform, and a general-purpose automation engine.
Make the edges obvious
Before adding an option, ask what a person needs to know to use the tool safely:
- What inputs does it accept?
- What will it change?
- How can someone preview or undo the change?
- What happens when an input is missing or invalid?
These questions are part of the interface, even when the interface is only a command line. Clear output and a useful error message are often more valuable than another feature.
rename-files --preview ./photos
rename-files --apply ./photosThe first command makes the boundary visible: look at the proposed change before applying it.
Let the next need stay separate
If a second use case appears, it does not automatically belong in the same tool. A small, stable core can be combined with another tool later; a vague tool with overlapping responsibilities is harder to test and harder to trust.
A good boundary is a feature. It tells you what the tool promises—and what it does not.
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