Document what a function does
Turn an undocumented function into a clear description and docstring — so the next person (or you in six months) does not have to reverse-engineer it.
Undocumented functions are technical debt that compounds: every reader pays the cost of figuring out the same thing again. Writing the docstring after the fact is tedious, which is why it rarely happens.
This tool reads the function and produces a clear explanation plus a ready-to-paste docstring describing its purpose, parameters, return value and side effects. You review and commit it, turning a black box into documented code with almost no effort.
The tool for this
🧩Legacy Code Explainer
Paste unfamiliar code and get a plain-English walkthrough, data flow and risks.
Frequently asked questions
Will it write a docstring in my language’s style? +
Yes. It produces docstrings matching common conventions (JSDoc, Python docstrings, Javadoc, etc.) for the language you paste.
Does it document parameters and return values? +
Yes — purpose, parameters, return value and notable side effects, so the doc is genuinely useful.
Should I review before committing? +
Always. It drafts accurate documentation, but you should confirm it matches the intended behavior.
Related tools
🧩Legacy Code Explainer
Paste unfamiliar code and get a plain-English walkthrough, data flow and risks.
📘README Generator
Turn project details into a polished, complete README.md.
🔬Code Review
Paste a diff or file and get a ranked review — bugs, logic, security, performance — with fixes.
Browse the full tools directory, or see all Panshi services.