How to Write a Great AI Prompt to Explain a Codebase or Function
Most people ask AI to "Explain this code to me"—and wonder why the output is mediocre. Here's how to write a prompt that actually gets you what you want on the first try.
"Explain this code to me"
Too vague—AI has to guess what you want
"Explain the following JavaScript function to a developer who is mid-level but unfamiliar with this codebase. Structure your explanation as: (1) what the function does in one sentence, (2) a step-by-step walkthrough of the logic, (3) any gotchas or non-obvious behaviour to be aware of. Use plain English, not academic language."
Specific, clear, ready to use
What makes the strong prompt better?
Calibrates depth to mid-level knowledge, avoiding over-simplification or jargon
Three-part structure means the explanation is always complete and ordered
Explicitly asks for gotchas which surfaces bugs or surprises proactively
Pro tips for explain a codebase or function prompts
- •Always specify your target audience or reader
- •Include concrete examples or context from your situation
- •Set tone guidance—formal, casual, witty, empathetic
- •Add length constraints to avoid rambling output
- •Exclude what you don't want (e.g., "no buzzwords", "no clichés")
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