Code Explanation

A code explanation prompt that forces the model to explain intent, flow, edge cases, and likely risks in plain language.

Reviewed: 2026-03-18

Use this when you need a reliable walkthrough of unfamiliar code, including what it does, why it was written this way, and what can go wrong.

Prompt Template

Explain the following {language} code for a {target_audience}.

What I need:
- A one-paragraph summary of what it does
- A step-by-step walkthrough of the control flow
- Important inputs, outputs, and side effects
- Edge cases or failure modes
- Any design tradeoffs or code smells worth noticing

Code:
```{language}
{code}
```

Keep the explanation grounded in the actual code. Do not invent behavior that is not shown.

Customize the variables before using the template in production workflows.

Best for

Understanding inherited code before editing it
Preparing onboarding notes for a teammate
Reviewing tricky control flow or algorithmic code

Expected output

High-level summary
Step-by-step flow explanation
Inputs, outputs, and side effects
Edge cases and possible smells

Variables to customize

language

Language of the snippet

Example: Python

target_audience

Who the explanation is for

Example: mid-level backend engineer

code

The code to analyze

Example: function body, class, or module excerpt

Optimization tips

Set the audience level to control depth and jargon.
If the file is long, narrow the code excerpt and ask about one function at a time.
Ask for a call-flow diagram if the code is event-driven or asynchronous.

Example use case

Explain a retry helper used in an API client to a mid-level TypeScript engineer.

Expected result

The model gives you a practical walkthrough of the retry loop, backoff behavior, and likely failure points.