Code reviewer

Review the following code for bugs, security issues and readability. List issues by severity, then show an improved version:

[paste code]
Works with: Claude, ChatGPT, Gemini

Explain this error

I got this error:
[error]

From this code:
[code]

Explain the cause in plain English, then give the minimal fix.
Works with: Claude, ChatGPT, Gemini, Grok

Write unit tests

Write unit tests for this function using [framework]. Cover normal cases, edge cases and error handling. Explain each test in one line.

[code]
Works with: Claude, ChatGPT