Coding prompts

This code should [what it should do] but instead [what happens]:
[paste code]

Explain what is wrong in simple words, give the fixed code, and tell me how to test that it works.

Add [feature] to this project. Follow the existing code style, keep changes small, update or add tests that prove it works, and list every file you changed with one line on why.

Explain this codebase to a new developer: what it does, the main folders and what each holds, how a request flows from start to finish, and where I would make a change to [feature].

When I [steps], I get [error or wrong result]. Find the cause, explain it in two sentences, fix it with the smallest change, and add a test so it cannot come back.

Write a commit message for these changes: a short summary line under 60 characters, then a short paragraph on why the change was needed.