TL;DR:
Ask for a list of issues, not a rewrite. The letter stays in your voice.
You make the changes, so you know what the final text says.
Sending is a step that needs your yes, every time.
A cover letter is open in a document and the send button is one click away. You have read it three times and your eyes now skip over mistakes. A second reader is useful, and an assistant is available at any hour.
The danger is the way you ask. If you say fix this, you may get back a letter that does not sound like you. This article shows a better way.
The short answer: ask for issues, not for a rewrite
There are two requests. Rewrite this gives you new text, and you must now check all of it. List the problems you see gives you a short set of points, and you decide what to do with each. The second keeps your voice, keeps your work yours, and is faster to check.
What happens step by step
The assistant reads the text, from the document or from what you paste.
It looks for categories of issue: spelling, grammar, unclear sentences, repeated words, tone, missing details.
It lists each with the exact words and where they are.
You go through the list and decide on each one.
You edit the text yourself.
You send it yourself, or you confirm when asked.
Walk-through: a cover letter open in a document
This is a made-up letter. The first line reads: Dear Ms. Alvarez, I am writting to apply for the Library Assistant position, which I seen advertised on your website.
You say: Check this letter for mistakes. List them and do not rewrite anything. The assistant points to these:
writting in the first line is a spelling error. It should be writing.
which I seen advertised is a grammar error. It should be which I saw advertised, or which I saw advertised on your website.
The second paragraph says I am a hard worker and I am hard working in two sentences in a row. That is a repetition.
The letter names the Library Assistant position at the start but the closing refers to the Reading Room Clerk position. One of them is wrong.
The last one is the most valuable. It is not a spelling issue, it is a fact about your own letter, and sending the wrong job title would be embarrassing. You check the advert, find the right title, and fix it.
You then edit each point yourself. The letter stays in your words. Afterwards you may ask the assistant to check once more, and it should report that the issues are gone.
Reading aloud is the other half of the method. Your eyes expect what you meant to write and often see it even when the page says something else, which is why a computer-flagged slip like writting survives three readings. Your ears are less forgiving. Read the letter aloud slowly, and mark every place where you stumble. A stumble is usually a missing word, a clumsy sentence or a typo.
Give the checker the context too. A letter for a library job and a letter to a friend should not be held to the same tone. Say who the reader is and what you want them to do, and the feedback on tone and length will fit.
Questions that get better feedback
Which sentences are unclear? Mark them, do not fix them.
Does the tone fit a job application?
Is there anything I have said twice?
Do the names, dates and titles match everywhere they appear?
What would a reader be left wondering?
Specific questions get specific answers. Check the answers, because an assistant can flag something as wrong that is a deliberate choice of yours.
It should not send without asking
Sending an email or submitting a form cannot be undone. A good assistant that can work in your mail or browser should show you the final text and wait for your yes. DuckyHelper, whose ability to act in apps is in early access, is built to ask first before it sends a message, and you can always do the sending yourself.
What it can't do
It cannot know your facts. It can spot that two titles differ but not which one is right.
It can miss errors, especially a correctly spelled wrong word, like form for from.
It can flag correct text as wrong. Trust your own judgment on style.
It cannot decide whether you should send the letter at all.
Privacy and control
A cover letter contains your name, contact details and work history. Before sharing a document with an assistant, check what the tool does with the text and whether it keeps it. Take out details you do not need to share, such as a home address, when checking only the writing. For work documents, check your employer's rules before using any outside tool.
Try it yourself
Take a short message or letter you are about to send.
Ask: list the mistakes and unclear sentences, and do not rewrite them.
Fix each one in your own words.
Read it aloud once. Then send it yourself.
Frequently asked questions
Why not let it rewrite the whole thing?
You can ask for a rewrite, but then you must check every changed word, and the text may lose your voice. A list of issues is quicker to check.
Can it send the email after checking?
Only if you allow it, and a careful assistant asks first. You can always send it yourself.
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