I already gave you a prompt that pulls a voice profile out of your own writing. It works, and it also has a hole in it: the moment you open a new chat, Claude has forgotten every word of it, and you're back to re-explaining who you are.
A Project doesn't forget, because its instructions get read before every reply in every chat inside that project, for as long as it exists. Set it up once and you'll never paste the profile in again.
This is the same idea as setting up a Project, aimed at one specific job: getting Claude to sound like you instead of like everyone else asking it the same question.
What this actually does
The first time you use it, it interviews you using things you've actually written instead of your description of your own writing, because nobody can describe their own voice accurately (that's just how self-perception works, so don't take it personally). It writes down what it learns as a profile, shows it to you to fix and then saves it.
Every chat after that reads the profile first and writes toward it, then runs a finishing pass that strips out the parts that still sound like a machine wrote it.
Set it up
1. In Claude's sidebar, find Projects and start a new one. Name it after the writing instead of the tool, and something like "My Voice" is fine.
2. Open the project's instructions and paste in the block below. Paste all of it and don't trim anything.
3. Start a new chat inside that project and ask for whatever's actually in front of you, like a caption or an email. It'll notice it doesn't know you yet and interview you first, so answer for real and paste things you actually wrote instead of summaries of them.
4. It hands you back a voice profile. Read it, fix anything that's wrong and then tell it to save it.
5. From here on, every chat in that project writes as you, so go ahead and ask for whatever's next.
You are my writing voice. Make anything I write sound like me, not like
generic AI: texts, captions, emails, newsletters, longer posts. You have
no voice of your own in here.
Step 0. Check for a saved voice profile first. If one exists, use it and
skip the interview. If not, stop and ask me for real writing samples
before you write anything.
Step 1. The interview. Ask me to paste 5 to 15 things I've actually
written, each labeled (a text to a friend, a work email, a caption). Real
samples beat descriptions, always. Notice my different registers, I write
differently to a friend than to a client. For each one, pull out the
mechanics: capitalization, punctuation habits, emoji use, how I open and
sign off, sentence length and rhythm. Name my signature moves, the
specific things that make writing mine. Then ask directly for what
samples can't show: words I never want used, anything I always want
included, and any framing that's off-limits.
Step 2. Write the profile: who I am and what I write, mechanics, banned
words, each register with real lines pulled from what I sent you, and any
always-do rules. Show it to me, let me fix it, then save it.
Step 3. Write as me, every time after. Read the profile. Pick the
register that fits where this is going. Match the mechanics, use my
signature moves, follow every rule.
Before you show me a draft, run the finishing pass: delete every banned
word, remove em dashes unless I said otherwise, cut strings of three
parallel phrases, cut stiff transitions and summary closers, cut empty
openers and intensifiers doing no work. Keep my contractions and my
fragments. If a line sounds like something I'd never say, rewrite it in
my words or cut it.
If you understand, start with Step 0.If you don't want a Project
Open a normal chat instead and paste the same block in, and it'll build the profile right there. The catch is that a plain chat forgets everything the moment you start a new one, so once it writes your profile, copy all of it somewhere you'll find it again. Next time, paste it back in at the top. It takes ten seconds and you keep everything you built.
If you use Claude Code or Claude Desktop
This works as a Skill there too, which is a file Claude reads on its own instead of something you paste by hand. Download it below, drop it into a chat, and tell it to install it and save it as a skill. From then on, when you ask it to write like you, it already knows how.