Make Claude sound like you: build your voice doc

Your voice is already written down. It's scattered across your phone, and some of it you've only ever said out loud.

The problem

You ask AI for a caption and get "Unlock your potential ✨". You ask for a reel script and get something you'd be embarrassed to read on camera. So you rewrite it by hand, every time, and at that point what did the AI save you?

"Write in a casual, friendly tone" doesn't fix it. Neither does pasting three of your messages and hoping. What fixes it is what I did for my own business: a voice doc. One page that says how you write, how you talk out loud (those are different), the words you reach for, the words you never use, your rules, and a list of the tells that make writing sound like AI. Claude reads it before it writes anything for you.

Mine is about 350 lines and took a few weeks. Yours today is one page and 45 minutes, and it does most of the work.

What you need

  • 10 to 15 things you wrote: texts and WhatsApps to clients, 2 or 3 sent emails, 2 or 3 captions you posted, and one you wrote tired or annoyed
  • 2 or 3 minutes of you talking: a voice memo, a transcript of a reel or video you posted, or a voice note to a client. Most phones transcribe voice memos; the Claude app's microphone button works too
  • Your Project (from "Your Claude Project in 8 minutes"). No Project yet? A regular chat works, and you'll save the doc as a note
  • 45 minutes: Parts 1 and 2 today (25 minutes), Parts 3 and 4 tomorrow (20 minutes)
  • The free plan works

What's new

  • Aug 25, 2026 Settings > Memory shows what Claude remembers about you, topic by topic, and you can edit or delete any of it. Memory is on by default on Free, Pro and Max. If Claude saved a wrong idea of how you talk, fix it there. Your voice doc still wins: you wrote it, on purpose. (Anthropic)
  • Skills work on the free plan. A skill is a set of instructions Claude loads by itself when it's relevant. Once your voice doc is done, you can turn it into one so it works in every chat, not just one Project (optional, step 11). (Claude Help Center)

Steps

Part 1. Gather (15 minutes)

  1. Make a note called "My voice samples" with two headings: WRITTEN and SPOKEN.
  2. Under WRITTEN, paste 10 to 15 things you wrote. The rushed ones are the good ones. What you wrote calmly is already edited; what you wrote between errands is you. Skip your "About me" page and anything someone else edited for you.
  3. Under SPOKEN, paste 2 or 3 minutes of you talking: a voice memo transcript or a reel transcript. Don't clean it up. Leave the run-on sentences, the "you know," the place where you corrected yourself mid-sentence. That's what Claude needs to write scripts that sound like you out loud.
  4. Clean both: delete last names, phone numbers, addresses and anything private about clients.

Part 2. Build the voice doc (10 minutes)

  1. Open your Project and start a new chat. Paste Prompt 1 with your samples where the brackets say.
  2. Read what comes back twice. Put a check next to what's you and an X next to what isn't. Tell Claude every X ("I never use exclamation points with new clients") and ask for the corrected doc. Your corrections are the most valuable part. Claude can describe you; only you can say where it got you wrong.

Part 3. Rules and the never-list (10 minutes, tomorrow)

  1. In the same chat, paste Prompt 2 and fill in your rules. It adds them to the bottom of your doc, with a list of AI tells: em dashes everywhere, "it's not just X, it's Y," everything in threes, "unlock" and "elevate," emoji bullet points.
  2. Cross out any tell you actually use on purpose. If you really do say "let's dive in," keep it. The list is yours.

Part 4. Save it and test it (10 minutes)

  1. Copy the whole doc. In your Project, click Set project instructions, paste it under a heading YOUR VOICE, and add Prompt 3 (the VOICE CHECK shortcut) at the end. Save.
  2. Run Prompt 4, the blind test. Claude writes three short messages; you add one real one of yours; someone who knows you guesses which is real. If they can't tell, you're done. If they can, whatever gave it away goes back into the doc.
  3. Optional, to use your voice in every chat and not just this Project: in the same chat, ask "Turn my voice doc into a skill named my-voice, with a SKILL.md, and give me the ZIP." Then go to Customize > Skills > + > Create skill > Upload a skill. Skills need code execution turned on in Settings.

The prompts

Prompt 1. Your voice doc

Fill in the [BRACKETS], then paste it into Claude
Below are things I wrote and a transcript of me talking. Build my voice doc: a description so exact that a stranger could write as me. Don't compliment me. Describe me.

Use these headings:

HOW I WRITE
- Sentence length and shape. Short and clipped, or long and stacked?
- Formality, 1 to 10
- How I open a message. How I close one.
- My punctuation habits (lowercase? "!!"? "..."? no periods?)

HOW I TALK (from the transcript, not the writing)
- How my spoken sentences run. Where I correct myself, what I use to connect thoughts ("right," "so," "and")
- For scripts I'll read out loud: what to keep so it sounds like me, and what to cut so it isn't filler

WORDS I REACH FOR
- Phrases I repeat without noticing, with the sample each one came from
- Split them: with clients, and with friends

WORDS I NEVER USE
- Words that would sound wrong coming from me, based on what's missing from my samples

WHEN I SWITCH LANGUAGES (skip if I only use one)
- When, and why at that moment

THREE EXAMPLES
- Copy three of my samples exactly as written: one warm, one about money, one where I was firm

If I sound insecure somewhere, say so. If you're guessing about something, say that too.

WRITTEN:
[PASTE YOUR WRITTEN SAMPLES]

SPOKEN:
[PASTE YOUR TRANSCRIPT]

Prompt 2. Your rules and the never-list

Fill in the [BRACKETS], then paste it into Claude
Add two sections to the bottom of my voice doc.

MY RULES
Write my rules as "always" and "never" lines. Start with these, then add any you see in my samples:
- [A RULE ABOUT MONEY, e.g. "Give the price first. Never apologize for it."]
- [A RULE ABOUT CLIENTS, e.g. "Use their first name. Never 'Dear'."]
- [ANYTHING ELSE, e.g. "If you're missing a fact about my business, ask. Don't invent it."]

AI TELLS: NEVER WRITE THESE
List the patterns that make writing sound like AI, each with one before-and-after example rewritten in my voice. Include at least:
- Em dashes. Use a comma or a period instead.
- "It's not just X, it's Y" and "not only... but also"
- Lists of three when there are really one or two things
- Words like unlock, elevate, delve, dive into, journey, seamless, game-changer, leverage, empower, vibrant, crucial
- "I hope this finds you well," "don't hesitate to reach out," "just wanted to follow up"
- Emojis as bullet points or at the start of headings
- Captions that end in a wall of hashtags or "Drop a 🔥 if you agree"
- Every sentence the same length
- A neat inspirational line at the end
- Opening with "Great question!" or "Absolutely!"

Then check my own samples against this list. If I use one of these on purpose and it's really mine, tell me, and I'll decide whether to keep it.

Prompt 3. The VOICE CHECK shortcut (save it in your Project instructions)

Copy it as is, then paste it into Claude
VOICE CHECK
When I type VOICE CHECK and paste a draft (a caption, an email, a script, something another AI wrote):
1. List every line that breaks my voice doc or my AI-tells list, and say which rule it breaks.
2. Rewrite it in my voice. Keep my meaning and my facts. Don't add anything I didn't say.
3. If it's a caption: no em dashes, two hashtags max and only if they help people find me, no "link in bio" unless I ask.
4. If it's a script I'll read out loud: use HOW I TALK. Every paragraph is a complete thought. Keep my words, cut the filler.
5. Then reread your own rewrite and fix anything that still sounds like AI.

Prompt 4. The blind test

Fill in the [BRACKETS], then paste it into Claude
Using my voice doc, write three short messages I'd really send:
1. [A CLIENT MESSAGE YOU SEND OFTEN, e.g. "reminding a client to bring her numbers Thursday"]
2. [A CAPTION, e.g. "a post about a client who raised her price"]
3. [SOMETHING HARD, e.g. "telling a client her payment is two weeks late"]

No intro, no notes. Just the three messages, numbered.

What it looks like filled in

Primer Paso Coaching pasted 12 written samples and a 2-minute voice memo where she told a friend about a client. Part of the voice doc that came back:

Claude

HOW I WRITE: Short sentences, then one long one when you explain. Formality 3 of 10. You open with something you noticed about the person ("saw the photo Saturday"). You close with a question. "!!" only with clients you know well. HOW I TALK: Much longer than you write. You stack thoughts with "and" and "so," and you restart a sentence when you find a better word. For scripts: keep "even if they're ugly" and the restarts that land a joke; cut "you know what I mean" and "so basically." WORDS I REACH FOR: "Deal?", "even if they're ugly," "that's already a win." WORDS I NEVER USE: nothing corporate. No "journey," no "empower." You never say "investment" for a price; you say the number.

She marked one X: "I don't switch to English for prices. I say them in whatever language the client wrote in." Claude fixed it. The next day she ran VOICE CHECK on a caption another app had written for her:

You

VOICE CHECK
Unlock your pricing confidence ✨ It's not just about the numbers — it's about knowing your worth, owning your value, and showing up for your business. 💪 #pricing #smallbusiness #latinaowned #entrepreneur #mindset #worth

Claude wrote back:

Claude

Breaks your doc: "Unlock" (AI tells). The em dash (AI tells). "It's not just about X, it's about Y" (AI tells). Three slogans in a row and no facts (AI tells). "Knowing your worth" (you never talk in slogans). Six hashtags (caption rule). Rewrite: "Six years at $65. Today Carmen wrote $85 on my whiteboard and it took her 40 minutes. It's not her final price. It's the first one she dared to write down. What would you charge if nobody could argue? #fairpricing"

For the blind test, her friend read four messages and picked the wrong one as "the real one." Done.

Takeaway

What you walk away with: a one-page voice doc saved in your Project, your always and never rules, an AI-tells list cleaned up to match how you really write, and a VOICE CHECK shortcut for everything you post from now on. Every draft Claude writes for you starts from that page.

AI can't guess your voice. Hand it the written you and the spoken you, let it describe both, then correct it until it's right.

What's the phrase you say so often your friends tease you about it? That one goes under WORDS I REACH FOR.

The next step

The full version is "Sound Like You" in Learn AI, Build Your Business: 14 short days that add your banned list for money conversations, the correction loop, your second language, and testing your voice on the hardest email you've been avoiding.

New to Claude? Start Here in the free classroom. The free plan works.

Sources

  • My own voice setup: a voice doc built from my posts and transcribed voice memos, with a separate mode for reel scripts, and a final pass based on Wikipedia's "Signs of AI writing." Primer Paso Coaching is an illustrative example, not a real person.
  • Lessons "Your 10 messages," "Your voice, on paper" and "What you never say" (Sound Like You).
  • Claude Help Center: Use skills in Claude: skills on Free, Pro, Max, Team and Enterprise; upload your own from Customize > Skills; needs code execution. Checked Sept 29, 2026.
  • Claude: memory works everywhere, and you decide what's in it (Aug 25, 2026), checked Oct 2, 2026

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