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MISSION
Build an AI ghostwriter that writes in your voice
Your calls hold hours of you explaining your work in your own words. This mission turns them into a voice guide that ChatGPT or Claude follows every time it drafts for you.
Mission type
Content Generation
Best for
Marketing
Sales
Founder/Solo-operator
Output
A reusable voice guide for posts, emails and messages
System used
Fathom
What it does
This mission builds an AI ghostwriter from your own meetings. It connects Fathom to ChatGPT or Claude, pulls only your side of past conversations, and studies how you talk: how long your sentences run, the phrases you reach for, how you open a point and how you close one. It writes that up as a voice guide and saves it as a skill, so every draft after that starts in your voice instead of generic AI copy.
Tone shifts with the audience, so the guide does too. It builds a separate profile for clients, for your team and for public posts.
Who it's for
Founders, marketers and sellers who write a lot under their own name and keep rewriting AI drafts that don't sound like them. If you spend most of the day on calls, you already have the best training material there is: hours of yourself explaining your work, unedited.
The flight plan
Run this once to build the guide, then refresh it every quarter or whenever your drafts start to drift.
- Connect Fathom to ChatGPT or Claude.
- Run the starter prompt below. It picks a mix of recent calls, reads the full transcripts and keeps only your lines.
- Read the guide it returns. Cut anything that doesn't sound like you and add any phrases it missed.
- Save the guide as a Claude skill or as instructions in a ChatGPT project.
- Ask for drafts by name and audience: "Write a LinkedIn post about our Q3 launch, public voice."
RULES
Use only your own lines. Other people's words pull the voice off course.
Read full transcripts, not summaries. Summaries are rewritten and lose your phrasing.
Split the guide by audience. The way you talk to a client isn't the way you talk to your team.
Back every pattern with two or three things you actually said.
List what you never say: the words, openers and habits that make a draft sound off.
What good looks like
A good voice guide reads like the notes a ghostwriter would take after shadowing you for a week: specific habits, each backed by your own lines, plus a clear list of what to avoid. A mediocre one describes a personality that could fit half of LinkedIn.
GOOD
"Leads with the takeaway, then explains why. Uses short sentences to make a point and longer ones to tell a story. Introduces results with 'here's what we saw.' Avoids 'leverage' and 'circle back.' Each habit is backed by two quotes from real calls."
MEDIOCRE
"Tone: friendly, professional and concise. Uses a conversational style."
STARTER PROMPT
⧉ CopyUse Fathom to find my 15 most recent meetings, mixing client calls and internal meetings. Pull the full transcripts, not the summaries, and use only the lines I said.
From those lines, build a voice guide another writer could follow to draft in my voice. Cover how I open and close a point, my typical sentence length and rhythm, the words and phrases I use often, how I explain an idea, give feedback and push back, and the words and habits I never use.
Back each pattern with 2–3 real quotes. Then split the guide into three audiences: clients, my team and public posts. Format the result as instructions I can save as a skill.
FAQs
Questions? We’ve got you covered.
How do I get AI to write in my voice?
Give it real examples of how you talk, then save what it learns as standing instructions. Connect Fathom to ChatGPT or Claude, have it read your side of recent meeting transcripts, and ask it to write a voice guide with quotes for each pattern. Save the guide as a Claude skill or ChatGPT project instructions so every new draft starts from it.
Can I use AI as my ghostwriter?
Yes, for first drafts. AI writes closest to your voice when it works from a guide built on your own words rather than a one-line tone description. Treat its output as a draft you edit, and tighten the guide whenever you catch a phrase you'd never say.
Which Fathom plan do I need to run this skill in ChatGPT or Claude?
Any Fathom plan, including Free. The skill reads your calls through Fathom's MCP integration with ChatGPT and Claude, which is on every plan.
Why use call transcripts instead of writing samples?
Transcripts show how you explain things before anyone edits them. Published writing has often been polished by an editor, a teammate or another AI tool, so it teaches the model someone else's choices. Your calls also cover more situations, from pitching to pushing back, which gives the guide more range.
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