Someone replied to an email last week saying it was one of the clearest I'd sent. I'd written maybe ten words of it. Claude wrote the rest. The thing that made it sound like me wasn't a clever prompt. It was a file I built once, from my own sent emails, that Claude now checks every time I ask it to draft something.
You don't need Claude Code or a developer to set this up. It's three things inside claude.ai: connect Gmail, let Claude read your own sent emails and write your style profile, then turn that into a Skill so it applies itself. Here's exactly how.
Why your emails still sound like a robot wrote them
Claude defaults to generic professional language because it has no idea how you actually write. Clear, correct, and completely un-you. The fix isn't a better prompt each time, it's giving Claude a permanent reference for your voice: your tone, the phrases you can't stand, your sentence rhythm. Once that reference exists and Claude checks it automatically, every draft starts from you instead of from a blank, corporate default.
Step 1: Connect Gmail (about a minute)
In Claude, go to Customize > Connectors (or click the + in any chat and choose Connectors). Find Gmail, connect it, and authorize it. This is available on every plan, including Free.
Worth knowing going in: Claude can read and search your mail and create drafts, but it can't send on your behalf. That's a deliberate limit, not a bug, and it means the last step is always you hitting send.
Step 2: Let Claude build your style profile from your real emails
Start a new chat and ask Claude to look at how you actually write, not how you think you write. Something like:
Search my Gmail Sent folder for the last 20-30 emails I've written. Read through them and write me a communication-style.md file that covers: my tone in different contexts, phrases and patterns I overuse or should cut (including the generic AI-sounding lines, like "I hope this finds you well" or "please don't hesitate to reach out"), my sentence rhythm, and one default line for when in doubt. Be specific, not vague.
This is my own recommended prompt, not an official Claude script, but it's a straightforward use of what the Gmail connector actually does: it can search and read your Sent mail on request. Claude will hand back a first draft. Read it properly. Cut anything that doesn't sound like you, and add the phrases you personally can't stand that it missed. This is the file that matters most, so don't rubber-stamp the first pass.
Four things worth double-checking are in it:
Tone. How you write in different contexts. "Internal messages: casual and direct. Client emails: professional but plain-spoken, never corporate."
What to avoid. The most important section. Every word and pattern that makes an email sound machine-written: em dashes, emojis, "circle back", "touch base", "moving forward", "I hope this finds you well". Name them specifically.
Sentence rhythm. Contractions or not? Short sentences or longer ones? "Contractions are good. Vary sentence length. Avoid strings of three-word fragments back to back."
Default. Your baseline instinct. "When in doubt: shorter, sharper, more concrete. Strip filler."
Step 3: Turn it into a Skill (this is the part that makes it stick)
A file sitting in a chat only helps that one conversation. A Skill is what makes Claude check your style automatically, every time, in any new chat.
- Make sure Code execution and file creation is turned on: Settings > Capabilities for your own account. (If you're on a Team or Enterprise plan, your workspace owner turns this on once for everyone, under organization Skills settings.)
- Ask Claude to save your finished style file as
SKILL.md, with a short header at the top: anameand adescription. The description matters more than anything else here, it's what Claude reads to decide when to use the skill, so make it specific and say plainly that this applies whenever you're drafting or rewriting an email. - Zip that file so it sits at the top level of the zip (Claude can talk you through this if you're not sure how).
- Go to Customize > Skills, hit the +, choose Create skill > Upload a skill, and upload the zip.
Step 4: Draft an email in your own voice
Open a new chat, paste in whatever you're replying to, and just say "draft a reply." Claude checks its available skills against your request, sees the description matches "drafting an email," and applies your voice rules without you asking twice.
It won't catch every single time. If a draft comes back sounding generic, name the skill directly: "use my email-voice skill for this." That forces it.
One more thing worth doing: ask Claude to drop the finished draft straight into your Gmail Drafts folder using the connector. It'll be sitting there waiting. Open Gmail, read it over, hit send yourself.
The honest ceiling
This whole setup lives in your Claude account. It's genuinely useful for you, and it took maybe ten minutes to build. But it's still one person's voice, in one person's settings. Nobody else on your team gets it unless they build their own, and every tool they use for outbound comms needs its own version of the same fix.
The next level is a voice standard that's built once and enforced automatically, everywhere, for everyone on the team, not something each person sets up for themselves. That's what we build into the AI operating systems at Whitehorse. If you want that for your business, an audit is where it starts.
Start here
Open Claude right now, connect Gmail, and ask it to pull your last 20 sent emails. That's the whole first step, and it takes about two minutes. You'll have a first draft of your style file before your coffee's cold.
Built by Alex Sidhu, Whitehorse AI.