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How to Write LinkedIn Posts for Agency Clients (That Actually Sound Like Them)

Why most AI LinkedIn posts sound like they were written by nobody

I spent six years running content ops for an agency that carried between 20 and 30 clients at any given time. Once ChatGPT got good enough that people started using it to draft LinkedIn posts, I watched almost every client's output start to sound the same. Not bad, exactly. Just flat. Confident sentences with no fingerprints on them.

Here's why that happens. A general-purpose AI tool has no information about how your client actually writes. Ask it to draft a LinkedIn post for a B2B SaaS founder and it defaults to the median voice of every LinkedIn post it's ever seen: "I'm excited to share," a tidy list, a bolded takeaway, a closing line asking what everyone thinks. That's not a flaw in the tool. It's the tool doing exactly what it's built to do when you give it no real information to work with — filling the gap with the safest, most broadly applicable version of the genre.

The result is a post that could have run under any of your 25 clients' names. Swap the headshot and nobody notices.

What you're actually looking for when you study how someone writes

Before I automated any of this, I did it by hand: reading through a client's last 20 or 30 published posts, or their blog archive, and taking notes. A few years of that taught me what actually matters.

Vocabulary is the first thing to track. Some clients say "customers," others say "folks" or "operators." Some default to "build," others to "ship." One of our clients, a fractional CFO, never once used the word "utilize" in eighteen months of posts. He always wrote "use." That's a real signal, not a coincidence.

Sentence length and rhythm come next. Some clients write in short, clipped fragments. Others write long sentences that wind through two or three clauses before landing the point. You can usually tell within five posts which kind of writer someone is.

Then there's the open and the close. Most people have an opening move they don't even know they repeat, always a number, or always a blunt claim stated flat with no lead-in. Closings vary just as much. Some end with a direct ask, while others just stop on a flat statement and let it sit.

Last, pay attention to what they never say. This gets skipped constantly, but it's often the most useful data point. If a client has never used an emoji or never written the word "synergy," that absence tells you as much as anything they've actually written.

A framework you can use without any tool at all

If you want to do this by hand for your own clients, here's roughly what to build for each one: a short list of words they reach for and a short list they'd never touch, their typical sentence length, how they usually open a post, how they usually close it, and the topics they gravitate to without being asked. Put it on a single page per client. Read that page before you draft anything for them. It will get you most of the way to sounding like the person, no software required, just discipline about doing it every time instead of once and forgetting.

How ContentKit handles this so you're not redoing it every time

This is the part we automate, because doing that page-per-client exercise for 25 clients, every time you sit down to write, is the real bottleneck in agency content ops. It's not the writing itself that eats the hours. It's re-explaining the same client to whatever tool you're using.

ContentKit reads a client's existing published content once and extracts the pattern described above: the vocabulary, the rhythm, the opens and closes, the recurring angles. It stores that against the client and reuses it. From then on, pasting a new blog post produces linkedin content for clients that already sounds like them, alongside a founder-voice version, an X thread, a newsletter, and an outreach snippet, without anyone re-explaining the client from scratch.

It's not a replacement for knowing your clients, and it won't catch a voice shift the week a client rebrands. What it does is remove the part of the job that was never the interesting part anyway: retyping the same brief for the fifteenth client of the week.

The agencies that keep clients the longest aren't the ones who land one great post. They're the ones whose clients stop being able to tell which post their agency wrote and which one they'd have written themselves, sixty posts and six months in.