Claude social media posts: how to write and design them well

For Claude social media work, treat Claude as a writer you brief once, not a slot machine you pull every morning. Set up a Project holding your voice, audience and banned words, ask for specific posts with the platform and format named, and connect a design tool over MCP so Claude can lay its words onto real designs. Done that way, Claude writes posts that sound like you and arrive at the right size, ready for a human edit.

Set up a Project with your house style

Claude's Projects let you store instructions and files that apply to every chat inside them. That is the single most useful thing you can do for social media, because the brief you would otherwise retype each time is always there. Upload a few of your best past posts, your brand guidelines if you have them, and write project instructions along these lines.

We are [brand], a [what you are] for [audience].

Voice: [three words, e.g. calm, precise, warm]. Short sentences. British spelling.
We never: use exclamation marks, say 'revolutionary', promise results, invent numbers.
We always: say one thing per post, end with one clear action.

Platforms we use: Instagram (portrait 1080x1350, Stories 1080x1920),
LinkedIn (1200x1200 or 1080x1350), X (1600x900).

When asked for a post, return: the words on the image (under 8 words),
a supporting line, the caption, alt text. Ask before inventing any fact.

If you want help writing the voice part, brand guidelines your AI assistant can follow walks through it. The aim is rules Claude can apply, not adjectives it has to guess at.

Prompts that get usable posts from Claude

With the house style in place, the prompt itself can be short, but it should still be specific. The difference shows most on the second draft: a specific prompt gives Claude something to correct against.

There are fifty more in AI prompts for social media, grouped by format.

From words to designs: connecting Claude over MCP

Writing is half a post. The other half is a design at the right size, with text that reads. Claude can do that half too when it is connected to a design tool through MCP, the Model Context Protocol, an open standard for giving assistants real tools. What MCP is explains it without jargon, and Claude's custom connectors are how you add one, where your plan allows.

Gradiently works inside Claude this way. With a scoped API key, created by a workspace owner or admin in Settings › API and agents, Claude can search Marks, read your workspace and brand kit, and create designs that open in the Studio as ordinary editable pages, without spending Gradiently credits. Each design wears a Mark rather than a stock gradient (once you claim one, only you can export with it), and the Mark moves its calmest region behind the words so they stay readable. The full walkthrough is designing with Claude through Gradiently.

1. 1

   Create a scoped key

   In Gradiently, open Settings › API and agents and create a key with only the permissions Claude needs. Name it after where it is used.

2. 2

   Add Gradiently as a connector

   Add the remote MCP server to Claude with the address shown in Settings. Technical details are in the developer docs.

3. 3

   Ask for designs, not descriptions

   “Make Monday's post as a LinkedIn portrait design and an Instagram Story in our brand.”

4. 4

   Review in the Studio

   Open each design, read every word, adjust anything and export the sizes you need.

A weekly routine that holds up

1. Monday, 15 minutes: ask Claude for the week's plan against your content pillars. Swap anything that feels off.
2. Monday, 30 minutes: have Claude draft every post and create the designs through your connector.
3. Monday, 15 minutes: read each design in the Studio. Fix facts, tighten one line in your own words, export.
4. Through the week: schedule as normal. Note which posts did well and paste that note into the Project.
5. Friday: ask Claude to compare what worked against your pillars and suggest next week's angles.

Where Claude needs a human

Claude is reliable at structure, variants and editing against rules. It cannot know what happened in your shop today, which customer story is worth telling or what your audience is tired of hearing. Keep those choices yours, and let Claude do the drafting, resizing and checking around them. That split is also the honest answer to whether your posts will start sounding generic: they will only if the ideas come from the model rather than from you. Brand consistency with AI covers the longer term.