Social Media Caption Pack for Claude

One post idea in, a platform-ready set out: Instagram, LinkedIn, X and a Threads/short variant, each written for how that platform is read, with hashtags that fit the niche.

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Tested on:

Claude

ChatGPT

Fill in the variables

What the post is about *

Brand or creator voice *

Audience *

What you want people to do *

Visual that goes with it *

Details that must be included *

Prompt

<role>
You are a social media copywriter who manages accounts across platforms and writes each caption for how that platform is actually read: LinkedIn is skimmed in the feed with a "see more" cut, Instagram is read after the image, X is read in full in one glance.
</role>

<context>
What the post is about (the idea, result, announcement or story): {{post_idea}}
Brand or creator voice: {{voice}}
Audience: {{audience}}
What I want people to do: {{action}}
Visual that goes with it: {{visual}}
Details that must be included (names, dates, numbers, links): {{must_include}}
</context>

<constraints>
- Instagram: 80–150 words, first line works as a standalone hook, line breaks between thoughts, emojis only if the voice allows them (max 3), 8 hashtags at the end mixing niche (under 100k posts) and medium tags. No "link in bio" unless the action needs it.
- LinkedIn: 120–200 words, first 140 characters must carry the hook because the feed truncates there; short paragraphs, one blank line between them, no hashtags beyond 3, no "I'm humbled".
- X: under 240 characters, one idea, no hashtags, no thread.
- Threads/short: under 300 characters, conversational, a question or an opinion that invites replies.
- Same facts in all four. Nothing invented; use only the details given.
- No "excited to announce", "game-changer", "thrilled", "journey".
</constraints>

<goals>
- Each caption reads native to its platform rather than cross-posted.
- The must-include details appear accurately in every version.
- The hook is specific to the idea, not a generic opener.
</goals>

<instructions>
1. Write the four captions, each under a platform heading.
2. For Instagram and LinkedIn, mark where the "see more" cut falls with [cut] so I can check the hook stands alone.
3. End with one alt-text line for the visual (under 125 characters, descriptive, no "image of").
</instructions>

<output_format>
Four headed sections, then "Alt text:". Nothing else.
</output_format>

Example input

Post idea: We compared 12 AI background removers on 300 real product photos. The surprise: the two cheapest tools beat three of the expensive ones on edge quality, and the best tool overall costs $9 a month.
Voice: plain, specific, a little dry
Audience: small e-commerce sellers and marketers
Action: read the full comparison
Visual: a grid of the same mug cut out by 12 tools, with the best and worst circled
Must include: 12 tools, 300 photos, the winner costs $9/month, link: aitoolstime.com/category/image-editing/ai-background-remover

Example output generated with Claude Sonnet 4.6 from the example input above

INSTAGRAM Same mug, 12 AI background removers, 300 real product photos. [cut] The expensive ones did not win. Two of the cheapest tools beat three of the premium ones on edge quality, the thing that actually makes a listing look professional. The best tool overall is $9 a month. What we checked: hair and fur edges, reflective surfaces, transparent products, and whether a batch of 100 came back consistent. The full comparison with every score is on our site, link in bio. #productphotography #ecommercetips #backgroundremover #shopifysellers #etsyseller #aitools #smallbusinessowner #productphotos LINKEDIN We ran 300 real product photos through 12 AI background removers. The $9 tool won. [cut] Not the most expensive. Not the one with the biggest marketing budget. We scored every tool on the cases that break them: fur and hair edges, chrome reflections, glass, and batch consistency across 100 images. Two of the cheapest tools outperformed three premium ones on edge quality. For a small shop, that difference is a listing that looks like a studio shot versus one that looks cut out with scissors. The full table with scores per category is here: aitoolstime.com/category/image-editing/ai-background-remover If you sell physical products, which tool are you using now, and has it handled reflective items for you? #ecommerce #productphotography #aitools X 12 AI background removers, 300 real product photos, scored on fur, chrome, glass and batch consistency. The winner costs $9/month. Two of the cheapest beat three of the expensive ones. Full table: aitoolstime.com/category/image-editing/ai-background-remover THREADS Tested 12 AI background removers on 300 product photos. The $9 one won and two budget tools beat three premium ones on edges. Which one are you paying for, and has it ever got a chrome kettle right? Alt text: Grid of twelve cutouts of the same ceramic mug, best result circled green, worst circled red.

Why this works & how to customize

Why it works: most "write captions for all platforms" prompts produce one caption pasted four times. The constraints encode how each feed truncates and how each audience reads, and the [cut] marker lets you verify the hook survives the fold. Requiring identical facts in every version prevents the drift that happens when the model "improves" a number on the third rewrite.

How to customize: drop a platform by deleting its constraint line. For carousels, add "Instagram: first line references slide 1" to the context. If your voice allows emojis, say "up to 3 emojis" in the voice field; otherwise the model stays plain. Replace the hashtag rule with your own tested set once you have one, and ask the model to keep it fixed.

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