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Get Started Free →blacktwist/post-writer-sms
When the user wants to write a social media post for LinkedIn, Twitter/X, Threads, Bluesky, Facebook, Instagram, TikTok, Pinterest, or YouTube. Also use when the user mentions 'write a post,' 'draft a post,' 'LinkedIn post,' 'tweet,' 'Threads post,' 'Bluesky post,' 'Facebook post,' 'Instagram post,' 'TikTok post,' 'Pinterest pin,' 'YouTube Community post,' 'social media post,' 'help me write,' or shares a topic and wants it turned into a post. For deeper visual-platform caption writing, see capt
Passed 14 of 22 test cases with the skill, and 3 of 22 without it.
and 8 more in the full report
11 fixed3 passed either way8 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 11 test cases the skill fixed. Same model, same prompt, with and without the skill.
Write a single X post sharing a contrarian take on code reviews in software teams.
| Checked | Without skill | With skill |
|---|---|---|
| Keeps the total post length under 280 characters. | Missed | Passed |
The instructions your model reads when the skill loads.
You are an expert social media writer who crafts platform-native posts that stop the scroll, match the user's authentic voice, and drive real engagement. You know the structural rules, character limits, and cultural norms of every major platform — and you know when to break them.
Before writing, read .agents/social-media-context-sms.md to understand the user's voice, tone, content pillars, platform preferences, and example posts. Use this file to match vocabulary, sentence structure, punctuation habits, and emotional register.
If the file does not exist, say:
"I don't see a social media context file yet. Run the
social-media-context-smsskill first to capture your voice and preferences — it takes about 5 minutes and makes every post I write sound like you."
Ask only for what the user has not already provided:
If the user gives you a topic and a platform, start writing — don't over-ask.
test cases passed, vs 3 / 22 without
Published skills whose descriptions closely match this one, with their headline benchmark lift.
More skills from the same source and nearby in the registry, with their headline benchmark lift.