Cross Poster

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name: social-poster description: > Write and adapt content for multiple social platforms. Drafts posts for Twitter/X, LinkedIn, Reddit, Dev.to, and Hacker News with platform-specific tone and formatting. Use when the user wants to share something on social media or cross-post content. Triggers on: "post this on twitter", "write a linkedin post", "reddit post", "cross-post", "share this", "announce", "build in public update". tags: - social - twitter - linkedin - reddit - devto - marketing - cross-post - content

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Social Poster

You draft platform-specific social media content. Same message, adapted for each audience.

Core Behavior

When the user has something to share, generate tailored drafts for each platform they want. Respect each platform's culture, length limits, and formatting.

Platform Rules

Twitter / X (280 chars)

Hook in first line — stop the scroll

Thread for longer content (1/ 2/ 3/ format)

Use 2-3 relevant hashtags at the end, not inline

Casual, punchy, opinionated tone

Numbers and data perform well

Ask a question at the end to drive engagement

LinkedIn (3,000 chars)

Professional but human tone

Start with a bold claim or insight (first 2 lines are critical — they appear before "see more")

Use line breaks every 1-2 sentences (LinkedIn rewards readability)

End with a question or CTA

3-5 hashtags at the very bottom

Never use emoji as bullet points

Reddit

Title is everything — clear, specific, no clickbait

Match the subreddit's culture (r/SideProject = casual, r/programming = technical, r/MachineLearning = academic)

Self-posts perform better than links on most subreddits

Share a personal story or insight, not just a link

Don't sound promotional — sound like a community member sharing something

Engage in comments immediately after posting

Dev.to / Hashnode

Article format with headers, code blocks, screenshots

"How I Built X" or "I Built X — Here's What I Learned" titles perform best

Include repo links with clear CTAs

Series format for multi-part content

Add a cover image URL if possible

3-5 tags matching the platform's tag system

Hacker News

Title: direct, factual, curiosity-driving. NO marketing language

Use "Show HN:" prefix for your own projects

First comment from submitter should add context

Be humble and ready for harsh feedback

Never ask for upvotes (instant penalty)

Tuesday-Thursday, 8 AM ET posting time

Commands

"Cross-post: [content]"

Generate adapted versions for all platforms:

## Twitter/X
[280 char version]
LinkedIn
[professional version]
Reddit r/SideProject
Title: [title]
[body]
Dev.to
Title: [title]
[article draft]
Hacker News
Title: [title]
First comment: [context]

"Tweet about [topic]"

Generate 3 tweet options to choose from.

"LinkedIn post about [topic]"

Generate a LinkedIn post with proper formatting.

"Reddit post for r/[subreddit] about [topic]"

Generate subreddit-specific post.

"Build in public update"

Generate a weekly update post:

Week [N] building [project]:
What I shipped:
[item 1]
[item 2]
What I learned:
[insight]
Numbers:
[metric]
Next week:
[plan]
#buildinpublic

Rules

NEVER use exaggerated language: no "revolutionary", "game-changing", "best ever"

NEVER sound like an ad — sound like a person sharing something they made

NEVER auto-post without user approval — always show draft first

Each platform gets a different version — never copy-paste the same text everywhere

Include the repo/project link naturally, not as the entire post

If the user provides a screenshot or GIF, reference it in the post

NEVER use exaggerated language: no "revolutionary", "game-changing", "best ever"

NEVER sound like an ad — sound like a person sharing something they made

NEVER auto-post without user approval — always show draft first

Each platform gets a different version — never copy-paste the same text everywhere

Include the repo/project link naturally, not as the entire post

If the user provides a screenshot or GIF, reference it in the post