Crosspost Skill for Claude

Crosspost

Distribute content across multiple social platforms with platform-native adaptation.

When to Activate

• User wants to post content to multiple platforms
• Publishing announcements, launches, or updates across social media
• Repurposing a post from one platform to others
• User says "crosspost", "post everywhere", "share on all platforms", or "distribute this"

Core Rules

• Never post identical content cross-platform. Each platform gets a native adaptation.
• Primary platform first. Post to the main platform, then adapt for others.
• Respect platform conventions. Length limits, formatting, link handling all differ.
• One idea per post. If the source content has multiple ideas, split across posts.
• Attribution matters. If crossposting someone else's content, credit the source.

Platform Specifications

| Platform | Max Length | Link Handling | Hashtags | Media |

|----------|-----------|---------------|----------|-------|

| X | 280 chars (4000 for Premium) | Counted in length | Minimal (1-2 max) | Images, video, GIFs |

| LinkedIn | 3000 chars | Not counted in length | 3-5 relevant | Images, video, docs, carousels |

| Threads | 500 chars | Separate link attachment | None typical | Images, video |

| Bluesky | 300 chars | Via facets (rich text) | None (use feeds) | Images |

Workflow

Step 1: Create Source Content

Start with the core idea. Use content-engine skill for high-quality drafts:

• Identify the single core message
• Determine the primary platform (where the audience is biggest)
• Draft the primary platform version first

Step 2: Identify Target Platforms

Ask the user or determine from context:

• Which platforms to target
• Priority order (primary gets the best version)
• Any platform-specific requirements (e.g., LinkedIn needs professional tone)

Step 3: Adapt Per Platform

For each target platform, transform the content:

X adaptation:

• Open with a hook, not a summary
• Cut to the core insight fast
• Keep links out of main body when possible
• Use thread format for longer content

LinkedIn adaptation:

• Strong first line (visible before "see more")
• Short paragraphs with line breaks
• Frame around lessons, results, or professional takeaways
• More explicit context than X (LinkedIn audience needs framing)

Threads adaptation:

• Conversational, casual tone
• Shorter than LinkedIn, less compressed than X
• Visual-first if possible

Bluesky adaptation:

• Direct and concise (300 char limit)
• Community-oriented tone
• Use feeds/lists for topic targeting instead of hashtags

Step 4: Post Primary Platform

Post to the primary platform first:

• Use x-api skill for X
• Use platform-specific APIs or tools for others
• Capture the post URL for cross-referencing

Step 5: Post to Secondary Platforms

Post adapted versions to remaining platforms:

• Stagger timing (not all at once — 30-60 min gaps)
• Include cross-platform references where appropriate ("longer thread on X" etc.)

Content Adaptation Examples

Source: Product Launch

X version:

We just shipped [feature].

[One specific thing it does that's impressive]

[Link]

LinkedIn version:

Excited to share: we just launched [feature] at [Company].

Here's why it matters:

[2-3 short paragraphs with context]

[Takeaway for the audience]

[Link]

Threads version:

just shipped something cool — [feature]

[casual explanation of what it does]

link in bio

Source: Technical Insight

X version:

TIL: [specific technical insight]

[Why it matters in one sentence]

LinkedIn version:

A pattern I've been using that's made a real difference:

[Technical insight with professional framing]

[How it applies to teams/orgs]

#relevantHashtag

API Integration

Batch Crossposting Service (Example Pattern)

If using a crossposting service (e.g., Postbridge, Buffer, or a custom API), the pattern looks like:

import os
import requests

resp = requests.post(
    "https://your-crosspost-service.example/api/posts",
    headers={"Authorization": f"Bearer {os.environ['POSTBRIDGE_API_KEY']}"},
    json={
        "platforms": ["twitter", "linkedin", "threads"],
        "content": {
            "twitter": {"text": x_version},
            "linkedin": {"text": linkedin_version},
            "threads": {"text": threads_version}
        }
    },
    timeout=30,
)
resp.raise_for_status()

Manual Posting

Without Postbridge, post to each platform using its native API:

• X: Use x-api skill patterns
• LinkedIn: LinkedIn API v2 with OAuth 2.0
• Threads: Threads API (Meta)
• Bluesky: AT Protocol API

Quality Gate

Before posting:

• [ ] Each platform version reads naturally for that platform
• [ ] No identical content across platforms
• [ ] Length limits respected
• [ ] Links work and are placed appropriately
• [ ] Tone matches platform conventions
• [ ] Media is sized correctly for each platform

Related Skills

• content-engine — Generate platform-native content
• x-api — X/Twitter API integration

原文

• 英語版の原文

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