How to use the Crosspost agent skill: adapt one post for X, LinkedIn, Threads and Bluesky

What the crosspost skill makes the agent do

Crosspost tells the agent not to paste identical text across social networks. Instead, it starts from the strongest source version (an original post, article, launch note, thread, memo or changelog) and adapts it to each platform's constraints.

The skill's rules keep each version in the author's voice and avoid filler. The agent is told not to invent a call to action, question or moral the source did not earn, and to delete stock phrases such as "Excited to share" or "What do you think?".

• X: compressed, leads with the sharpest claim or artifact, uses a thread only when one post would collapse the argument, no hashtags.
• LinkedIn: adds only the context outsiders need, no fake founder reflection, no closing question by default.
• Threads: readable and direct, not fake casual creator copy, not a shortened LinkedIn post.
• Bluesky: concise, keeps the author's cadence, no hashtags or feed-gaming language.

Install the crosspost skill

Download the crosspost ZIP from this page and unzip it. For a personal install, place the folder in ~/.claude/skills/. To limit it to one project, place it in that project's .claude/skills/ folder.

If you use the Claude apps, you can instead upload the skill under Settings → Capabilities → Skills.

• Personal install: ~/.claude/skills/crosspost
• Project install: .claude/skills/crosspost inside your project

Trigger the skill with a natural request

You do not need a special command. The skill's description says it applies when you want to distribute content across social platforms. The SKILL.md also lists phrases that activate it, including "crosspost", "post this everywhere" and "adapt this for X and LinkedIn".

Give the agent the source text and name the platforms you want. The more specific the request, the more useful the variants will be.

• "Crosspost this launch note for X, LinkedIn and Bluesky."
• "Adapt this essay for X and LinkedIn."
• "Post this everywhere: we just shipped version 2 of our tool."

What the agent returns

The skill defines a fixed output format. You receive the primary platform version, an adapted variant for each requested platform, a short note explaining what changed and why, and any publishing step you still need to handle.

Before delivering, the skill's quality gate checks that each version reads like the same author under different constraints, that no platform copy feels padded, and that no text is duplicated verbatim across platforms.

• Primary platform version
• Adapted variants per requested platform
• Short note on changes
• Remaining publishing constraints

Requirements and safety notes

The skill references two companion skills: brand-voice, which captures a reusable voice profile from your source material, and content-engine, which shapes source content. The brand-voice and content-engine skills should be available for the full voice-capture workflow. The x-api skill is referenced for X publishing workflows, and X API credentials would only matter if you want the agent to publish directly to X. The SKILL.md itself does not specify those credentials.

The skill does not run scripts and does not use the network, according to its listing. It writes copy only. It does not publish, schedule or post for you, so you copy the approved versions into each platform yourself unless you have separately set up publishing.

The skill applies style rules, not fact or compliance checks. Review claims yourself, and have legal or medical content checked before it goes out.

• Companion skills: brand-voice and content-engine
• Optional: x-api skill and X API credentials, only for direct X publishing
• Runs scripts: no
• Uses network: no
• Does not verify facts or compliance

Tips for better results

Start with the strongest version of your idea. The skill adapts a source; it does not rescue a weak one. If the source still needs voice work, the skill's workflow sends you to content-engine first.

Keep one idea per post. The skill's rules say each post should still be about one thing, so split a broad update into separate angles if needed. Only add cross-platform references when they help the reader.

• Give a clear source and the exact platforms you want.
• Run brand-voice once per session so the voice profile is reused.
• Expect the default posting order to be the strongest native version first, then secondary platforms.