caption-and-hashtag

name	caption-and-hashtag
description	Write a platform-tuned caption plus a researched, non-spammy hashtag set for a post. Use when finishing a social post, asked for 'caption and hashtags', or optimizing reach for Instagram/TikTok/X/LinkedIn.
version	0.1.0
domain	media
tags	["caption","hashtags","social","instagram","reach"]

Caption & Hashtag

A post's subject → a platform-tuned caption + a tiered hashtag set.

Purpose

Captions and hashtags are where reach is won or wasted. This skill writes a caption that fits the platform's voice and produces a tiered hashtag set (broad / niche / branded) that's relevant rather than spammy — calibrated to the platform's norms.

When it fires

• Keyword triggers: caption, hashtags, caption and hashtags, tags for post
• File triggers: posts/**
• Command triggers: /caption-and-hashtag

Inputs

Input	Required	Notes
subject	yes	What the post is about (+ any link/credit).
platform	yes	instagram, tiktok, x, linkedin.
voice	no	starlight (default), arcanea, frankx.

Workflow

1. Caption — hook line + value + optional CTA, sized to the platform (IG/TikTok short; LinkedIn longer; X terse). ✅ Check: fits platform length norms.
2. Hashtag tiers — broad (reach), niche (relevance), branded (identity). Count per platform norm (IG ~8–12; TikTok ~3–5; X ~1–3; LinkedIn ~3–5).
3. Relevance + safety pass — drop spammy/banned/irrelevant tags; keep facts true.
4. Carry credit — include any required image credit.

Output contract

{
  "caption": "string",
  "hashtags": { "broad": ["string"], "niche": ["string"], "branded": ["string"] },
  "platform": "string"
}

Tools & MCP

• Tools: Read, optional WebSearch for trending tags. MCP: none required.

Quality bar

• Hashtag count matches the platform norm; no spam/banned tags.
• Caption length and tone fit the platform.
• Claims true; credit carried if needed.

Example

Input: "Webb image of the Carina Nebula", platform instagram → a caption + ~10 tiered hashtags, credit line included.

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Built on SIP — Starlight Intelligence Protocol Substrate: starlightintelligence.org/protocol v1.1.0 Layers used: [file-contract, attestation, sovereignty] Vertical: starlight-agent-skills · portable capability layer