| 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
- Caption — hook line + value + optional CTA, sized to the platform (IG/TikTok
short; LinkedIn longer; X terse). ✅ Check: fits platform length norms.
- Hashtag tiers — broad (reach), niche (relevance), branded (identity). Count
per platform norm (IG ~8–12; TikTok ~3–5; X ~1–3; LinkedIn ~3–5).
- Relevance + safety pass — drop spammy/banned/irrelevant tags; keep facts true.
- 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
Example
Input: "Webb image of the Carina Nebula", platform instagram → a caption + ~10
tiered hashtags, credit line included.
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
