instagram-caption-generator
Skill2 starsChanged 47 days agoMITView on GitHub
Write Instagram captions for photo posts, carousels and Reels with a strong first line, a clear CTA, a few specific hashtags and suggested alt text, ready to publish with the PostOnce Instagram MCP. Use when the user asks for an Instagram caption, caption ideas, a caption generator, or to write, rewrite or shorten a caption for a post or Reel.
In this repository6 other files it gives its agents.
The file
We split this skill into the rules it gives an agent
3 rules. About 0 are common, 2 are distinctive, and 1 is very specific to this project.
≈0
Common · estimate
Many files like this have a rule of this kind.
≈2
Distinctive · estimate
This author's own choices. Worth a look.
1
Very specific
Tied to their project's names, files or tools. Probably skip.
- Common
- Distinctive
- Very specific
- Very specific: line 11
Write one caption for one Instagram post, then hand it to the postonce skill if the user wants it published or scheduled.
- Distinctive: line 29
Don't open with "Happy Monday", "New post!", the brand name, or a string of emojis.
- Distinctive: line 35
Write like the account talks.
≈ “Common” is an estimate: at least 1 in 5 of the 350,495 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.
Files
Instagram caption generator
Write one caption for one Instagram post, then hand it to the postonce skill if the user wants it published or scheduled.
Before writing
Get or infer: the account (brand, creator, local business), the format (single photo, carousel or Reel), what the media shows, the one thing the viewer should feel or do, and any fact or detail that makes it specific. Look at the photos or video if you can. Never invent numbers, results, prices or quotes.
The first line
Instagram shows about one line of caption before "more", and less under a Reel. That line has to work on its own. Pick one pattern:
| Pattern | Example shape |
| Name the moment | "The 6am batch nobody sees." |
| Say the result | "Three ingredients. Ten minutes. No oven." |
| Contrarian | "You don't need a ring light to film Reels." |
| Point to the media | "Swipe to the last photo before you judge." (carousels) |
| Save-worthy promise | "The 5 settings I change on every new phone." |
Don't open with "Happy Monday", "New post!", the brand name, or a string of emojis. The caption's first line should add to the media, not describe it.
Body and CTA
- Short paragraphs, one or two sentences each, with line breaks.
- Match length to the job. A strong photo or Reel can take one or two lines. A carousel or tutorial can take a longer caption with the steps or context. The hard limit is 2,200 characters.
- Write like the account talks. Plain words, no "elevate", "unlock", "game-changer".
- End with one CTA that fits the post: save it, send it to someone, comment a specific answer, or tap the link in bio. One ask, not four.
- Links in captions aren't clickable on Instagram. Say "link in bio" if there's a link.
Hashtags
Use 3 to 5 specific hashtags that describe the post's topic and audience, placed at the end. Skip broad tags like #love or #instagood. Instagram's own guidance favors a few relevant tags over many. PostOnce removes any hashtags past 30. For a researched set, use the instagram-hashtag-generator skill.
Alt text
Write one short alt text line per image, usually one sentence: what's in the image, plus any text shown on it. The API doesn't set alt text, so tell the user to add it in the Instagram app (Edit post, then Edit alt text) once the post is live.
Output
Give the caption exactly as it will appear, then hashtags on their own line, then alt text per image. Offer two alternative first lines if the user wants options. Offer to publish or schedule it with the postonce skill; confirm the Instagram account and the time before calling create_post. Instagram needs at least one photo or video, so check media exists first.
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