Key takeaways
- On TikTok, the spoken or on-screen hook in the first 1-3 seconds matters more than the written caption below the video.
- AI-drafted TikTok captions read best short, lowercase, and specific — polished marketing copy underperforms here.
- Write the hook after the video is filmed or scripted, not before — it needs to match what actually happens on screen.
- Batch-write captions for a week of Shorts and schedule the whole set — SkedCast imports up to 2,500 posts per upload on Agency.
AI TikTok captions and scripts: why the hook matters more than the caption on TikTok
TikTok’s retention curve drops fastest in the first three seconds, so the spoken or on-screen text hook at the start of the video does more work than the written caption underneath it — most viewers decide whether to keep watching before they ever read the caption.
That means the AI’s most useful job for TikTok is drafting hook options for the video itself (a script line, a text overlay, a voiceover), not just the caption field.
Drafting hooks that match the video
Give the AI the actual content of the video, then ask for hook formats that fit it — not a generic "write a hook" prompt.
- Describe what happens in the first 3 seconds of the clip so the hook matches the visual
- Ask for hook formats proven on TikTok: a direct question, a bold claim, a "wait for it," or a pattern interrupt
- Generate 3-5 options and read them out loud — a hook that reads fine on screen can sound stiff spoken
- Pick the one that creates the most tension or curiosity gap for someone scrolling past
Keeping the written caption casual
The caption field below a TikTok is closer to a text message than ad copy. AI tools default to a more formal, complete-sentence style unless told otherwise, which reads as inauthentic on this platform.
- Ask explicitly for lowercase, short-sentence style if that matches your brand voice
- Keep it to one line plus 3-5 relevant hashtags, not a paragraph
- Cut anything that sounds like a tagline — TikTok captions work best as an aside, not a pitch
Scaling a cadence of 3-4 videos a week
A consistent TikTok cadence usually beats occasional high-effort posts. Script and caption a batch of videos in one sitting using the hook workflow above, film them in a batch, then schedule the captions against your uploads so publishing does not depend on remembering to post each day.
FAQ
- Does the TikTok caption matter if the video hook is strong?
- It still matters for search and context — TikTok increasingly surfaces videos by caption keywords the way a search engine would — but it will not save a video that loses viewers in the first three seconds. Fix the video hook first.
- Should TikTok hooks be written before or after filming?
- Draft a rough hook idea before filming to guide the shot, then finalize the exact wording after, once you can see and hear how the first three seconds actually play.
- How many hashtags should a TikTok caption have?
- Three to five relevant hashtags is a reasonable range. Stuffing a caption with a dozen broad hashtags does not reliably improve reach and can make the caption read as spam.