Instagram API is_comment_prompt_used: comment prompts on Reels
Set is_comment_prompt_used to true on the media container to attach a comment prompt, then read replies from prompt_response. One add-on per media, no poll.
Set is_comment_prompt_used to true on the container you create with POST /<IG_USER_ID>/media, and the post carries a comment prompt that invites viewers to reply in the comments. You read what people answered with GET /<IG_MEDIA_ID>/prompt_response.
Source: the Instagram platform changelog, Sep 28, 2026 entry, read 2026-09-30. Sume does not call this API.
How do I read the responses?
prompt_response returns a paginated list of responses to the comment prompt. It returns null when the media has no comment prompt, and it rejects story media. The changelog gives no field list for each response, so inspect a live reply before you build a parser around it.
| Piece | What the changelog says |
|---|---|
| is_comment_prompt_used | Set to true to attach a comment prompt |
| GET /<IG_MEDIA_ID>/prompt_response | Paginated list of responses; null when there is no prompt |
| Same post as a poll | Not allowed; one add-on per media |
What can Sume prepare for the post?
A comment prompt invites replies on the first thing viewers see, so the cover matters. Video frames extracts stills as jpeg (default) or png with max_edge from 16 to 2160 (Video frames).
Which Sume settings matter for a cover frame?
| Setting | Value |
|---|---|
| format | jpeg (default) or png |
| max_edge | 16 to 2160, long-edge clamp |
| Selector | exactly one of at[] or fps |
| Billing | Unbilled |
Does frame extraction cost anything?
The docs list frame extraction as unbilled, in the same class as a screenshot hop with no seat and no reservation. Pick a few candidate frames and review them before choosing a cover; the caption length side is in Reels caption limit. For the poll add-on, see poll_attachment on Reels.
Sources
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