TikTok Direct Post post_info fields: title, is_aigc, duet, stitch

TikTok's Direct Post post_info object has one required field, privacy_level, and several optional ones that matter for AI video: is_aigc, title, the three disable flags and the two brand toggles. The table lists them as the vendor page reads today. The validator after it catches the mistakes that waste an upload, in particular a title counted in the wrong unit.

Field table

A validator that runs

Python's len() counts code points, not UTF-16 units, so an emoji outside the basic plane counts as two on TikTok's side. Encode to UTF-16 to count.

def utf16_len(text):
    return len(text.encode("utf-16-le")) // 2

def check(info, allowed_privacy):
    errs = []
    if info.get("privacy_level") not in allowed_privacy:
        errs.append("privacy_level not offered for this creator")
    if utf16_len(info.get("title", "")) > 2200:
        errs.append("title over 2200 UTF-16 units")
    if not isinstance(info.get("is_aigc", False), bool):
        errs.append("is_aigc must be a bool")
    return errs

info = {"privacy_level": "SELF_ONLY", "title": "Demo \U0001F3AC",
        "is_aigc": True, "disable_duet": True}
print(check(info, ["SELF_ONLY", "PUBLIC_TO_EVERYONE"]))

Where the video comes from

If the video is generated or edited with Sume, set is_aigc yourself: nothing in the trim, caption or filter endpoints writes TikTok metadata for you. To fit a length limit, video trim cuts a range for $0.02 per job. To add on-screen text, video captions burns styles such as tiktok-green for $0.20 per clip up to 60 seconds.

Limits

Allowed privacy_level values depend on the creator and come from the creator info query, so hard-coding the four names is wrong. In practice, query the creator first, cache the list for that session, and reject the post locally rather than discovering the mismatch after a multi-chunk upload has finished. This post does not describe audit status or how unaudited clients are treated; read the TikTok guidelines for that. For when AI labeling is expected, see Does TikTok allow AI-generated content.