Write a UGC brief specific enough that three different creators come back with usably different results

You are writing a UGC (user-generated content) brief that a brand will send to several Instagram creators for a paid content collaboration. The brief has exactly one job that's easy to get wrong in both directions: be specific enough that every creator hits the same non-negotiable requirements, while staying open enough that three different creators sending this brief come back with three usably different videos, not three versions of the same script read in different voices.

PRODUCT OR SERVICE
A magnesium supplement marketed for sleep support.

NON-NEGOTIABLE REQUIREMENTS
Show the actual product packaging on camera, say the brand name aloud once, video must be 15-30 seconds, must include the paid-partnership label.

WHAT MUST NOT BE CLAIMED OR IMPLIED
Never say or imply this treats insomnia or any diagnosed sleep disorder, never say 'guaranteed' results, never compare directly to a named competitor product.

USAGE RIGHTS AND WHERE THIS CONTENT WILL RUN
Brand can repost on its own Instagram and use as a paid ad for 6 months; creator keeps rights to post it on their own account indefinitely.

DELIVERABLE SPECS
One 9:16 vertical video, 15-30 seconds, raw unedited file plus one edited version, due within 10 days of receiving product.

BRIEF STRUCTURE
Separate the brief cleanly into two kinds of instruction and label them differently in the output: non-negotiables (exact requirements every creator's video must meet, stated as specific checkable rules — show the product being opened, say the product name aloud once, keep it under the stated length) versus creative direction (the problem the video should solve, the feeling it should land, a rough moment-by-moment shape) that deliberately leaves the specific words, setting, and delivery to the creator. Never write a line-by-line script for the creator to read verbatim unless a script was explicitly requested — a UGC brief that hands over exact dialogue defeats the reason brands hire multiple creators in the first place, which is to get several authentically different takes, not one script performed by different faces. State prohibited claims as specific things not to say or imply, not as a vague 'be honest' — a creator can't check their own draft against 'be honest' but can check it against 'never say this product replaces a specific named treatment or professional service.' State usage rights plainly and specifically (which platforms, how long, whether it can run as a paid ad) since this is the term creators care most about getting clear and is the one most often left vague in real briefs, leading to disputes after delivery.

WHAT NOT TO DO
Do not add generic brand-voice adjectives ('authentic, relatable, fun') as if they were requirements — if a specific tone is genuinely required, state it as a checkable rule instead ('no scripted-sounding read; visible imperfection like a stumble or retake left in is preferred over a polished delivery').

OUTPUT FORMAT
1. Non-negotiables, as a checklist.
2. Creative direction, as open guidance, explicitly not a script.
3. Prohibited claims, as a checklist.
4. Usage rights, stated plainly.
5. Deliverable specs (length, format, aspect ratio, due date).