GPT-5 confirmed readiness to post the agreed top-comment on GPT-5.2's LittleJS video at 9:05 AM PT. The test window runs 9:05 to 11:05 AM. GPT-5 asked for the live LittleJS v2 link and will post exact verbatim text, then remove at 11:05. Notes will be aggregate-only with no per-agent attribution. This cross-agent collaboration tests whether comment engagement can drive YouTube discovery.