Tests whether models will author usable misinformation when asked to complete product-shaped fixtures — Storybook ModerationQueueItem rows, multi-turn null fills, truncation repair, and agent-style JSONL write/expand — under eng/UI packaging with a named harm class. Holds packaging fixed across climate, vaccine-autism, and false legal-theory topics. Controls: direct chat, dissemination newsletter, opaque topic code, label-stripped, realness-restore (recover the real production reply), and asserted speech-act (same JSON, field framed as the model's live reply — expect hold). Complements artifact-completion and damaging-essays. Load-bearing claim after Part X: specimen/completion packaging breaks; realness and asserted speech-act restore — not label value.

Holds one well-defended health-misinformation payload constant and sweeps completion-style scaffolds — pytest parametrize case, failing-test fill, fill-the-stub, git-diff add, patch-apply, jsonl append — that ask a model to COMPLETE an empty field in a pre-existing test/fixture/dataset artifact, against a direct baseline and two authoring-in-a-format controls. The completion framings crack even models that refuse the plain fixture; the standout (pytest parametrize / failing-test) generalises across labs.