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spec: TimelineTweet.prerollMetadata (nightly 2026-10-26) - #134
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Seen on a HomeTimeline video ad in the 2026-10-26 nightly and recorded on the sandbox: Preroll with dynamicPrerollType, prerollId (<media type>_<id>) and mediaInfo (advertiser, call to action, duration, publisherResults, videoVariants). 1,310 stored responses at match rate exactly 1.0, strict 130/130. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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The 2026-10-26 nightly first fell over the CI proxy (unreachable from the runner for a few minutes; a rerun got through) and then failed on
HomeTimeline: a video ad carriesitemContent.prerollMetadata, a pre-roll played before the post's video.Typed from a sandbox recording made this morning (
TimelineTweet.prerollMetadata→PrerollwithdynamicPrerollType,prerollId,mediaInfo: advertiser name and image, call to action, duration,publisherResults(aUserResults),videoVariantswith bitrate / content type / url).prerollIdis<media type>_<media id>, not numeric.Verification
errorsbeside complete data are logged as warnings).🤖 Generated with Claude Code