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Title: improvement(mothership): stable thinking indicator and jump-free streaming scroll by TheodoreSpeaks · Pull Request #5828 · simstudioai/sim · GitHub

Open Graph Title: improvement(mothership): stable thinking indicator and jump-free streaming scroll by TheodoreSpeaks · Pull Request #5828 · simstudioai/sim

X Title: improvement(mothership): stable thinking indicator and jump-free streaming scroll by TheodoreSpeaks · Pull Request #5828 · simstudioai/sim

Description: Summary Rework the thinking indicator into a single fixed-height slot on the last turn — shimmer swaps with arriving output via opacity only, so it never shifts the transcript (previously 4 mount/unmount sites caused up/down jumps) Contextual labels derived from the stream (Thinking/Dispatching/Returning); dispatch yields to the agent lane's own shimmer once open Fix auto-scroll jerk: followToBottom spawned a new chase loop per animationstart (up to 20 concurrent writers snapping the scroll) — now folded into createSmoothBottomChase via a deadline-extending kickUntil Prevent transcript drops from transient markdown re-parse shrinks: sizer min-height floored at the scrolled-to extent while streaming Type of Change Improvement Testing Verified with in-browser scroll instrumentation (0 stacked scroll writers, 0 downward transcript moves during streaming, 0px phantom space at settle); vitest 107/107 in the touched tree; lint + strict boundary validation pass Checklist Code follows project style guidelines Self-reviewed my changes Tests added/updated and passing No new warnings introduced I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

Open Graph Description: Summary Rework the thinking indicator into a single fixed-height slot on the last turn — shimmer swaps with arriving output via opacity only, so it never shifts the transcript (previously 4 mount/...

X Description: Summary Rework the thinking indicator into a single fixed-height slot on the last turn — shimmer swaps with arriving output via opacity only, so it never shifts the transcript (previously 4 mount/...

Opengraph URL: https://github.com/simstudioai/sim/pull/5828

X: @github

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6bddf6f improvement(mothership): stable thinking indicator and jump-free stre… TheodoreSpeaks Jul 22, 2026 https://github.com/simstudioai/sim/pull/5828/commits/6bddf6f50bc5caf0dc8cb24b2db2f7d52c50af29
20ce8b5 fix(mothership): suppress shimmer over executing tool rows and seed c… TheodoreSpeaks Jul 22, 2026 https://github.com/simstudioai/sim/pull/5828/commits/20ce8b578cf940a88d07f3a9dedac1bbce803ef0
23e3875 fix(mothership): keep shimmer mounted through the slot collapse so it… TheodoreSpeaks Jul 22, 2026 https://github.com/simstudioai/sim/pull/5828/commits/23e38758b16a342c119723da9f50dd728159f594
817c1c9 improvement(mothership): tighten transcript bottom padding, timed slo… TheodoreSpeaks Jul 22, 2026 https://github.com/simstudioai/sim/pull/5828/commits/817c1c991e4032d23a964da4d6ec23a958d74d88
7c37401 fix(mothership): bridge hidden special-tag streaming with the shimmer TheodoreSpeaks Jul 22, 2026 https://github.com/simstudioai/sim/pull/5828/commits/7c37401dd00d59c0451d23bab66673346d02fb62
8ac08dd fix(mothership): hold sizer floor through reveal and reset chase dead… TheodoreSpeaks Jul 22, 2026 https://github.com/simstudioai/sim/pull/5828/commits/8ac08dd2b3aa338c7600f5403a995e1c456ff7d6
65c9cf2 improvement(mothership): swap actions into the thinking slot at settl… TheodoreSpeaks Jul 22, 2026 https://github.com/simstudioai/sim/pull/5828/commits/65c9cf2e24ec75303e09d62a073def7310214b93
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