Group of 2 Under the hood
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Merged assistant messages can preserve the API's original content block ordering rather than concatenating.
Assistant message merging (ets) gained an alternate path that, when echoApiBlockOrder is true and both messages carry an apiBlockIndex, merges content blocks by their original API index order instead of simple concatenation, threading apiBlockIndices through the message.
Transcript compaction now supports the same echoApiBlockOrder option plus a new echoWireToolInputs option; when set, these preserve raw wire tool inputs (wireToolInputs) and original API block ordering (apiBlockIndex/apiBlockIndices) instead of normalizing them, likely for diagnostics or exact-replay of assistant tool calls.
Names in the bundleechoApiBlockOrder