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# Why Compaction replaces the live conversation history, so hooks that use `SessionStart` to re-inject durable model context need a way to run again after that rewrite. Related - #19905 adds dedicated compact lifecycle hooks # What - add `compact` as a supported `SessionStart` source and matcher value - change pending `SessionStart` state from a single slot to a small FIFO queue so `resume` / `startup` / `clear` can be preserved alongside a later `compact` - drain all queued `SessionStart` sources before the next model request, preserving their original order # Testing The new integration coverage verifies both the basic `compact` matcher path and the stacked `resume` -> `compact` case where both hooks contribute `additionalContext` to the next model turn.