Claude Code 'Summarize Up to Here' in Rewind Menu: Manual Context Compaction Mid-Conversation to Reclaim Token Budget Without Losing Key Decisions

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Claude Code added a 'Summarize up to here' option in the Rewind menu, letting you manually compress earlier context during long sessions. Unlike automatic compaction that fires at token thresholds, this gives you surgical control over when to compress and what range to summarize. The practical technique: in long implementation sessions, use 'Summarize up to here' after completing a major milestone to reclaim token budget while preserving key decisions and context, keeping the agent sharp for remaining work.