feat: add double-buffer compaction for context window management#1203
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marklubin wants to merge 1 commit intoanthropics:mainfrom
Open
feat: add double-buffer compaction for context window management#1203marklubin wants to merge 1 commit intoanthropics:mainfrom
marklubin wants to merge 1 commit intoanthropics:mainfrom
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Proactive context compaction using double buffering: checkpoint at a configurable threshold, continue working while summarization runs in the background, then swap to the pre-built back buffer at the swap threshold. Includes checkpoint index tracking for correct concurrent-phase mirroring, stop-the-world fallback with recent-tail preservation, and optional renewal policies (recurse/dump).
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Summary
Adds double-buffered context window compaction (sync + async). Background checkpoint at 70%, swap at 95%, stop-the-world fallback, configurable timeout, incremental summary accumulation with renewal policies.
Reference: https://marklubin.me/posts/hopping-context-windows/
Testing
44 unit tests pass.
AI Disclosure
Developed with Claude (Anthropic). All code reviewed, tested, and validated by the author.
Staging PR on fork — will open upstream PR from here when ready.