Claude Code Session Compaction in 2026: How Context Summarization Works and What Your Agent Forgets
Claude Code Session Compaction in 2026: How Context Summarization Works and What Your Agent Forgets This article was written with the assistance of AI, under human supervision and review. Most Claude Code session failures stem from a single misunderstanding: developers treat the 200K context window as infinite storage when it is actually a rolling buffer with aggressive summarization. The agent…
Claude Code session failures often occur due to developers treating the 200K context window as unlimited storage. When this limit is reached, the agent compacts its history into a lossy summary, leading to critical context being forgotten. This happens silently and without warning. The agent continues responding, but the detailed reasoning chains, rejected approaches, and edge cases from earlier in the session are lost.
The key takeaway is that developers must externalize constraints, decisions, and open tasks into persistent artifacts to maintain continuity across compaction boundaries.
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