Explore the context window changedcontext-window
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16131613## When your context fills up
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1615Claude Code compacts automatically as you approach the limit, so a full context window doesn't end your session. The automatic pass works the same way as the `/compact` step in the timeline. See [When context fills up](/docs/en/how-claude-code-works#when-context-fills-up) for what it preserves.
1615Claude Code compacts automatically as you approach the limit, so a full context window doesn't end your session. The automatic pass works the same way as the `/compact` step in the timeline. See [When context fills up](/docs/en/how-claude-code-works#when-context-fills-up) for what it preserves. For when Claude Code also compacts a conversation you leave idle, see [idle compaction](/docs/en/settings-reference#idlecompaction).
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16171617You can also act before the automatic pass runs:
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