Expired50% confidenceFactExact time
The system prompt layer is a fixed overhead that users cannot modify.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
Valid until: 9/30/2026(expired)
Sources
Claude Code Context Management in Practice: The Five-Layer Backpack and Token Optimization Principles
bilibilionedayhigh6/7/2026
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