Apply when context is filling up: large outputs, long files, repeated reads, fan-out planning. Route bulk to subagents; keep summaries in the main thread, not raw payloads.
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name: principle-guard-the-context-window
description: "Apply when context is filling up: large outputs, long files, repeated reads, fan-out planning. Route bulk to subagents; keep summaries in the main thread, not raw payloads."
---
# Guard the Context Window
**Why:** Context overflow degrades reasoning quality, creates compression artifacts, and halts progress.
**Pattern:**
- **Size phases and cap scope.** Limit files per phase, set turn budgets, account for mechanism costs.
