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msd-core/docs/features/context-window-monitoring.md
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22 Context Window Monitoring Context Engineering Features

Purpose: Prevent context rot by alerting both user and agent when context is running low.

Requirements:

  • REQ-CTX-01: Statusline MUST display context usage percentage to user
  • REQ-CTX-02: Context monitor MUST inject agent-facing warnings at the WARNING fire-point — ≤35% remaining by default, overridable per project via hooks.context_warning_threshold
  • REQ-CTX-03: Context monitor MUST inject agent-facing warnings at the CRITICAL fire-point — ≤25% remaining by default, overridable per project via hooks.context_critical_threshold
  • REQ-CTX-04: Warnings MUST debounce (5 tool uses between repeated warnings)
  • REQ-CTX-05: Severity escalation (WARNING→CRITICAL) MUST bypass debounce
  • REQ-CTX-06: Context monitor MUST differentiate MSD-active vs non-MSD-active projects
  • REQ-CTX-07: Warnings MUST be advisory, never imperative commands that override user preferences
  • REQ-CTX-08: All hooks MUST fail silently and never block tool execution

Architecture: Two-part bridge system:

  1. Statusline writes metrics to /tmp/claude-ctx-{session}.json
  2. Context monitor reads metrics and injects additionalContext warnings