Feature Request: Context Threshold Hooks

Current Limitation

Hooks only fire reactively - PreCompact triggers when context is already at ~95% and compaction is imminent. There is no way to proactively monitor context usage or fire hooks at earlier thresholds.

Requested Features

1. Add context percentage to hook input data

• Include in all hooks, or at minimum PreCompact
• Fields: , ,

2. Add new ContextThreshold hook event

• Fires at user-configurable percentages (e.g., 80%, 90%)
• Multiple thresholds can be configured
• Fires ONCE per threshold per session (not repeatedly)

Use Case

I use PreCompact to auto-save full session transcripts before compaction. This works, but I would prefer to save proactively at 80% context rather than reactively at 95%. This gives buffer room and allows the save to happen while there is still working space for Claude to complete current tasks.

Proposed Implementation

Hook input would include:

Benefits

• Proactive session management vs reactive-only
• Users can save/backup at comfortable thresholds
• PreCompact remains as safety net at ~95%
• Better user control over context lifecycle
• Enables early warning notifications

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Submitted by: MIS (Magnetic Innovative Solutions LLC)