strategic-compact

# Strategic Compact Skill Suggests manual `/compact` at strategic points in your workflow rather than relying on arbitrary auto-compaction. ## When to Activate - Running long sessions that approach context limits (200K+ tokens) - Working on multi-phase tasks (research → plan → implement → test) - Switching between unrelated tasks within the same session - After completing a major milestone and starting new work - When responses slow down or become less coherent (context pressure) ## Why Strategic Compaction? Auto-compaction triggers at arbitrary points: - Often mid-task, losing important context - No awareness of logical task boundaries - Can interrupt complex multi-step operations Strategic compaction at logical boundaries: - **After exploration, before execution** — Compact research context, keep implementation plan - **After completing a milestone** — Fresh start for next phase - **Before major context shifts** — Clear exploration context before different task ## How It Works The `suggest-compact.js` script runs on PreToolUse (Edit/Write) and combines two signals: 1. **Context size (primary)** — Reads the latest `usage` record from the session transcript (`transcript_path` in the hook payload) and sums `input_tokens + cache_read_input_tokens + cache_creation_input_tokens` (the true context size of the turn). Suggests `/compact` at a window-scaled threshold — 160k tokens on a 200k window, 250k on a 1M window (detected from a `[1m]` model marker, or inferred when ob...