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Add ASCII diagram to compaction docs

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Mario Zechner 2025-12-24 12:48:16 +01:00
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commit ea16af8b72
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packages/coding-agent/docs/hooks.md
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@ -183,10 +183,31 @@ For `before_branch` and `branch` events, `event.targetTurnIndex` contains the en
The `before_compact` event lets you implement custom compaction strategies. Understanding the data model:
**How default compaction works:**
1. When context exceeds the threshold, pi finds a "cut point" that keeps ~20k tokens of recent turns
2. Messages before the cut point are summarized and discarded
3. Messages after the cut point are kept verbatim
4. The summary + kept messages become the new context
When context exceeds the threshold, pi finds a "cut point" that keeps ~20k tokens of recent turns:
```
Session entries (before compaction):
┌─────────────────────────────────────────────────────────────────┐
│ [header] [prev compaction] [msg] [msg] [msg] [msg] [msg] [msg] │
│ ↑ └─────┬─────┘ └───────┬───────┘ │
│ previousSummary messagesToSummarize messagesToKeep│
│ (will be discarded) (kept as-is) │
│ ↑ │
│ cutPoint.firstKeptEntryIndex │
└─────────────────────────────────────────────────────────────────┘
After compaction:
┌─────────────────────────────────────────────────────────────────┐
│ [header] [prev compaction] [NEW compaction] [msg] [msg] [msg] │
│ └──────┬──────┘ └───────┬───────┘ │
│ summary of messagesToKeep │
│ messagesToSummarize (unchanged) │
│ + previousSummary │
└─────────────────────────────────────────────────────────────────┘
```
The new compaction entry's `firstKeptEntryIndex` tells the session loader where to start reading messages after the summary.
**Event fields:**