openclaw - 💡(How to fix) Fix Auto-compaction not triggering despite config (midTurnPrecheck + maxActiveTranscriptBytes)

Description

Auto-compaction does not fire during long sessions, even though the config specifies a 15MB threshold and midTurnPrecheck is enabled. Only manual /compact works.

Config

"compaction": {
  "maxActiveTranscriptBytes": "15mb",
  "keepRecentTokens": 30000,
  "notifyUser": true,
  "truncateAfterCompaction": true,
  "midTurnPrecheck": {
    "enabled": true
  }
}

Observed Behavior

• Session context grew to ~118k tokens over a long conversation
• Manual /compact reliably reduces context to ~34k, confirming there's substantial compaction-worthy content
• openclaw status shows Compactions: 2, but these correspond to my two manual /compact commands — not auto-compactions
• No compaction notification was ever received despite notifyUser: true
• Context dropped slightly (118k → 108k) between messages, consistent with cache-ttl pruning, not compaction
• midTurnPrecheck should catch this mid-conversation but doesn't seem to be triggering

Expected Behavior

• Auto-compaction should fire when context exceeds the 15MB threshold
• A notification should be sent to the user when compaction occurs (notifyUser: true)
• midTurnPrecheck should proactively trigger compaction mid-turn when context is growing too large

Environment

• OpenClaw 2026.5.27 (27ae826)
• Model: xiaomi-coding/mimo-v2.5-pro (1M context window)
• macOS 15.7.5 (x64)
• Webchat channel

Additional Notes

The session status output showing Compactions: 2 is misleading — it's counting manual compactions, making it look like auto-compaction is working when it isn't. Would be helpful to differentiate manual vs auto compaction counts in status output.