Compaction Duration Fix Explained

Output

Compaction Data Analysis

What You're Seeing

2 COMPACTION TURNS	We detected `hadCompaction: true` in 2 records
— DURATION	All 4 records have `compactionDurationMs: null`
10% OF RECENT	Correct: 2 compactions out of ~20 recent turns

Root Cause Found

The auto_compact_end event (with duration) is only sent when a non-system event arrives after compaction.

Edge case: If Claude compacts and then immediately exits (no more tool calls), there's no non-system event to trigger auto_compact_end!

Fix Applied

Added check in konsole/src/stream.ts before sending kontext:

// If we were still compacting when stream ended, send the end event now
if (compactionStartedAt > 0) {
  const durationMs = Date.now() - compactionStartedAt;
  sendEvent(controller, encoder, { type: "auto_compact_end", durationMs });
}

Next Steps

Restart konsole to pick up the fix. Future compactions will record duration.

Quick Actions

Original Request

No layout configured

Details

Type General

Status Completed

Scope vibetools

Tags telemetrycompactionbugfix

Created 4 Jan 2026, 10:51 am

Updated 4 Jan 2026, 10:51 am

Created By claude

Raw Data

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  "id": "6b037afe-47f8-48ed-8686-db97bc7c127c",
  "type": "general",
  "status": "completed",
  "title": "Compaction Duration Fix Explained",
  "description": "Found and fixed edge case where compaction duration wasn't captured",
  "context": {
    "output": "<div style=\"background:#1e1e1e;color:#e0e0e0;padding:20px;border-radius:8px;font-family:system-ui,sans-serif;\"><h2 style=\"color:#fff;margin:0 0 16px 0;\">Compaction Data Analysis</h2><div style=\"background:#2d2d2d;padding:16px;border-radius:6px;margin-bottom:16px;\"><h3 style=\"color:#61afef;margin:0 0 12px 0;\">What You're Seeing</h3><table style=\"width:100%;border-collapse:collapse;\"><tr style=\"border-bottom:1px solid #444;\"><td style=\"padding:8px 0;color:#e5c07b;width:40%;\">2 COMPACTION TURNS</td><td style=\"padding:8px 0;\">We detected <code>hadCompaction: true</code> in 2 records</td></tr><tr style=\"border-bottom:1px solid #444;\"><td style=\"padding:8px 0;color:#e5c07b;\">— DURATION</td><td style=\"padding:8px 0;\">All 4 records have <code>compactionDurationMs: null</code></td></tr><tr><td style=\"padding:8px 0;color:#e5c07b;\">10% OF RECENT</td><td style=\"padding:8px 0;\">Correct: 2 compactions out of ~20 recent turns</td></tr></table></div><div style=\"background:#2d2d2d;padding:16px;border-radius:6px;margin-bottom:16px;\"><h3 style=\"color:#c678dd;margin:0 0 12px 0;\">Root Cause Found</h3><p style=\"margin:0 0 12px 0;\">The <code>auto_compact_end</code> event (with duration) is only sent when a <strong>non-system event</strong> arrives after compaction.</p><p style=\"margin:0;color:#f87171;\"><strong>Edge case:</strong> If Claude compacts and then immediately exits (no more tool calls), there's no non-system event to trigger <code>auto_compact_end</code>!</p></div><div style=\"background:#2d2d2d;padding:16px;border-radius:6px;margin-bottom:16px;\"><h3 style=\"color:#98c379;margin:0 0 12px 0;\">Fix Applied</h3><p style=\"margin:0 0 8px 0;\">Added check in <code>konsole/src/stream.ts</code> before sending kontext:</p><pre style=\"background:#1e1e1e;padding:12px;border-radius:4px;margin:8px 0 0 0;font-size:0.85rem;overflow-x:auto;\"><span style=\"color:#7f848e;\">// If we were still compacting when stream ended, send the end event now</span>\n<span style=\"color:#c678dd;\">if</span> (compactionStartedAt > <span style=\"color:#d19a66;\">0</span>) {\n  <span style=\"color:#c678dd;\">const</span> durationMs = Date.<span style=\"color:#61afef;\">now</span>() - compactionStartedAt;\n  <span style=\"color:#61afef;\">sendEvent</span>(controller, encoder, { type: <span style=\"color:#98c379;\">\"auto_compact_end\"</span>, durationMs });\n}</pre></div><div style=\"background:#2d2d2d;padding:16px;border-radius:6px;\"><h4 style=\"margin:0 0 8px 0;color:#fff;\">Next Steps</h4><p style=\"color:#9ca3af;margin:0;\">Restart konsole to pick up the fix. Future compactions will record duration.</p></div></div>",
    "requestId": "82adcdba-b69e-4544-aa49-0b50892ccfd2",
    "choices": [
      {
        "label": "Restart konsole",
        "value": "Restart konsole service to pick up the compaction duration fix",
        "primary": true
      },
      {
        "label": "Commit fix",
        "value": "Commit and push the compaction duration fix"
      },
      {
        "label": "View code",
        "value": "Show the full context of the fix in stream.ts"
      }
    ]
  },
  "createdBy": "claude",
  "createdAt": "2026-01-04T00:51:25.617Z",
  "updatedAt": "2026-01-04T00:51:25.786Z",
  "requestId": "82adcdba-b69e-4544-aa49-0b50892ccfd2",
  "scope": "vibetools",
  "tags": [
    "telemetry",
    "compaction",
    "bugfix"
  ],
  "targetUser": "claude"
}