cc-warmup

Does Claude Code warm up or fade?

Splits each session into early, mid, and late thirds — then measures tool execution rate in each phase. Shows whether Claude accelerates, plateaus, or decelerates within a session.

Usage

npx cc-warmup
npx cc-warmup --json

Or open index.html in a browser and drag in .jsonl files.

Metrics

• Phase rates — tools/hr in early / mid / late thirds
• Pattern — warmup (accelerating) / flat / fade (decelerating)
• Median ratio — late phase rate ÷ early phase rate
• Top sessions — biggest warmup and fadeout examples

Sample output

cc-warmup — Does Claude Code warm up or fade?

Sessions analyzed: 330

Average pace by session phase  (tools/hr)
  early    ████████████████████  195  (first third)
  mid      ███████████░░░░░░░░░  107  (middle third)
  late     ████████████░░░░░░░░  121  (final third)

Session patterns
  warmup  ██████░░░░░░░░░░░░░░░░   26%  (86)  rate increases as session progresses
  flat    ███░░░░░░░░░░░░░░░░░░░   14%  (47)  rate stays roughly constant
  fade    █████████████░░░░░░░░░   60%  (197)  rate decreases as session progresses

Median late/early ratio: 0.64×
Sessions tend to decelerate — context fills, pace drops.

License

MIT