Proactive Rate Limit Warnings

What: Claude Code now warns you before you hit rate limits by monitoring your usage percentage in real-time, rather than only alerting when limits are reached.

How it works:

• 5-hour limits: Warning at 90% usage when 72% through the window
• Weekly limits: Graduated warnings at 25%, 50%, and 75% based on time progression
• Warnings now show exact usage: "75% of weekly limit used · resets in 2 days"

Details:

• New function BX5() at line 341284 reads anthropic-ratelimit-unified-*-utilization headers
• New threshold configuration eW5 at line 341262 defines warning triggers
• Five-hour limit warnings were completely disabled in v2.0.55 (returned null), now active
• Evidence: BX5() at line 341284, AX5() at line 341260, tW5() at line 341242