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Reading a new release v2.1.251 Analysing changes · 2/5 Sorting the findings · 1/4 steps 470 findings $18.91 so far

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.0.56

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.0.56 →