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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.239 ·

Stall detection separates real hangs from clock jumps

A system clock jump no longer gets misreported as Claude Code hanging.

You'll notice Internal Changes
JSON All of v2.1.239
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Internal ChangesKind: in v2.1.239,
Internal ChangesSection of the release
What

The event-loop stall detector now measures elapsed time with a monotonic clock as well as the wall clock, so a system clock jump is no longer reported as a stall.

Details
  • New reported fields: monotonic stall duration, clock jump, whether a slow terminal write was blocking, and whether a resume signal (SIGCONT) was seen, meaning the machine had been suspended.
  • Reporting is deferred to the next tick so measuring the stall does not lengthen it.
  • Runs whenever the detector is started.
Evidence

monotonic_stall_ms

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.239 →

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