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.
Lock contention is now a distinct prompt-history write failure
Under the hood
Useful1Signal1
Telemetry
Prompt-history saves blocked by another process are now tracked separately from real write failures.
What's wrong with this entry?
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What
When saving prompt history fails because another process held the lock, it is reported under its own key rather than counted as a generic write failure.
Details
Detected from the error's telemetry code being lock-contended or lock-acquire-failed; the distinct key is history_save_lock_failed.
Evidence
history_save_lock_failed
Strings lifted out of the shipped bundle, so the claim above can be checked against them.