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When multiple tools run in parallel and one fails, the remaining sibling tool calls now receive a clean error message ("Sibling tool call errored") instead of hanging or producing ambiguous results. This improves reliability when using parallel tool execution.
Evidence
Parallel tool error handling (search for "Sibling tool call errored")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.