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What
When a model fallback causes structured output to be retracted and no retry succeeds, Claude Code now surfaces a more specific error message instead of the previous "the cloud agent called StructuredOutput but every attempt failed schema validation."
New message: "the cloud agent called StructuredOutput but no attempt produced a surviving valid output (failed schema validation, or retracted by a model fallback)"
Evidence
Updated error string (search for "retracted by a model fallback and no retry produced a valid result")
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.