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Sweep 22 Sep 2026 · 17:19Z Build v2.1.280 501 read Stable v2.1.267 Latest v2.1.280 Next v2.1.280 Feeds RSS JSON llms.txt Unofficial
Claude Code v2.1.260 ·

Structured-output tool now lints schemas for unsatisfiability

StructuredOutput schemas are now linted for internally-contradictory constraints.

TierUnder the hoodhow much it should matter to you
Useful2my rating, 1 to 5
Signal1worth watching, 1 to 5
AreaStructured Outputwhat it touches
KindImprovementsin v2.1.260,
Under the hood No documentation found

StructuredOutput schemas are now linted for internally-contradictory constraints.

StructuredOutput tool schemas are now analyzed for internally-contradictory constraints, such as crossed min/max bounds, required properties missing from properties with additionalProperties: false, and enum/const type mismatches, in addition to the existing strict-schema conversion. Findings are surfaced via a new unsatisfiable field and reported through the tengu_structured_output_schema_lint telemetry event.

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Names in the bundletengu_structured_output_schema_lint

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