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Claude Code v2.0.11 ·

Structured Outputs Support (Beta)

Entry
JSON All of v2.0.11
EntryKind: in v2.0.11,
ChangesSection of the release

What: Support for Claude's new structured outputs API feature via the beta header structured-outputs-2025-09-17

Details:

  • Tools can now opt-in to strict schema validation by setting strict: true
  • When using a model with structured outputs support and tools marked as strict, Claude will enforce exact adherence to the tool's input schema
  • Core tools (Bash, Read, Edit, Write) have been updated with strict: true for improved reliability
  • Automatically detected via model name containing -structured-
  • Evidence: New constant Ey2 = "structured-outputs-2025-09-17" at line 376349 and detection function OV0() at line 376356 in v2.0.11

See this entry in the whole of v2.0.11 →

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