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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.

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Claude Code v2.0.11 8 Oct 2025

Structured Outputs Support (Beta)

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 →