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c7aaf23a6f
Two issues remained after the cyclic-schema fix in #5478: 1. resolve_refs() silently degraded recursive $ref pointers to {}, causing sanitize_tool_params_for_anthropic_strict (and the OpenAI variant) to produce children.items == {} for tree-shaped schemas. Fix: return a type-preserving stub ({"type": "object"}) instead of an empty dict when a circular reference is detected. 2. create_model_from_schema() called jsonref.replace_refs() which throws JsonRefError on circular $ref graphs. Fix: catch the error and fall back to _inline_top_level_ref(), which manually resolves the top-level $ref while preserving $defs for inner resolution. The existing in_progress cycle detection in _build_model_from_schema then handles recursive references via ForwardRef. Tests added for both paths, including mutual-recursion scenarios. Co-Authored-By: João <joao@crewai.com>