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Fixes #4312 The issue was that MCP servers with complex JSON schemas containing internal $ref references (like Mapbox MCP server) would cause a KeyError when Pydantic tried to generate JSON schemas from dynamically created models. This fix: - Creates a custom CrewAI adapter (CrewAIAdapterWithSchemaFix) that properly resolves all $ref references using jsonref before creating Pydantic models - Implements _resolve_all_refs() to fully resolve JSON Schema references - Implements _create_model_from_schema() that creates Pydantic models without passing problematic extra fields that cause issues during schema generation - Adds comprehensive tests for the new schema handling functionality Co-Authored-By: João <joao@crewai.com>