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When providers like DeepSeek do not support the json_schema response_format type, structured output requests now fall back to prompt-based JSON extraction instead of failing with a 400 error. Changes: - Add supports_json_schema flag to ProviderConfig (default True, False for DeepSeek) - Override _prepare_completion_params to strip json_schema and inject schema instructions - Override _handle_completion, _ahandle_completion, _handle_streaming_completion to use prompt-based fallback instead of beta.chat.completions.parse - Add comprehensive tests for the fallback behavior Co-Authored-By: João <joao@crewai.com>