In Python, a SyntaxError happens when the interpreter finds code that does not conform to the rules of the Python language.

CUDA_VISIBLE_DEVICES=0 \ NPROC_PER_NODE=1 \ MAX_PIXELS=2371600 \ swift rlhf \ --rlhf_type grpo \ --model /logs/qwen/qwen2_5_vl_7b_sftv9/v0-20250730-124707/checkpoint ...

Summary When using complex Pydantic models in MCP tool responses with the current Python SDK v1.12.4, tools fail with the error: TypeError: `dumps_kwargs` keyword arguments are no longer supported.