# case-8b-rl-noopsd (step 1912)

**Clinical Agents for Seeking Evidence** - agentic harness learning for
longitudinal medical imaging. The model autonomously plans and calls tools inside a
multi-turn harness (model -> `qwen3_xml` tool call -> environment executes ->
observation -> ... -> final answer); it never answers single-shot. Three role
personas: **Anatomist** (organ segmentation / volumetry), **Radiologist**
(cross-visit image comparison), **Consultant** (report-grounded synthesis).
Paper: *From Given to Gathered Evidence: Agentic Learning for Longitudinal Medical Reasoning*.

Ablation: identical to the final model but **without the OPSD term**
(bucket-IV causal-KL) in the agentic RL objective.

- **Training**: agentic RL - GRPO + rubric-judge reward, causal-KL/OPSD disabled
- **Step**: 1912
- **Base model**: Qwen3-VL-8B-Instruct
- **Format**: merged HF checkpoint (single `model.safetensors` + tokenizer/processor)
- **Serving tip**: run with a tool backend (the released mock-tool replay configs,
  or the full LangGraph agents) and start vLLM with
  `--enable-auto-tool-choice --tool-call-parser qwen3_xml`
  (add `--enforce-eager` when the environment has no full CUDA toolkit)
- **Data**: trained on UK Biobank-derived, access-controlled data; no UKB-derived
  data is redistributed here. Research use only.