Update README.md

README.md

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 # Model Card: SAP-4B
 
+**paper:** [SAP: State-Guided Data Synthesis with Argument Provenance for Multi-Turn Tool Use](https://arxiv.org/abs/2609.06124)
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 ## Model Overview
 SAP-4B is a 4B-parameter agentic language model specialized in **long-horizon multi-turn tool use and function calling**. It is trained via supervised fine-tuning (SFT, no reinforcement learning) on high-quality, executor-validated trajectories with explicit argument provenance annotations. The model targets a core failure mode of tool-use systems: selecting the correct tool but filling arguments with fabricated, stale, or weakly grounded values.