Add model card metadata and description

README.md

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-license: apache-2.0
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+---
+license: apache-2.0
+library_name: transformers
+pipeline_tag: text-classification
+---
+
+# ShadowMem Judge Model
+
+This repository contains a judge model from the paper [Safeguarding LLM Agents against Long-Horizon Threats via Shadow Memory](https://huggingface.co/papers/2605.03228).
+
+ShadowMem is a defensive framework that maintains a dedicated, safety-focused agentic memory — inspired by the *shadow stack* abstraction in systems security — to distill and retain safety-critical context across an agent's full execution trajectory, and uses this shadow memory to proactively assess pending actions before they are executed.
+
+The model is the trained shadow-memory judge used to evaluate pending actions during agent execution.
+
+Code: https://github.com/ZJUWYH/ShadowMem
+
+## Citation
+
+```bibtex
+@inproceedings{wang2026shadowmem,
+  author    = {Yuhui Wang and Tanqiu Jiang and Jiacheng Liang and Charles Fleming and Ting Wang},
+  title     = {Safeguarding {LLM} Agents against Long-Horizon Threats via Shadow Memory},
+  booktitle = {Proceedings of the 2026 ACM SIGSAC Conference on Computer and Communications Security},
+  series    = {CCS '26},
+  year      = {2026},
+  publisher = {Association for Computing Machinery},
+  doi       = {10.1145/3830454.3846601},
+  url       = {https://doi.org/10.1145/3830454.3846601}
+}
+```