Author

Abdullah Garra

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Preprint Oct 2026

The TellTail of Embeddings: Fingerprinting Retrievers in Black-Box Systems

Dense embedding models are core to modern text retrieval, enabling systems ranging from web search to retrieval-augmented generation (RAG). Yet, retrievers are usually deployed within opaque systems, exposing only ranked results, cited sources, or generated answers. This opacity prevents users from verifying which retr...

Abdullah Garra, Matan Ben-Tov, Mahmood Sharif · 0 citations

Preprint Sep 2026

Mitigating Emergent Collusion in LLM Pricing Agents

Recent work shows that LLM-based pricing agents can produce supracompetitive outcomes in repeated oligopoly environments without being explicitly instructed to collude. We reproduce the qualitative prompt-sensitivity effect of Fish et al. using DeepSeek-V3.1: the P1 prompt produces significantly higher prices and profi...

Abdullah Garra · 0 citations