# The Wise Negotiator

- **Event:** [OpenEnv Hackathon SF](https://cerebralvalley.ai/e/openenv-hackathon-sf)
- **When:** Mar 7 at 9:00 AM – Mar 8 at 12:00 AM (PST)
- **Where:** Shack15, San Francisco, CA
- **Team:** [Murugs Karmegam](https://cerebralvalley.ai/u/Muruga)
- **GitHub:** https://github.com/murugamayuk/negotiation-arena
- **Demo video:** https://youtu.be/agAIMZD7BoI
- **Hugging Face:** https://huggingface.co/spaces/murugamayuk/negotiation-arena
- **Gallery:** https://cerebralvalley.ai/e/openenv-hackathon-sf/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/openenv-hackathon-sf/hackathon/gallery/19

The Wise Negotiator is a universal negotiation environment where an LLM agent learns WHO it’s talking to using Bayesian belief updates — and shifts strategy accordingly. Built on OpenEnv, it supports multiple domains: guitar sales, car sales, property, and an HR hiring mode where the LLM plays recruiter against three candidate personalities (GrowthSeeker, StabilitySeeker, MarketExplorer). Every round, a belief tracker updates probabilities based on price movement and language signals, injecting a strategy hint directly into the observation. The agent is trained with GRPO using Qwen2.5-1.5B-Instruct, LoRA r=16, num_generations=2 (2-GRPO), and beta=0.0 (DAPO). Reward is composite: 70% price outcome + 20% empathy + 10% efficiency.

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Markdown version of https://cerebralvalley.ai/e/openenv-hackathon-sf/hackathon/gallery/19. Site index for agents: https://cerebralvalley.ai/llms.txt · full text: https://cerebralvalley.ai/llms-full.txt