XianyuAutoAgent is an AI-powered customer service bot for the Chinese second-hand marketplace platform Xianyu (闲鱼). It connects via WebSocket to Xianyu's messaging service, receives user messages, and generates intelligent replies using a Large Language Model (LLM) with multi-expert routing. The system features intent classification (price negotiation, technical support, general query), dynamic pricing negotiation with gradual concessions and adaptive LLM temperature, context-aware conversation management via SQLite, and a manual takeover mode. It handles authentication via cookies, token refresh, heartbeat, and captcha-triggered cookie re-entry. The bot operates as a long-running async process, suitable for deployment via Docker.