This paper presents Compliance Brain Assistant (CBA), a conversational agent AI assistant designed to improve the efficiency of employees’ daily compliance tasks in corporate environments. CBA uses a user query router that provides two modes to balance response quality and latency. First, FastTrack mode, which processes simple requests, retrieves relevant information from a knowledge repository. Second, FullAgentic mode, which processes complex requests, proactively searches for context in various compliance documents and performs complex operations and tool calls to process requests by leveraging different APIs/models. Experimental evaluation results show that CBA significantly improves the performance of the existing LLM in terms of average keyword matching rate (83.7% vs. 41.7%) and LLM evaluation pass rate (82.0% vs. 20.0%) for a variety of real-world privacy/compliance-related queries. In addition, the routing-based design is compared with fast-track only and full-agentic modes, and the results show that the average matching rate and pass rate are higher while maintaining almost the same execution time, verifying the hypothesis that the routing mechanism provides a good balance between the two modes.