AgentMaster: A Modular Multi-Agent Framework with A2A and MCP Protocols via a Unified Conversational Interface

The rise of Multi-Agent Systems (MAS) in Artificial Intelligence (AI), especially integrated with Large Language Models (LLMs), has greatly facilitated the resolution of complex tasks. However, current systems are still facing challenges of inter-agent communication, coordination, and interaction with heterogeneous tools and resources. Most recently, the Model Context Protocol (MCP) by Anthropic and Agent-to-Agent (A2A) communication protocol by Google have been introduced, and to the best of our knowledge, very few applications exist where both protocols are employed within a single MAS framework. We present \textbf{\textit{AgentMaster}}, a novel modular multi-protocol MAS framework with self-implemented A2A and MCP, enabling dynamic coordination and flexible communication across agent-to-agent, agent-to-tool, and agent-to-resource channels. Through a unified conversational interface, the pilot system supports natural language interaction without prior technical expertise and responds to multimodal queries for tasks including information retrieval, question answering, and image analysis. Evaluation through the BERTScore F1 and LLM-as-a-Judge metric G-Eval averaged 96.3% and 87.1%, revealing robust inter-agent coordination, query decomposition, dynamic routing, and domain-specific, relevant responses. Overall, our proposed framework contributes to the potential capabilities of domain-specific, cooperative, and scalable conversational AI powered by MAS.