Elasticsearch plays a pivotal role in grounding large language models (LLMs) within the Microsoft Azure AI Foundry Agent Service, ensuring agents generate accurate and trustworthy responses based on proprietary enterprise data. By integrating Elasticsearch, developers can connect AI agents to verified, context-rich information, enhancing their reliability beyond generic LLM training knowledge. The Microsoft Azure AI Foundry Agent Service, built on a robust framework, provides a platform for building and managing multi-agent systems utilizing knowledge bases and tools accessed through the Model Context Protocol (MCP) and the Agent-to-Agent (A2A) protocol. This integration allows for sophisticated workflows where Elasticsearch serves both as a retrieval tool and a collaborative agent, enhancing data retrieval and orchestration capabilities. The partnership between Elasticsearch and Microsoft Azure AI Foundry ensures trust, accuracy, and speed, enabling enterprises to implement comprehensive agent strategies that maximize the utility of both platforms.