Hi, I am a developer who have some basic knowledge of AI Agent, RAG and Multi-Agent Dialogues. Now I have a small project on hand, which I need to build a AI Agent on the finance industry to give some realtime information to my clients. When I am choosing different AI Agent platforms, I have some difficulties. Right now, I am comparing among Google Vertex AI Agent Builder, Microsoft Azure AI Agents and Salesforce AI Agents. Any suggestions or some free AI Agent Builder recommendations?I am actually cost-sensitive, for example, Google Vertex AI Agent builders have price is $12 per 1,000 queries, and Vertex AI search is $2 per 1,000 queries, which is a little bit above my budget limit.