How to Implement AI Agents in Rails With RubyLLM

Chat-based agents are augmented LLM interfaces with access to a list of predefined tools. RubyLLM Agents are reusable AI assistants implemented as models with their configuration, runtime context, and prompt conventions. Let’s see how we can start implementing custom OpenAI chat agents with access to SERP tools with the help of the RubyLLM gem. Note the difference between fully autonomous agents like Claude Code or Codex, and chat-based agents that still react to user input. This post is about the latter.