Complete AI Agent Glossary

A comprehensive reference for AI agent terminology. Bookmark this page.

## A **Autonomous Agent** — an AI system that can plan, act, and observe outcomes without step-by-step human instruction **Agentic Loop** — the observe-think-act cycle an AI agent repeats to complete a task **Action Space** — the set of all operations an agent is permitted to execute

## C **Chain of Thought** — a prompting technique where the model reasons step by step before answering **Context Window** — the maximum amount of text a model can process in a single call

## F **Fine-tuning** — adapting a pre-trained model to a specific domain using labeled examples **Function Calling** — a model capability that lets agents invoke external tools and APIs

## R **RAG (Retrieval-Augmented Generation)** — combining search with generation to ground responses in real data **ReAct** — a prompting framework combining Reasoning and Acting for agentic tasks

## Z **Zero-shot** — completing a task with no examples provided in the prompt **Zero-trust** — a security model where no agent or user is trusted by default