Glossary · Agents & harnesses

ReAct pattern

An agent prompting technique that interleaves reasoning traces ("thought") with actions ("act") so the model can plan and use tools step by step.

Related terms

• AI agent
• JSON mode
• LangChain
• LlamaIndex
• MCP server
• Model Context Protocol (MCP)

Vynaris is an inference gateway that routes each request to the cheapest right-sized model and shows the receipt. Get an API key or read the docs.