Glossary · Agents & harnesses

tool use

The general practice of an LLM invoking external tools, APIs, or code during a conversation to extend its capabilities beyond text generation.

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.