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Agents Beginner Also known as: Function calling · Uso di strumenti · Chiamata di funzione

Tool use

The model's ability to return a structured request to run an external function (search the web, read a file, write to a database) and then resume reasoning with the result.

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In practice

You declare the functions with name, parameters, and description; the model picks when to call them. It is the building block of every agent. Validate arguments carefully: the model sometimes invents parameters or forgets them.

Related terms

Agent MCP

Seen in the wild

12 entries mentioning it
  1. LM Studio 0.3.17 becomes an MCP host: external tools for local models
    High
  2. OpenAI o3 and o4-mini: reasoning models learn to use tools
    High
  3. Hugging Face smolagents: agents that write code instead of JSON
    Medium
  4. OpenAI o1 arrives in the API with function calling, Structured Outputs and vision
    High
  5. Model Context Protocol: the open standard to connect LLMs and data
    High
  6. Open WebUI: Tools and Functions turn the frontend into a plugin platform
    High
  7. Cohere Command R+: an enterprise-focused model built for RAG and tool use
    Medium
  8. Claude 2.1: 200K context and fewer false statements
    High
  9. Function calling: GPT learns to speak JSON
    High
  10. ChatGPT Plugins: the model starts using external tools
    Medium
  11. Toolformer: the LLM that learns to use tools on its own
    High
  12. ReAct: the framework that unites reasoning and acting in LLMs
    Landmark
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