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What is Tool calling?
Also called: Function calling
With tool calling, the AI may use tools such as web search, a calendar or a calculator instead of only writing text.
Example
You ask for a free slot and the AI checks your calendar itself.
For pros
The model outputs a structured call with a name and parameters. The application runs it and returns the result. Every tool needs clear permissions and input checks.
Related prompts, skills, agents and tools
Sources: platform.openai.com , docs.anthropic.com · Checked on 19 October 2026
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