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Written by Max Zeshut
Founder at Agentmelt · Last updated Sep 9, 2026
A capability that lets AI models invoke structured functions (APIs, database queries, calculations) based on natural-language instructions. Instead of only generating text, the model outputs a JSON function call that your application executes. This is how agents book meetings, update CRMs, and trigger workflows.
A user says 'Book a meeting with John on Friday at 2pm.' The LLM outputs a function call: createCalendarEvent({ attendee: '[email protected]', date: 'Friday', time: '14:00' }). Your app executes the function and confirms the booking.
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