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  5. Function Calling
Agents & Tool Use

Function Calling

Function calling is a structured interface in which a model selects a declared function and supplies arguments matching its schema.

Ask Melo about this← all terms

The host exposes names, descriptions, and parameter definitions in the model context. It validates and runs the requested call, then may send the result back for interpretation or another decision.

Related terms

Agentic WorkflowTool UseReAct PatternAgent LoopFlowiseGemini Enterprise Agent Platform

Where Function Calling comes up

  • What is MCP? Model Context Protocol: Complete Architecture Guide (2026)
  • Google Research ToolGrad: Answer-First Tool-Use Dataset Generation
  • Structured Output and JSON Mode Prompting: A Complete Guide for 2026
  • Gemini 3.5 Transcribe: What Builders Actually Get