Posted in Web Azure Agentic AI- unable to register and run custom function call July 31, 2025 Add the @tool decorator from azure.ai.agents above your fetch_weather function. This makes the function discoverable and callable Without this decorator, FunctionTool cannot recognize the function by name. https://stackoverflow.com/questions/79625262/azure-agentic-ai-unable-to-register-and-run-custom-function-call