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Tool calling is the process where an AI model decides to invoke an external capability, such as search, code execution, or database lookup, to complete a task.
It extends AI assistants beyond static text generation, enabling grounded and actionable workflows.
An assistant calls a calendar tool to find availability before proposing meeting times.
Function Calling
Function calling lets an AI model return structured instructions to invoke predefined code functions or APIs instead of only plain text. The application then executes the function and can pass results back to the model.
MCP (Model Context Protocol)
MCP is an open protocol that standardises how AI assistants connect to external tools, data sources, and services. It defines a consistent interface so models can discover capabilities and request actions safely.
API (Application Programming Interface)
An API is a set of rules and protocols that allows different software applications to communicate with each other. In AI, APIs let developers integrate AI capabilities — like text generation or image analysis — into their own applications without building models from scratch.
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