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A long instrument bench in a bright protocol-interoperability lab with several distinct demonstration stations laid out in a row, the nearest station's cable caught half into a hub of uniform ports while the other stations continue down the bench

AI Infrastructure

Function Calling, MCP, and the Other Ways to Give a Model Tools

A model that only emits text cannot query a database or send an email. Four documented patterns cross that boundary, and each one answers a different question — none is a smaller version of another.

By Brecht Corbeel · August 12, 2026 · 18 min read

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