#JSON-RPC

A data-center receiving bay with a sealed aluminium case passing through an automated reading arch on a roller conveyor, its tamper-evident seal still intact, while a second case beyond it already carries a freshly printed asset tag

How Tool Protocols and the Model Context Protocol Actually Work

A tool call is not a function call. It is a message crossing a wire between three separately-trusted roles, and the point where it crosses — not the wire format itself — is where a tool protocol's security actually lives or fails.

By Brecht Corbeel · August 26, 2026 · 16 min read

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