MCP vs function calling: they are not rivals
Function calling is how a model asks for a tool. MCP is how that tool got there. Where the two meet, and what MCP adds once you have more than a few.
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Scoring philosophy, MCP security, and what changed this week.
MCP vs API: what changes when the caller is a model
MCP does not replace your API, it usually wraps one. What actually differs under the stateless 2026-07-28 spec, and what wrapping costs you in security.