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MCP vs. API: Which protocol should you use for agents?

Every day, more solutions offer a connection to an associated MCP server so that artificial intelligence agents can interact with data and functions from third-party platforms. APIs have served as a bridge between systems for decades, and this new standard is not intended to replace them, but to solve a different layer of the problem: giving agents a common way to discover tools, obtain context, and execute actions. In this article, we compare MCP with traditional APIs, explain their differences, and analyze when it makes sense to use one, the other, or both.