Tool Calling vs. MCP Connectors
Both let models act, but they solve different integration problems.
Tool calling is the model contract
Tool calling gives a model a structured way to request an action. It is best for product-owned capabilities where the app controls validation, execution, and display.
MCP is the integration contract
MCP-style connectors standardize how external capabilities are described and invoked. They help when the same tool surface should work across agents, apps, or environments.
Use both with boundaries
A mature AI app can expose internal tools directly and connect external systems through MCP-like contracts. The important part is not the label; it is permissioning, auditability, and clear user intent.
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