- In short
- Direct API or SDK integration gives the most control over request shape and error handling but requires custom code per tool. An MCP server centralises tool exposure and reuse across multiple agents or applications, at the cost of an additional layer to operate and secure. Agent-to-agent protocols suit scenarios where two independently operated agent systems must exchange tasks or results directly. The right pattern depends on reuse, control needs, and whether independent systems must interoperate.
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