MCP architecture scenarios — CCA-F Exam Prep

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REAL STORY

A platform team built 60 custom API integrations for 20 teams. Maintenance was a nightmare. Then they switched to MCP and cut it to 15 reusable servers.

A trading firm wrapped their market data API in MCP. The protocol overhead added 12ms per call. At 50 calls per second, that was 600ms of wasted latency per second. They ripped it out and went back to direct API calls. MCP isn't always the answer. Neither is direct API. The right choice depends on the scenario.