MCP and Tool Integration Protocols
Why the industry standardized tool integration, and how to reason about it in a design interview
The concept and design-interview layer above MCP: why a standard client-server protocol replaced bespoke per-app tool integrations, the server/client/resource/tool abstractions at an architectural level, what MCP adds on top of plain function calling (and when bespoke calling is still the right answer), the trust boundary a third-party server introduces, and how to frame the 'build a server vs write a function' decision when an interviewer asks.
Practice questions (5)
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MCP Server or Bespoke Integration?
Intermediate · Free -
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Explaining the Integration Problem MCP Solves
Intermediate -
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Reviewing an Untrusted MCP Server Before Connecting It
Intermediate -
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Why Tools, Resources and Prompts Aren't Interchangeable
Intermediate -
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What MCP Adds on Top of Function Calling
Intermediate