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MCP vs Custom REST Tooling: Security and the Latest MCP Architecture

A simple guide to understand how MCP works, what has changed in the latest architecture, and how to build more secure AI agent systems. AI agents are becoming more useful because they can do more than just generate text. They can access databases, call APIs, read files, work with GitHub, and perform other actions through external tools.

  • MCP simplifies AI tool integration without built-in security
  • Custom REST tooling replaced by @mcp.tool() decorator
  • Latest MCP architecture includes stateless design and streamable HTTP

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