Model Context Protocol (MCP): A Practical Intro

The Model Context Protocol (MCP) is a standard way to expose tools, data, and prompts to a language model. Instead of wiring each integration by hand, you speak one protocol.

The core idea

An MCP server advertises capabilities (tools to call, resources to read), and any MCP-aware client can use them. The model gets a consistent interface no matter what sits behind it.

Why it helps

One integration surface instead of many bespoke ones.
Tools are reusable across different clients and models.
Clear boundaries make permissions and auditing easier.

When to use it

If you are connecting a model to one service, a direct call is fine. The moment you have several tools, or want them to work across multiple clients, MCP earns its keep.

A quick example

Drop a gist URL on its own line in the Markdown and it embeds inline:

	class HelloWorld
	def initialize(name)
	@name = name.capitalize
	end
	def sayHi
	puts "Hello #{@name}!"
	end
	end

	hello = HelloWorld.new("World")
	hello.sayHi

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