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Many developers confuse them a lot -- but they're actually not interchangeably in any way.
They all extend Claude Code but they do it very differently and for very different reasons. They solve specific problems that the others can’t.
First let's understand what each of them do on their own.
A Skill is a reusable set of instructions that Claude can load when performing a task. Skills help Claude apply project-specific standards, follow established processes, and consistently execute repeatable tasks.
Model Context Protocol (MCP) is an open protocol that enables Claude to connect to external tool and software systems. MCP servers let Claude discover available tools and interact with connected resources.
A Plugin is an installable extension for Claude Code that packages one or more components or configurations -- into a reusable, shareable unit.
Here's a real-world scenario that illustrates the crucial difference:
Imagine having a chef that learns your family's special cake recipe.
Skills: the mental playbooks, checklists, and habits stored in your brain.
Now they know how to cook it.
But they still only have the ingredients already in the kitchen.
MCP: The physical tools you use to achieve goals in the real world.
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