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MCP Servers Add Capability, Agent Skills Add Know-How — Here Is the Difference

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AI agent directories often present users with a choice between installing an MCP server or an agent skill, but the two solve fundamentally different problems. A skill is a plain-language instruction file that teaches an agent how to perform a task better, requiring no background process or code execution. An MCP server, by contrast, is running code that connects the agent to live systems like databases or calendars, and carries greater security implications since it executes with the user's privileges. The most common mistake is responding to a know-how gap with more tools, which can make an under-instructed agent more capable of causing harm rather than more competent. Agent Plugins 1.0, released in August 2026, bundles both types into a single package, but the standard governs packaging only — not trust.

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