# 18 - Copilot Extensions and Marketplace

Extend Copilot with Extensions and Skillsets from the Marketplace. MCP integration, third-party agents (Claude, Codex), and how to create your own custom extension.

## What you'll learn

- Extensions Architecture
- Types of Extensions
- Skillset Structure
- Use Cases for Skillsets
- Authentication and Authorization

*This article is part of the **GitHub Copilot** series on federicocalo.dev.*

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## Read the full article

The complete article (14 min read) with code examples, diagrams, and practical exercises is available here:

**➡️ [18 - Copilot Extensions and Marketplace](https://federicocalo.dev/en/blog/github-copilot-extensions-marketplace)**

`https://federicocalo.dev/en/blog/github-copilot-extensions-marketplace`

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*By [Federico Calò](https://federicocalo.dev) — Software Developer & Technical Writer*