# Ch13-Channel-Extension-Mechanism

- [13.1 Extension Architecture Design](/en/ch13-channel-extension-mechanism/13.1-extension-architecture-design.md)
- [13.2 Extension API Surface](/en/ch13-channel-extension-mechanism/13.2-extension-api-surface.md)
- [13.3 Representative Extension Implementations](/en/ch13-channel-extension-mechanism/13.3-representative-extension-implementations.md)
- [13.4 Developing Custom Extensions](/en/ch13-channel-extension-mechanism/13.4-developing-custom-extensions.md)