> For the complete documentation index, see [llms.txt](https://concordialang.gitbook.io/concordialang/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://concordialang.gitbook.io/concordialang/development.md).

# Development

- [Creating a Plug-in](https://concordialang.gitbook.io/concordialang/development/creating-a-plug-in.md)
- [Actions vs APIs](https://concordialang.gitbook.io/concordialang/development/actions-vs-apis.md)
- [Language Additions](https://concordialang.gitbook.io/concordialang/development/availability.md): This page tries to identify in which version of the Compiler a certain language construction became available.