Hyrule is open to contributions generally. It's intended to grow with the needs of Hy programmers. The primary criteria for adding a feature to Hyrule are:
- It's not redundant with preexisting Python libraries.
- It's of general interest to Hy programmers. In other words, it's not extremely specialized. Specialized code should go into a specialized library instead.
- It takes at most an entire new file to implement. If your feature spans multiple files, it should probably have its own library instead.
Other than that, Hyrule's contribution guidelines and core development team are shared with Hy itself.