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

# Allusion

[Allusion](https://www.github.com/omalab/allusion) is our URL parser. When given a URL, Allusion will parse it and return a hash that states its type, and includes labeled items from the URL, including the username, post id, user\_id, service, etc.