Why is it that sometimes you have to manually install the Nav Mesh Agent using a Git URL in Unity?

Question

Why did I encounter the need to manually install the Nav Mesh Agent using a Git URL in Unity while working on my horror game project? Initially, I couldn't find the option to add it to the module, and it wasn't until later that I discovered I could do so via a GitHub link. What might have caused this unusual behavior, and how does this workaround function?

https://github.com/Unity-Technologies/NavMeshComponents

I attempted to create a Nav Mesh Agent. I expected that I would be able to add the Nav Mesh Agent to the project module in a straightforward manner, just as I had done with other assets and components. However, I was initially unable to find the option to add the Nav Mesh Agent as I expected. It was only after some troubleshooting that I realized I could manually install it using a GitHub link.

Answer 1

You need to install the AI Navigation package using the Package Manager if you have newer Unity versions as AI content is no longer included by default.

Edit: added some references

Here is the announcement.

Here is the documentation. (notice the version combo list which is also Unity-version dependent)

Here is the API reference. (notice the version combo list which is also Unity-version dependent)