Docs
Tallgrass is open source (GPL-3.0; game profiles are CC0). These are the project's own docs, straight from the repository. To use Tallgrass, start with the guide.
Handbook
How Tallgrass fits together, and how to develop, test, release and run every part of it.
Writing a game profile
Add support for a new romhack: profile fields and how to find addresses.
Game data export format
The JSON the agent exports from a ROM, which the game docs on this site read.
Releasing
The release workflow, versions and the signing key.