The goal of tibia-capi is to produce C header files which define the functions addresses and memory layout of the Tibia client.

These can be used to compile a shared library that calls the native Tibia functions. As a proof of concept, I have written a library to automatically log into the game on startup. To load it into Tibia's address space, use LD_PRELOAD

make
LD_PRELOAD=/path/to/tibia-hook.so ./Tibia

It's as simple as that