How do i reanimate or edit animations of npcs

[claau.sgv]

i know how to edit animations for first person animation in hl2 retail but i dont know how to change the animations of citizens pls help

[GeorgeTheGasmaskCitizen]

As far as I'm aware the process is similar to retail HL2 but not the same.
You need to decompile the model using Crowbar or a HL2BETA-specific mdl-decompiler.

Then you can import the SMDs into an animation tool like Blender, and add a sequence with said animation to the QC generated by crowbar when decompiling.

As for compiling the model after all of that, please see this thread on this forum, it should help.