My guess is most of it? This commit message for example sounds very much like a Claude result:

    Add Space Invaders game implementation in assembly language
    - Implemented the core game logic including player movement, missile firing, and invader behavior.
    - Added collision detection for missiles and bombs.
    - Included game state management for win/lose conditions and restarting the game.
    - Created functions for drawing game elements on the screen and handling keyboard input.
    - Defined constants and variables for game configuration and state tracking.

That last one in particular is exactly the kind of update you get from claude, it doesn't sound very human. "Constants and variables" eh? Not just constants or variables, but constants and variables.

Helpful, but not. Detailed, but not.

rule #1 of ai programming: read and approve everything before accept. rule #2 do not let it write commit messages - i did not know notice that until many commits later. they are horrible. change 10 things - writes about the last one, too peppy too.

95% of it. It's a power tool.