There seems to be a difference between a normal GitHub Copilot subscription and a Enterprise subscription. I have a Enterprise subscription and the above describes configuration (or described in tgis youtube video: https://youtu.be/pStlnyBl3Rg?t=163) does not work for me. I had to do the workaround of @instanceof from above with the wrapper script. Looks like the Environment variables are likely >the problem. When Xcode runs the >Executable, it may not have all the >environment setup that it needs. I created a wrapper script with execute bits >set that sets up the environment and then just >calls copilot and that seems to work. Set the >Xcode Agent config to path to the script. It >would probably also work to add Environment >Variables to the Xcode Agent setup as well. ~/bin/xcode-copilot-agent: #!/bin/zsh -i copilot --acp Maybe the Apple engineers could have a second look here.