> Curious to try this against the Github (website) Agent. The website Agent is definitely dumber than the vscode agent (because it has to spend 20 minutes figuring out how to build and start my monorepo apps) but on the flip side, it doesn't take up my computer and thus any value it creates is additive.

Yeah that's on you. Add a `copilot-instructions.md` file and configure the `copilot-setup-steps.yml` workflow to setup your environment. Both are supported more or less since Copilot Agent got released (though in "preview")

Most agents read `AGENTS.md`, I just symlink it to CLAUDE.md, and do the same for GEMINI.md