Blog
Mert Özen's blog posts on software development, backend, frontend, and DevOps.
Copilot CLI: An Agent in the Terminal, Plan Mode, Sandboxing, Automation with `copilot -p` and ACP
copilot -p can exit with 0 while the answer is wrong: in Bookstore both runs with a local model returned 0, one printing a useless JSON fragment, the other bullets that are not in the commit. Installation, plan mode, --allow-tool and --deny-tool rules, sandboxing and --cloud, GitHub Actions with GITHUB_TOKEN and copilot-requests, the permission actionlint does not know, BYOK and an ACP client.
Getting Started with GitHub Copilot: Plans, AI Credits, Surfaces (VS 2026, VS Code, Rider, GitHub.com, CLI) and Model Choice
In Copilot, agent sessions spend your credits, not inline suggestions: since 1 June 2026 billing uses token-based GitHub AI Credits, and a thirty-step session costs between 4 and 128 credits depending on the model. Plans, base and flex credits, auto and Copilot Fusion, setting up Visual Studio 2026, VS Code, GitHub.com and the CLI, and organization policies.