Software engineer in Sofia, Bulgaria. I build agent systems, MCP servers and Claude Code workflows for a living, and I am preparing for the Claude Certified Architect Foundations exam myself. I wrote these mocks from the official exam guide because the official practice exam was retired and the free sets I found described the exam format wrongly. Every question explains all four options and names the task statement it tests, so you can check me against the guide. Not affiliated with Anthropic.