What a test is and why you need one
"Tests passed" sounds like a guarantee, but it only means the checks that exist did their job. We look at where manual checking ends and automated testing begins, how to describe a scenario in words before any code, and what pass, fail and skipped really stand for.
What turns a model into an agent
Switch models with /model, and CLAUDE.md, permission prompts and hooks all behave exactly as before. We look at what the model itself does in Claude Code, what the harness around it handles, and where to look when the agent keeps making the same mistake.
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