Domain 1 – Agents and Workflows (14.7%)

3 lessons, each ending with a practice scenario

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1. ✓1.1 — Agent ArchitectureEvery agentic system starts from one decision: who owns the control flow. The Three Tiers: Augmented LLM, Workflow, Agent; The dividing line: whoever decides the next step names the tier. A hand-coded three-step chain is a workflow; a model choosing its own tool sequence is an agent.
2. ✓1.2 — Agent Construction with ClaudeAn agent is a model calling tools in a loop. The harness is the code that runs the loop. A turn is one round trip. A hook is harness code that runs at a fixed point.
3. ✓1.3 — Agent Patterns and FrameworksAn agent remembers nothing between sessions unless the design adds a mechanism. Anthropic’s memory tool (memory20250818) gives create/read/update/delete over files in /memories. Your application executes each operation client-side. Safeguards live in your handler (reject path traversal, track file sizes, cap view returns).