Anthropic · CCDV-F
Prompt engineering
CCDV-F · Lesson 15 of 21 · 2:19:51
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In this lesson
Prepare for the Claude Certified Developer – Foundations exam, on the exam guide version 1.0, effective July 2026. In this lesson: clear instructions with reasons and constraints, three to five varied examples in tags, XML structure, system prompt versus user message, long documents first, where each instruction belongs (tool descriptions, CLAUDE.md, skills, hooks), and iterating against test cases. Includes three original practice questions.
Preview the topics
- Driftwood’s prompt says to keep listing summaries short, and the summaries range from one line to a full page. What should change?
- Driftwood’s main agent asks a subagent to “review the change we discussed”, and the subagent reviews the wrong files. What should change?
- Driftwood’s team edits its prompt every day after one or two complaints, and the quality goes up and down from week to week. What should change?