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Hardest Claude Certified Developer - Foundations questions this week

These are the public diagnostic questions people are missing most often. Use the list as a weekly study loop: review the concept, then retake the diagnostic.

Weekly review loop

  1. Step 1Start with the most-missed topic and read the short answer explanation.
  2. Step 2Open the full breakdown for the concept before moving to the next topic.
  3. Step 3Retake the diagnostic and email the score report if you want the study plan.
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questions to review
Live weekly data is still filling in, so this page is showing the current high-signal review set.

Weekly report

Send the current weak-area list to yourself, then use the links as a study queue before your next diagnostic attempt.

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#1 most missed

Agents & Workflows

Agents and Workflows
Review
high-signal topic

A document pipeline always performs the same three steps: extract fields, validate them against a schema, and write an approved record. Which design is the best default?

Correct answer
D. A deterministic workflow that calls Claude only for the extraction step and uses code for validation and writing

The sequence and control logic are known, so deterministic orchestration is simpler and safer. Claude can handle the ambiguous extraction while code enforces schema and write rules.

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#2 most missed

Messages API & Conversation

Applications and Integration
Review
high-signal topic

A developer expects the Messages API to remember a user's previous request, but the second call has no context. What is the correct fix?

Correct answer
C. Send the relevant prior user and assistant turns again in the messages array

Messages API calls are stateless with respect to conversation history. The application owns state and must include the relevant prior turns in each request.

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#3 most missed

Claude Code & Instructions

Claude Code
Review
high-signal topic

A repository has build commands and coding conventions that every Claude Code session should follow. Where should the team place them?

Correct answer
B. In a concise repository CLAUDE.md committed with the project

A repository CLAUDE.md provides versioned, shared project instructions. It should stay concise and point to deeper documentation where needed.

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