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Hardest Claude Certified Architect - 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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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

Architecture & Workflow

Agentic Architecture and Orchestration
Review
high-signal topic

A claims process has a fixed sequence and each transition must be auditable: intake, extraction, rule validation, human approval, and payment. Which architecture best fits?

Correct answer
D. A deterministic state machine that uses Claude for ambiguous extraction and explanation while code enforces transitions and approval

The process has known stages and high-impact transitions. Deterministic orchestration creates auditability while reserving model judgment for the genuinely ambiguous steps.

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#2 most missed

Tool Design & Schema

Tool Design and MCP Integration
Review
high-signal topic

A tool named `manage_account` accepts a free-form action string and a large untyped payload. Claude frequently forms unsafe calls. What redesign is best?

Correct answer
C. Split it into narrow intent-revealing tools with typed parameters, validation, and explicit error contracts

Narrow tools reduce ambiguity and make authorization and validation specific to each operation. A broad free-form mutation surface is difficult to reason about safely.

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#3 most missed

Claude Code & Hierarchy

Claude Code Configuration and Workflows
Review
high-signal topic

A monorepo has organization-wide security rules and service-specific test commands. How should Claude Code instructions be structured?

Correct answer
B. Keep universal rules at the repository level and place service-specific guidance near each service, avoiding duplication and conflicts

Layered instructions mirror scope. Universal guidance remains visible while local files keep service context relevant and maintainable.

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