Certification
    June 18, 2026

    CCA Exam Drills — Strategy & the 3 Rules

    The three decision rules that resolve most Claude Certified Architect scenario questions: deterministic-over-probabilistic, root-cause, and simplest-fix.

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    The CCA exam is scenario-based: every question hands you a situation and four plausible-sounding fixes, and asks for the best one. You rarely need to recall a parameter — you need to apply judgement consistently. This course drills that judgement.

    NOTE

    Format: 60 multiple-choice questions · 120 minutes · pass at 720/1000. Five domains, weighted 27% / 18% / 20% / 20% / 15% (Agentic Architecture is the heaviest — drill it first). This is independent prep built on the public blueprint; it reproduces no confidential exam content.

    The 3 rules that answer ~80% of questions

    When two options look right, the one that honours these rules wins.

    TIP

    Rule 1 — Deterministic over probabilistic when stakes are high. Financial, compliance, identity, and security operations must use hooks, schemas, or forced tool_choice — never a prompt instruction. "Add an instruction to always verify identity before a refund" sounds right and is wrong: a prompt is followed ~99% of the time, and 1% of a refund flow is unacceptable. The answer is a PreToolUse hook.

    TIP

    Rule 2 — Root cause over symptom patch. Tool mis-routing → fix the tool description, not a routing layer. Narrow multi-agent results → fix the coordinator's decomposition, not the subagents. Hallucinated/absent fields → fix the schema (nullable), not the retry loop.

    TIP

    Rule 3 — Simplest correct intervention. Don't over-engineer and don't stack complexity on a broken architecture. If "improve descriptions" and "add a classifier layer + few-shot + a new agent" both appear, the minimal fix that addresses the real root cause is the answer.

    How to read a scenario question

    1. Identify the symptom vs the root cause. The question describes a symptom; three options patch the symptom, one fixes the cause.
    2. Spot the stakes. If the scenario is financial/compliance/security, eliminate every "add a prompt instruction" option immediately (Rule 1).
    3. Eliminate over-engineering. Cross out answers that add layers, services, or agents where a one-line fix exists (Rule 3).
    4. Prefer the structural fix. Schema/hook/description/coordinator changes beat "tell the model to try harder."
    WARNING

    Distractors are engineered from a fixed set of 22 anti-patterns. If an option is one of them, it's wrong — regardless of how reasonable it sounds. The next lesson is that anti-pattern bank.

    How to use this course

    Pair this with the conceptual depth in the CCA Foundations course.

    Ask about this article

    Get answers grounded in this post. AI-generated — based on this article, and may be imperfect.

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