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HomeClaude Certified Architect - Foundations (CCAR-F)Domain 2: Tool Design & MCP Integration
Domain roadmap157 words

Domain 2: Tool Design & MCP Integration

Claude Certified Architect - Foundations (CCAR-F) › Domain 2: Tool Design & MCP Integration

Domain 2: Tool Design & MCP Integration

Domain 2 rests on one premise that explains most of its answers: the description is the interface. Tool selection runs on what the descriptions say, so two tools that sound alike get chosen between at close to chance, a constraint left out of a description is a constraint the model cannot respect, and a capable tool that describes itself vaguely loses to a built-in that does not. The second premise is that errors are data: an agent can only recover as well as the error told it what happened.

Domain 2 at a glance

Blueprint weight
18% of scored items
Task statements
5
Questions in this hive
46
Flashcards in this hive
43, one per published objective

What the guide measures here

  1. Design effective tool interfaces with clear descriptions and boundaries
  2. Implement structured error responses for MCP tools
  3. Distribute tools appropriately across agents and configure tool choice
  4. Integrate MCP servers into Claude Code and agent workflows
  5. Select and apply built-in tools (Read, Write, Edit, Bash, Grep, Glob) effectively

The order to learn them in

Working through Domain 2

  1. 1

    Tool descriptions

    Begin with tool descriptions — what belongs in one, and what overlap does. This is the domain's centre of gravity and the source of its most-repeated fact.

Where Domain 2 catches people

Fixing a selection problem in the system prompt when the descriptions are the cause — or the reverse, polishing descriptions when a keyword in the system prompt is overriding them. Retrying an error that was never retryable. Treating an empty result as a failure. And giving one agent every tool because it might need them, which is the specific thing that degrades selection.

Read the tool count

When a stem tells you how many tools an agent holds, that number is usually the answer. Eighteen where four or five would do is not background detail — it is the defect the question is about.

What is quoted, and what is argued

The weight and the 5 task statement titles above are quoted from the official CCAR-F exam guide v1.0. The thesis, sequence and traps are this hive's reading of that material — useful, and not the guide's own words. Asset counts are this hive's, read from the bank on 2026-08-29.

All Claude Certified Architect - Foundations (CCAR-F) Study Resources

Related Notes

  • CCAR-F: how the exam is dealt194 words
  • Scenario 1: Customer Support Resolution Agent225 words
  • Scenario 2: Code Generation with Claude Code185 words
  • Scenario 3: Multi-Agent Research System199 words
  • Scenario 4: Developer Productivity with Claude197 words
  • Scenario 5: Claude Code for Continuous Integration168 words
  • Scenario 6: Structured Data Extraction185 words
  • Domain 1: Agentic Architecture & Orchestration169 words
  • Domain 3: Claude Code Configuration & Workflows150 words
  • Domain 4: Prompt Engineering & Structured Output150 words
  • Domain 5: Context Management & Reliability165 words

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