CCARF Practice Question

Paper 3 · Question 8

D2 Tool Design & MCP Integration · Paper 3

[Scenario 1: Customer Support Resolution Agent] You are building a customer support resolution agent with the Claude Agent SDK. It handles high-ambiguity requests (returns, billing disputes, account issues) via custom MCP tools — get_customer, lookup_order, process_refund, escalate_to_human — targeting 80%+ first-contact resolution while knowing when to escalate. The agent frequently confuses get_customer and lookup_order; both currently carry one-line descriptions. Which TWO description changes most directly fix the misrouting? (Select TWO.)

• A.Make both descriptions shorter so there is less to confuse
• B.Document each tool's expected input formats and add example queries it should handle
• C.Prefix both descriptions with “IMPORTANT:” for emphasis
• D.Add boundary language differentiating the two — e.g., “use lookup_order when an order number is present; use get_customer to verify identity before account operations”
• E.Rely on the tool names alone, since names are what models read

Show answer & explanations

Correct answer: B, D

A: removes information from tools that already have too little

B: Descriptions are the primary selection mechanism. Input formats plus example queries show each tool's territory; explicit boundary language resolves precisely the overlap causing the misrouting.

C: adds emphasis without discrimination

D: Descriptions are the primary selection mechanism. Input formats plus example queries show each tool's territory; explicit boundary language resolves precisely the overlap causing the misrouting.

E: is false — names help, but descriptions carry the selection signal

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