CCARF Practice Question

Paper 3 · Question 57

D2 Tool Design & MCP Integration · Paper 3

[Scenario 6: Structured Data Extraction] You are building a structured data extraction system: pulling information from unstructured documents, validating output against JSON schemas, handling edge cases gracefully, and integrating with downstream systems. A single analyze_document tool handles extraction, summarization, and claim verification, chosen by a mode parameter. The agent regularly picks the wrong mode and results are inconsistent. What is the recommended redesign?

• A.Add a fourth mode that automatically detects the right mode
• B.Document the modes more thoroughly inside the one description
• C.Reduce to two modes by merging extraction into summarization
• D.Split the generic tool into purpose-specific tools — extract_data_points, summarize_content, verify_claim_against_source — each with a defined input/output contract

Show answer & explanations

Correct answer: D

A: buries the selection problem one layer deeper

B: improves documentation of a structure that remains ambiguous

C: reduces options while keeping the overloaded design

D: Purpose-specific tools turn a hidden mode decision into a visible selection decision — the thing tool descriptions are good at guiding. Each tool's contract is explicit, and misrouting drops accordingly.

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