CCARF Practice Question

Paper 3 · Question 31

D2 Tool Design & MCP Integration · Paper 3

[Scenario 4: Developer Productivity with Claude] You are building developer productivity tooling on the Claude Agent SDK: helping engineers explore unfamiliar codebases, understand legacy systems, generate boilerplate, and automate repetitive tasks — using the built-in tools (Read, Write, Edit, Bash, Grep, Glob) plus MCP servers. The agent must (a) locate every file matching the test naming convention anywhere in the repo, and (b) find every place the string “PaymentDeclinedError” appears in code. Which TWO tool selections are correct? (Select TWO.)

• A.Glob with a pattern like **/*.test.tsx for the test files — file-path pattern matching is Glob's job
• B.Grep with a filename pattern to find the test files
• C.Grep for “PaymentDeclinedError” — searching file contents for a string is Grep's job
• D.Glob for “PaymentDeclinedError” across file contents
• E.Bash running cat on every file, piping through manual inspection

Show answer & explanations

Correct answer: A, C

A: The division of labor is clean: Glob matches file paths against patterns (names, extensions, directories); Grep searches file contents for patterns (identifiers, error strings, imports). Each task maps to exactly one of them.

B: and D swap the tools into each other's territory

C: The division of labor is clean: Glob matches file paths against patterns (names, extensions, directories); Grep searches file contents for patterns (identifiers, error strings, imports). Each task maps to exactly one of them.

D: This option does not best satisfy the scenario requirements.

E: abandons both purpose-built tools for a brute-force pipeline that floods context

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