CCA-F: Claude Certified Architect — Foundations

By Anthropic · Question Mode

QuestionQ99

Tool Design & MCP Integration

You are creating a structured-data extraction system with Claude. The system extracts information from unstructured documents, validates its output with JavaScript Object Notation (JSON) schemas, and preserves high accuracy. It must gracefully handle edge cases and integrate with downstream systems.

Your pipeline uses a tool named extract_metadata with a JSON schema for paper details. You have also defined lookup_citations and verify_doi tools for enrichment. During testing, you observe that when users make requests such as “extract the metadata and tell me how cited it is,” Claude sometimes calls lookup_citations first, which fails because it requires the DOI that extract_metadata would supply.

What is the most effective way to ensure structured metadata extraction occurs first?

Explanation

A forced named tool choice guarantees that extract_metadata is called for the extraction request. After its tool result provides the DOI, a subsequent turn can perform citation lookup or DOI verification with the required input. A named tool_choice applies to its individual API request, while auto permits Claude to choose and any requires only some tool, not the extraction tool. Anthropic’s tool-use documentation states that tool forces a particular tool, whereas auto and any do not force a particular one.

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