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Claude Tool Use: Design Patterns and Production Lessons (ANSWERED)

Project BasedClaudeMedium14 min read

TL;DR — Quick Answer

Claude tool use returns structured tool_use blocks in messages; you execute tools and return tool_result — similar loop to OpenAI but with Claude-specific caching, parallel tools, and XML-legacy patterns; enforce same validation and security as any agent tools.

The Interview Question

Explain Anthropic Claude tool use API. How does it compare to OpenAI function calling in agent loops?

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