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Can Claude call multiple tools in a single response?

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Parallel Tool Calling

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A developer defines two tools: 'search_database' and 'send_email'. The model calls both in the same response. The email is sent with outdated data because search results aren't available yet. What's wrong?

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An application has 10 independent tools that can run in parallel. Each takes ~2 seconds. Using parallel calling reduces total time from 20s to ~2s. What's the limiting factor for scaling to 100 tools?

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