Defining Tools

Define tools Claude actually picks reliably. Learn the tools array shape, JSON Schema for input_schema, name and description discipline (Claude reads descriptions to decide whether to call), required vs optional parameters, the linting practice that prevents flaky tool selection, and the eval pattern for tool-call accuracy.

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Lessons in This Topic

Work through these 6 lessons in order, or jump to whichever is most relevant.

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Defining Tools Overview

Advanced
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Tools Array Shape

Advanced
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JSON Schema for Input

Advanced
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Name & Description Discipline

Advanced
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Required vs Optional Parameters

Advanced
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Tool-Call Accuracy Eval

Advanced