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Writing tool descriptions that make selection reliable

The description is the mechanism a model uses to pick a tool, so a thin one is the root cause of misrouting between similar tools. Learn what a description must carry, how a system prompt can override it, and the order to apply fixes in.

15 min readintermediate

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This lesson is part of Domain 2: Tool design and MCP integration, which a free account opens. The orientation module of every course reads without one.

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