The interface
public interface Tool {
String name();
String description();
Schema schema();
Object call(Map args);
boolean isIdempotent();
} Advertisement
name — LLM-facing identifier
Snake_case, verb-first. The model sees this when deciding what to call. Bad names → bad decisions.
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description — how the model chooses
One sentence. What the tool does + when to use it. This is prompt-engineering, not documentation.