Optional metadata attached to a defineFn registration. Surfaced via describe() and the MCP tool catalog so agents see what each fn does and what arguments it expects without reading the source.
defineFn
describe()
Optional
Human-readable description of what the fn does.
Optional usage examples.
Free-form input schema (typically JSON Schema).
Free-form output schema (typically JSON Schema).
Optional metadata attached to a
defineFnregistration. Surfaced viadescribe()and the MCP tool catalog so agents see what each fn does and what arguments it expects without reading the source.