[{"name":"endpoint_name","label":"Endpoint name","value_type":"text","required":true,"purpose":"Stable human-readable label for the scientific endpoint.","boundary":"A label identifies the endpoint but does not define its scientific meaning by itself."},{"name":"scientific_quantity","label":"Scientific quantity","value_type":"textarea","required":true,"purpose":"Plain-language statement of the quantity every valid specification must estimate.","boundary":"If this quantity changes across branches, the branches do not belong in one common-endpoint robustness summary."},{"name":"unit","label":"Unit or scale","value_type":"text","required":true,"purpose":"Unit or dimensionless scale of the returned scalar estimate.","boundary":"Units must be consistent across branches; software does not infer or convert scientific units."},{"name":"contrast_direction","label":"Contrast / direction","value_type":"textarea","required":true,"purpose":"Define subtraction order, comparison direction, reference category, or sign convention where relevant.","boundary":"Reversing a contrast changes sign and can change the scientific interpretation even when the absolute magnitude is unchanged."},{"name":"analysis_unit","label":"Analysis unit and aggregation","value_type":"textarea","required":true,"purpose":"State whether the scalar is built from samples, fixations/events, trials, participants, condition means, or another aggregation.","boundary":"Changing weighting or aggregation can change the estimand even when variable names remain unchanged."},{"name":"population_denominator","label":"Population / denominator","value_type":"textarea","required":true,"purpose":"Define which observations or units are eligible to contribute to the endpoint before specification-specific processing.","boundary":"Silent denominator changes make across-specification estimates non-comparable."},{"name":"missingness_policy","label":"Missing / unavailable endpoint inputs","value_type":"textarea","required":true,"purpose":"State how missing or unavailable inputs are represented before the endpoint calculation.","boundary":"Missing values must not be silently converted to zero or removed without the declared rule."},{"name":"nonfinite_policy","label":"Non-finite endpoint policy","value_type":"textarea","required":true,"purpose":"State whether NaN or infinity is considered an endpoint-contract failure and how that failure remains visible.","boundary":"run_specs() float-coerces endpoint outputs but does not itself reject NaN or infinity."},{"name":"transformation","label":"Transformation / scaling","value_type":"textarea","required":false,"purpose":"Record log transforms, normalization, standardization, rate conversion, or other transformations applied to the endpoint.","boundary":"A transformation changes the numerical scale and must remain consistent across branches being compared."},{"name":"scientific_null","label":"Scientific null / reference value","value_type":"text","required":false,"purpose":"Record the null or reference value when direction or recovery is interpreted relative to one.","boundary":"GazeAudit does not infer the scientifically meaningful null from the observed estimates."},{"name":"required_inputs","label":"Required input fields / objects","value_type":"textarea","required":true,"purpose":"List the processed columns, events, probabilities, durations, conditions, or model outputs the endpoint requires.","boundary":"A branch missing a required input is an execution/evidence problem, not permission to substitute another endpoint."},{"name":"interpretation_boundary","label":"Interpretation boundary","value_type":"textarea","required":true,"purpose":"State what the endpoint does not measure and which broader claims it cannot support on its own.","boundary":"Endpoint clarity constrains interpretation but does not establish construct validity."}]