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local stratified cohort planning from materialized traces #480

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180 changes: 180 additions & 0 deletions schemas/understudy.eval-cohort-strata-plan.v1.schema.json
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{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"$id": "https://understudylabs.com/schemas/understudy.eval-cohort-strata-plan.v1.schema.json",
"title": "understudy.eval-cohort-strata-plan.v1",
"description": "Local, metadata-only stratified cohort plan derived from materialized trace artifacts (issue #281 phase 1). Contains execution ids, stratum labels, and counts only — never payload-derived fields.",
"type": "object",
"additionalProperties": false,
"required": [
"schema_version", "created_at", "seed", "inputs", "config", "pool",
"strata", "selection", "coverage", "ready", "blocking", "expansion_of",
"stability", "privacy"
],
"properties": {
"schema_version": { "const": "understudy.eval-cohort-strata-plan.v1" },
"created_at": { "$ref": "#/$defs/timestamp" },
"seed": { "$ref": "#/$defs/nonempty" },
"inputs": {
"type": "object",
"additionalProperties": false,
"required": ["execution_index", "execution_index_sha256", "tasks"],
"properties": {
"execution_index": { "$ref": "#/$defs/nonempty" },
"execution_index_sha256": { "$ref": "#/$defs/sha" },
"tasks": { "oneOf": [{ "$ref": "#/$defs/nonempty" }, { "type": "null" }] }
}
},
"config": {
"type": "object",
"additionalProperties": false,
"required": ["axes", "target_per_stratum", "rare_threshold", "high_consequence_tags"],
"properties": {
"axes": {
"type": "array",
"minItems": 1,
"uniqueItems": true,
"items": { "enum": ["outcome", "mode", "turns", "confidence", "tag"] }
},
"target_per_stratum": { "type": "integer", "minimum": 1 },
"rare_threshold": { "type": "integer", "minimum": 0 },
"high_consequence_tags": { "type": "array", "items": { "$ref": "#/$defs/nonempty" } }
}
},
"pool": {
"type": "object",
"additionalProperties": false,
"required": ["index_rows", "eligible", "excluded"],
"properties": {
"index_rows": { "$ref": "#/$defs/count" },
"eligible": { "$ref": "#/$defs/count" },
"excluded": {
"type": "array",
"items": {
"type": "object",
"additionalProperties": false,
"required": ["reason", "count"],
"properties": {
"reason": {
"enum": [
"source_excluded", "missing_execution_group", "lineage_ambiguous",
"lineage_unlinked", "missing_task", "duplicate_execution_group"
]
},
"count": { "$ref": "#/$defs/count" }
}
}
}
}
},
"strata": {
"type": "array",
"items": {
"type": "object",
"additionalProperties": false,
"required": ["axis", "value", "available", "target", "selected", "rule"],
"properties": {
"axis": { "enum": ["outcome", "mode", "turns", "confidence", "tag"] },
"value": { "$ref": "#/$defs/nonempty" },
"available": { "$ref": "#/$defs/count" },
"target": { "type": "integer", "minimum": 1 },
"selected": { "$ref": "#/$defs/count" },
"rule": {
"enum": [
"saturated_rare", "saturated_high_consequence", "saturated",
"sampled", "uncovered"
]
}
}
}
},
"selection": {
"type": "array",
"items": {
"type": "object",
"additionalProperties": false,
"required": ["execution_group", "task_id", "strata", "frozen"],
"properties": {
"execution_group": { "$ref": "#/$defs/nonempty" },
"task_id": { "$ref": "#/$defs/nonempty" },
"strata": { "type": "array", "items": { "$ref": "#/$defs/nonempty" } },
"frozen": { "type": "boolean" }
}
}
},
"coverage": {
"type": "object",
"additionalProperties": false,
"required": ["uncovered_strata", "underfilled_strata"],
"properties": {
"uncovered_strata": {
"type": "array",
"items": {
"type": "object",
"additionalProperties": false,
"required": ["axis", "value"],
"properties": {
"axis": { "enum": ["outcome", "mode", "turns", "confidence", "tag"] },
"value": { "$ref": "#/$defs/nonempty" }
}
}
},
"underfilled_strata": {
"type": "array",
"items": {
"type": "object",
"additionalProperties": false,
"required": ["axis", "value", "available", "target"],
"properties": {
"axis": { "enum": ["outcome", "mode", "turns", "confidence", "tag"] },
"value": { "$ref": "#/$defs/nonempty" },
"available": { "$ref": "#/$defs/count" },
"target": { "type": "integer", "minimum": 1 }
}
}
}
}
},
"ready": { "type": "boolean" },
"blocking": { "type": "array", "items": { "$ref": "#/$defs/nonempty" } },
"expansion_of": { "oneOf": [{ "$ref": "#/$defs/sha" }, { "type": "null" }] },
"stability": {
"type": "object",
"additionalProperties": false,
"required": ["status", "tolerance", "moved"],
"properties": {
"status": { "enum": ["not_applicable", "stable", "unstable"] },
"tolerance": { "type": "number", "minimum": 0 },
"moved": {
"type": "array",
"items": {
"type": "object",
"additionalProperties": false,
"required": ["axis", "value", "before", "after"],
"properties": {
"axis": { "enum": ["outcome", "mode", "turns", "confidence", "tag"] },
"value": { "$ref": "#/$defs/nonempty" },
"before": { "type": "number" },
"after": { "type": "number" }
}
}
}
}
},
"privacy": {
"type": "object",
"additionalProperties": false,
"required": ["local_only", "payload_fields_read", "upload_performed"],
"properties": {
"local_only": { "const": true },
"payload_fields_read": { "const": false },
"upload_performed": { "const": false }
}
}
},
"$defs": {
"nonempty": { "type": "string", "minLength": 1 },
"sha": { "type": "string", "pattern": "^[a-f0-9]{64}$" },
"count": { "type": "integer", "minimum": 0 },
"timestamp": { "type": "string", "format": "date-time" }
}
}
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