{
	"$schema": "https://json-schema.org/draft/2020-12/schema",
	"$id": "https://ultimate-pi.local/.pi/harness/specs/plan-decomposition-brief.schema.json",
	"title": "PlanDecompositionBrief",
	"description": "DeepMind-style problem decomposition (harness plan phase 1).",
	"type": "object",
	"additionalProperties": false,
	"required": [
		"schema_version",
		"problem_restatement",
		"problem_types",
		"scope",
		"hard_constraints",
		"soft_constraints",
		"success_metrics",
		"prior_art",
		"tensions",
		"core_tension"
	],
	"properties": {
		"schema_version": {
			"type": "string",
			"const": "1.0.0"
		},
		"problem_restatement": {
			"type": "string",
			"minLength": 1,
			"description": "Precise restatement; what solving this looks like."
		},
		"problem_types": {
			"type": "array",
			"minItems": 1,
			"items": {
				"type": "string",
				"enum": [
					"optimization",
					"discovery",
					"explanation",
					"design",
					"selection"
				]
			}
		},
		"scope": {
			"type": "object",
			"additionalProperties": false,
			"required": ["narrowed_focus", "excluded"],
			"properties": {
				"narrowed_focus": {
					"type": "string",
					"minLength": 1
				},
				"excluded": {
					"type": "array",
					"items": { "type": "string", "minLength": 1 }
				}
			}
		},
		"hard_constraints": {
			"type": "array",
			"items": { "type": "string", "minLength": 1 }
		},
		"soft_constraints": {
			"type": "array",
			"items": { "type": "string", "minLength": 1 }
		},
		"success_metrics": {
			"type": "array",
			"minItems": 1,
			"items": { "type": "string", "minLength": 1 }
		},
		"prior_art": {
			"type": "object",
			"additionalProperties": false,
			"required": ["best_approach", "gap", "dead_ends"],
			"properties": {
				"best_approach": { "type": "string", "minLength": 1 },
				"gap": { "type": "string", "minLength": 1 },
				"dead_ends": {
					"type": "array",
					"items": { "type": "string", "minLength": 1 }
				}
			}
		},
		"tensions": {
			"type": "array",
			"minItems": 1,
			"items": {
				"type": "object",
				"additionalProperties": false,
				"required": ["claim_a", "claim_b", "why_matters"],
				"properties": {
					"claim_a": { "type": "string", "minLength": 1 },
					"claim_b": { "type": "string", "minLength": 1 },
					"why_matters": { "type": "string", "minLength": 1 }
				}
			}
		},
		"core_tension": {
			"type": "string",
			"minLength": 1,
			"description": "One paragraph summarizing the tension that feeds hypothesis generation."
		},
		"human_summary": {
			"type": "string"
		}
	}
}