{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "sots-contract/1",
  "type": "object",
  "additionalProperties": false,
  "required": ["id", "title", "status", "owner", "baseline", "scope", "inputs", "effects", "original_dependencies", "dependencies", "acceptance", "predictions", "stop_conditions", "checkpoint"],
  "properties": {
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    "title": {"type": "string", "minLength": 1, "maxLength": 240},
    "status": {"enum": ["proposed", "ready", "implementing", "verification", "integration", "accepted", "blocked", "needs-revision"]},
    "owner": {"type": "object", "additionalProperties": false, "required": ["name", "role"], "properties": {"name": {"type": "string", "minLength": 1, "maxLength": 120}, "role": {"enum": ["lead", "resolver", "architecture-review", "analyst", "implementer", "verifier", "lab"]}}},
    "baseline": {"$ref": "#/$defs/baseline"},
    "scope": {"$ref": "#/$defs/strings"},
    "inputs": {"$ref": "#/$defs/strings"},
    "effects": {"$ref": "#/$defs/strings"},
    "original_dependencies": {"$ref": "#/$defs/strings"},
    "dependencies": {"type": "array", "uniqueItems": true, "items": {"type": "string", "pattern": "^[a-z0-9][a-z0-9-]{0,79}$"}},
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    "predictions": {"$ref": "#/$defs/strings"},
    "stop_conditions": {"$ref": "#/$defs/strings"},
    "checkpoint": {"type": ["string", "null"], "pattern": "^campaign/runtime/checkpoints/[a-zA-Z0-9_.-]+\\.json$"},
    "evidence": {"type": "array", "items": {"$ref": "#/$defs/evidence"}}
  },
  "$defs": {
    "strings": {"type": "array", "uniqueItems": true, "items": {"type": "string", "minLength": 1, "maxLength": 2000}},
    "repository": {"type": "object", "additionalProperties": false, "required": ["path", "commit"], "properties": {"path": {"type": "string", "pattern": "^/"}, "commit": {"type": "string", "pattern": "^[0-9a-f]{40}([0-9a-f]{24})?$"}}},
    "baseline": {"type": "object", "additionalProperties": false, "required": ["engine", "re"], "properties": {"engine": {"$ref": "#/$defs/repository"}, "re": {"$ref": "#/$defs/repository"}}},
    "artifact": {"type": "object", "additionalProperties": false, "required": ["path", "sha256"], "properties": {"path": {"type": "string", "minLength": 1}, "sha256": {"type": "string", "pattern": "^[0-9a-f]{64}$"}}},
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    "sourceBinding": {"type": "object", "additionalProperties": false, "required": ["engine", "re"], "properties": {"engine": {"$ref": "#/$defs/sourceTree"}, "re": {"$ref": "#/$defs/sourceTree"}}},
    "evidence": {"type": "object", "additionalProperties": false, "required": ["id", "axis", "path", "sha256", "source", "integrated", "source_binding", "binaries", "inputs", "outcomes"], "properties": {
      "id": {"type": "string", "minLength": 1}, "axis": {"type": "string", "minLength": 1},
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      "source": {"$ref": "#/$defs/baseline"}, "integrated": {"type": "boolean"},
      "source_binding": {"$ref": "#/$defs/sourceBinding"},
      "binaries": {"type": "array", "uniqueItems": true, "items": {"$ref": "#/$defs/artifact"}},
      "inputs": {"type": "array", "uniqueItems": true, "items": {"$ref": "#/$defs/artifact"}},
      "outcomes": {"type": "array", "items": {"type": "object", "additionalProperties": false, "required": ["criterion", "status", "artifact"], "properties": {"criterion": {"type": "string", "minLength": 1}, "status": {"enum": ["pass", "fail", "blocked"]}, "artifact": {"$ref": "#/$defs/artifact"}}}}
    }}
  }
}