{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://api.optimizely.com/schemas/optimizely/experiment.json",
  "title": "Optimizely Experiment",
  "description": "Schema representing an A/B test experiment in Optimizely, including variations, metrics, audience targeting, and traffic allocation configuration.",
  "type": "object",
  "required": ["project_id", "name"],
  "properties": {
    "id": {
      "type": "integer",
      "description": "Unique identifier for the experiment"
    },
    "project_id": {
      "type": "integer",
      "description": "The project this experiment belongs to"
    },
    "name": {
      "type": "string",
      "description": "Human-readable name of the experiment",
      "minLength": 1,
      "maxLength": 255
    },
    "description": {
      "type": "string",
      "description": "Description of the experiment purpose and hypothesis",
      "maxLength": 2000
    },
    "status": {
      "type": "string",
      "description": "Current lifecycle status of the experiment",
      "enum": ["active", "paused", "not_started", "archived"]
    },
    "type": {
      "type": "string",
      "description": "Type of experiment design",
      "enum": ["a/b", "multiarmed_bandit", "multivariate"]
    },
    "holdback": {
      "type": "integer",
      "description": "Percentage of traffic held back from the experiment, expressed in basis points (0-10000)",
      "minimum": 0,
      "maximum": 10000
    },
    "variations": {
      "type": "array",
      "description": "List of variations presented to visitors in the experiment",
      "items": {
        "$ref": "#/$defs/Variation"
      },
      "minItems": 2
    },
    "metrics": {
      "type": "array",
      "description": "List of metrics used to measure experiment results",
      "items": {
        "$ref": "#/$defs/Metric"
      }
    },
    "audience_conditions": {
      "type": "string",
      "description": "JSON-encoded audience targeting conditions that determine which visitors see the experiment"
    },
    "page_ids": {
      "type": "array",
      "description": "List of page IDs where the experiment runs",
      "items": {
        "type": "integer"
      }
    },
    "created": {
      "type": "string",
      "format": "date-time",
      "description": "Timestamp when the experiment was created"
    },
    "last_modified": {
      "type": "string",
      "format": "date-time",
      "description": "Timestamp when the experiment was last modified"
    }
  },
  "$defs": {
    "Variation": {
      "type": "object",
      "description": "A variation within an experiment that represents a distinct experience shown to visitors",
      "required": ["name"],
      "properties": {
        "variation_id": {
          "type": "integer",
          "description": "Unique identifier for the variation"
        },
        "key": {
          "type": "string",
          "description": "Unique key for the variation within the experiment"
        },
        "name": {
          "type": "string",
          "description": "Human-readable name of the variation",
          "minLength": 1,
          "maxLength": 255
        },
        "weight": {
          "type": "integer",
          "description": "Traffic allocation weight in basis points (0-10000)",
          "minimum": 0,
          "maximum": 10000
        },
        "actions": {
          "type": "array",
          "description": "Changes applied when this variation is shown",
          "items": {
            "$ref": "#/$defs/Action"
          }
        }
      }
    },
    "Action": {
      "type": "object",
      "description": "A set of changes applied to a page in a variation",
      "properties": {
        "page_id": {
          "type": "integer",
          "description": "The page this action applies to"
        },
        "changes": {
          "type": "array",
          "description": "Individual changes applied on the page",
          "items": {
            "type": "object",
            "properties": {
              "type": {
                "type": "string",
                "description": "Type of change (e.g., custom_code, attribute, insert_html)"
              },
              "value": {
                "type": "string",
                "description": "The change value or code"
              },
              "selector": {
                "type": "string",
                "description": "CSS selector targeting the element to modify"
              }
            }
          }
        }
      }
    },
    "Metric": {
      "type": "object",
      "description": "A metric definition for measuring experiment outcomes",
      "required": ["event_id", "aggregator"],
      "properties": {
        "event_id": {
          "type": "integer",
          "description": "The event ID this metric tracks"
        },
        "aggregator": {
          "type": "string",
          "description": "How to aggregate the metric values",
          "enum": ["unique", "count", "sum"]
        },
        "field": {
          "type": "string",
          "description": "The field to aggregate on for sum aggregation"
        },
        "scope": {
          "type": "string",
          "description": "The scope at which to measure the metric",
          "enum": ["visitor", "session", "event"]
        },
        "winning_direction": {
          "type": "string",
          "description": "Which direction indicates improvement",
          "enum": ["increasing", "decreasing"]
        }
      }
    }
  }
}