{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://sediment.so/schemas/derived-artifacts/fate/v2.json",
  "title": "Fate",
  "description": "One Edit observation's derived final Fate.",
  "type": "object",
  "properties": {
    "observation_id": {
      "type": "string",
      "description": "Stable id for this edit observation."
    },
    "org_id": {
      "type": "string",
      "description": "The deployment's tenant id, normalized. Bound to the server."
    },
    "agent_harness": {
      "enum": [
        "claude-code",
        "copilot",
        "codex",
        "cursor",
        "pi"
      ],
      "type": "string",
      "description": "Which coding agent harness produced this fact."
    },
    "session_id": {
      "type": "string",
      "description": "The coding-agent session this belongs to (ADR 0002)."
    },
    "call_id": {
      "type": "string",
      "description": "The edit tool-call id that joins this Fate to its decision."
    },
    "score": {
      "type": "number",
      "description": "The scorer result after clamping to [0, 1], before threshold mapping."
    },
    "fate": {
      "enum": [
        "deleted",
        "partially_modified",
        "unmodified"
      ],
      "type": "string",
      "description": "The categorical final Fate assigned from the retention score."
    },
    "external_lines_added": {
      "anyOf": [
        {
          "type": "integer"
        },
        {
          "type": "null"
        }
      ],
      "description": "Accumulated external lines added from this edit through Session end. Null when any window in the tail lacks coverage."
    },
    "external_lines_removed": {
      "anyOf": [
        {
          "type": "integer"
        },
        {
          "type": "null"
        }
      ],
      "description": "Accumulated external lines removed from this edit through Session end. Null when any window in the tail lacks coverage."
    },
    "provenance": {
      "$ref": "#/$defs/Provenance",
      "description": "The structured provenance for this artifact."
    }
  },
  "additionalProperties": false,
  "required": [
    "observation_id",
    "org_id",
    "agent_harness",
    "session_id",
    "call_id",
    "score",
    "fate",
    "external_lines_added",
    "external_lines_removed",
    "provenance"
  ],
  "$defs": {
    "Provenance": {
      "type": "object",
      "properties": {
        "policy_version": {
          "type": "string",
          "description": "The derivation implementation policy version."
        },
        "quarantine_revision": {
          "type": "integer",
          "description": "The integer quarantine-log high-water mark used for the derivation."
        },
        "policy_digest": {
          "anyOf": [
            {
              "type": "string"
            },
            {
              "type": "null"
            }
          ],
          "description": "SHA-256 of the fully resolved derivation policy when available."
        }
      },
      "additionalProperties": false,
      "required": [
        "policy_version",
        "quarantine_revision",
        "policy_digest"
      ]
    }
  }
}