{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://example.invalid/ai-agent-engineer/context-pack.schema.json",
  "title": "Deterministic context pack",
  "type": "object",
  "properties": {
    "fixture_version": {"type": "string", "minLength": 1},
    "selector_version": {"type": "string", "minLength": 1},
    "as_of": {"type": "string", "format": "date"},
    "budget_tokens": {"type": "integer", "minimum": 1},
    "used_tokens": {"type": "integer", "minimum": 0},
    "remaining_tokens": {"type": "integer", "minimum": 0},
    "selected": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "id": {"type": "string", "minLength": 1},
          "section": {
            "type": "string",
            "enum": ["policy", "state", "evidence", "current-input"]
          },
          "source_uri": {"type": "string", "minLength": 1},
          "source_version": {"type": "string", "minLength": 1},
          "effective_from": {"type": "string", "format": "date"},
          "expires_on": {
            "anyOf": [
              {"type": "string", "format": "date"},
              {"type": "null"}
            ]
          },
          "trust": {"type": "string", "minLength": 1},
          "required": {"type": "boolean"},
          "estimated_tokens": {"type": "integer", "minimum": 1},
          "content": {"type": "string", "minLength": 1}
        },
        "required": [
          "id",
          "section",
          "source_uri",
          "source_version",
          "effective_from",
          "expires_on",
          "trust",
          "required",
          "estimated_tokens",
          "content"
        ],
        "additionalProperties": false
      }
    },
    "excluded": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "id": {"type": "string", "minLength": 1},
          "reason": {
            "type": "string",
            "enum": [
              "permission_denied",
              "trust_denied",
              "not_yet_effective",
              "expired",
              "duplicate",
              "budget"
            ]
          }
        },
        "required": ["id", "reason"],
        "additionalProperties": false
      }
    }
  },
  "required": [
    "fixture_version",
    "selector_version",
    "as_of",
    "budget_tokens",
    "used_tokens",
    "remaining_tokens",
    "selected",
    "excluded"
  ],
  "additionalProperties": false
}