{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://trixie.invalid/contracts/v1/version-negotiation.json",
  "title": "Trixie Version Negotiation",
  "type": "object",
  "additionalProperties": false,
  "required": ["api_version", "client_version", "server_version", "compatible"],
  "properties": {
    "api_version": { "type": "string", "const": "v1" },
    "client_version": { "type": "string", "minLength": 1 },
    "server_version": { "type": "string", "minLength": 1 },
    "compatible": { "type": "boolean" },
    "reason": { "type": "string", "minLength": 1 }
  }
}