{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "wendkeep://schema/mcp-tool-result-v1",
  "title": "WendKeep MCP tool result v1",
  "type": "object",
  "required": ["schema_version"],
  "properties": {
    "schema_version": { "const": 1 },
    "items": { "type": "array" },
    "next_cursor": { "type": "string" },
    "error": {
      "type": "object",
      "additionalProperties": false,
      "required": ["code", "message", "retryable"],
      "properties": {
        "code": { "type": "string", "pattern": "^MCP_[A-Z0-9_]+$" },
        "message": { "type": "string", "maxLength": 500 },
        "retryable": { "type": "boolean" }
      }
    }
  }
}