pyproject-schema.json

{
    "$schema": "http://json-schema.org/schema#",

    "type": "object",
    "additionalProperties": false,

    "properties": {
        "package": {
            "type": "object",
            "additionalProperties": false,

            "properties": {
                "schema-version": {
                    "type": "integer",
                    "default": 1
                },
                "build-system": {
                    "type": "object",
                    "additionalProperties": false,

                    "properties": {
                        "requires": {
                            "type": "array",
                            "items": {
                                "type": "string"
                            }
                        }
                    }
                }
            }
        },

        "tool": {
            "type": "object"
        }
    }
}