{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://colab.research.google.com/schemas/notebook.json",
  "title": "Google Colab Notebook",
  "description": "Schema for a Google Colab notebook file in Jupyter notebook format (.ipynb), containing code cells, text cells, metadata, and execution outputs.",
  "type": "object",
  "required": ["nbformat", "nbformat_minor", "metadata", "cells"],
  "properties": {
    "nbformat": {
      "type": "integer",
      "description": "Notebook format major version",
      "const": 4
    },
    "nbformat_minor": {
      "type": "integer",
      "description": "Notebook format minor version",
      "minimum": 0
    },
    "metadata": {
      "$ref": "#/$defs/NotebookMetadata"
    },
    "cells": {
      "type": "array",
      "description": "The cells in the notebook",
      "items": {
        "$ref": "#/$defs/Cell"
      }
    }
  },
  "$defs": {
    "NotebookMetadata": {
      "type": "object",
      "description": "Notebook-level metadata including Colab-specific settings",
      "properties": {
        "colab": {
          "type": "object",
          "properties": {
            "name": {
              "type": "string",
              "description": "The notebook name displayed in Colab"
            },
            "provenance": {
              "type": "array",
              "items": {
                "type": "object"
              }
            },
            "collapsed_sections": {
              "type": "array",
              "items": {
                "type": "string"
              }
            },
            "toc_visible": {
              "type": "boolean"
            }
          }
        },
        "kernelspec": {
          "type": "object",
          "properties": {
            "name": {
              "type": "string",
              "default": "python3"
            },
            "display_name": {
              "type": "string",
              "default": "Python 3"
            }
          }
        },
        "language_info": {
          "type": "object",
          "properties": {
            "name": {
              "type": "string",
              "default": "python"
            }
          }
        },
        "accelerator": {
          "type": "string",
          "description": "Hardware accelerator type",
          "enum": ["GPU", "TPU", "NONE"]
        }
      }
    },
    "Cell": {
      "type": "object",
      "required": ["cell_type", "source", "metadata"],
      "properties": {
        "cell_type": {
          "type": "string",
          "enum": ["code", "markdown", "raw"],
          "description": "The type of cell"
        },
        "source": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "The source content of the cell as an array of lines"
        },
        "metadata": {
          "type": "object",
          "properties": {
            "id": {
              "type": "string"
            },
            "colab_type": {
              "type": "string"
            }
          },
          "additionalProperties": true
        },
        "execution_count": {
          "type": ["integer", "null"],
          "description": "Execution count for code cells"
        },
        "outputs": {
          "type": "array",
          "description": "Outputs from code cell execution",
          "items": {
            "$ref": "#/$defs/Output"
          }
        }
      }
    },
    "Output": {
      "type": "object",
      "description": "An output from a code cell execution",
      "properties": {
        "output_type": {
          "type": "string",
          "enum": ["stream", "display_data", "execute_result", "error"]
        },
        "text": {
          "type": "array",
          "items": {
            "type": "string"
          }
        },
        "data": {
          "type": "object",
          "additionalProperties": true
        },
        "name": {
          "type": "string",
          "enum": ["stdout", "stderr"]
        },
        "ename": {
          "type": "string"
        },
        "evalue": {
          "type": "string"
        },
        "traceback": {
          "type": "array",
          "items": {
            "type": "string"
          }
        }
      }
    }
  }
}