{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "MCP Structured Document Schema (JSON Schema Valid)",
  "description": "Strict meta-schema for structured tools using zod compatible fields.",
  "type": "object",
  "required": ["metadata", "fields"],
  "properties": {
    "metadata": {
      "type": "object",
      "required": [
        "schemaName",
        "description",
        "identifierField",
        "pathTemplate",
        "pathComponents"
      ],
      "properties": {
        "schemaName": {
          "type": "string"
        },
        "description": {
          "type": "string"
        },
        "identifierField": {
          "type": "string"
        },
        "pathTemplate": {
          "type": "string"
        },
        "pathComponents": {
          "type": "array",
          "items": {
            "type": "string"
          }
        }
      },
      "additionalProperties": false
    },
    "fields": {
      "type": "object",
      "patternProperties": {
        "^[a-zA-Z_][a-zA-Z0-9_]*$": {
          "type": "object",
          "required": ["type"],
          "properties": {
            "type": {
              "type": "string",
              "enum": [
                "string",
                "number",
                "boolean",
                "date",
                "array",
                "object",
                "literal",
                "unknown",
                "any"
              ]
            },
            "description": {
              "type": "string"
            },
            "default": {},
            "minimum": {
              "type": "number"
            },
            "maximum": {
              "type": "number"
            },
            "enum": {
              "type": "array",
              "items": {}
            },
            "items": {
              "type": "object"
            },
            "properties": {
              "type": "object"
            },
            "required": {
              "type": "array",
              "items": {
                "type": "string"
              }
            }
          },
          "additionalProperties": true
        }
      },
      "additionalProperties": false
    }
  },
  "additionalProperties": false
}