{
  "name": "config.get",
  "description": "Reads a single setting from appsettings.json by dotted key path (e.g. 'magic:auth:secret')",
  "signature": {
    "input": {
      "kind": "config-key",
      "description": "Configuration key to retrieve",
      "required": true,
      "mode": "ValueOrExpression"
    },
    "children": {
      "*": {
        "type": "string",
        "kind": "config-default",
        "description": "Default value source evaluated and returned when the configuration key does not exist",
        "required": false,
        "mode": "ExecutableLambda",
        "cardinality": "ZeroOrOne",
        "role": "SourceExpression",
        "evaluation": "EvalSelf",
        "projection": "Value"
      }
    },
    "output": {
      "mode": "Value",
      "kind": "config-value,text",
      "description": "Resolves to the configuration value, or the first child value when the key is missing"
    }
  }
}