feat(core): Implement Dynamic Parameters within regular nodes used as AI Tools (#10862)

packages/workflow/src/WorkflowDataProxy.ts

@@ -961,6 +961,43 @@ export class WorkflowDataProxy {
 			return taskData.data!.main[previousNodeOutput]![pairedItem.item];
 		};
 
+		const handleFromAi = (
+			name: string,
+			_description?: string,
+			_type: string = 'string',
+			defaultValue?: unknown,
+		) => {
+			if (!name || name === '') {
+				throw new ExpressionError('Please provide a key', {
+					runIndex: that.runIndex,
+					itemIndex: that.itemIndex,
+				});
+			}
+			const nameValidationRegex = /^[a-zA-Z0-9_-]{0,64}$/;
+			if (!nameValidationRegex.test(name)) {
+				throw new ExpressionError(
+					'Invalid parameter key, must be between 1 and 64 characters long and only contain lowercase letters, uppercase letters, numbers, underscores, and hyphens',
+					{
+						runIndex: that.runIndex,
+						itemIndex: that.itemIndex,
+					},
+				);
+			}
+			const placeholdersDataInputData =
+				that.runExecutionData?.resultData.runData[that.activeNodeName]?.[0].inputOverride?.[
+					NodeConnectionType.AiTool
+				]?.[0]?.[0].json;
+
+			if (Boolean(!placeholdersDataInputData)) {
+				throw new ExpressionError('No execution data available', {
+					runIndex: that.runIndex,
+					itemIndex: that.itemIndex,
+					type: 'no_execution_data',
+				});
+			}
+			return placeholdersDataInputData?.[name] ?? defaultValue;
+		};
+
 		const base = {
 			$: (nodeName: string) => {
 				if (!nodeName) {
@@ -1303,6 +1340,10 @@ export class WorkflowDataProxy {
 				);
 				return dataProxy.getDataProxy();
 			},
+			$fromAI: handleFromAi,
+			// Make sure mis-capitalized $fromAI is handled correctly even though we don't auto-complete it
+			$fromai: handleFromAi,
+			$fromAi: handleFromAi,
 			$items: (nodeName?: string, outputIndex?: number, runIndex?: number) => {
 				if (nodeName === undefined) {
 					nodeName = (that.prevNodeGetter() as { name: string }).name;