0.2.1 release

Author: ChernovAndrey

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@faim-group/mcp",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "description": "MCP server for FAIM forecasting SDK - Enables Claude to perform time series forecasting using Chronos2 and TiRex models",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",

src/index.ts

@@ -129,7 +129,7 @@ server.tool(
     x: z
       .any()
       .describe(
-        'Time series data to forecast from. Can be a 1D array (single series), 2D array (multiple series/batch or multivariate per model), or 3D array (batch, sequence, features).'
+        'Time series data to forecast from. MUST be an array, NOT a string. Can be a 1D array [1,2,3,4,5], 2D array [[1,2],[3,4]] (multiple series/batch or multivariate per model), or 3D array [[[1],[2]]] (batch, sequence, features). Never pass x as a JSON string - always pass as an actual array.'
       ),
     horizon: z
       .number()

src/utils/validation.ts

@@ -115,8 +115,23 @@ export function validateForecastRequest(request: unknown): ErrorResponse | null
     };
   }
 
+  // Handle case where x is passed as a JSON string (e.g., from Claude Desktop)
+  let xData = req.x;
+  if (typeof xData === 'string') {
+    try {
+      xData = JSON.parse(xData);
+    } catch (e) {
+      return {
+        error_code: 'INVALID_PARAMETER',
+        message: 'x parameter must be an array. If passing as string, it must be valid JSON.',
+        field: 'x',
+        details: `Failed to parse x: ${(e as Error).message}`,
+      };
+    }
+  }
+
   // Validate x is an array-like structure
-  const xError = validateArrayInput(req.x);
+  const xError = validateArrayInput(xData);
   if (xError) {
     return {
       error_code: xError.error_code,