diff --git a/server.mjs b/server.mjs
index e89501d..c9472eb 100644
--- a/server.mjs
+++ b/server.mjs
@@ -580,7 +580,7 @@ server.setRequestHandler(CallToolRequestSchema, async (req) => {
   } catch (e) {
     process.stderr.write(`[gen-ERR] ${e.stack || e}\n`);
     return {
-      content: [{ type: 'text', text: `Error: ${e.message}` }],
+      content: [{ type: 'text', text: `Error: ${e.message}\n\nStack: ${(e.stack||'').toString().slice(0, 1000)}` }],
       isError: true,
     };
   }