diff --git a/design/prototype.ts b/design/prototype.ts
index 74b9ec497..b59db3019 100644
--- a/design/prototype.ts
+++ b/design/prototype.ts
@@ -9,8 +9,7 @@
 import fs from "fs";
 import path from "path";
 
-const API_KEY = process.env.OPENAI_API_KEY
-  || JSON.parse(fs.readFileSync(path.join(process.env.HOME!, ".gstack/openai.json"), "utf-8")).api_key;
+const API_KEY = process.env.OPENAI_API_KEY;
 
 if (!API_KEY) {
   console.error("No API key found. Set OPENAI_API_KEY or save to ~/.gstack/openai.json");
@@ -85,7 +84,8 @@ async function generateMockup(brief: { name: string; prompt: string }) {
     return null;
   }
 
-  const outputPath = path.join(OUTPUT_DIR, `${brief.name}.png`);
+  const safeName = brief.name.replace(/[^a-zA-Z0-9_-]/g, "_");
+  const outputPath = OUTPUT_DIR + "/" + safeName + ".png";
   const imageBuffer = Buffer.from(imageItem.result, "base64");
   fs.writeFileSync(outputPath, imageBuffer);
 
@@ -109,7 +109,7 @@ async function main() {
       const resultPath = await generateMockup(brief);
       results.push({ name: brief.name, path: resultPath });
     } catch (err) {
-      console.error(`ERROR generating ${brief.name}:`, err);
+      console.error("ERROR generating:", brief.name, err);
       results.push({ name: brief.name, path: null });
     }
   }
@@ -124,7 +124,7 @@ async function main() {
   console.log(`${succeeded.length}/${results.length} generated successfully`);
 
   if (failed.length > 0) {
-    console.log(`Failed: ${failed.map(f => f.name).join(", ")}`);
+    console.log("Failed:", failed.map(f => f.name).join(", "));
   }
 
   if (succeeded.length > 0) {