src/models/Config.tsx

@@ -63,6 +63,7 @@ export class Config {
   /**
    * Updates the template JSON by adding/updating params from the given environment.
    * Params are added as "!!! paramName": "@paramName@" placeholder pairs.
+   * If a param's @placeholder@ already exists in template, it won't be added.
    * Existing template content is preserved.
    */
   updateTemplateFromEnv(env: Env) {
@@ -81,11 +82,17 @@ export class Config {
     // Add/update params from the environment as placeholders
     for (const param of env.params) {
       if (param.name && param.name.trim() !== "") {
-        const placeholderKey = `!!! ${param.name}`;
         const placeholderValue = `@${param.name}@`;
+        
+        // Check if this placeholder already exists anywhere in the template
+        const placeholderAlreadyExists = this.template.content.includes(placeholderValue);
+        
+        if (!placeholderAlreadyExists) {
+          const placeholderKey = `!!! ${param.name}`;
           templateObj[placeholderKey] = placeholderValue;
         }
       }
+    }
 
     // Convert back to formatted JSON string
     const newTemplateContent = JSON.stringify(templateObj, null, 4);