diff --git a/src/models/Config.tsx b/src/models/Config.tsx
index 2f5f2eb..4c9fff9 100644
--- a/src/models/Config.tsx
+++ b/src/models/Config.tsx
@@ -63,11 +63,12 @@ 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) {
     let templateObj: Record<string, any> = {};
-    
+
     // Try to parse existing template as JSON
     try {
       if (this.template.content.trim()) {
@@ -81,9 +82,15 @@ 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}@`;
-        templateObj[placeholderKey] = placeholderValue;
+        
+        // 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;
+        }
       }
     }