diff --git a/.gitignore b/.gitignore
index f89d013..aad11bf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -46,5 +46,5 @@ backup/
 # Plugins build outputs
 plugins/*/dist/
 
-# Secrets API_KEYS
+# Secrets API Keys
 .env
diff --git a/scripts/node/package.json b/scripts/node/package.json
index dabd41a..9cecc3b 100644
--- a/scripts/node/package.json
+++ b/scripts/node/package.json
@@ -5,10 +5,10 @@
   "main": "promptops.js",
   "type": "module",
   "scripts": {
-    "test": "tsx --test --test-reporter=spec \"**/*.test.ts\"",
-    "test:unit": "tsx --test --test-reporter=spec \"plugins/**/*.test.ts\"",
-    "test:integration": "tsx --test --test-reporter=spec \"tests/integration/**/*.test.ts\"",
-    "test:all": "tsx --test --test-reporter=spec \"**/*.test.ts\"",
+    "test": "tsx --test --test-concurrency=1 --test-reporter=spec \"**/*.test.ts\"",
+    "test:unit": "tsx --test --test-concurrency=1 --test-reporter=spec \"plugins/**/*.test.ts\"",
+    "test:integration": "tsx --test --test-concurrency=1 --test-reporter=spec \"tests/integration/**/*.test.ts\"",
+    "test:all": "tsx --test --test-concurrency=1 --test-reporter=spec \"**/*.test.ts\"",
     "test:watch": "tsx --test --watch \"**/*.test.ts\"",
     "lint": "echo 'No linting configured'",
     "build": "tsc",
diff --git a/scripts/node/plugins/builtins/promptor-matrix/PromptorPlugin.test.ts b/scripts/node/plugins/builtins/promptor-matrix/PromptorPlugin.test.ts
index 594eda5..1c1de58 100644
--- a/scripts/node/plugins/builtins/promptor-matrix/PromptorPlugin.test.ts
+++ b/scripts/node/plugins/builtins/promptor-matrix/PromptorPlugin.test.ts
@@ -51,17 +51,23 @@ describe('PromptorPlugin', () => {
     it('should return success result', async () => {
       const result = await plugin.execute({});
       assert.ok(typeof result === 'object');
-      assert.strictEqual((result as any).success, true);
+      assert.ok(result !== null);
+      const obj = result as Record<string, unknown>;
+      assert.strictEqual(obj.success, true);
     });
 
     it('should return matrix in result', async () => {
       const result = await plugin.execute({});
-      assert.ok((result as any).matrix?.length > 0);
+      const obj = result as Record<string, unknown>;
+      assert.ok(typeof obj.matrix === 'string');
+      assert.ok((obj.matrix as string).length > 0);
     });
 
     it('should return instructions in result', async () => {
       const result = await plugin.execute({});
-      assert.ok((result as any).instructions?.includes('Copier-coller'));
+      const obj = result as Record<string, unknown>;
+      assert.ok(typeof obj.instructions === 'string');
+      assert.ok((obj.instructions as string).includes('Copier-coller'));
     });
   });
 
diff --git a/scripts/node/plugins/builtins/promptor-matrix/PromptorPlugin.ts b/scripts/node/plugins/builtins/promptor-matrix/PromptorPlugin.ts
index 0831ef4..752d240 100644
--- a/scripts/node/plugins/builtins/promptor-matrix/PromptorPlugin.ts
+++ b/scripts/node/plugins/builtins/promptor-matrix/PromptorPlugin.ts
@@ -32,7 +32,7 @@ export class PromptorPlugin implements IPlugin {
   /**
    * Exécution : affiche la matrice pour l'utilisateur
    */
-  async execute(input: unknown): Promise<unknown> {
+  async execute(input: unknown): Promise<{ success: boolean; matrix: string; instructions: string }> {
     await this.initialize();
     
     // En-tête
@@ -55,7 +55,7 @@ export class PromptorPlugin implements IPlugin {
     
     return { 
       success: true, 
-      matrix: this.matrix,
+      matrix: String(this.matrix),
       instructions: 'Copier-coller dans ton LLM préféré'
     };
   }