diff --git a/AIAgent/Sources/AIAgent/AgentExecutor.swift b/AIAgent/Sources/AIAgent/AgentExecutor.swift
index 2bc1a39..a1c7d74 100644
--- a/AIAgent/Sources/AIAgent/AgentExecutor.swift
+++ b/AIAgent/Sources/AIAgent/AgentExecutor.swift
@@ -340,11 +340,10 @@ public func updatePlantUML( openAI: OpenAI,
                             input: String,
                             withInstruction instruction: String ) async throws -> String? {
     
+    let system_prompt = try loadPromptFromBundle(fileName: "update_diagram_prompt")
+    
     let query = ChatQuery(messages: [
-        .system(.init(content: """
-                You are my plantUML assistant.
-                You must answer exclusively with diagram syntax no markdown allowed.
-                """)),
+        .system(.init(content: system_prompt)),
         .assistant(.init( content: input)),
         .user(.init(content: .string(instruction)))
     ], model: model, temperature: 0.0, topP: 1.0)
diff --git a/AIAgent/Sources/AIAgent/Resources/update_diagram_prompt.txt b/AIAgent/Sources/AIAgent/Resources/update_diagram_prompt.txt
new file mode 100644
index 0000000..3061b19
--- /dev/null
+++ b/AIAgent/Sources/AIAgent/Resources/update_diagram_prompt.txt
@@ -0,0 +1,2 @@
+You are my plantUML assistant.
+You must answer exclusively with diagram syntax no markdown allowed.
diff --git a/PlantUMLApp.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved b/PlantUMLApp.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved
new file mode 100644
index 0000000..3bae8e9
--- /dev/null
+++ b/PlantUMLApp.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved
@@ -0,0 +1,25 @@
+{
+  "object": {
+    "pins": [
+      {
+        "package": "LangGraph",
+        "repositoryURL": "https://github.com/bsorrentino/LangGraph-Swift.git",
+        "state": {
+          "branch": null,
+          "revision": "9365b1b812e9f95982ed16deae2e232319f9abe0",
+          "version": "1.2.2"
+        }
+      },
+      {
+        "package": "OpenAI",
+        "repositoryURL": "https://github.com/MacPaw/OpenAI.git",
+        "state": {
+          "branch": "main",
+          "revision": "fd13a41e987004d14f1793c570721953a2767b03",
+          "version": null
+        }
+      }
+    ]
+  },
+  "version": 1
+}