diff --git a/genaisrc/myai.genai.mts b/genaisrc/myai.genai.mts
index bd20c65e7..20cdd5763 100644
--- a/genaisrc/myai.genai.mts
+++ b/genaisrc/myai.genai.mts
@@ -210,4 +210,30 @@ export async function invokeLLMOpt(code: string) {
     }
     );
     return answer.text;
+}
+
+export async function invokeLLMClassInvariant(header : string, code : string) {
+    const answer = await runPrompt(
+        (_) => {
+            _.def("HEADER", header);
+            _.def("CODE", code);
+            _.$`You are a highly experienced compiler engineer with over 20 years of expertise, 
+        specializing in C and C++ programming. Your deep knowledge of best coding practices 
+        and software engineering principles enables you to produce robust, efficient, and 
+        maintainable code in any scenario.
+
+        Please create class invariant methods for the classes used in <CODE>.
+        The signature of the class invariant methods should be 'bool well_formed()'.
+        If the code already has class invariant methods, please do not add new ones.
+        Create only code for the class invariant methods and optionally auxiliary helper functions.
+
+        In addition, for each method, provide pre and post conditions.
+        Include the well_formed() method in the pre and post conditions if it should be included.      
+        `        
+        }, {
+        system: [],
+        systemSafety: false
+    }
+    );
+    return answer.text;
 }
\ No newline at end of file
diff --git a/genaisrc/specbot.genai.mts b/genaisrc/specbot.genai.mts
new file mode 100644
index 000000000..0f0e2d121
--- /dev/null
+++ b/genaisrc/specbot.genai.mts
@@ -0,0 +1,13 @@
+
+script({
+    title: "optimize functions in a file",
+    files: "src/muz/spacer/spacer_qe_project.cpp"
+})
+
+import { invokeLLMClassInvariant} from "./myai.genai.mts";
+
+const headerFile = env.files[0];
+const cppFile = env.files[1];
+let answer = await invokeLLMClassInvariant(headerFile.content, cppFile.content);
+
+await workspace.writeText(headerFile.filename + ".spec.h", answer);
\ No newline at end of file