diff --git a/libs/interpreter-lib/src/interpreter.ts b/libs/interpreter-lib/src/interpreter.ts
index 32893a082..e63bac142 100644
--- a/libs/interpreter-lib/src/interpreter.ts
+++ b/libs/interpreter-lib/src/interpreter.ts
@@ -28,6 +28,7 @@ import {
   collectStartingBlocks,
   createJayveeServices,
   getBlocksInTopologicalSorting,
+  initializeWorkspace,
 } from '@jvalue/jayvee-language-server';
 import * as chalk from 'chalk';
 import { NodeFileSystem } from 'langium/node';
@@ -82,16 +83,25 @@ export async function interpretModel(
             ', ',
           )}.`,
       );
-    process.exit(ExitCode.FAILURE);
+    return ExitCode.FAILURE;
   }
 
   useStdExtension();
   registerDefaultConstraintExecutors();
 
   const services = createJayveeServices(NodeFileSystem).Jayvee;
+  await initializeWorkspace(services);
   setupJayveeServices(services, options.env);
 
-  const model = await extractAstNodeFn(services, loggerFactory);
+  let model: JayveeModel;
+  try {
+    model = await extractAstNodeFn(services, loggerFactory);
+  } catch (e) {
+    loggerFactory
+      .createLogger()
+      .logErr('Could not extract the AST node of the given model.');
+    return ExitCode.FAILURE;
+  }
 
   const debugTargets = getDebugTargets(options.debugTarget);
 
diff --git a/libs/interpreter-lib/src/parsing-util.spec.ts b/libs/interpreter-lib/src/parsing-util.spec.ts
index 7f8ab9abf..6bd157b0c 100644
--- a/libs/interpreter-lib/src/parsing-util.spec.ts
+++ b/libs/interpreter-lib/src/parsing-util.spec.ts
@@ -27,8 +27,6 @@ describe('Validation of parsing-util', () => {
     options?: ParseHelperOptions,
   ) => Promise<LangiumDocument<AstNode>>;
 
-  let exitSpy: jest.SpyInstance;
-
   let services: JayveeServices;
 
   const logger = new CachedLogger(true, undefined, false);
@@ -39,16 +37,6 @@ describe('Validation of parsing-util', () => {
   );
 
   beforeAll(async () => {
-    // Mock Process.exit
-    exitSpy = jest
-      .spyOn(process, 'exit')
-      .mockImplementation((code?: number) => {
-        if (code === undefined || code === 0) {
-          return undefined as never;
-        }
-        throw new Error(`process.exit: ${code}`);
-      });
-
     // Create language services
     services = createJayveeServices(NodeFileSystem).Jayvee;
 
@@ -64,7 +52,6 @@ describe('Validation of parsing-util', () => {
   });
 
   afterEach(() => {
-    exitSpy.mockClear();
     logger.clearLogs();
   });
 
@@ -81,7 +68,7 @@ describe('Validation of parsing-util', () => {
 
       await parseAndValidateDocument(text);
 
-      expect(exitSpy).toHaveBeenCalledTimes(0);
+      expect(logger.getLogs().error.length).toEqual(0);
       expect(logger.getLogs().info).toHaveLength(0);
       expect(logger.getLogs().error).toHaveLength(0);
       expect(logger.getLogs().debug).toHaveLength(0);
@@ -97,8 +84,7 @@ describe('Validation of parsing-util', () => {
       try {
         await parseAndValidateDocument(text);
       } catch (e) {
-        expect(exitSpy).toHaveBeenCalledTimes(1);
-        expect(exitSpy).toHaveBeenCalledWith(1);
+        expect(logger.getLogs().error.length).toBeGreaterThanOrEqual(1);
         expect(logger.getLogs().info).toHaveLength(0);
         expect(logger.getLogs().error).toHaveLength(2 * 5); // 2 calls that get formated to 5 lines each
         expect(logger.getLogs().debug).toHaveLength(0);
@@ -115,8 +101,7 @@ describe('Validation of parsing-util', () => {
       try {
         await parseAndValidateDocument(text);
       } catch (e) {
-        expect(exitSpy).toHaveBeenCalledTimes(1);
-        expect(exitSpy).toHaveBeenCalledWith(1);
+        expect(logger.getLogs().error.length).toEqual(1);
         expect(logger.getLogs().info).toHaveLength(0);
         expect(logger.getLogs().error).toHaveLength(1);
         expect(logger.getLogs().debug).toHaveLength(0);
@@ -138,7 +123,7 @@ describe('Validation of parsing-util', () => {
         logger,
       );
 
-      expect(exitSpy).toHaveBeenCalledTimes(0);
+      expect(logger.getLogs().error.length).toEqual(0);
       expect(logger.getLogs().info).toHaveLength(0);
       expect(logger.getLogs().error).toHaveLength(0);
       expect(logger.getLogs().debug).toHaveLength(0);
@@ -158,7 +143,7 @@ describe('Validation of parsing-util', () => {
           logger,
         );
       } catch (e) {
-        expect(exitSpy).toHaveBeenCalledTimes(1);
+        expect(logger.getLogs().error.length).toEqual(1);
         expect(logger.getLogs().info).toHaveLength(0);
         expect(logger.getLogs().error).toHaveLength(1);
         expect(logger.getLogs().error[0]).toEqual(
@@ -184,7 +169,7 @@ describe('Validation of parsing-util', () => {
           logger,
         );
       } catch (e) {
-        expect(exitSpy).toHaveBeenCalledTimes(1);
+        expect(logger.getLogs().error.length).toEqual(1);
         expect(logger.getLogs().info).toHaveLength(0);
         expect(logger.getLogs().error).toHaveLength(1);
         expect(logger.getLogs().error[0]).toMatch(
diff --git a/libs/interpreter-lib/src/parsing-util.ts b/libs/interpreter-lib/src/parsing-util.ts
index a08029a09..0953f417c 100644
--- a/libs/interpreter-lib/src/parsing-util.ts
+++ b/libs/interpreter-lib/src/parsing-util.ts
@@ -28,12 +28,12 @@ export async function extractDocumentFromFile(
     }: ${extensions.map((extension) => `"${extension}"`).join(',')}`;
 
     logger.logErr(errorMessage);
-    process.exit(ExitCode.FAILURE);
+    return Promise.reject(ExitCode.FAILURE);
   }
 
   if (!fs.existsSync(fileName)) {
     logger.logErr(`File ${fileName} does not exist.`);
-    process.exit(ExitCode.FAILURE);
+    return Promise.reject(ExitCode.FAILURE);
   }
 
   const document =
@@ -79,7 +79,7 @@ export async function validateDocument(
     for (const errDiagnostic of errDiagnostics) {
       logger.logLanguageServerDiagnostic(errDiagnostic, document);
     }
-    process.exit(ExitCode.FAILURE);
+    return Promise.reject(ExitCode.FAILURE);
   }
 
   const nonErrDiagnostics = diagnostics.filter(