From 78cae1522ac36aee5bb2f2f4f4aef50f57cc25ee Mon Sep 17 00:00:00 2001
From: nicosammito <nsammito@code0.tech>
Date: Tue, 14 Apr 2026 17:31:53 +0200
Subject: [PATCH 1/2] test: add startingNodeId to flow validation tests for
 improved context

---
 test/flowValidation.test.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/test/flowValidation.test.ts b/test/flowValidation.test.ts
index 772c7ea..f0394f7 100644
--- a/test/flowValidation.test.ts
+++ b/test/flowValidation.test.ts
@@ -8,6 +8,7 @@ describe('getFlowValidation - Integrationstest', () => {
     it('1', () => {
 
         const flow: Flow = {
+            startingNodeId: "gid://sagittarius/NodeFunction/1",
             nodes: {
                 nodes: [
                     {
@@ -51,7 +52,7 @@ describe('getFlowValidation - Integrationstest', () => {
                                         __typename: "ReferenceValue",
                                         nodeFunctionId: "gid://sagittarius/NodeFunction/2",
                                         parameterIndex: 1,
-                                        inputIndex: 0, //TODO: Das wird gerade einfach nicht berücksichtigt
+                                        inputIndex: 0,
                                         referencePath: [{path: "test"}]
                                     }
                                 },
@@ -149,6 +150,7 @@ describe('getFlowValidation - Integrationstest', () => {
     it('4', () => {
 
         const flow: Flow = {
+            startingNodeId: "gid://sagittarius/NodeFunction/1",
             nodes: {
                 nodes: [
                     {
@@ -198,6 +200,7 @@ describe('getFlowValidation - Integrationstest', () => {
     it('5', () => {
 
         const flow: Flow = {
+            startingNodeId: "gid://sagittarius/NodeFunction/2",
             nodes: {
                 nodes: [
                     {

From b32a2a285f53bf9528730f3e4d8765c89d9ce13a Mon Sep 17 00:00:00 2001
From: nicosammito <nsammito@code0.tech>
Date: Tue, 14 Apr 2026 17:31:58 +0200
Subject: [PATCH 2/2] refactor: add validation for startingNodeId in flow
 execution to ensure proper flow connectivity

---
 src/validation/getFlowValidation.ts | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/src/validation/getFlowValidation.ts b/src/validation/getFlowValidation.ts
index 90fd67a..67fc36d 100644
--- a/src/validation/getFlowValidation.ts
+++ b/src/validation/getFlowValidation.ts
@@ -12,6 +12,34 @@ export const getFlowValidation = (
 ): ValidationResult => {
 
 
+    if (!flow?.startingNodeId) {
+        return {
+            isValid: false,
+            returnType: "void",
+            diagnostics: [{
+                nodeId: null,
+                parameterIndex: null,
+                code: 0,
+                message: "You need to provide a starting node to be able to execute this flow.",
+                severity: "error",
+            }]
+        }
+    }
+
+    if (!flow.nodes?.nodes?.find(n => n?.id == flow.startingNodeId)) {
+        return {
+            isValid: false,
+            returnType: "void",
+            diagnostics: [{
+                nodeId: null,
+                parameterIndex: null,
+                code: 0,
+                message: "The starting node is not linked within the flow. Please make sure the starting node is connected to the rest of the flow.",
+                severity: "error",
+            }]
+        }
+    }
+
     const sourceCode = generateFlowSourceCode(flow, functions, dataTypes);
 
     // 3. Virtual TypeScript Compilation