src/pages/VisProgPage/visualProgrammingUI/components/WarningSidebar.module.css

@@ -60,11 +60,11 @@
 }
 
 .warning-item--warning {
-    border-left: 3px solid orange;
+    border: 3px solid orange;
 }
 
 .warning-item--info {
-    border-left: 3px solid steelblue;
+    border: 3px solid steelblue;
 }
 
 .warning-item .meta {

src/pages/VisProgPage/visualProgrammingUI/nodes/EndNode.tsx

@@ -1,12 +1,15 @@
 import {
   type NodeProps,
   Position,
-  type Node,
+  type Node, useNodeConnections
 } from '@xyflow/react';
+import {useEffect} from "react";
+import type {EditorWarning} from "../components/EditorWarnings.tsx";
 import { Toolbar } from '../components/NodeComponents';
 import styles from '../../VisProg.module.css';
 import {SingleConnectionHandle} from "../components/RuleBasedHandle.tsx";
 import {allowOnlyConnectionsFromType} from "../HandleRules.ts";
+import useFlowStore from "../VisProgStores.tsx";
 
 
 
@@ -27,6 +30,27 @@ export type EndNode = Node<EndNodeData>
  * @returns React.JSX.Element
  */
 export default function EndNode(props: NodeProps<EndNode>) {
+  const {registerWarning, unregisterWarning} = useFlowStore.getState();
+  const connections = useNodeConnections({
+    id: props.id,
+    handleId: 'target'
+  })
+
+  useEffect(() => {
+    const noConnectionWarning : EditorWarning = {
+      scope: {
+        id: props.id,
+        handleId: 'target'
+      },
+      type: 'MISSING_INPUT',
+      severity: "ERROR",
+      description: "the endNode does not have an incoming connection from a phaseNode"
+    }
+
+    if (connections.length === 0) { registerWarning(noConnectionWarning); }
+    else { unregisterWarning(props.id, `${noConnectionWarning.type}:target`); }
+  }, [connections.length, props.id, registerWarning, unregisterWarning]);
+
   return (
     <>
       <Toolbar nodeId={props.id} allowDelete={false}/>

src/pages/VisProgPage/visualProgrammingUI/nodes/PhaseNode.tsx

@@ -1,8 +1,10 @@
 import {
   type NodeProps,
   Position,
-  type Node
+  type Node, useNodeConnections
 } from '@xyflow/react';
+import {useEffect} from "react";
+import type {EditorWarning} from "../components/EditorWarnings.tsx";
 import { Toolbar } from '../components/NodeComponents';
 import styles from '../../VisProg.module.css';
 import {SingleConnectionHandle, MultiConnectionHandle} from "../components/RuleBasedHandle.tsx";
@@ -41,6 +43,27 @@ export default function PhaseNode(props: NodeProps<PhaseNode>) {
   const updateLabel = (value: string) => updateNodeData(props.id, {...data, label: value});
   const label_input_id = `phase_${props.id}_label_input`;
 
+  const {registerWarning, unregisterWarning} = useFlowStore.getState();
+  const connections = useNodeConnections({
+    id: props.id,
+    handleId: 'data'
+  })
+
+  useEffect(() => {
+    const noConnectionWarning : EditorWarning = {
+      scope: {
+        id: props.id,
+        handleId: 'data'
+      },
+      type: 'MISSING_INPUT',
+      severity: "WARNING",
+      description: "the phaseNode has no incoming goals, norms, and/or triggers"
+    }
+
+    if (connections.length === 0) { registerWarning(noConnectionWarning); }
+    else { unregisterWarning(props.id, `${noConnectionWarning.type}:source`); }
+  }, [connections.length, props.id, registerWarning, unregisterWarning]);
+
   return (
     <>
       <Toolbar nodeId={props.id} allowDelete={true}/>