feat: use structuredContent with outputSchema in example servers (#220)

* build app-with-deps

* make registerAppTool more interchangeable w/ server.registerTool

* feat: use structuredContent in all example servers

All servers now return structuredContent alongside JSON text content.
All mcp-apps now read structuredContent directly (no JSON.parse fallback).

Updated servers:
- basic-server-vanillajs
- budget-allocator-server
- cohort-heatmap-server
- customer-segmentation-server
- integration-server
- scenario-modeler-server
- system-monitor-server
- threejs-server
- video-resource-server
- wiki-explorer-server

* feat: add outputSchema to all example servers

Define output schemas for structuredContent validation:
- basic-server-vanillajs: { time: string }
- budget-allocator-server: BudgetDataResponseSchema
- cohort-heatmap-server: CohortDataSchema
- customer-segmentation-server: customers/segments schema
- integration-server: { time: string }
- scenario-modeler-server: templates/defaultInputs schema
- system-monitor-server: SystemStatsSchema
- threejs-server: { code, height }
- video-resource-server: { videoUri, description }
- wiki-explorer-server: { page, links, error }

* prettier:fix

* make registerAppTool more interchangeable w/ server.registerTool

* feat: use structuredContent in all example servers

All servers now return structuredContent alongside JSON text content.
All mcp-apps now read structuredContent directly (no JSON.parse fallback).

Updated servers:
- basic-server-vanillajs
- budget-allocator-server
- cohort-heatmap-server
- customer-segmentation-server
- integration-server
- scenario-modeler-server
- system-monitor-server
- threejs-server
- video-resource-server
- wiki-explorer-server

* feat: add outputSchema to all example servers

Define output schemas for structuredContent validation:
- basic-server-vanillajs: { time: string }
- budget-allocator-server: BudgetDataResponseSchema
- cohort-heatmap-server: CohortDataSchema
- customer-segmentation-server: customers/segments schema
- integration-server: { time: string }
- scenario-modeler-server: templates/defaultInputs schema
- system-monitor-server: SystemStatsSchema
- threejs-server: { code, height }
- video-resource-server: { videoUri, description }
- wiki-explorer-server: { page, links, error }

* prettier:fix

* revert: remove unrelated workflow, version, and arch changes

* chore: update package-lock.json

* refactor(basic-server-vanillajs): address PR review comments

- Simplify server.ts to return plain time string in text content (not JSON),
  matching the quickstart guide pattern
- Add defensive coding in mcp-app.ts with optional chaining and fallback
  to handle potential type mismatches gracefully

* refactor: restore rich text formatting for LLM-readable content

Restore the human-readable text formatting functions that were removed,
providing meaningful summaries in the text content while keeping
structuredContent for programmatic UI consumption:

- budget-allocator-server: formatBudgetSummary with config overview
- cohort-heatmap-server: formatCohortSummary with retention stats
- scenario-modeler-server: formatScenarioSummary with financial metrics

examples/wiki-explorer-server/src/mcp-app.ts

@@ -322,44 +322,36 @@ app.ontoolresult = (result) => {
 };
 
 function handleToolResultData(result: CallToolResult): void {
-  if (
-    result.isError ||
-    !result.content?.[0] ||
-    result.content[0].type !== "text"
-  ) {
+  if (result.isError) {
     console.error("Tool result error:", result);
     return;
   }
 
-  try {
-    const response: ToolResponse = JSON.parse(result.content[0].text);
-    const { page, links, error } = response;
+  const response = result.structuredContent as unknown as ToolResponse;
+  const { page, links, error } = response;
 
-    // Ensure the source node exists
-    addNode(page.url, page.title);
-    updateNodeTitle(page.url, page.title);
+  // Ensure the source node exists
+  addNode(page.url, page.title);
+  updateNodeTitle(page.url, page.title);
 
-    if (error) {
-      setNodeState(page.url, "error", error);
-    } else {
-      // Get source node position so new nodes appear nearby
-      const sourceNode = graphData.nodes.find((n) => n.url === page.url);
-      const sourcePos = sourceNode
-        ? { x: sourceNode.x ?? 0, y: sourceNode.y ?? 0 }
-        : undefined;
+  if (error) {
+    setNodeState(page.url, "error", error);
+  } else {
+    // Get source node position so new nodes appear nearby
+    const sourceNode = graphData.nodes.find((n) => n.url === page.url);
+    const sourcePos = sourceNode
+      ? { x: sourceNode.x ?? 0, y: sourceNode.y ?? 0 }
+      : undefined;
 
-      // Add all linked nodes and edges
-      for (const link of links) {
-        addNode(link.url, link.title, "default", sourcePos);
-        addEdge(page.url, link.url);
-      }
-      setNodeState(page.url, "expanded");
+    // Add all linked nodes and edges
+    for (const link of links) {
+      addNode(link.url, link.title, "default", sourcePos);
+      addEdge(page.url, link.url);
     }
-
-    updateGraph();
-  } catch (e) {
-    console.error("Failed to parse tool result:", e);
+    setNodeState(page.url, "expanded");
   }
+
+  updateGraph();
 }
 
 app.onerror = (err) => {