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/budget-allocator-server/server.ts

@@ -224,6 +224,30 @@ function generateHistory(
   return months;
 }
 
+// ---------------------------------------------------------------------------
+// Response Formatting
+// ---------------------------------------------------------------------------
+
+function formatBudgetSummary(data: BudgetDataResponse): string {
+  const lines: string[] = [
+    "Budget Allocator Configuration",
+    "==============================",
+    "",
+    `Default Budget: ${data.config.currencySymbol}${data.config.defaultBudget.toLocaleString()}`,
+    `Available Presets: ${data.config.presetBudgets.map((b) => `${data.config.currencySymbol}${b.toLocaleString()}`).join(", ")}`,
+    "",
+    "Categories:",
+    ...data.config.categories.map(
+      (c) => `  - ${c.name}: ${c.defaultPercent}% default`,
+    ),
+    "",
+    `Historical Data: ${data.analytics.history.length} months`,
+    `Benchmark Stages: ${data.analytics.stages.join(", ")}`,
+    `Default Stage: ${data.analytics.defaultStage}`,
+  ];
+  return lines.join("\n");
+}
+
 // ---------------------------------------------------------------------------
 // MCP Server Setup
 // ---------------------------------------------------------------------------
@@ -248,6 +272,7 @@ export function createServer(): McpServer {
       description:
         "Returns budget configuration with 24 months of historical allocations and industry benchmarks by company stage",
       inputSchema: {},
+      outputSchema: BudgetDataResponseSchema,
       _meta: { [RESOURCE_URI_META_KEY]: resourceUri },
     },
     async (): Promise<CallToolResult> => {
@@ -276,9 +301,10 @@ export function createServer(): McpServer {
         content: [
           {
             type: "text",
-            text: JSON.stringify(response),
+            text: formatBudgetSummary(response),
           },
         ],
+        structuredContent: response,
       };
     },
   );