fix(core): expose MCP output schemas to code mode (#35502)

packages/core/test/fixture/mcp-output-schema.ts

@@ -0,0 +1,40 @@
+import { Server } from "@modelcontextprotocol/sdk/server/index.js"
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js"
+import { ListToolsRequestSchema } from "@modelcontextprotocol/sdk/types.js"
+
+const server = new Server({ name: "output-schema", version: "1.0.0" }, { capabilities: { tools: {} } })
+
+server.setRequestHandler(ListToolsRequestSchema, ({ params }) =>
+  Promise.resolve(
+    params?.cursor === "page-2"
+      ? {
+          tools: [
+            {
+              name: "second",
+              inputSchema: { type: "object" },
+              outputSchema: {
+                type: "object",
+                properties: { value: { type: "number" } },
+                required: ["value"],
+              },
+            },
+          ],
+        }
+      : {
+          tools: [
+            {
+              name: "first",
+              inputSchema: { type: "object" },
+              outputSchema: {
+                type: "object",
+                properties: { value: { type: "string" } },
+                required: ["value"],
+              },
+            },
+          ],
+          nextCursor: "page-2",
+        },
+  ),
+)
+
+await server.connect(new StdioServerTransport())