feat(langgraph-ts): AG-UI StreamTransformer (v3 protocol path) for all demos

apps/dojo/scripts/run-dojo-everything.js

@@ -4,9 +4,11 @@ const { execSync } = require("child_process");
 const path = require("path");
 const concurrently = require("concurrently");
 
-// Pinned: @langchain/langgraph-api@1.1.14 regressed schema extraction, causing
-// worker timeouts on CI runners. Re-evaluate when a newer version fixes the issue.
-const LANGGRAPH_CLI_VERSION = "1.1.13";
+// 1.2.1 ships the v3 thread-stream protocol (POST /threads/:tid/commands,
+// /stream/events, etc.) that the AG-UI transformer path depends on.
+// 1.1.13 returned 404 on those routes. Re-evaluate if the schema-extraction
+// regressions that prompted the original 1.1.13 pin resurface.
+const LANGGRAPH_CLI_VERSION = "1.2.1";
 
 // Parse command line arguments
 const args = process.argv.slice(2);

apps/dojo/src/agents.ts

@@ -198,9 +198,14 @@ export const agentsIntegrations = {
   "langgraph-typescript": async () =>
     mapAgents(
       (graphId) => {
+        // All TS demos register the AG-UI streamTransformer at compile;
+        // route every one through the transformer path. The legacy
+        // translation in agent.ts is preserved for non-langgraph
+        // deployments via `useTransformer: false`.
         return new LangGraphAgent({
           deploymentUrl: envVars.langgraphTypescriptUrl,
           graphId,
+          useTransformer: true,
         });
       },
       {

apps/dojo/src/app/[integrationId]/feature/(v2)/tool_based_generative_ui/page.tsx

@@ -94,13 +94,14 @@ function HaikuDisplay() {
   useFrontendTool(
     {
       agentId: "tool_based_generative_ui",
+      description: "Generates a haiku with Japanese and English translations, an image name, and a CSS gradient for the background.",
       name: "generate_haiku",
        parameters: z.object({
         japanese: z.array(z.string()).describe("3 lines of haiku in Japanese"),
         english: z.array(z.string()).describe("3 lines of haiku translated to English"),
         image_name: z.string().describe(`One relevant image name from: ${VALID_IMAGE_NAMES.join(", ")}`),
         gradient: z.string().describe("CSS Gradient color for the background"),
-      })  ,
+      }),
       followUp: false,
       handler: async ({ japanese, english, image_name, gradient }: { japanese: string[]; english: string[]; image_name: string; gradient: string }) => {
         const newHaiku: Haiku = {

integrations/langgraph/typescript/examples/package.json

@@ -5,18 +5,19 @@
   "type": "module",
   "scripts": {
     "build": "tsc",
-    "dev": "pnpx @langchain/langgraph-cli@1.1.13 dev",
+    "dev": "pnpx @langchain/langgraph-cli@1.2.1 dev",
     "start": "node dist/index.js"
   },
   "dependencies": {
-    "@copilotkit/sdk-js": "0.0.0-mme-ag-ui-0-0-46-20260227141603",
-    "@langchain/core": "^1.1.7",
-    "@langchain/anthropic": "^0.3.0",
-    "@langchain/google-genai": "^0.2.0",
-    "@langchain/openai": "^1.2.0",
-    "@langchain/langgraph": "^1.0.7",
+    "@ag-ui/langgraph": "link:../",
+    "@copilotkit/sdk-js": "1.57.0",
+    "@langchain/core": "^1.1.45",
+    "@langchain/anthropic": "^1.3.28",
+    "@langchain/google-genai": "^1.0.0",
+    "@langchain/openai": "^1.4.5",
+    "@langchain/langgraph": "^1.3.0",
     "dotenv": "^16.4.5",
-    "langchain": "^1.2.3",
+    "langchain": "^1.4.0",
     "uuid": "^10.0.0"
   },
   "devDependencies": {