diff --git a/examples/headless-langgraph-e2e/.env.example b/examples/headless-langgraph-e2e/.env.example
new file mode 100644
index 00000000000..2650deb237c
--- /dev/null
+++ b/examples/headless-langgraph-e2e/.env.example
@@ -0,0 +1,3 @@
+OPENAI_API_KEY=sk-...
+# Optional override (default: openai:gpt-4o-mini)
+# OPENAI_MODEL=openai:gpt-4o-mini
diff --git a/examples/headless-langgraph-e2e/.gitignore b/examples/headless-langgraph-e2e/.gitignore
new file mode 100644
index 00000000000..5cc8323767a
--- /dev/null
+++ b/examples/headless-langgraph-e2e/.gitignore
@@ -0,0 +1,7 @@
+.env
+.venv/
+__pycache__/
+*.egg-info/
+.langgraph_api/
+frontend/node_modules/
+frontend/dist/
diff --git a/examples/headless-langgraph-e2e/README.md b/examples/headless-langgraph-e2e/README.md
new file mode 100644
index 00000000000..b73f30d6000
--- /dev/null
+++ b/examples/headless-langgraph-e2e/README.md
@@ -0,0 +1,87 @@
+# Headless tool + LangGraph dev server (E2E)
+
+This example runs a **local LangGraph API** (`langgraph dev`) with a graph built via
+[`create_agent`](https://docs.langchain.com/oss/python/langchain/agents) and a **headless
+tool** from the branch (`langchain.tools.tool` with `name`, `description`, and
+`args_schema` only). The tool calls LangGraph `interrupt()` so you can handle execution in
+a browser or other client and **resume** with the result.
+
+## Prerequisites
+
+- [uv](https://docs.astral.sh/uv/)
+- An `OPENAI_API_KEY` in `.env` (the demo model defaults to `openai:gpt-4o-mini`)
+
+## 1. Configure environment
+
+```bash
+cd examples/headless-langgraph-e2e
+cp .env.example .env
+# Edit .env and set OPENAI_API_KEY
+```
+
+## 2. Install dependencies
+
+```bash
+uv sync --group dev
+```
+
+## 3. Start the LangGraph dev server
+
+Default API URL is `http://127.0.0.1:2024` (CORS allows `*` by default).
+
+```bash
+uv run langgraph dev --config langgraph.json --no-browser
+```
+
+The dev server listens on **port 2024** by default (see the banner for the exact API URL).
+
+### Port 2024 already in use
+
+Another process (often a previous `langgraph dev`) is bound to 2024. Either stop it or use a free port:
+
+```bash
+# See what is using 2024 (macOS / Linux)
+lsof -i :2024
+```
+
+Then quit that process, or start on another port:
+
+```bash
+uv run langgraph dev --config langgraph.json --no-browser --port 2025
+```
+
+Set the **LangGraph API base URL** in the frontend to match (for example `http://127.0.0.1:2025`).
+
+## 4. Run the React frontend (Vite + `useStream`)
+
+The UI mirrors the headless-tools pattern from `ui-playground` (`tool({ name, description, schema })` +
+`.implement(...)` passed to `useStream({ tools: [...] })`).
+
+In another shell:
+
+```bash
+cd examples/headless-langgraph-e2e/frontend
+npm install
+npm run dev
+```
+
+Open `http://127.0.0.1:8765`. The **LangGraph API base URL** field defaults to
+`http://127.0.0.1:2024`; change it if you used `--port` with a different value.
+
+Send a message that asks to open a URL or for your location; the model should call the
+matching headless tool, the client runs the implementation in `src/tools.ts`, and streaming
+continues after the tool result is applied.
+
+## Notes
+
+- **Checkpointer:** For a plain Python script you normally pass `checkpointer=InMemorySaver()`
+ to `create_agent` so `interrupt()` / headless tools persist. The **LangGraph dev server**
+ injects its own persistence and **rejects** a custom checkpointer on the graph, so this
+ example omits it.
+- **Studio:** The server banner prints a link to open **LangSmith Studio** against your
+ local API (useful for debugging the same graph).
+
+## Graph id
+
+The graph is registered as **`agent`** in `langgraph.json` (this is the assistant / graph
+id passed to the SDK).
diff --git a/examples/headless-langgraph-e2e/agent.py b/examples/headless-langgraph-e2e/agent.py
new file mode 100644
index 00000000000..d244fc0207d
--- /dev/null
+++ b/examples/headless-langgraph-e2e/agent.py
@@ -0,0 +1,65 @@
+"""LangGraph dev graph: `create_agent` with a headless (interrupting) tool.
+
+Headless tools (`browser_navigate`, `geolocation_get`) have no local implementation;
+they call LangGraph `interrupt()` so the client can execute them and resume with a result.
+
+Run the API: ``uv run langgraph dev`` from this directory (see README).
+"""
+
+from __future__ import annotations
+
+import os
+
+from langchain.agents import create_agent
+from langchain.tools import tool
+from pydantic import BaseModel, Field
+
+# Model id for init_chat_model (requires OPENAI_API_KEY in .env for OpenAI models).
+_model = os.environ.get("OPENAI_MODEL", "openai:gpt-4o-mini")
+
+
+class BrowserNavigateArgs(BaseModel):
+ """Arguments for the headless browser navigation tool."""
+
+ url: str = Field(..., description="URL to open in the headless browser.")
+
+
+class GeolocationGetArgs(BaseModel):
+ """Arguments for the headless geolocation tool."""
+
+ high_accuracy: bool | None = Field(
+ default=None,
+ description="If true, request high-accuracy GPS from the browser when supported.",
+ )
+
+
+browser_navigate = tool(
+ name="browser_navigate",
+ description=(
+ "Navigate a headless browser to a URL. Execution is delegated to the client: "
+ "the graph pauses until the client resumes with the page result."
+ ),
+ args_schema=BrowserNavigateArgs,
+)
+
+geolocation_get = tool(
+ name="geolocation_get",
+ description=(
+ "Get the user's current GPS coordinates using the browser Geolocation API. "
+ "The client shows their position on a map (OpenStreetMap). "
+ "The browser may prompt for permission the first time."
+ ),
+ args_schema=GeolocationGetArgs,
+)
+
+graph = create_agent(
+ _model,
+ tools=[browser_navigate, geolocation_get],
+ system_prompt=(
+ "You are a helpful assistant. When the user asks to open, visit, or browse "
+ "a URL, call browser_navigate with that URL. When they ask where they are, "
+ "their location, or to show them on a map, call geolocation_get. "
+ "After the client returns out-of-process results, reply briefly using that information."
+ ),
+ # No custom checkpointer: LangGraph API (`langgraph dev`) supplies persistence.
+)
diff --git a/examples/headless-langgraph-e2e/frontend/index.html b/examples/headless-langgraph-e2e/frontend/index.html
new file mode 100644
index 00000000000..4396163dfff
--- /dev/null
+++ b/examples/headless-langgraph-e2e/frontend/index.html
@@ -0,0 +1,12 @@
+
+
+
+
+
+ Headless tool demo
+
+
+
+
+
+
diff --git a/examples/headless-langgraph-e2e/frontend/package-lock.json b/examples/headless-langgraph-e2e/frontend/package-lock.json
new file mode 100644
index 00000000000..613317f9da0
--- /dev/null
+++ b/examples/headless-langgraph-e2e/frontend/package-lock.json
@@ -0,0 +1,1464 @@
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+ "lightningcss": "^1.32.0",
+ "picomatch": "^4.0.4",
+ "postcss": "^8.5.8",
+ "rolldown": "1.0.0-rc.12",
+ "tinyglobby": "^0.2.15"
+ },
+ "bin": {
+ "vite": "bin/vite.js"
+ },
+ "engines": {
+ "node": "^20.19.0 || >=22.12.0"
+ },
+ "funding": {
+ "url": "https://github.com/vitejs/vite?sponsor=1"
+ },
+ "optionalDependencies": {
+ "fsevents": "~2.3.3"
+ },
+ "peerDependencies": {
+ "@types/node": "^20.19.0 || >=22.12.0",
+ "@vitejs/devtools": "^0.1.0",
+ "esbuild": "^0.27.0",
+ "jiti": ">=1.21.0",
+ "less": "^4.0.0",
+ "sass": "^1.70.0",
+ "sass-embedded": "^1.70.0",
+ "stylus": ">=0.54.8",
+ "sugarss": "^5.0.0",
+ "terser": "^5.16.0",
+ "tsx": "^4.8.1",
+ "yaml": "^2.4.2"
+ },
+ "peerDependenciesMeta": {
+ "@types/node": {
+ "optional": true
+ },
+ "@vitejs/devtools": {
+ "optional": true
+ },
+ "esbuild": {
+ "optional": true
+ },
+ "jiti": {
+ "optional": true
+ },
+ "less": {
+ "optional": true
+ },
+ "sass": {
+ "optional": true
+ },
+ "sass-embedded": {
+ "optional": true
+ },
+ "stylus": {
+ "optional": true
+ },
+ "sugarss": {
+ "optional": true
+ },
+ "terser": {
+ "optional": true
+ },
+ "tsx": {
+ "optional": true
+ },
+ "yaml": {
+ "optional": true
+ }
+ }
+ },
+ "node_modules/zod": {
+ "version": "4.3.6",
+ "resolved": "https://registry.npmjs.org/zod/-/zod-4.3.6.tgz",
+ "integrity": "sha512-rftlrkhHZOcjDwkGlnUtZZkvaPHCsDATp4pGpuOOMDaTdDDXF91wuVDJoWoPsKX/3YPQ5fHuF3STjcYyKr+Qhg==",
+ "license": "MIT",
+ "funding": {
+ "url": "https://github.com/sponsors/colinhacks"
+ }
+ }
+ }
+}
diff --git a/examples/headless-langgraph-e2e/frontend/package.json b/examples/headless-langgraph-e2e/frontend/package.json
new file mode 100644
index 00000000000..5a085dc58d0
--- /dev/null
+++ b/examples/headless-langgraph-e2e/frontend/package.json
@@ -0,0 +1,24 @@
+{
+ "name": "headless-langgraph-e2e-frontend",
+ "private": true,
+ "type": "module",
+ "scripts": {
+ "dev": "vite --port 8765",
+ "build": "vite build",
+ "preview": "vite preview --port 8765"
+ },
+ "dependencies": {
+ "@langchain/react": "^0.3.2",
+ "langchain": "^1.3.0",
+ "react": "^19",
+ "react-dom": "^19",
+ "zod": "^4.3.6"
+ },
+ "devDependencies": {
+ "@types/react": "^19",
+ "@types/react-dom": "^19",
+ "@vitejs/plugin-react": "^6",
+ "typescript": "^5.8",
+ "vite": "^8"
+ }
+}
diff --git a/examples/headless-langgraph-e2e/frontend/src/App.tsx b/examples/headless-langgraph-e2e/frontend/src/App.tsx
new file mode 100644
index 00000000000..7722fa7e1ad
--- /dev/null
+++ b/examples/headless-langgraph-e2e/frontend/src/App.tsx
@@ -0,0 +1,243 @@
+import { useCallback, useMemo, useState, type ReactNode } from "react";
+import { AIMessage, HumanMessage } from "langchain";
+import {
+ useStream,
+ type DefaultToolCall,
+ type ToolCallWithResult,
+} from "@langchain/react";
+
+import { LocationMap } from "./LocationMap";
+import { browserNavigateClient, geolocationGetClient } from "./tools";
+
+const ASSISTANT_ID = "agent";
+
+const PRESETS = [
+ "Please open https://example.com in the browser.",
+ "Visit https://langchain.com and tell me the page title if you can.",
+ "Where am I right now? Show me on a map.",
+];
+
+function parseResultContent(result: ToolCallWithResult["result"]): unknown {
+ if (!result) return undefined;
+ const c = result.content;
+ const raw = typeof c === "string" ? c : JSON.stringify(c);
+ try {
+ return JSON.parse(raw) as unknown;
+ } catch {
+ return raw;
+ }
+}
+
+function HeadlessToolCallCard({
+ toolCall,
+}: {
+ toolCall: ToolCallWithResult;
+}) {
+ const { call, result, state } = toolCall;
+ const pending = state === "pending";
+ const parsed = parseResultContent(result);
+
+ const title =
+ call.name === "geolocation_get"
+ ? "geolocation_get"
+ : call.name === "browser_navigate"
+ ? "browser_navigate"
+ : call.name;
+
+ const icon =
+ call.name === "geolocation_get" ? "📍" : call.name === "browser_navigate" ? "🌐" : "🔧";
+
+ let map: ReactNode = null;
+ if (
+ call.name === "geolocation_get" &&
+ parsed &&
+ typeof parsed === "object" &&
+ parsed !== null &&
+ "success" in parsed &&
+ (parsed as { success?: boolean }).success === true &&
+ "latitude" in parsed &&
+ "longitude" in parsed
+ ) {
+ const p = parsed as { latitude: number; longitude: number; accuracy?: number };
+ map = ;
+ }
+
+ let resultText = "";
+ if (result) {
+ const c = result.content;
+ resultText = typeof c === "string" ? c : JSON.stringify(c);
+ }
+
+ return (
+
+
+ {icon}
+ {pending ? `Running ${call.name}…` : title}
+
+
{JSON.stringify(call.args, null, 2)}
+ {map}
+ {resultText ? (
+
+ {map ? "---\n" : ""}
+ {resultText}
+
+ ) : null}
+
+ );
+}
+
+export function App() {
+ const [apiUrl, setApiUrl] = useState("http://127.0.0.1:2024");
+
+ const tools = useMemo(() => [browserNavigateClient, geolocationGetClient], []);
+
+ const stream = useStream({
+ apiUrl: apiUrl.replace(/\/$/, ""),
+ assistantId: ASSISTANT_ID,
+ tools,
+ });
+
+ const handleSubmit = useCallback(
+ (text: string) => {
+ void stream.submit({
+ messages: [{ type: "human" as const, content: text }],
+ });
+ },
+ [stream],
+ );
+
+ return (
+ <>
+ Headless tool (useStream)
+
+ Start the graph API from the parent directory:{" "}
+ uv run langgraph dev --config langgraph.json --no-browser. Tool name{" "}
+ browser_navigate and geolocation_get match agent.py
+ ; the client runs implementations passed to useStream (see{" "}
+ ui-playground/.../headless-tools). Geolocation uses OpenStreetMap embeds.
+
+
+
+
+ LangGraph API base URL
+ {
+ setApiUrl(e.target.value);
+ }}
+ autoComplete="off"
+ />
+
+ {stream.messages.length > 0 ? (
+
{
+ stream.switchThread(null);
+ }}
+ >
+ New thread
+
+ ) : null}
+
+
+ Message
+