From 5973fea2967db01d6c840b0681563b33adaa17c2 Mon Sep 17 00:00:00 2001 From: Christian Bromann Date: Fri, 3 Apr 2026 23:16:22 -0700 Subject: [PATCH] add demo --- examples/headless-langgraph-e2e/.env.example | 3 + examples/headless-langgraph-e2e/.gitignore | 7 + examples/headless-langgraph-e2e/README.md | 87 + examples/headless-langgraph-e2e/agent.py | 65 + .../frontend/index.html | 12 + .../frontend/package-lock.json | 1464 +++++++++++ .../frontend/package.json | 24 + .../frontend/src/App.tsx | 243 ++ .../frontend/src/LocationMap.tsx | 40 + .../frontend/src/index.css | 181 ++ .../frontend/src/main.tsx | 16 + .../frontend/src/tools.ts | 97 + .../frontend/tsconfig.json | 20 + .../frontend/vite.config.ts | 9 + .../headless-langgraph-e2e/langgraph.json | 8 + .../headless-langgraph-e2e/pyproject.toml | 24 + examples/headless-langgraph-e2e/uv.lock | 2241 +++++++++++++++++ 17 files changed, 4541 insertions(+) create mode 100644 examples/headless-langgraph-e2e/.env.example create mode 100644 examples/headless-langgraph-e2e/.gitignore create mode 100644 examples/headless-langgraph-e2e/README.md create mode 100644 examples/headless-langgraph-e2e/agent.py create mode 100644 examples/headless-langgraph-e2e/frontend/index.html create mode 100644 examples/headless-langgraph-e2e/frontend/package-lock.json create mode 100644 examples/headless-langgraph-e2e/frontend/package.json create mode 100644 examples/headless-langgraph-e2e/frontend/src/App.tsx create mode 100644 examples/headless-langgraph-e2e/frontend/src/LocationMap.tsx create mode 100644 examples/headless-langgraph-e2e/frontend/src/index.css create mode 100644 examples/headless-langgraph-e2e/frontend/src/main.tsx create mode 100644 examples/headless-langgraph-e2e/frontend/src/tools.ts create mode 100644 examples/headless-langgraph-e2e/frontend/tsconfig.json create mode 100644 examples/headless-langgraph-e2e/frontend/vite.config.ts create mode 100644 examples/headless-langgraph-e2e/langgraph.json create mode 100644 examples/headless-langgraph-e2e/pyproject.toml create mode 100644 examples/headless-langgraph-e2e/uv.lock 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 + + +
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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 ( +
+
+ + {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. +

+ +
+
+ + { + setApiUrl(e.target.value); + }} + autoComplete="off" + /> +
+ {stream.messages.length > 0 ? ( + + ) : null} +
+ + +