Integrations
LangGraph
Add authorization checkpoints to LangGraph workflows. Gate tool nodes, interrupt on human review, and resume graphs after approval.
Installation
terminal
npm install lelu-agent-auth @langchain/langgraph
Authorization node
Add a Lelu node before any tool node to gate execution. The node reads the pending tool call from state, evaluates it, and routes to execute, block, or review.
graph.ts
import { StateGraph, Annotation } from "@langchain/langgraph";
import { createClient } from "lelu-agent-auth";
const lelu = createClient({ apiKey: process.env.LELU_API_KEY! });
const State = Annotation.Root({
tool: Annotation<string>(),
context: Annotation<string>(),
decision: Annotation<string>(),
result: Annotation<string>(),
});
async function leluGuard(state: typeof State.State) {
const { decision, reason } = await lelu.authorize({
tool: state.tool,
context: state.context,
});
return { decision, reason };
}
const graph = new StateGraph(State)
.addNode("agent", agentNode)
.addNode("lelu_guard", leluGuard)
.addNode("execute_tool", executeToolNode)
.addNode("blocked", blockedNode)
.addEdge("agent", "lelu_guard")
.addConditionalEdges("lelu_guard", (s) => s.decision, {
allow: "execute_tool",
deny: "blocked",
human_review: "execute_tool", // interrupted for approval
})
.compile({ interruptBefore: ["execute_tool"] }); // pause for human reviewResume after approval
approve.ts
// After human approves in your dashboard:
await graph.updateState(threadId, { decision: "allow" });
await graph.invoke(null, { configurable: { thread_id: threadId } });