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# Remote Execution & Advanced Features
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Distributed graph execution, schema integration, and advanced streaming capabilities for complex multi-system workflows and enterprise integrations.
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## Capabilities
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### Remote Graph Execution
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Execute LangGraph workflows on remote services with transparent local interface for distributed computing scenarios.
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```typescript { .api }
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/**
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 * Graph that executes on a remote LangGraph service
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 */
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class RemoteGraph {
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  constructor(params: RemoteGraphParams);
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  /** Execute graph on remote service */
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  invoke(
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    input: any,
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    config?: LangGraphRunnableConfig
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  ): Promise<any>;
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  /** Stream execution from remote service */
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  stream(
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    input: any,
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    config?: LangGraphRunnableConfig
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  ): AsyncIterableIterator<any>;
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  /** Batch execute on remote service */
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  batch(
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    inputs: any[],
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    config?: LangGraphRunnableConfig | LangGraphRunnableConfig[]
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  ): Promise<any[]>;
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  /** Get state from remote graph */
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  getState(config: LangGraphRunnableConfig): Promise<StateSnapshot>;
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  /** Update state on remote graph */
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  updateState(
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    config: LangGraphRunnableConfig,
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    values: any,
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    asNode?: string
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  ): Promise<void>;
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}
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interface RemoteGraphParams {
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  /** Remote service URL */
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  url: string;
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  /** Graph name on remote service */
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  graphName: string;
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  /** Authentication configuration */
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  auth?: {
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    type: "apiKey" | "bearer" | "basic";
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    token?: string;
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    username?: string;
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    password?: string;
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  };
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  /** Connection timeout */
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  timeout?: number;
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  /** Retry configuration */
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  retry?: {
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    attempts: number;
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    backoff: "linear" | "exponential";
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    delay: number;
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  };
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  /** Custom headers */
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  headers?: Record<string, string>;
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}
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```
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**Usage Example:**
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```typescript
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import { RemoteGraph } from "@langchain/langgraph/remote";
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const remoteGraph = new RemoteGraph({
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  url: "https://api.langgraph.com",
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  graphName: "document-processor",
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  auth: {
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    type: "apiKey",
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    token: process.env.LANGGRAPH_API_KEY
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  },
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  timeout: 30000,
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  retry: {
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    attempts: 3,
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    backoff: "exponential",
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    delay: 1000
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  }
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});
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// Use like any local graph
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const result = await remoteGraph.invoke(
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  { document: documentData },
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  { configurable: { thread_id: "remote-session-1" } }
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);
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// Stream from remote
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for await (const chunk of remoteGraph.stream(input)) {
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  console.log("Remote chunk:", chunk);
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}
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```
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## Schema Integration
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### Zod Schema Extraction
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Extract JSON schemas from compiled graphs for validation, documentation, and API generation.
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```typescript { .api }
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/**
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 * Extract state type schema from a graph
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 */
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function getStateTypeSchema(graph: unknown): JSONSchema | undefined;
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/**
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 * Extract update type schema from a graph
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 */
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function getUpdateTypeSchema(graph: unknown): JSONSchema | undefined;
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/**
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 * Extract input type schema from a graph
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 */
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function getInputTypeSchema(graph: unknown): JSONSchema | undefined;
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/**
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 * Extract output type schema from a graph
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 */
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function getOutputTypeSchema(graph: unknown): JSONSchema | undefined;
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/**
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 * Extract configuration type schema from a graph
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 */
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function getConfigTypeSchema(graph: unknown): JSONSchema | undefined;
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interface JSONSchema {
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  type: string;
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  properties?: Record<string, JSONSchema>;
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  required?: string[];
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  items?: JSONSchema;
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  additionalProperties?: boolean | JSONSchema;
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  enum?: any[];
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  [key: string]: any;
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}
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```
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**Usage Example:**
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```typescript
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import {
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  getStateTypeSchema,
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  getInputTypeSchema,
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  getOutputTypeSchema
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} from "@langchain/langgraph/zod";
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const graph = new StateGraph(MyAnnotation)
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  .addNode("process", processNode)
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  .compile();
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// Extract schemas
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const stateSchema = getStateTypeSchema(graph);
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const inputSchema = getInputTypeSchema(graph);
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const outputSchema = getOutputTypeSchema(graph);
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// Use schemas for validation
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function validateInput(input: unknown): boolean {
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  return validateAgainstSchema(input, inputSchema);
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}
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// Generate API documentation
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const apiDocs = {
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  endpoints: {
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    "/invoke": {
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      input: inputSchema,
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      output: outputSchema
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    }
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  },
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  stateStructure: stateSchema
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};
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```
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### Schema Registry
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Registry system for managing and accessing schema metadata across applications.
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```typescript { .api }
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/**
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 * Registry for schema metadata
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 */
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class SchemaMetaRegistry {
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  /** Register schema metadata */
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  register(key: string, metadata: SchemaMeta): void;
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  /** Retrieve schema metadata */
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  get(key: string): SchemaMeta | undefined;
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  /** List all registered schemas */
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  list(): string[];
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  /** Clear registry */
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  clear(): void;
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}
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/**
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 * Global schema registry instance
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 */
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const schemaMetaRegistry: SchemaMetaRegistry;
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interface SchemaMeta {
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  title?: string;
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  description?: string;
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  version?: string;
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  tags?: string[];
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  examples?: any[];
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  deprecated?: boolean;
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}
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```
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**Usage Example:**
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```typescript
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import { schemaMetaRegistry } from "@langchain/langgraph/zod/schema";
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// Register schema metadata
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schemaMetaRegistry.register("UserState", {
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  title: "User State Schema",
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  description: "State structure for user management workflows",
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  version: "1.0.0",
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  tags: ["user", "state"],
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  examples: [
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    { userId: "123", name: "John Doe", active: true }
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  ]
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});
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// Retrieve and use metadata
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const userStateMeta = schemaMetaRegistry.get("UserState");
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if (userStateMeta && !userStateMeta.deprecated) {
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  console.log(`Using ${userStateMeta.title} v${userStateMeta.version}`);
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}
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```
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## Advanced Streaming
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### Custom Stream Modes
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Implement custom streaming modes for specialized output formats and processing patterns.
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```typescript
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interface CustomStreamMode {
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  name: string;
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  transformer: (chunk: any) => any;
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  aggregator?: (chunks: any[]) => any;
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}
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// Custom streaming for metrics
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const metricsStream: CustomStreamMode = {
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  name: "metrics",
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  transformer: (chunk) => ({
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    timestamp: Date.now(),
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    nodeMetrics: extractMetrics(chunk),
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    performance: calculatePerformance(chunk)
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  }),
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  aggregator: (chunks) => ({
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    totalExecution: chunks.length,
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    averagePerformance: chunks.reduce((sum, c) => sum + c.performance, 0) / chunks.length,
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    timeline: chunks.map(c => ({ time: c.timestamp, metrics: c.nodeMetrics }))
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  })
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};
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// Usage with custom stream mode
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for await (const metrics of graph.stream(input, {
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  streamMode: "custom",
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  customMode: metricsStream
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})) {
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  updateDashboard(metrics);
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}
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```
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### Stream Filtering and Transformation
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Advanced stream processing for filtering and transforming streaming output.
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```typescript
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// Stream with filtering
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async function* filteredStream(
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  graph: CompiledGraph,
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  input: any,
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  filter: (chunk: any) => boolean
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) {
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  for await (const chunk of graph.stream(input)) {
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    if (filter(chunk)) {
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      yield chunk;
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    }
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  }
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}
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// Stream with transformation
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async function* transformedStream(
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  graph: CompiledGraph,
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  input: any,
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  transformer: (chunk: any) => any
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) {
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  for await (const chunk of graph.stream(input)) {
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    yield transformer(chunk);
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  }
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}
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// Buffered streaming
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async function* bufferedStream(
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  graph: CompiledGraph,
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  input: any,
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  bufferSize: number
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) {
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  const buffer = [];
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  for await (const chunk of graph.stream(input)) {
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    buffer.push(chunk);
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    if (buffer.length >= bufferSize) {
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      yield buffer.splice(0, bufferSize);
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    }
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  }
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  if (buffer.length > 0) {
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    yield buffer;
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  }
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}
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```
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## Performance Optimization
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### Caching and Memoization
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Built-in caching mechanisms for improving performance of repeated operations.
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```typescript
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interface CacheConfig {
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  /** Cache key generation strategy */
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  keyStrategy: "input" | "state" | "custom";
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  /** Custom key generator */
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  keyGenerator?: (input: any) => string;
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  /** Cache TTL in milliseconds */
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  ttl?: number;
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  /** Maximum cache size */
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  maxSize?: number;
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  /** Cache storage backend */
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  storage?: "memory" | "disk" | "redis";
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}
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// Node with caching
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const cachedNode = withCache(
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  {
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    keyStrategy: "input",
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    ttl: 300000, // 5 minutes
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    maxSize: 1000
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  },
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  async (state) => {
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    // Expensive operation
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    return await processExpensiveOperation(state);
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  }
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);
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```
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### Parallel Execution Optimization
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Optimize parallel execution patterns for maximum performance.
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```typescript
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// Parallel node execution with concurrency control
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const parallelProcessor = async (state: State) => {
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  const tasks = state.items.map(item => processItem(item));
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  // Control concurrency
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  const results = await Promise.allSettled(
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    limitConcurrency(tasks, 5) // Max 5 concurrent operations
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  );
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  return {
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    results: results.map(r => r.status === "fulfilled" ? r.value : null),
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    errors: results.filter(r => r.status === "rejected").map(r => r.reason)
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  };
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};
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// Dynamic resource allocation
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const adaptiveProcessor = async (state: State) => {
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  const systemLoad = await getSystemLoad();
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  const concurrency = systemLoad < 0.7 ? 10 : 3;
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  return await processWithConcurrency(state.data, concurrency);
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};
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```
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### Memory Management
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Advanced memory management for large-scale graph execution.
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```typescript
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interface MemoryConfig {
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  /** Maximum memory per execution */
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  maxMemoryPerExecution?: number;
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  /** Garbage collection strategy */
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  gcStrategy?: "aggressive" | "conservative" | "adaptive";
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  /** Memory monitoring */
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  monitoring?: {
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    enabled: boolean;
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    thresholds: {
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      warning: number;
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      critical: number;
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    };
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  };
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}
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// Memory-aware graph compilation
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const memoryOptimizedGraph = graph.compile({
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  memoryConfig: {
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    maxMemoryPerExecution: 512 * 1024 * 1024, // 512MB
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    gcStrategy: "adaptive",
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    monitoring: {
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      enabled: true,
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      thresholds: {
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        warning: 0.8,
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        critical: 0.95
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      }
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    }
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  }
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});
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```
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## Enterprise Integration
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### Authentication and Authorization
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Enterprise-grade authentication and authorization for graph execution.
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```typescript
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interface AuthConfig {
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  /** Authentication provider */
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  provider: "oauth2" | "saml" | "ldap" | "custom";
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  /** Provider configuration */
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  config: Record<string, any>;
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  /** Role-based access control */
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  rbac?: {
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    roles: string[];
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    permissions: Record<string, string[]>;
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  };
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  /** Audit logging */
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  audit?: {
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    enabled: boolean;
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    logLevel: "minimal" | "detailed";
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  };
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}
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// Authenticated graph execution
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const authenticatedGraph = graph.compile({
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  auth: {
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    provider: "oauth2",
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    config: {
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      clientId: process.env.OAUTH_CLIENT_ID,
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      clientSecret: process.env.OAUTH_CLIENT_SECRET,
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      tokenEndpoint: "https://auth.company.com/token"
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    },
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    rbac: {
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      roles: ["admin", "user", "viewer"],
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      permissions: {
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        admin: ["read", "write", "execute"],
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        user: ["read", "execute"],
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        viewer: ["read"]
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      }
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    }
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  }
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});
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```
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### Monitoring and Observability
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Comprehensive monitoring and observability for production deployments.
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```typescript
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interface ObservabilityConfig {
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  /** Metrics collection */
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  metrics?: {
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    enabled: boolean;
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    provider: "prometheus" | "datadog" | "custom";
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    labels?: Record<string, string>;
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  };
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  /** Distributed tracing */
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  tracing?: {
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    enabled: boolean;
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    provider: "jaeger" | "zipkin" | "opentelemetry";
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    samplingRate?: number;
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  };
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  /** Logging configuration */
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  logging?: {
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    level: "debug" | "info" | "warn" | "error";
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    structured: boolean;
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    destination?: "console" | "file" | "remote";
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  };
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}
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// Observable graph
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const observableGraph = graph.compile({
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  observability: {
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    metrics: {
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      enabled: true,
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      provider: "prometheus",
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      labels: { service: "document-processor", version: "1.0.0" }
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    },
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    tracing: {
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      enabled: true,
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      provider: "jaeger",
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      samplingRate: 0.1
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    },
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    logging: {
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      level: "info",
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      structured: true,
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      destination: "remote"
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    }
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  }
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});
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```
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### Multi-Tenant Support
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Support for multi-tenant deployments with isolation and resource management.
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```typescript
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interface MultiTenantConfig {
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  /** Tenant isolation strategy */
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  isolation: "namespace" | "database" | "instance";
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  /** Resource limits per tenant */
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  limits?: {
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    maxConcurrentExecutions?: number;
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    maxMemoryPerTenant?: number;
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    maxExecutionTime?: number;
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  };
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  /** Tenant authentication */
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  tenantAuth?: {
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    enabled: boolean;
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    strategy: "header" | "subdomain" | "path";
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    validation: (tenantId: string) => Promise<boolean>;
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  };
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}
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// Multi-tenant graph
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const multiTenantGraph = graph.compile({
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  multiTenant: {
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    isolation: "namespace",
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    limits: {
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      maxConcurrentExecutions: 10,
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      maxMemoryPerTenant: 1024 * 1024 * 1024, // 1GB
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      maxExecutionTime: 300000 // 5 minutes
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    },
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    tenantAuth: {
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      enabled: true,
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      strategy: "header",
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      validation: async (tenantId) => {
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        return await validateTenant(tenantId);
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      }
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    }
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  }
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});
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```