LangChain Reference home page

GitHub
Main Docs

Overview
Agent
Middleware
Backends
Sandboxes
Skills
Subagents
Configuration
Types

Modal

Daytona

Deno

Node VFS

Sandbox Standard Tests

Vitest

⌘I

LangChain Assistant

Ask a question to get started

Enter to send•Shift+Enter new line

Menu

Overview Agent Middleware Backends Sandboxes Skills Subagents Configuration Types

Sandbox Standard Tests

Language

Theme

JavaScriptdeepagentsbackends.CompositeBackend.constructor

Symbol Not Found

The symbol backends.CompositeBackend.constructor was not found in deepagents.