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Status notice

LangChain Sandbox (discontinued)

Answer in brief

LangChain has archived the langchain-sandbox repository and says the package is no longer maintained. Closest alternatives: Pyodide, LLM Sandbox, just-bash.

By the Agent Sandboxes editors · Updated

Status: LangChain has archived the langchain-sandbox repository and says the package is no longer maintained.

Overview

LangChain Sandbox is a Python package that executes model-generated Python inside Pyodide, the WebAssembly build of CPython, hosted by a Deno process. The Python side (sandbox-py) spawns a TypeScript module (pyodide-sandbox-js) as a subprocess, so Deno must be installed; Deno permissions such as allow_net define the boundary. There is no filesystem bridge, and stateful runs are carried as pickled session bytes between calls.

The repository is archived and read-only. The README states "This package is no longer maintained" and "We do not recommend using langchain-sandbox for any production use cases". It remains a compact, MIT-licensed example of the Pyodide-in-Deno approach.

Notable

  • README: "This package is no longer maintained"; repository archived and read-only
  • README: "There is a few seconds of latency when starting the sandbox per run"

How LangChain Sandbox compares

SandboxIsolationOpen sourceSelf-host / BYOCCold start (vendor)Max sessionSnapshots / pauseGPUSDKs
LangChain SandboxPyodide in DenoYesYes / Noa few secondsNot documentedNo / NoNoPython
PyodideCPython in WasmYesYes / NoNot documentedNot documentedNo / NoNoJavaScript/TypeScript, Python
LLM SandboxDocker/Podman/K8s containerYesYes / NoNot documentedNot documentedNo / Not documentedNot documentedPython, MCP server
just-bashIn-process interpreterYesYes / NoNot documentedNot documentedNo / NoNoJavaScript/TypeScript
WasmtimeWasm sandboxYesYes / NoNot documentedEmbedder-setNo / Not documentedNoCLI, Rust, C, C++, Python, .NET, Go, Ruby

See all LangChain Sandbox alternatives →

Frequently asked questions

What is LangChain Sandbox?
Archived Python package that runs untrusted Python in Pyodide (WebAssembly) inside a Deno subprocess; LangChain says it is no longer maintained. An archived proof of concept rather than a maintained sandbox; look at Pyodide or Deno Sandbox directly instead.
How does LangChain Sandbox isolate code?
LangChain Sandbox documents its isolation as: Pyodide (CPython compiled to WebAssembly) hosted by Deno in a subprocess; isolation depends on the Deno permissions granted, and broad grants can expose host resources.
Is LangChain Sandbox open source?
Yes (MIT). It can be self-hosted.
How much does LangChain Sandbox cost?
Free (MIT) Check the official pricing page for current rates.
What are the alternatives to LangChain Sandbox?
Common alternatives include Pyodide, LLM Sandbox, just-bash, Wasmtime. See LangChain Sandbox alternatives for a full comparison.

Sources

  1. github.com/langchain-ai/langchain-sandbox

Cite this page

Agent Sandboxes. (2026). LangChain Sandbox (discontinued). agentsandboxes.org. Last reviewed November 9, 2026. https://agentsandboxes.org/sandboxes/langchain-sandbox/

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