mcp-js
Active·★ 62·AGPL-3.0·Updated 2026-10-20
mcp-v8 provides a secure and efficient JavaScript/TypeScript runtime for AI agents, allowing them to execute code within a sandboxed V8 isolate. It simplifies agent development by offering a single, powerful `run_js` tool instead of multiple narrow utilities, supporting durable state and policy-gated capabilities.
#JavaScript Runtime#TypeScript Runtime#AI Agent Development#V8 Engine#Sandboxing#Security Policies#Model Context Protocol#API Integration
01
Features
01JavaScript & TypeScript execution in a sandboxed V8 isolate
02Durable state with content-addressed V8 heap snapshots
03Secure by default with configurable policy-gated capabilities
04Simplifies AI agent development with a single `run_js` tool for complex logic
05Production-ready with authentication, clustering, and multiple transport options
02
Compatibility
Linux x86_64
OS
Verified via docs
Linux arm64
OS
Verified via docs
macOS Apple Silicon
OS
Verified via docs
Docker
Container
Verified via docs
Nix
Package Manager
Verified via docs
03
Quick start
1
$ curl -fsSL https://raw.githubusercontent.com/r33drichards/mcp-js/main/install.sh | sudo bash
04
Use cases
↳Enabling AI agents to execute complex, procedural logic (loops, branches, data transformations)
↳Developing stateful AI agents that persist context and variables across interactions
↳Securely orchestrating external tools and APIs for agents with fine-grained access policies
↳Building extensible AI agent tools by composing other Model Context Protocol (MCP) servers
05
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