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March 18, 2026 · New York City

Writing our own JavaScript for "Code Mode" MCP

Learn how to build secure JavaScript runtimes in Rust for LLM code, including TypeScript type checking and an MCP client, using Deno for sandboxing.

Overview

How we built two javascript runtimes in Rust using the “Deno” crate.

How we embedded typescript instant type checking of LLM generated code
How we embedded a Rust MCP client
How we lean on Deno configurations for sandboxing rules

Links

Tech stack