# jcode: The Rust-Native Agent Harness for Multi-Session Development > Source: > Published: 2026-07-22 19:49:19+00:00 As AI coding assistants mature, developers are moving beyond simple chat interfaces. The new standard is running multiple autonomous agents in parallel—for instance, running one agent to refactor a class, another to write unit tests, and a third to update documentation. However, running multiple agent sessions concurrently can quickly consume your machine's RAM and slow down execution. **jcode** is an open-source coding agent harness built in **pure Rust** to solve this exact performance bottleneck. Designed specifically for multi-session workflows and customizability, it allows developers to spin up parallel agent loops locally with near-zero resource overhead. `jcode` functions as an orchestration layer for local coding agents. Bypassing heavy Node.js or Python environments, it provides a lightweight C/Rust-based execution harness. Developers can initialize multiple session tracks directly from their shell, feeding separate context windows to different LLMs to handle parallel sub-tasks. The core feature of `jcode` is its multi-session architecture. It coordinates 10+ parallel agent streams smoothly, letting developers delegate separate components of a build task to different model prompts simultaneously. Because it is written in Rust, `jcode` launches in milliseconds and has a tiny memory footprint. This makes it ideal for running on laptops and resource-constrained local dev machines. `jcode` is built for engineers who want total control over their agentic workflows. Rather than using locked-down, managed assistants, you can script how the agent operates, hook it into Git pipelines, and customize model parameters on a per-session basis. The tool lives completely inside the terminal, outputting clean diffs and task updates. It fits neatly into standard text editors, TMUX setups, and scripting pipelines. Installing `jcode` is simple. macOS users can tap and install via Homebrew: ``` brew tap 1jehuang/jcode brew install jcode ``` Alternatively, you can build it from source using Cargo or run the one-line install script: ``` curl -fsSL https://raw.githubusercontent.com/1jehuang/jcode/master/scripts/install.sh | bash ``` The future of software development involves orchestrating swarms of specialized coding agents. By providing a blazing-fast, memory-efficient, and highly customizable harness, `jcode` gives developers the infrastructure they need to build parallel AI workflows locally. *Ready to run coding agent swarms? Check out the jcode GitHub Repository.*