Jcode

ActiveAI-native

The harness company

What it does

An agent is LLM + harness: We work purely on that second component. We do research to produce the most capable harness for coding, and we also make an open source, terminal based, coding agent product with 18k github stars.

Its site says now · captured 2026-08-23

jcode - open-source AI coding agent for the terminal

jcode is an open-source AI coding agent for the terminal, written in Rust. Durable memory, background tasks, and agent swarms, installed with one command.

Next to it in Developer tools · AI coding agents for parallelized development

  • SupersetY Combinator X26

    Building self-improving software

  • OpenSpecY Combinator W26

    Plan mode for complex features

  • cmuxY Combinator S24

    Open source applied AI lab building next-gen devtools

  • EmbedderY Combinator S25

    Hardware-Aware AI for Embedded Software Development

  • WozY Combinator W25

    Claude Code plugin that reduces token consumption and cost by 50%

  • FreebuffY Combinator F24

    The free coding agent

  • ContinueY Combinator S23

    Pioneering open-source coding agent

  • GladeY Combinator S23

    Build games at the speed of thought