An AI agent is artificial intelligence that automatically performs specific tasks without human intervention. Until now, AI coding agents were a market that individuals found hard to access, because they were at a disadvantage in terms of capital, manpower, and data.
Anthropic raised billions of dollars and released Claude Code, an AI coding tool, and OpenAI also introduced the coding agent Codex. Amid this, a recent shift has taken place in the developer community. A single Korean developer has shaken up this market. It is Kim Yeon-gyu, an AI agent engineer at Indent Corporation, which provides an AI-based review marketing solution.
Oh My OpenCode, which Kim created and drew attention for, is an extension plugin built on the open-source AI coding agent Open Code. Like smartphone apps, the plugin expands functionality—just as installing various apps on a basic smartphone enables gaming, photo editing, and navigation.
Oh My OpenCode is a tool that lets a developer run multiple AI agents in parallel in the background to divide and complete tasks like a real development team. It orchestrates multiple AI models to collaborate according to their areas of expertise. For example, the main agent takes the role of the development team lead, understands the task, and calls the appropriate AI models. If architecture design is needed, it calls a GPT strong in logic; if codebase analysis is needed, it calls Claude, which excels at understanding context. It hands off frontend work to Gemini, which is outstanding at generating user interfaces (UI). All of this runs in parallel in the background. And it does not stop until the work is complete.
Engineer Kim Yeon-gyu did not build Oh My OpenCode from scratch alone. Oh My OpenCode made active use of Open Code, an AI coding agent developed by the Serverless Stack (SST) team at anomaly innovations, a software development company headquartered in San Francisco. Open Code is 100% open source. It is not tied to a specific AI and supports more than 75 AI models, including Claude, GPT, and Gemini. It is similar in concept to Anthropic Claude Code, but it is free and its source code is open. More than 300,000 developers use it monthly, and it has earned more than 30,000 stars on GitHub. SST is said to have received investment from the founders of LinkedIn, BitTorrent, and Hot or Not.
Engineer Kim Yeon-gyu leveraged an existing open-source AI coding agent to single-handedly create a powerful plugin with industry-wide impact. Users' reactions have been positive. "If Claude Code did in 7 days what takes a person 3 months, Oh My OpenCode did it in 1 hour. It keeps running and does not stop until the work is finished." "Something unbelievable is happening in the open-source community." "It has sparked a revolution in the Open Code industry." In effect, Kim created a methodology in AI coding agents called an orchestration strategy.
Oh My OpenCode has surpassed 15,200 GitHub stars, a measure of popularity on the code-sharing platform GitHub. GitHub stars let users express interest and function similarly to bookmarks, but in the development ecosystem they mean more than a simple like. When developers find a project they consider interesting or useful, they star it to save it and later easily find it again or track updates.
As Oh My OpenCode spread by word of mouth, Anthropic placed some restrictions on indirect use of Claude Code within Oh My OpenCode. Engineer Kim Yeon-gyu said, "I wrote on my LinkedIn profile, 'Your productivity might go up too much, so be careful not to let the colleague next to you notice you're using Oh My OpenCode,' but Anthropic noticed."
Engineer Kim Yeon-gyu defined a good agent harness in AI development as "something that does not require human intervention." A harness refers to a system or framework to control and manage AI models efficiently and reliably. Kim said, "Ultimately, code written by an agent should be indistinguishable from code written by a person, and in that process, a person should not need to be involved at all," adding, "Human intervention is precisely the bottleneck we need to solve."
Lee Kyung-hoon, chief artificial intelligence officer (CAIO) at Channel Corporation, said, "In the past, it would have taken a team's manpower and months to build base infrastructure, but open-source platforms have provided the foundation for the gaps," adding, "A plugin created by a single developer has had a ripple effect in the AI coding agent market, long seen as the realm of big tech, and that plugin has enabled a single developer to replace an entire team." He said, "We have entered an era in which one AI talent or a small organization can flip the market at any time."