Andreessen Backs a Startup Developing Tools That Coding Agents Use

Countless startups sell tools to software engineers, such as version control systems to track who’s making changes to a codebase, and sandboxes where code can be safely run and tested without affecting the main system.

Now, a startup is building such tools for artificial intelligence agents that aim to do the work of human coders. Andreessen Horowitz, which has been among the most prolific backers of young AI startups in the last two years, just led a $23 million financing of the coding-tool startup, Relace, its CEO and cofounder Preston Zhou told me. (Matrix Partners and Y Combinator, which put Relace into its 2023 accelerator batch, also participated.) 

The tools Relace has developed so far for coding agents are actually AI models themselves. The startup has developed a small model that can merge the edits that an AI coding agent makes to a piece of code back into a company’s main codebase without having to rewrite the surrounding chunks of code—an issue that today’s AI struggles with. 

It also has developed a model that identifies and surfaces files or lines of code that will be helpful to an AI coding agent as soon as the agent is tasked with a new job.