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As coding agents move from novelty to daily driver, the editor around them matters more. Zenbu, a Y Combinator Spring 2026 project, is an extensible IDE built specifically for orchestrating coding agents rather than bolting them onto a traditional editor.

## What Zenbu does

The pitch is that you shape Zenbu around exactly how you and your team work, instead of adapting to a fixed layout. It is an environment for managing and coordinating multiple coding agents — running them, steering them, and fitting them into your own workflow rather than a vendor’s. That orchestration focus is the difference from a standard IDE with an AI sidebar: agents are first-class, and the editor is built to direct several of them at once.

## Open and extensible

Zenbu is categorized as AI, developer tools, and open source, and “extensible” is the operative word. Teams can adapt it to their conventions and toolchains rather than accept defaults, which matters when every team runs agents differently. Founded by Rob Pruzan, it lands in a market where Cursor and Claude Code dominate single-agent coding, but where coordinating a fleet of agents is still an open problem.