Cosine

Cosine is an AI-powered engineering assistant that uses multi-agent reasoning to mirror how human software engineers work. It is designed to plug into an engineering team’s existing stack—such as GitHub, Jira, Linear, Slack, and other workflow tools—and take on real development tasks rather than just answer chat-style questions. Cosine can understand tickets and specs, explore existing codebases, propose implementation plans, write and modify code, and open pull requests with explanations and context.

It operates asynchronously, allowing engineers to offload routine or time-consuming work while retaining full review and control. The system leverages multiple specialized agents that can coordinate on tasks like debugging, refactoring, writing tests, and updating documentation.