Cosine is revolutionizing the way developers interact with their codebase. Acting as an AI-powered co-developer, Cosine is designed to assist programmers by providing immediate, context-aware answers to questions about their code. This tool is not just a simple language model interface; it combines extensive heuristics such as static analysis and semantic search to deliver fully contextual insights. Whether developers seek to locate implementation of features, plan new functionality, or decode complex parts of the code, Cosine steps in to help by understanding the codebase on an intricate level. With features like indexing, semantic search, tagging, and relationship graph creation, Cosine facilitates smoother navigation and understanding of large and intricate codebases. Supported by Y Combinator, this cutting-edge tool is available for VS Code and can also be accessed from the Open VSX Registry, promising a new era of coding efficiency and knowledge transfer.