Aider is a Python-based CLI tool that interfaces with LLM APIs (OpenAI, Anthropic, DeepSeek, Ollama, and many more via LiteLLM) to perform code edits directly on your local file system. It builds a repo map of your codebase using tree-sitter-powered symbol extraction, giving the LLM precise structural context even in large, multi-file projects. Every code change Aider makes is automatically committed to Git with a generated commit message, making changes easily auditable and reversible. It also supports linting and test-suite hooks so the model can self-correct after introducing regressions.