Aider is a CLI tool that lets a developer have an AI collaborate on code changes in an interactive session. It edits files, runs tests, and commits changes directly. It is fast, model-agnostic, and works well for developers who prefer the terminal over an IDE-based AI assistant.
Fleet does not replace the coding experience. It coordinates the workflow around coding: assigning work to Claude Code agents, triggering them from GitHub events, routing PRs to reviewer agents, and handing off to a release-manager.