Cursor 0.40: Composer multi-file editing and Agent mode reshape the IDE
In one sentence Cursor introduces Composer for coordinated edits across multiple files and Agent mode for autonomous tasks on the entire codebase: the first IDE to unify editing, chat, and execution in a continuous loop.
Cursor 0.40 brings two features that redefine what a modern IDE can do. Composer lets you describe a change and see it applied simultaneously across dozens of different files, maintaining consistency across all modifications. Agent mode goes further: the AI reads the codebase, plans the steps, runs commands in the terminal, verifies results, and iterates until the task is complete. This is no longer an editor with suggestions: it is an environment where the developer guides and the AI executes. Within months, Cursor became the tool of choice for the most advanced developers.
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