How does Replit agent harness distinguish itself from standard code completion autocomplete plugins?

Autocomplete simply predicts the next three tokens in your active text editor. An autonomous development agent reads your entire codebase, identifies missing dependencies, and plans multi-step file modifications. It executes terminal commands, installs libraries, runs test suites, and debugs runtime errors autonomously. The agent functions as a tireless junior engineer working alongside the user, rather than a passive predictive keyboard.