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What coding agents are and which to use

Learn the 3 kinds: terminal agents (Claude Code, Codex CLI) that read your whole project, run commands and edit files; IDE assistants (GitHub Copilot, Cursor, Windsurf, Google Antigravity) with autocomplete, chat and an agent mode inside the editor; cloud agents (Claude Code on the web, Copilot coding agent, Codex cloud) that work on a GitHub issue in the background and open a pull request. Most developers use one IDE tool and one agent.