For thirty years the developer's main tool has been built around files: an editor in the middle, a file tree on the left, a terminal at the bottom. Coding agents change what the day looks like. You spend less time typing code and more time handing out tasks, answering an agent's questions, and reading what it changed.
An agentic development environment (ADE) is a tool built around that work instead of around the editor. The term appeared in 2025, and a dozen tools now use it. Here's what it means in practice, and how to tell whether you need one.
The job has changed shape
Working with one agent in a terminal, the loop looks like this:
- Give it a task.
- Wait. Answer its questions, allow the commands it wants to run.
- Read what it changed, keep it or throw it away.
That loop fits in one terminal. The trouble starts when you run several at once, which is where the real gain is: while one agent writes tests, another fixes a bug and a third explores a refactor. Now you're juggling terminals, agents are editing the same files, and a session that stopped to ask you something sits idle in a tab you forgot about.
What an ADE does
Every tool in the category handles the same handful of problems:
- Several agents at once, visible together. Each task gets a session, and you can see every session's state, running, waiting for you, done, without switching windows.
- Work kept apart. Each session can get its own git worktree, a separate folder on its own branch, so one agent's edits never land in another's.
- You stay in control. Agents ask before running commands or editing files, as much as you choose, and you answer where you're already looking.
- Review before you keep. Each session's changes are shown as a diff, hunk by hunk, before anything is merged.
- Work that doesn't need you watching. Agents carry on while you do something else.
How it differs from what you have
From an IDE with an agent panel. VS Code, Cursor and JetBrains put an agent beside the editor: the editor stays at the centre and the agent works in the folder you have open. An ADE puts the agents at the centre, each in its own folder, whatever editor you use for the bits you still type.
From a vendor's own app. Claude Code Desktop runs Claude Code; the ChatGPT app runs Codex. An ADE that's not tied to a vendor can run several vendors' agents side by side, so you can use each where it suits you and compare them on the same task.
From agents in a terminal. The agents are the same programs. The ADE adds what's around them: the overview, worktrees, review, notifications, and often a background process so closing the window doesn't stop anything.
Do you need one?
Probably not if you run one agent at a time on one task. A terminal is fine, and the agent's own tools are enough.
Probably yes if any of these sound familiar:
- you regularly run two or more agents at once;
- you've had two agents edit the same file;
- you've come back to find an agent was waiting for you for half an hour;
- you use more than one vendor's agent;
- you want to follow or answer agents away from your desk.
Where to start
The category is young and moves fast. Open-source options include Orca and Emdash; Claude Code Desktop and the ChatGPT app cover their own vendor's agent; Conductor and Paradev are Mac-first.
I build one too, Moontors: free, on macOS, Windows and Linux, running Claude Code, Codex, Gemini CLI and Grok Build side by side on one board, with Android and iPhone apps to answer them away from your desk, and no Moontors account needed. Its own explainer goes deeper on the definition: What is an agentic development environment?
Whichever you pick, the shift is the same: your job is less "write the code" and more "run the team that writes it". It's worth having a tool built for that job.
AI did the writing, I did the reading, and we both took credit.
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