Build with a coding agent

A coding agent can build a plugin in a folder of yours and load it into Composer, in a few minutes. Before you start:

1. Sign in to Composer Preview and keep it open. Only Composer Preview loads plugins from a dev server; composer.space loads only the plugins it ships with.
2. Open an empty folder in your agent. The plugin is its own project, and the agent sets it up there.

Then describe the plugin you want in the prompt below, or pick an example, and open it in your agent.

World clockSankey chartReceipts filterQR code canvas toolTournament bracket

PromptCreate a Composer plugin called World Clock. For each space it should keep a list of timezones, shown as a map with a pin for each above a row of ticking clocks, so the team can see everyone's local time.

Open in Claude CodeOpen in CodexOpen in CursorCopy prompt

The composer-plugin-dev skill tells the agent how to set up the project, which DXOS packages to use, and how to load the plugin into your Composer. The prompt installs it in the folder first, so you do not need to install anything.

When the agent hands off

The agent builds the plugin and starts a dev server for it. Then it asks you to load it:

1. In Composer Preview, open Settings, then Plugins.
2. Click Enable under Dev Server.
3. Allow the browser’s prompt to reach devices on your local network.
4. Work through the checklist the agent gives you, and tell it what you see.

The plugin loads from the agent’s dev server, so it is there only while the server runs. To keep it, Publishing a plugin puts it in your private registry.

To build one yourself instead, start with Create a plugin.