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Yardmaster Guide

Build and test Chrome extensions with an agent

When your project is a Chrome extension, the agent can load it into a real Chrome, click through it, take screenshots and fix what breaks, without you testing by hand.

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When a session works on a Chrome extension, this feature lets the agent test its own work: it loads the extension into a real Chrome, opens the popup, takes screenshots, reads errors and reloads after each change.

This feature is in Preview: it is still in development and off until you turn it on.

Chrome extension dev (Autopilot)Settings, Lab · Default: OffWhen your project is a Chrome extension, gives the agent the agent-browser CLI workflow to autonomously load, drive, screenshot and reload the extension in a real Chrome, building and testing it without you clicking around. Includes a guided "Build a Chrome Extension" mission.Open in YardmasterOpens Yardmaster. Don't have it? Download

Turn it on#

  1. Open Settings > Lab and turn on Chrome extension dev (Autopilot).

  2. Open Agent Tools > CLI Tools, find agent-browser and click Install. It also downloads a separate test copy of Chrome.

  3. Open your extension's project and start a session as usual.

From then on, any session in a project with a Chrome extension manifest.json gets the testing steps added to its instructions.

Keep your extensions in one place#

Developer Tools > Extensions in the sidebar opens the Chrome Extensions hub. It lists your extension projects, each marked Tested (the agent has tested it) or Draft, with three buttons:

  • Open switches to the project.

  • Test it starts a session that tests the extension (it asks first).

  • Install in Chrome shows you how to load it into your own Chrome. It works only after a successful test.

Click New Extension to start a guided mission that sets up a new extension and hands it to a session that builds and tests it. Right-click a row to Rename or Remove it from the hub.

Install it in your own Chrome#

Yardmaster never installs an extension into your Chrome for you; Chrome requires you to do that. Install in Chrome walks you through it: click Reveal folder, open chrome://extensions in Chrome, turn on Developer mode (top right), then click Load unpacked and pick that folder.

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