Developer debug bar for Magento 2, with findings and an MCP server
A debug bar for Magento 2 built for developers and for coding agents.
Every request writes one bounded, redacted JSON profile. The bar in the page is a viewer over that profile, so AJAX, GraphQL and REST requests are captured too even though nothing can be injected into them. The same profiles are served read only over MCP, so an agent inspects exact data instead of guessing from a screenshot.
[preview-overview]: ./assets/overview.webp "The inspector open on a Hyva checkout, showing the request as stages"
1.1.1. Verified against a running store: 202 unit tests, 67 for the bar's own JavaScript, 16 driving it in a browser, and a 30 assertion smoke suite across all four areas.
PHP 8.3 or 8.4 Magento 2.4. Developed and verified against 2.4.8 and 2.4.9 Any deploy mode. Outside developer mode it needs an access key, and without one it stays off. No frontend requirement. It renders in a shadow root with its own bundled Alpine, so it works on Hyvä and on Luma alike. The Alpine and Magewire sections read whatever the page has; a store with neither simply does not see them.
--dev on purpose. The module is a development tool, and a production build should not carry the plugins it registers.
Settings live under Stores Configuration Siteation Debug Bar, beside the other Siteation modules.
[preview-admin]: ./assets/admin-configuration.webp "The module's settings in the Magento admin, with the collapsed bar at the foot of the page"
From the project README.
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