Creating a custom post type (CPT) in WordPress can significantly enhance your website by allowing you to manage content more efficiently. However, remembering to update or check your custom post types can be a challenge. In this scenario, implementing a custom reminder widget specifically for your CPT archives can be incredibly helpful.

The first step in building such a plugin is to define your custom post type. This involves using the register_post_type() function within your plugin’s files. After setting up your CPT, you’ll need to create a widget that serves as a reminder. This widget could display upcoming posts that need reviewing or deadlines associated with these custom posts.

To develop the widget, you can use the WordPress Widget API. This API allows for easy creation of widget areas in your theme where users can drag and drop your custom widgets. The reminder widget can be programmed to pull data from your CPT based on certain parameters, such as publish date, to remind administrators of upcoming tasks.

An example plugin that offers similar functionalities and can serve as a good reference is the Post Types Order plugin, although it primarily focuses on reordering post types. By examining its structure, you can get a feel for how to interact with custom post types programmatically.

Without extending too much on code specifics in this short guide, the idea of this widget is to alert you by showing reminders directly in the dashboard, ensuring you never miss an update. For more technical implementation, referring to the WordPress Codex on Creating Custom Widgets can offer deeper insights.