Chatwork 全員に返信 is a Chrome extension designed to enhance the messaging experience on Chatwork by adding a 'Reply All' action. This tool simplifies the process of replying to messages by automatically extracting the original recipients and the sender's information, allowing users to quickly format and insert these details into the reply box. The extension maintains the standard reply tag format used by Chatwork, ensuring consistency in messaging.

Key features include the ability to extract the 'To' recipients from the original message, add the sender to the reply list, and exclude the user's own account ID from the recipients. It also eliminates duplicate recipients, enhancing the clarity of replies. Users simply need to set their account ID in the options, hover over a message, and click '全員に返信' to utilize this efficient tool.