The text explores various tools for testing and linting English prose, emphasizing their importance in maintaining high-quality software documentation. Key tools discussed include markdownlint for formatting, mdspell for spell-checking, and Vale for comprehensive style guide enforcement, each with differing features and ease of use. The "Docs as Code" movement is highlighted, advocating for the use of linting and testing techniques typically applied to code for documentation as well. Vale is noted for its flexibility and ability to enforce custom style guides, making it a preferred choice for those willing to invest time in setup. The integration of these tools into continuous integration (CI) processes is recommended to automate error detection and improve documentation quality. The text also briefly mentions Earthly as a platform that utilizes Vale and markdownlint to enhance build processes by ensuring consistent and error-free documentation.