> For the complete documentation index, see [llms.txt](https://documentation.checksheet.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://documentation.checksheet.app/concepts/checks.md). # Checks Everything in Check Sheet is based upon "checks", a check will monitor your spreadsheet for changes in the background and send you notifications if a certain condition is met. You can create several checks and we will evaluate the state of your checks whenever: * Your spreadsheet is updated * A form that is linked to your spreadsheet is submitted * Approximately once per hour When creating a check you specify the range of cells that you want to monitor which can be a single cell such as `A1`or an entire column such as \`B:B\`. In addition to the range you also specify a "condition" that we will evaluate against each of the cells in your range such as is the value equal to the text "Done" or is it greater than 5. If a cell in your monitored range is modified and matches your condition it may trigger a notification to be sent. Check Sheet will remember the positions of the cells in your spreadsheet that match the condition of your check so you won't be sent a notification more than once about the same cell. When configuring the [notifications](/concepts/notifications.md) for your check you can choose whether you want to be sent a notification every time a new value is found to match your condition or just the first time only. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://documentation.checksheet.app/concepts/checks.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.