# GroundTruth Tools GroundTruth Tools is a collaborative data annotation tool for data preparation of machine learning. It supports multiple common annotation types and multi-user collaborative annotation. Quick start of annotation tasks, it is suitable for small teams to quickly produce data needed for cold start. GroundTruth Tools supports 2D BOX, Classification, 2D POLYGON, 2D POLYLINE, and 2D Keypoint. --- # Agent Instructions: 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: ``` GET https://docs.graviti.com/apps/groundtruth-tools.md?ask= ``` The question should be specific, self-contained, and written in natural language. 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.