# Function ## Description Create a new function or edit its attributes. You can specify function boundaries using the anchor (see `Anchor` action). If you don't specify any, IDA will try to find the boundaries automatically: * function start point is equal to the current cursor position; * function end point is calculated by IDA. A function cannot contain references to undefined instructions. If a function has already been defined at the specified addresses, IDA will jump to its start address, showing you a warning message. A function must start with an instruction. --- # 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.hex-rays.com/ida-actions/function.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.