Many source code analysis tools in Python use specific comment formats for actions, but there’s no unified standard among them. This inconsistency creates confusion for developers who must remember different rules for each tool. The metacode library aims to solve this issue by providing a standard format for these comments, making it easier for developers to use and implement. The library defines a clear syntax for action comments, which includes three main components: a key (the tool name), an action (the specific command), and a list of arguments. For example, a mypy comment like `# type: ignore[error-code]` breaks down into a key of "type," an action of "ignore," and an argument of "error-code." This standard allows for various data types in arguments, including Python identifiers, numeric literals, and even AST nodes if needed. To implement this parser, developers can install the library via pip and use a straightforward function to extract and parse comments. The function returns a list of parsed comment objects based on the specified key, allowing developers to filter comments relevant to their tools. Additional features include case-insensitive key handling and support for multiple keys, enhancing the library's flexibility and usability. This organized approach streamlines the process of working with comments across different tools in the Python ecosystem.