What kind of tool is most appropriate for removing debris from a file?

The appropriate tool for removing debris from a file is a file card. A file card is a specialized cleaning tool designed specifically for the maintenance of files, which are hand tools used for shaping and smoothing materials. The file card typically features bristles that can effectively dislodge and remove metal shavings, dust, or other particles that accumulate in the grooves of a file during use. This cleaning action is essential for maintaining the effectiveness and longevity of the file.

Other tools listed do not serve this specific purpose. For instance, a framing square is used for measuring and layout in carpentry, a glass cutter is designed for scoring glass, and a flaring tool is used in plumbing to create flared fittings on pipes. None of these tools would effectively clean a file or assist in keeping it in optimal working condition, making the file card the ideal choice for this task.